Articles de revues : « Optoelectronic properties of nanoparticles »

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Sakurai, Makoto, Ke Wei Liu, Romain Ceolato et Masakazu Aono. « Optical Properties of ZnO Nanowires Decorated with Au Nanoparticles ». Key Engineering Materials 547 (avril 2013) : 7–10. http://dx.doi.org/10.4028/www.scientific.net/kem.547.7.

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One of the key technologies in future optoelectronics is control of excitons in oxide materials by the coupling with plasmons on noble metal surfaces. Optical properties of ZnO nanowires decorated with Au nanoparticles were studied to understand fundamental mechanism of the coupling and to develop optoelectronic devices with new functionalities. Light intensity at the main peak position in the photoluminescence (PL) spectra of ZnO nanowires was enhanced with the coverage of Au nanoparticles. Lifetime of excitons excited optically decreased by the decoration of Au nanoparticles. Understanding of the coupling between excitons and plasmons leads to optical control of excitons and will pave the way for new type of optoelectronic devices.

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Riyadh, Shahad, Mohammed Salman Mohammad et Noorulhuda Riyadh Naser. « Optical Properties of Germanium Nanoparticles Prepared by Laser Ablation ». University of Thi-Qar Journal of Science 10, n^o 2 (26 décembre 2023) : 137–40. http://dx.doi.org/10.32792/utq/utjsci/v10i2.1119.

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The synthesis of germanium nanoparticles (Ge NPs) through pulsed laser ablation in deionized water is investigated for Nanophotonics and optoelectronic applications. This study delves into the influence of laser pulse energy on Ge NP properties, specifically highlighting size control and optical characteristics. Our findings reveal a significant reduction in Ge NP size, from an initial 30 nm to 20 nm, as the laser pulse energy increases. Notably, we observed size-dependent blue luminescence from the synthesized Ge NPs. This controlled synthesis holds promise for optoelectronics and sensing applications. The study provides valuable insights into precise Ge NP synthesis and underscores their intriguing optical properties, paving the way for advanced Nanophotonic devices.

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Lee, Chang-Woo, Ki-Woo Lee et Jai-Sung Lee. « Optoelectronic properties of β-Fe2O3 hollow nanoparticles ». Materials Letters 62, n^o 17-18 (juin 2008) : 2664–66. http://dx.doi.org/10.1016/j.matlet.2008.01.008.

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MA, DONGLING, et ARNOLD KELL. « HOLLOW, BRANCHED AND MULTIFUNCTIONAL NANOPARTICLES : SYNTHESIS, PROPERTIES AND APPLICATIONS ». International Journal of Nanoscience 08, n^o 06 (décembre 2009) : 483–514. http://dx.doi.org/10.1142/s0219581x09006419.

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Nanoscale materials with various structures have attracted extensive research interest during the past decade. Among them, hollow, branched and multifunctional nanoparticles comprised of two different nanoparticle components are emerging as new classes of interesting nanomaterials owing to the unique optical, catalytic, electrical, magnetic and mechanical properties associated with their unusual morphologies as well as their potential wide range of applications in various fields such as photothermal therapy, diagnosis, drug delivery, catalysis, optoelectronic, electronics and biodiagnostics. In particular, branched nanoparticles promise to serve as building blocks for more complex materials and advanced devices through self-assembly and self-alignment and heterodimeric nanoparticles show promise for the development of tunable magnetic materials and multimodal biodiagnostic imaging tools.

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Qureshi, Akbar Ali, Sofia Javed, Hafiz Muhammad Asif Javed, Muhammad Jamshaid, Usman Ali et Muhammad Aftab Akram. « Systematic Investigation of Structural, Morphological, Thermal, Optoelectronic, and Magnetic Properties of High-Purity Hematite/Magnetite Nanoparticles for Optoelectronics ». Nanomaterials 12, n^o 10 (11 mai 2022) : 1635. http://dx.doi.org/10.3390/nano12101635.

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Iron oxide nanoparticles, especially hematite (α-Fe2O3) and magnetite (Fe3O4) have attained substantial research interest in various applications of green and sustainable energy harnessing owing to their exceptional opto-magneto-electrical characteristics and non-toxicity. In this study, we synthesized high-purity hematite and magnetite nanoparticles from a facile top-down approach by employing a high-energy ball mill followed by ultrasonication. A systematic investigation was then carried out to explore the structural, morphological, thermal, optoelectrical, and magnetic properties of the synthesized samples. The experimental results from scanning electron microscopy and X-ray diffraction corroborated the formation of highly crystalline hematite and magnetite nanoparticles with average sizes of ~80 nm and ~50 nm, respectively. Thermogravimetric analysis revealed remarkable results on the thermal stability of the newly synthesized samples. The optical studies confirmed the formation of a single-phase compound with the bandgaps dependent on the size of the nanoparticles. The electrochemical studies that utilized cyclic voltammetry and electrochemical impedance spectroscopy techniques verified these iron oxide nanoparticles as electroactive species which can enhance the charge transfer process with high mobility. The hysteresis curves of the samples revealed the paramagnetic behavior of the samples with high values of coercivity. Thus, these optimized materials can be recommended for use in future optoelectronic devices and can prove to be potential candidates in the advanced research of new optoelectronic materials for improved energy devices.

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Agrahari, Vivek, Mohan Chandra Mathpal, Mahendra Kumar et Arvind Agarwal. « Investigations of optoelectronic properties in DMS SnO2 nanoparticles ». Journal of Alloys and Compounds 622 (février 2015) : 48–53. http://dx.doi.org/10.1016/j.jallcom.2014.10.009.

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Sathyaseela, Balaraman. « Ce Doped SnO2 Nanoparticcles : Investigation of Structural and Optical Properties ». Nanomedicine & ; Nanotechnology Open Access 9, n^o 1 (2024) : 1–7. http://dx.doi.org/10.23880/nnoa-16000282.

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Tin oxide (SnO2 ) and (1 wt%, 3 wt%, 5wt %) Ce-doped SnO2 nanoparticles were synthesized by the Co-precipitation method. X-ray diffraction investigations have been confirmed that the synthesized nanoparticles are polycrystalline in nature with tetragonal rutile phase. The particle size is determined using Scherrer’s formula and it is found to increase with the “Ce” dopant. High resolution scanning electron microscope (HRSEM) and transmission electron microscopy (TEM) analysis showed spherical morphology composed of fine crystallites with diameters around ∼200 nm. Optical band gap was decreased by the doping confirming the direct energy transfer between f-electrons of rare earth ion and the SnO2 conduction or valence band. This study demonstrates the Ce doped SnO2 nanoparticles for applications in optoelectronic devices.

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Li, Dikun, Hua Lu, Yangwu Li, Shouhao Shi, Zengji Yue et Jianlin Zhao. « Plasmon-enhanced photoluminescence from MoS₂ monolayer with topological insulator nanoparticle ». Nanophotonics 11, n^o 5 (21 janvier 2022) : 995–1001. http://dx.doi.org/10.1515/nanoph-2021-0685.

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Abstract Topological insulators (TI), as a kind of fantastic nanomaterial with excellent electrical and optical properties, have attracted particular attention due to the promising applications in optoelectronic devices. Herein, we experimentally demonstrated the interaction between light and molybdenum disulfide (MoS2) monolayer with an antimony telluride (Sb2Te3) TI nanoparticle. It was found that photoluminescence (PL) emission and Raman scattering signal can be boosted by 5 and 8 folds in MoS2 monolayer integrated with the TI nanoparticle, respectively. The measured and simulated dark-field scattering spectra illustrated that the enhancement of light–matter interaction could be derived from the generation of localized surface plasmons on the TI nanoparticle with distinctly boosted electric field. We also found that there exists a redshift of 5 nm for the enhanced PL peak, which could be attributed to the formation of trions in MoS2 induced by plasmon doping. This work would provide a new pathway for the applications of TI nanoparticles in the optoelectronics, especially light–matter interaction enhancement.

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Liao, Jianhui, Sander Blok, Sense Jan van der Molen, Sandra Diefenbach, Alexander W. Holleitner, Christian Schönenberger, Anton Vladyka et Michel Calame. « Ordered nanoparticle arrays interconnected by molecular linkers : electronic and optoelectronic properties ». Chemical Society Reviews 44, n^o 4 (2015) : 999–1014. http://dx.doi.org/10.1039/c4cs00225c.

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KHASHAN, KHAWLA S. « OPTOELECTRONIC PROPERTIES OF ZnO NANOPARTICLES DEPOSITION ON POROUS SILICON ». International Journal of Modern Physics B 25, n^o 02 (20 janvier 2011) : 277–82. http://dx.doi.org/10.1142/s0217979211054744.

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In this work, a colloid of nanocrystalline ZnO particles was prepared by chemical method, and sprayed on porous silicon (PS) substrate which was prepared by electrochemical etching under a current density of 15 mA/cm2 for 10 min. The initial radius of the ZnO particles was found to be (2.2 nm). FTIR spectra exhibit the presence of Zn – O bond which indicates the formation of ZnO particles. Also spectra reveals the formation of SiH x(x = 1–2) and Si – O bond which indicates the presence of porous layer. High-performance rectification was obtained, with high photoresponsivity of 0.54 A/W at 400 nm. The corresponding quantum efficiency was 166.7%. The results show that ZnO on PS structures act as good candidates for making highly efficient photodiodes.

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Charipar, Kristin, Heungsoo Kim, Alberto Piqué et Nicholas Charipar. « ZnO Nanoparticle/Graphene Hybrid Photodetectors via Laser Fragmentation in Liquid ». Nanomaterials 10, n^o 9 (21 août 2020) : 1648. http://dx.doi.org/10.3390/nano10091648.

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By combining the enhanced photosensitive properties of zinc oxide nanoparticles and the excellent transport characteristics of graphene, UV-sensitive, solar-blind hybrid optoelectronic devices have been demonstrated. These hybrid devices offer high responsivity and gain, making them well suited for photodetector applications. Here, we report a hybrid ZnO nanoparticle/graphene phototransistor that exhibits a responsivity up to 4 × 104 AW−1 and gain of up to 1.3 × 105 with high UV wavelength selectivity. ZnO nanoparticles were synthesized by pulsed laser fragmentation in liquid to attain a simple, efficient, ligand-free method for nanoparticle fabrication. By combining simple fabrication processes with a promising device architecture, highly sensitive ZnO nanoparticle/graphene UV photodetectors were successfully demonstrated.

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R, ASWINI, et S. Kothai. « ELECTRICAL PROPERTIES ON COPOLYESTER INCORPORATED IN A POLYMER NANOCOMPOSITE MATRIX - A STUDY ». Suranaree Journal of Science and Technology 30, n^o 4 (11 octobre 2023) : 010245(1–7). http://dx.doi.org/10.55766/sujst-2023-04-e0875.

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This study aims at the application of the prepared Polymer Nanocomposite in the field of solid-state optoelectronic devices. Polymer Nanocomposite was prepared by incorporating iron nanoparticles, synthesized random Copolyester (BCTP), and Polypyrrole by Insitu chemical polymerization method. The application of the synthesized random Copolyester with wide biological activity due to bis chalcone moiety can also be extended to the optoelectronics field. The Copolyester (BCTP) was subjected to spectral analysis such as Fourier Transform Infrared Spectroscopy (FTIR) to confirm the chemical structural orientation. The Iron nanoparticles, Polypyrrole, and polymer nanocomposite were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and powder X-ray Diffraction (PXRD). The FTIR spectroscopy confirms the formation of polymer nanocomposite by the prominent shift in stretching frequency from the starting materials taken. Powder X-ray Diffraction was used to determine the Iron Nanoparticles’ average crystallite size. The structural morphology of iron nanoparticles, Polypyrrole, and polymer nanocomposite were identified by Scanning electron Microscopy. The SEM images gave the view of Iron nanoparticles, Polypyrrole was seated in the Polymer matrix. The specific capacitance for the newly synthesized Polymer Nanocomposite was found to be 58.88 F/g by Cyclic Voltammetric analysis. The electrochemical behavior of the random copolyester (BCPT), Iron nanoparticles, Polypyrrole, and polymer nanocomposite was carried out by Impedance analysis. This confirms the Polymer Nanocomposites were conducting nature with good ionic conductance of 6.89 × 10-5 S cm-1.

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Elafandi, Salah, Zabihollah Ahmadi, Nurul Azam et Masoud Mahjouri-Samani. « Gas-Phase Formation of Highly Luminescent 2D GaSe Nanoparticle Ensembles in a Nonequilibrium Laser Ablation Process ». Nanomaterials 10, n^o 5 (8 mai 2020) : 908. http://dx.doi.org/10.3390/nano10050908.

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Interest in layered two-dimensional (2D) materials has been escalating rapidly over the past few decades due to their promising optoelectronic and photonic properties emerging from their atomically thin 2D structural confinements. When these 2D materials are further confined in lateral dimensions toward zero-dimensional (0D) structures, 2D nanoparticles and quantum dots with new properties can be formed. Here, we report a nonequilibrium gas-phase synthesis method for the stoichiometric formation of gallium selenide (GaSe) nanoparticles ensembles that can potentially serve as quantum dots. We show that the laser ablation of a target in an argon background gas condenses the laser-generated plume, resulting in the formation of metastable nanoparticles in the gas phase. The deposition of these nanoparticles onto the substrate results in the formation of nanoparticle ensembles, which are then post-processed to crystallize or sinter the nanoparticles. The effects of background gas pressures, in addition to crystallization/sintering temperatures, are systematically studied. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, and time-correlated single-photon counting (TCSPC) measurements are used to study the correlations between growth parameters, morphology, and optical properties of the fabricated 2D nanoparticle ensembles.

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Onu, Chiamaka Peace, Azubike Josiah Ekpunobi, Chiedozie Emmanuel Okafor et Lynda Adaora Ozobialu. « Optical Properties of Monazite Nanoparticles Prepared Via Ball Milling ». Asian Journal of Research and Reviews in Physics 7, n^o 4 (22 septembre 2023) : 17–29. http://dx.doi.org/10.9734/ajr2p/2023/v7i4146.

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This research work focused on the preparation of Monazite nanoparticles using ball milling technique and the determination of its optical properties. High energy ball milling was used to prepare nanoparticles from the bulk materials using the top-down technique. Debye–Scherer formula was used to determine the crystalline size of the nanoparticle. Optical properties such as transmittance, refractive index, extinction coefficient, optical conductivity and band gap energy were determined. The result showed that the crystalline size was about 64.23nm on the average. The dislocation density calculated ranged from 0.149 x 10-3nm to 0.460 x 10-3nm. The absorbance decreased as the wavelength spectrum moved from the ultraviolet region to the visible region and the near-infrared region. The refractive index increased from 1.57 a.u to 2.65 a.u as the photon energy increased from about 1.38eV to 1.14eV. The transmittance at the near-infrared region was even up to 90.9% in some cases. The band energy gap was between 3.57eV and 4.11eV. The properties of the Monazite nanoparticles determined showed that it can have possible applications in optoelectronic and photovoltaic devices.

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Voeikova, T. A., O. A. Zhuravleva, V. S. Kuligin, E. V. Ivanov, E. I. Kozhukhova, A. S. Egorov, E. A. Chigorina, B. M. Bolotin et V. G. Debabov. « Production of polymeric nanocomposites by nature-like method and study of their physical and chemical properties ». Voprosy Materialovedeniya, n^o 4(100) (20 mars 2020) : 113–23. http://dx.doi.org/10.22349/1994-6716-2019-100-4-113-123.

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At the NRC “Kurchatov Institute” – GOSNIIGENETIKA, NpCdS nanocrystals were obtained by microbial synthesis. They were stabilized with proteins, which composition is determined by the strain used for biosynthesis of nanoparticles. Biogenic nanoparticles were studied and described by size, shape, hydrodynamic diameter, ζ potential, luminescence level, and defined as quantum dots applying methods of electron microscopy, dynamic light scattering, and spectrofluorimetry. The influence of temperature, pressure and solvents on the stability of biogenic nanoparticles and the luminescence intensity was evaluated in collaboration with IREA (NRC “Kurchatov Institute”). The luminescence intensity of the aqueous suspension of NpCdS was determined depending on the range of nanoparticle concentrations. The possibility of introducing and identifying NpCdS in epoxy resin, polyimide, and polyvinyl alcohol was assessed. Polymer nanocomposites are used for optoelectronic, biomedical and agricultural applications.

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Nevers, Douglas R., Curtis B. Williamson, Tobias Hanrath et Richard D. Robinson. « Surface chemistry of cadmium sulfide magic-sized clusters : a window into ligand-nanoparticle interactions ». Chemical Communications 53, n^o 19 (2017) : 2866–69. http://dx.doi.org/10.1039/c6cc09549f.

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Thomas, K. George, Binil Itty Ipe et P. K. Sudeep. « Photochemistry of chromophore-functionalized gold nanoparticles ». Pure and Applied Chemistry 74, n^o 9 (1 janvier 2002) : 1731–38. http://dx.doi.org/10.1351/pac200274091731.

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It is generally believed that metal nanoparticles strongly quench the singlet-excited states of chromophores when attached to nanoparticle surfaces, through an energy-transfer mechanism, which limits their application in optoelectronic devices and photonic materials. Recent studies of fluorophore-linked metal nanoparticles reveal that there is a dramatic suppression in the quenching of the singlet-excited state of these molecules and they possess unusual photophysical properties. A summary of our work on the photophysical and excited-state properties of chromophore-functionalized gold nanoparticles is presented in this article. Pyrene-capped gold nanoparticles showed normal fluorescence in nonpolar solvents and an intermolecular excimer formation at higher loadings. The quenching of the emission, observed in pyrene-labeled gold nanoparticles in polar solvents, is attributed to the formation of pyrene radical cation through a photoinduced electron-transfer process. We have also functionalized gold nanoparticles using a thiol derivative of fullerene. The quenching of fluorescence and decreased yields of triplet-excited state, observed in these systems, are attributed to an energy-transfer process.

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Schmitt, Paul, Pallabi Paul, Weiwei Li, Zilong Wang, Christin David, Navid Daryakar, Kevin Hanemann et al. « Linear and Nonlinear Optical Properties of Iridium Nanoparticles Grown via Atomic Layer Deposition ». Coatings 13, n^o 4 (18 avril 2023) : 787. http://dx.doi.org/10.3390/coatings13040787.

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Nonlinear optical phenomena enable novel photonic and optoelectronic applications. Especially, metallic nanoparticles and thin films with nonlinear optical properties offer the potential for micro-optical system integration. For this purpose, new nonlinear materials need to be continuously identified, investigated, and utilized for nonlinear optical applications. While noble-metal nanoparticles, nanostructures, and thin films of silver and gold have been widely studied, iridium (Ir) nanoparticles and ultrathin films have not been investigated for nonlinear optical applications yet. Here, we present a combined theoretical and experimental study on the linear and nonlinear optical properties of iridium nanoparticles deposited via atomic layer deposition (ALD). Linear optical constants, such as the effective refractive index and extinction coefficient, were evaluated at different growth stages of nanoparticle formation. Both linear and nonlinear optical properties of these Ir ALD coatings were calculated theoretically using the Maxwell Garnett theory. The third-order susceptibility of iridium nanoparticle samples was experimentally investigated using the z-scan technique. According to the experiment, for an Ir ALD coating with 45 cycles resulting in iridium nanoparticles, the experimentally determined nonlinear third-order susceptibility is about χIr(3) = (2.4 − i2.1) × 10−17 m2/V2 at the fundamental wavelength of 700 nm. The theory fitted to the experimental results predicts a 5 × 106-fold increase around 230 nm. This strong increase is due to the proximity to the Mie resonance of iridium nanoparticles.

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Alay, P., Y. Enns, A. Kazakin, A. Mizerov, E. Nikitina, A. Kondrateva, E. Vyacheslavova, P. Karaseov et M. Mishin. « Optical properties of plasmonic metal nanoparticles on GaN surface ». Journal of Physics : Conference Series 2086, n^o 1 (1 décembre 2021) : 012127. http://dx.doi.org/10.1088/1742-6596/2086/1/012127.

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Abstract Effect of the plasmonic resonant absorption in metal nanoparticles formed on the GaN surface on optical properties of samples is studied. Silver and gold nanoparticles are formed by solid-state dewetting on epitaxial GaN grown by molecular beam epitaxy (MBE) on c-sapphire substrate. Theoretical and experimental optical characteristics show the appearance characteristic absorption of the surface plasmon resonance. The results of the work show the possibility of increasing the efficiency of GaN-based optoelectronic devices.

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Pérez-Jiménez, Limny Esther, Juan Carlos Solis-Cortazar, Lizeth Rojas-Blanco, Germán Perez-Hernandez, Omar S. Martinez, Roger C. Palomera, F. Paraguay-Delgado, I. Zamudio-Torres et Erik R. Morales. « Enhancement of optoelectronic properties of TiO2 films containing Pt nanoparticles ». Results in Physics 12 (mars 2019) : 1680–85. http://dx.doi.org/10.1016/j.rinp.2019.01.046.

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Sharma, Bindu, et M. K. Rabinal. « Ambient synthesis and optoelectronic properties of copper iodide semiconductor nanoparticles ». Journal of Alloys and Compounds 556 (avril 2013) : 198–202. http://dx.doi.org/10.1016/j.jallcom.2012.12.120.

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Marino, Emanuele, Oleg A. Vasilyev, Bas B. Kluft, Milo J. B. Stroink, Svyatoslav Kondrat et Peter Schall. « Controlled deposition of nanoparticles with critical Casimir forces ». Nanoscale Horizons 6, n^o 9 (2021) : 751–58. http://dx.doi.org/10.1039/d0nh00670j.

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Nanocrystal assembly represents the key step to develop next-generation optoelectronic devices with properties defined from the bottom-up. In this paper, we show that the critical Casimir effect allows direct control over superstructure morphology.

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NAJM, A. S., M. S. CHOWDHURY, F. T. MUNNA, P. CHELVANATHAN, V. SELVANATHAN, M. AMINUZZAMAN, K. TECHATO, N. AMIN et MD AKHTARUZZAMAN. « IMPACT OF CADMIUM SALT CONCENTRATION ON CdS NANOPARTICLES SYNTHESIZED BY CHEMICAL PRECIPITATION METHOD ». Chalcogenide Letters 17, n^o 11 (novembre 2020) : 537–47. http://dx.doi.org/10.15251/cl.2020.1711.537.

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In this study, cadmium sulfide (CdS) nanoparticles (NPs) were synthesized via chemical precipitation, a facile and cost effective method. The effects of various cadmium salt concentration on the characteristics of CdS NPs has been analyzed to understand the structure properties relationship for optoelectronics applications. XRD, FESEM, Raman Spectra, and UV–Vis has been used to characterize the prepared samples. The optical measurement indicates that there is a direct transition in accordance to energy band gap among 2.36 as well as 2.4 eV. The XRD diffract grams verify that all the films deposited have been polycrystalline of cubic as well as hexagonal structure with superior orientation (111). Analysis of EDX displayed that certain films have been stoichiometric with a small deficiency in sulphur. By optimizing the molar concentration of cadmium ions, the optoelectronic properties of the CdS NPs can be tuned accordingly.

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Lee, Sang, et Bong-Hyun Jun. « Silver Nanoparticles : Synthesis and Application for Nanomedicine ». International Journal of Molecular Sciences 20, n^o 4 (17 février 2019) : 865. http://dx.doi.org/10.3390/ijms20040865.

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Over the past few decades, metal nanoparticles less than 100 nm in diameter have made a substantial impact across diverse biomedical applications, such as diagnostic and medical devices, for personalized healthcare practice. In particular, silver nanoparticles (AgNPs) have great potential in a broad range of applications as antimicrobial agents, biomedical device coatings, drug-delivery carriers, imaging probes, and diagnostic and optoelectronic platforms, since they have discrete physical and optical properties and biochemical functionality tailored by diverse size- and shape-controlled AgNPs. In this review, we aimed to present major routes of synthesis of AgNPs, including physical, chemical, and biological synthesis processes, along with discrete physiochemical characteristics of AgNPs. We also discuss the underlying intricate molecular mechanisms behind their plasmonic properties on mono/bimetallic structures, potential cellular/microbial cytotoxicity, and optoelectronic property. Lastly, we conclude this review with a summary of current applications of AgNPs in nanoscience and nanomedicine and discuss their future perspectives in these areas.

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Shende, Pravin, et Adrita Mondal. « Nanobulges : A Duplex Nanosystem for Multidimensional Applications ». Current Nanoscience 16, n^o 5 (5 octobre 2020) : 668–75. http://dx.doi.org/10.2174/1573413716666200218130452.

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Background: Nanoparticulate systems like nanospheres, nanocrystals, and nanofluids show immense advancement in the fields of nanoelectronic and agriculture. Nanobulges are duplexed nanoparticles comprising the interaction of two nanoparticles for the formation of a curved bulge on the surface of the nanoparticle. Objective: This review focuses on properties, mechanism of action, methods of preparation and applications of nanobulges in optoelectronic devices and controlled release of fertilizers. Methods: Mostly pulsed laser deposition and multilayered palladium-catalysts fabrication with nanobulges structure are used to prepare nanobulges. Results: Nanobulges are advantageous over the conventional nanoparticles due to their high electrical density, improved catalytic drug loading and good electronic conductivity. Conclusion: In the near future, nanobulges will emerge as a promising material for commercial preparation of bioanalytical sensors and microfluidic systems.

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Fortin, Patrick, Subash Rajasekar, Pankaj Chowdhury et Steven Holdcroft. « Hydrogen evolution at conjugated polymer nanoparticle electrodes ». Canadian Journal of Chemistry 96, n^o 2 (février 2018) : 148–57. http://dx.doi.org/10.1139/cjc-2017-0329.

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Organic polymer nanoparticles have been gaining attention in photovoltaics as a means to control the morphology of polymer composite films for the purpose of studying bulk heterojunction, photoactive layers. This work investigates the preparation of nanostructured organic thin films from P3HT:PC61BM nanoparticles and their characterization as photoelectrodes for the photoelectrochemical reduction of hydrogen in acidic solutions. The morphology and optoelectronic properties of the nanostructured photocathodes are compared with conventional, solution-cast thin films of P3HT:PC61BM. The nanostructured photoelectrodes provide increased surface area compared with solution-cast films through control of the nanoscale morphology within each nanoparticle, leading to enhanced P3HT:PC61BM phase segregation. The photo-assisted deposition of platinum nanoparticles as hydrogen evolution reaction (HER) catalysts onto the nanostructured P3HT:PC61BM photocathodes facilitates the photoreduction of protons to H2.

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Alikhaidarova, E., E. Seliverstova et N. Ibrayev. « Effect of Silver Nanoparticles on the Optoelectronic Properties of Graphene Oxide Films ». Bulletin of the Karaganda University. "Physics" Series 109, n^o 2 (30 mars 2023) : 6–12. http://dx.doi.org/10.31489/2023ph1/6-12.

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The effect of Ag nanoparticles (NPs) on the optical and optoelectronic properties of films based on graphene oxide has been studied. In the presence of Ag NPs, the morphology, as well as the thickness of graphene oxide films, were not changed. When Ag NPs were added, a change in the shape and position of the absorption bands and Raman spectra of graphene oxide was observed. It is shown that with the addition of Ag NPs, the G band of graphene oxide shifts to low frequencies, which may be the result of the absence of separate double bonds, while the ID/IG ratio was not changed, as did the number of Gr layers. In the absorption spectrum of the films, along with the absorption band of graphene oxide, a shoulder was registered, which can be associated with the absorption of Ag NPs. The optical density of Gr films with plasmonic NPs is higher than without them. Measurements of the optoelectronic characteristics showed that, in the presence of Ag NPs, an increase in the values of the photocurrent of graphene oxide is observed. The sensitivity of graphene oxide films was increased by almost 20 times when plasmonic NPs were added to them, and the detection ability increased by 25 times. The results obtained can be used in the development of new photosensitive devices for optoelectronic and photocatalytic applications.

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Truong, Nguyen Tam Nguyen, Thao Phuong Ngoc Nguyen et Chinho Park. « Structural and Optoelectronic Properties of CdSe Tetrapod Nanocrystals for Bulk Heterojunction Solar Cell Applications ». International Journal of Photoenergy 2013 (2013) : 1–7. http://dx.doi.org/10.1155/2013/146582.

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Semiconducting CdSe tetrapod nanoparticles were prepared, and their structural and optical properties were examined. The surface capping molecule, octylphosphonic acid, was replaced with butylamine after the particle synthesis. The exchange of surface ligands changed the physical properties of the nanocrystals, which resulted in a slight decrease in the nanoparticles size. The effects of changing surface ligands of CdSe tetrapod nanocrystals on the structural and optoelectronic properties were investigated, and it was found that the surfactant of nanoparticles could affect the device performance by enhancing the charge carrier separation at the active layer interfaces. Power conversion efficiency of the bulk heterojunction solar cells having the structure of glass/ITO/PEDOT:PSS/(CdSe + PCPDTBT)/Al was improved from 1.21% to 1.52% with the use of ligand-exchanged nanoparticles.

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Pandey, Puran, Mao Sui, Ming-Yu Li, Quanzhen Zhang, Eun-Soo Kim et Jihoon Lee. « Shape transformation of self-assembled Au nanoparticles by the systematic control of deposition amount on sapphire (0001) ». RSC Advances 5, n^o 81 (2015) : 66212–20. http://dx.doi.org/10.1039/c5ra07631e.

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The shape and size dependent optical, physical and chemical properties of isotropic and anisotropic gold nanoparticles (Au NPs) have attracted significant research interest for their application in various optoelectronic devices.

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Fagadar-Cosma, Eugenia. « Porphyrins in Competition with their Nanomaterials Containing PtNPs and AuNPs. Synergism for the Benefit of Sensing Applications ». Proceedings 57, n^o 1 (9 novembre 2020) : 7. http://dx.doi.org/10.3390/proceedings2020057007.

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Due to their amazing optoelectronic properties, porphyrins have intrinsic sensing propertiesthat might be highly improved when they are associated with a proper partner, such as platinumnanoparticles PtNPs or gold nanoparticles AuNPs. [...]

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Atisme, Yu, Tseng, Chen, Hsu et Chen. « Interface Interactions in Conjugated Polymer Composite with Metal Oxide Nanoparticles ». Nanomaterials 9, n^o 11 (29 octobre 2019) : 1534. http://dx.doi.org/10.3390/nano9111534.

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This study presents the preparation, characterization, and properties of a new composite containing cerium oxide nanoparticles and a conjugated polymer. CeO2 nanoparticles prepared using the co-precipitation method were dispersed into the conjugated polymer, prepared using the palladium-catalyzed Suzuki–Miyaura cross-coupling reaction. The interface interactions between the two components and the resultant optoelectronic properties of the composite are demonstrated. According to transmission electron microscopy and X-ray absorption spectroscopy, the dispersion of CeO2 nanoparticles in the polymer matrix strongly depends on the CeO2 nanoparticle concentration and results in different degrees of charge transfer. The photo-induced charge transfer and recombination processes were studied using steady-state optical spectroscopy, which shows a significant fluorescence quenching and red shifting in the composite. The higher photo-activity of the composite as compared to the single components was observed and explained. Unexpected room temperature ferromagnetism was observed in both components and all composites, of which the origin was attributed to the topology and defects.

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Kayathri, J., N. RaniMeiyammai, S. Rani, K. P. Bhuvana, K. Palanivelu et S. K. Nayak. « Study on the Optoelectronic Properties of UV Luminescent Polymer : ZnO Nanoparticles Dispersed PANI ». Journal of Materials 2013 (27 février 2013) : 1–7. http://dx.doi.org/10.1155/2013/473217.

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The present work is focused on the synthesis and characterization of a new polymer thin film material suitable for emissive layer in polymer light-emitting diodes. Thin films of polyaniline and ZnO nanoparticles dispersed polyaniline have been prepared and investigated for the suitability of emissive layer in polymer light emitting diodes. ZnO nanoparticles have been synthesized using wet chemical method and characterized using powder X-ray diffraction. Diffraction pattern reveals that the ZnO nanoparticles are grown in hexagonal wurtzite structure with the preferential orientation of (001) plane. Polyaniline was synthesized using potassium persulphate (initiator) at room temperature. ZnO nanoparticles are then dispersed in different doping level (5%, 10%, 15% 20% and 50%) with polyaniline. Thin films of ZnO dispersed polyaniline (PANI/ZnO) were prepared and characterized using scanning electron microscopy in order to investigate the surface morphology of the film. The optical characteristics and the suitability of film as emissive layer were analyzed using UV-visible absorption and fluorescence spectroscopy.

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Willner, Itamar, et Bilha Willner. « Functional nanoparticle architectures for sensoric, optoelectronic, and bioelectronic applications ». Pure and Applied Chemistry 74, n^o 9 (1 janvier 2002) : 1773–83. http://dx.doi.org/10.1351/pac200274091773.

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Tailored sensoric, electronic, photoelectrochemical, and bioelectrocatalytic functions can be designed by organized molecular or biomolecular nanoparticle hybrid configurations on surfaces. Layered receptor-cross-linked Au nanoparticle assemblies on electrodes act as specific sensors of tunable sensitivities. Layered DNA-cross-linked CdS nanoparticles on electrode supports reveal organized assemblies of controlled electronic and photoelectrochemical properties. Au nanoparticle-FAD semisynthetic cofactor units are reconstituted into apo-glucose oxidase (GOx) and assembled onto electrodes. The resulting enzymes reveal effective electrical contacting with the electrodes, and exhibit bioelectrocatalytic functions toward the oxidation of glucose to gluconic acid. Magneto-switchable electrocatalysis and bioelectrocatalysis are accomplished by the surface modification of magnetic particles with redox-relay units. By the attraction of the modified magnetic particles to the electrode support, or their retraction from the electrode, by means of an external magnet, the electrochemical functions of the magnetic particle-tethered relays can be switched between "ON" and "OFF" states, respectively. The magneto-switchable redox functionalities of the modified particles activate electrocatalytic transformations, such as a biocatalytic chemoluminescence cascade that leads to magneto-switchable light emission or the activation of bioelectrocatalytic processes.

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Rajakumar, Govindasamy, Lebao Mao, Ting Bao, Wei Wen, Shengfu Wang, Thandapani Gomathi, Nirmala Gnanasundaram et al. « Yttrium Oxide Nanoparticle Synthesis : An Overview of Methods of Preparation and Biomedical Applications ». Applied Sciences 11, n^o 5 (2 mars 2021) : 2172. http://dx.doi.org/10.3390/app11052172.

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Metal oxide nanoparticles demonstrate uniqueness in various technical applications due to their suitable physiochemical properties. In particular, yttrium oxide (Y2O3) nanoparticle is familiar for technical applications because of its higher dielectric constant and thermal stability. It is widely used as a host material for a variety of rare-earth dopants, biological imaging, and photodynamic therapies. Y2O3 has also been used as a polarizer, phosphor, laser host material, and in the optoelectronic fields for cancer therapy, biosensor, and bioimaging. Yttrium oxide nanoparticles have attractive antibacterial and antioxidant properties. This review focuses on the promising applications of Y2O3, its drawbacks, and its modifications. The synthetic methods of nanoparticles, such as sol-gel, emulsion, chemical methods, solid-state reactions, combustion, colloid reaction techniques, and hydrothermal processing, are recapitulated. Herein, we also discuss the advantages and disadvantages of Y2O3 NPs based biosensors that function through various detection modes including colorimetric, electrochemistry, and chemo luminescent regarding the detection of small organic chemicals, metal ions, and biomarkers.

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Mammadyarova, S. J. « SYNTHESIS AND CHARACTERIZATION OF COBALT OXIDE NANOSTRUCTURES. A BRIEF REVIEW ». Azerbaijan Chemical Journal, n^o 2 (29 juin 2021) : 80–93. http://dx.doi.org/10.32737/0005-2531-2021-2-80-93.

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The newest achievement in the synthesis of cobalt oxide nanoparticles are considered. Cobalt oxide nanoparticles have attracted a great attention due to their uncommon properties and application in a supercapacitor, optoelectronic device, Li-ion battery gas sensor and electrochromic devices. Recently, nanostructured transition metal oxides with valuable properties have become a new class of materials for many technological fields. Cobalt oxide nanoparticles obtained from various precursors show different size distribution as well as different optical, electrical, magnetic, and electrochemical properties. A reduction in particle size to nanometer-scale leads to changes in properties compared to bulk ones due to quantum size effects. Depending on the application area, the choice of an appropriate synthesis method for nanoparticles with desirable properties is a crucial factor. This work aims to provide additional information on the synthesis methods and properties of cobalt oxide nanoparticles

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Stavarache, Ionel, Valentin Adrian Maraloiu, Petronela Prepelita et Gheorghe Iordache. « Nanostructured germanium deposited on heated substrates with enhanced photoelectric properties ». Beilstein Journal of Nanotechnology 7 (21 octobre 2016) : 1492–500. http://dx.doi.org/10.3762/bjnano.7.142.

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Obtaining high-quality materials, based on nanocrystals, at low temperatures is one of the current challenges for opening new paths in improving and developing functional devices in nanoscale electronics and optoelectronics. Here we report a detailed investigation of the optimization of parameters for the in situ synthesis of thin films with high Ge content (50 %) into SiO2. Crystalline Ge nanoparticles were directly formed during co-deposition of SiO2 and Ge on substrates at 300, 400 and 500 °C. Using this approach, effects related to Ge–Ge spacing are emphasized through a significant improvement of the spatial distribution of the Ge nanoparticles and by avoiding multi-step fabrication processes or Ge loss. The influence of the preparation conditions on structural, electrical and optical properties of the fabricated nanostructures was studied by X-ray diffraction, transmission electron microscopy, electrical measurements in dark or under illumination and response time investigations. Finally, we demonstrate the feasibility of the procedure by the means of an Al/n-Si/Ge:SiO2/ITO photodetector test structure. The structures, investigated at room temperature, show superior performance, high photoresponse gain, high responsivity (about 7 AW−1), fast response time (0.5 µs at 4 kHz) and great optoelectronic conversion efficiency of 900% in a wide operation bandwidth, from 450 to 1300 nm. The obtained photoresponse gain and the spectral width are attributed mainly to the high Ge content packed into a SiO2 matrix showing the direct connection between synthesis and optical properties of the tested nanostructures. Our deposition approach put in evidence the great potential of Ge nanoparticles embedded in a SiO2 matrix for hybrid integration, as they may be employed in structures and devices individually or with other materials, hence the possibility of fabricating various heterojunctions on Si, glass or flexible substrates for future development of Si-based integrated optoelectronics.

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Naseer, Sania, Muhammad Aamir, Muhammad Aslam Mirza, Uzma Jabeen, Raja Tahir, Muhammad Najam Khan Malghani et Qamar Wali. « Synthesis of Ni–Ag–ZnO solid solution nanoparticles for photoreduction and antimicrobial applications ». RSC Advances 12, n^o 13 (2022) : 7661–70. http://dx.doi.org/10.1039/d2ra00717g.

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Manhas, Nidhi, Lalita S. Kumar et Vinayak Adimule. « Photoluminescence and Supercapacitive Properties of Carbon Dots Nanoparticles : A Review ». Journal of Metastable and Nanocrystalline Materials 37 (21 juillet 2023) : 1–22. http://dx.doi.org/10.4028/p-lpi6yw.

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Carbon Dots (CDs) have gained the attention of many researchers since its discovery in 2004 due to their unique nanostructure and properties. These are very promising carbonaceous nanomaterials having wide range of applications in sensors, imaging, energy storage, nanomedicine, electrocatalysis and optoelectronics. CDs have shown excellent physical and chemical properties like, high crystallization, good dispersibility and photoluminescence. Besides, these are now known to have excellent biocompatibility, long-term chemical stability, cost-effectiveness and negligible toxicity. Due to favourable physical structure and chemical characteristics, these nanocarbon-based materials have drawn an interest as supercapacitor (SC) electrode materials, opening upnew opportunities to increase the energy density and lifespan of SCs. Thus, variety of quick and affordable methods i.e., the arc-discharge method, microwave pyrolysis, hydrothermal method, and electrochemical synthesis have been developed to synthesize this versatile nanomaterial. There are undoubtedly many methods for creating CDs that are effective and affordable, but due to the safety and simplicity of synthesis, CDs made from waste or using environmentally friendly methods have been innovated. In order to devise sustainable chemical strategies for CDs, green synthetic methodologies based on "top-down" and "bottom-up" strategies have been prioritised. This review summarizes numerous synthetic strategies and studies that are essential for the creation of environment friendly processes for CDs. The recent developments in the use of CDs for photoluminescence and supercapacitance have been highlighted providing a clear understanding of the new source of energy and optoelectronic materials with a futuristic perspective.

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Mennicken, Max, Sophia Katharina Peter, Corinna Kaulen, Ulrich Simon et Silvia Karthäuser. « Impact of device design on the electronic and optoelectronic properties of integrated Ru-terpyridine complexes ». Beilstein Journal of Nanotechnology 13 (15 février 2022) : 219–29. http://dx.doi.org/10.3762/bjnano.13.16.

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The performance of nanoelectronic and molecular electronic devices relies strongly on the employed functional units and their addressability, which is often a matter of appropriate interfaces and device design. Here, we compare two promising designs to build solid-state electronic devices utilizing the same functional unit. Optically addressable Ru-terpyridine complexes were incorporated in supramolecular wires or employed as ligands of gold nanoparticles and contacted by nanoelectrodes. The resulting small-area nanodevices were thoroughly electrically characterized as a function of temperature and light exposure. Differences in the resulting device conductance could be attributed to the device design and the respective transport mechanism, that is, thermally activated hopping conduction in the case of Ru-terpyridine wire devices or sequential tunneling in nanoparticle-based devices. Furthermore, the conductance switching of nanoparticle-based devices upon 530 nm irradiation was attributed to plasmon-induced metal-to-ligand charge transfer in the Ru-terpyridine complexes used as switching ligands. Finally, our results reveal a superior device performance of nanoparticle-based devices compared to molecular wire devices based on Ru-terpyridine complexes as functional units.

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Khasim, S., A. Pasha, M. Lakshmi, C. Panneerselvam, A. A. A. Darwish, T. A. Hamdalla, S. Alfadhli et S. A. Al-Ghamdi. « Conductivity and dielectric properties of heterostructures based on novel graphitic carbon nitride and silver nanoparticle composite film for electronic applications ». Digest Journal of Nanomaterials and Biostructures 17, n^o 4 (25 octobre 2022) : 1089–98. http://dx.doi.org/10.15251/djnb.2022.174.1089.

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Graphitic-carbon nitride (g-C3N4) (GCN) has emerged as the most promising material for the fabrication of next generation cutting–edge electronic and optoelectronic devices, due to its excellent and promising electrical and physicochemical properties. In this work we report on strategies to enhance the electrical conductivity of GCN thin films through the formation of heterostructures using silver nanoparticles (Ag). The synergistic effect of silver nanoparticles doping on structural and transport properties of GCN thin films was studied in detail. The structural and morphological changes in GCN polymer owing to the inclusion of silver nanoparticles were examined through Scanning electron microscopy, Fourier transform spectroscopy and X-ray diffractometer techniques. The conformational modifications in GCN polymer chains due to silver nanoparticles doping greatly enhanced the electrical conductivity of GCN thin films. The inclusion of silver nanoparticles in GCN polymer matrix decreases the barrier energy and enables the charge carrier hopping easily leading to improved electrical conductivity. The electrical conductivity of GCN-Ag composite thin film was enhanced by two folds due to the silver nanoparticles inclusion in comparison to conductivity of the pristine GCN thin film. The presence of Ag nanoparticles in the composite film plays a substantial role in improving the dielectric attributes of the pure GCN. Therefore, the doping by using silver nanoparticles might be a suitable strategy for effectively tailoring the electrical conductivity and dielectric properties of GCN thin films and can be used as flexible conducting electrode material towards fabrication of electronic and optoelectronic devices

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Gad, G. M. A., et Maroof A. Hegazy. « Optoelectronic properties of gold nanoparticles synthesized by using wet chemical method ». Materials Research Express 6, n^o 8 (8 mai 2019) : 085024. http://dx.doi.org/10.1088/2053-1591/ab1bb8.

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Das, U., et D. Mohanta. « Evolution of ZnO nanoparticles and nanorods : aspect ratio dependent optoelectronic properties ». European Physical Journal Applied Physics 53, n^o 1 (23 décembre 2010) : 10602. http://dx.doi.org/10.1051/epjap/2010100326.

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Cho, Er-Chieh, Jui-Hsiung Huang, Chiu-Ping Li, Cai-Wan Chang-Jian, Kuen-Chan Lee et Jen-Hsien Huang. « The optoelectronic properties and applications of solution-processable titanium oxide nanoparticles ». Organic Electronics 18 (mars 2015) : 126–34. http://dx.doi.org/10.1016/j.orgel.2015.01.003.

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Ghanbari, Bahareh, Farid Jamali-Sheini et Ramin Yousefi. « Microwave-assisted solvothermal synthesis and optoelectronic properties of γ-MnS nanoparticles ». Journal of Materials Science : Materials in Electronics 29, n^o 13 (9 mai 2018) : 10976–85. http://dx.doi.org/10.1007/s10854-018-9179-9.

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Ismail, Raid A., Fattin A. Fadhil et Halah H. Rashed. « Novel route to prepare lanthanum oxide nanoparticles for optoelectronic devices ». International Journal of Modern Physics B 34, n^o 13 (20 mai 2020) : 2050134. http://dx.doi.org/10.1142/s0217979220501349.

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In this study, we report, for the first time, on synthesis of lanthanum oxide [Formula: see text] nanoparticles NPs by laser ablation in water without using surfactant. The effect of laser wavelength on the optical and structural properties of [Formula: see text] NPs was investigated. X-ray diffraction studies show formation of polycrystalline lanthanum oxide with pure cubic phase and the crystallinity of the nanoparticles synthesized with [Formula: see text] nm was better than that prepared with [Formula: see text] nm. The optical absorption investigations reveal that a strong absorption peak at 234 nm was observed for [Formula: see text] NPs prepared at 532 nm laser wavelength. The optical energy gap of [Formula: see text] NPs synthesized with 532 and 1064 nm laser wavelengths were 5 and 4.5 eV, respectively. Scanning electron microscope (SEM) investigation indicated the formation of nanoparticles with average particle size of 35 nm for [Formula: see text] prepared with 532 nm and was 75 nm for [Formula: see text] prepared with 1064 nm laser wavelength. The effect of laser wavelength on the optoelectronic properties of hybrid In/p-[Formula: see text]/n-Si photodetector was studied. The responsivity studies of the photodetectors show the presence of two response peaks at 250 and 750 nm.

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Xie, Ling-Hai, Su-Hui Yang, Jin-Yi Lin, Ming-Dong Yi et Wei Huang. « Fluorene-based macromolecular nanostructures and nanomaterials for organic (opto)electronics ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 371, n^o 2000 (13 octobre 2013) : 20120337. http://dx.doi.org/10.1098/rsta.2012.0337.

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Nanotechnology not only opens up the realm of nanoelectronics and nanophotonics, but also upgrades organic thin-film electronics and optoelectronics. In this review, we introduce polymer semiconductors and plastic electronics briefly, followed by various top-down and bottom-up nano approaches to organic electronics. Subsequently, we highlight the progress in polyfluorene-based nanoparticles and nanowires (nanofibres), their tunable optoelectronic properties as well as their applications in polymer light-emitting devices, solar cells, field-effect transistors, photodetectors, lasers, optical waveguides and others. Finally, an outlook is given with regard to four-element complex devices via organic nanotechnology and molecular manufacturing that will spread to areas such as organic mechatronics in the framework of robotic-directed science and technology.

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Abulikemu, Mutalifu, Marios Neophytou, Jérémy M. Barbé, Max L. Tietze, Abdulrahman El Labban, Dalaver H. Anjum, Aram Amassian, Iain McCulloch et Silvano Del Gobbo. « Microwave-synthesized tin oxide nanocrystals for low-temperature solution-processed planar junction organo-halide perovskite solar cells ». Journal of Materials Chemistry A 5, n^o 17 (2017) : 7759–63. http://dx.doi.org/10.1039/c7ta00975e.

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Tin oxide nanoparticles prepared by microwave-assisted non-aqueous sol–gel were used to cast an electron transporting layer for organohalide perovskite solar cells showing, in average, high efficiencies thanks to the good optoelectronic properties of the material.

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Sosna-Głębska, Aleksandra, Natalia Szczecińska, Katarzyna Znajdek et Maciej Sibiński. « Review on metallic oxide nanoparticles and their application in optoelectronic devices ». Acta Innovations, n^o 30 (1 janvier 2019) : 5–15. http://dx.doi.org/10.32933/actainnovations.30.1.

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Among the large family of metallic oxides, there is a considerable group possessing excellent semiconducting properties. What follows, they are promising materials for applications in the field of optoelectronics and photonics. Thanks to the development of nanotechnology in the last few decades, it is now possible to manufacture a great variety of different nanostructures. By controlling their size, shape, composition and crystallinity, one can influence such properties as band gap, absorption properties, surface to volume ratio, conductivity, and, as a consequence, tune the material for the chosen application. The following article reviews the research conducted in the field of application of the metallic oxide nanoparticles, especially ZnO, TiO2 and ITO (Indium-Tin Oxide), in such branches of optoelectronics as solid-state lightning, photodetectors, solar-cells and transparent conducting layers.

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Chazapis, Nikolaos, Michalis Stavrou, Georgia Papaparaskeva, Alexander Bunge, Rodica Turcu, Theodora Krasia-Christoforou et Stelios Couris. « Iridium-Based Nanohybrids : Synthesis, Characterization, Optical Limiting, and Nonlinear Optical Properties ». Nanomaterials 13, n^o 14 (22 juillet 2023) : 2131. http://dx.doi.org/10.3390/nano13142131.

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The present work reports on the synthesis and characterization of iridium (Ir)-based nanohybrids with variable chemical compositions. More specifically, highly stable polyvinylpyrrolidone (PVP) nanohybrids of the PVP-IrO2 and PVP-Ir/IrO2 types, as well as non-coated Ir/IrO2 nanoparticles, are synthesized using different synthetic protocols and characterized in terms of their chemical composition and morphology via X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM), respectively. Furthermore, their nonlinear optical (NLO) response and optical limiting (OL) efficiency are studied by means of the Z-scan technique, employing 4 ns laser pulses at 532 and 1064 nm. The results demonstrate that the PVP-Ir/IrO2 and Ir/IrO2 systems exhibit exceptional OL performance, while PVP-IrO2 presents very strong saturable absorption (SA) behavior, indicating that the present Ir-based nanohybrids could be strong competitors to other nanostructured materials for photonic and optoelectronic applications. In addition, the findings denote that the variation in the content of IrO2 nanoparticles by using different synthetic pathways significantly affects the NLO response of the studied Ir-based nanohybrids, suggesting that the choice of the appropriate synthetic method could lead to tailor-made NLO properties for specific applications in photonics and optoelectronics.

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Shruthi, K. N., V. Ramaraja Varma, Mohan Kumar, Sushma et Ganesh Sanjeev. « Structural and Optical Properties of PMMA-MgO Nanocomposite Film ». IOP Conference Series : Materials Science and Engineering 1300, n^o 1 (1 avril 2024) : 012020. http://dx.doi.org/10.1088/1757-899x/1300/1/012020.

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Abstract This study investigates the structural, morphological, and optical properties of poly(methyl methacrylate) (PMMA) films incorporated with magnesium oxide (MgO) nanoparticles. The PMMA-MgO polymer nanocomposite (PNC) films were fabricated via solution casting method using varying weight percentages (1-4 wt%) of MgO nanoparticles. X-ray diffraction analysis confirmed the integration of MgO nanofillers in the PMMA matrix. Fourier transform infrared spectroscopy revealed interactions between PMMA and MgO nanoparticles. Atomic force microscopy demonstrated increased surface roughness in PNC films with higher MgO loading. Optical characterization using UV-visible spectroscopy showed enhanced absorption in the UV region and a noticeable peak at 280 nm due to MgO nanoparticles. The refractive index of PMMA-MgO PNCs increased with rising MgO content while the optical bandgap marginally decreased. The study highlights the potential of PMMA-MgO PNC films for advanced optoelectronic applications requiring high optical transparency and tuneable refractive index.

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