Articles de revues : « Photoluminescence - Nanostructures »

1

Zhang, Shiying, Huizhao Zhuang, Chengshan Xue et Baoli Li. « Effect of Annealing on Morphology and Photoluminescence of β-Ga2O3 Nanostructures ». Journal of Nanoscience and Nanotechnology 8, n^o 7 (1 juillet 2008) : 3454–57. http://dx.doi.org/10.1166/jnn.2008.138.

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A novel method was applied to prepare one-dimensional β-Ga2O3 nanostructure films. In this method, β-Ga2O3 nanostructures have been successfully synthesized on Si(111) substrates through annealing sputtered Ga2O3/Mo films for differernt time under flowing ammonia. The as-synthesized β-Ga2O3 nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results show that the formed nanostructures are single-crystalline Ga2O3 with monoclinic structure. The annealing time of the samples has an evident influence on the morphology and optical property of the nanostructured β-Ga2O3 synthesized. The representative photoluminescence spectrum at room temperature exhibits a strong and broad emission band centered at 411.5 nm and a relatively weak emission peak located at 437.6 nm. The growth mechanism of the β-Ga2O3 nanostructured materials is also discussed briefly.

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Gong, Jiang Feng, Wei Hua Zhu, Kai Xiao Zhang, Ming Yi Liu et Hai Yan Xie. « Synthesis Aligned ZnS Nanocone and its Photoluminescence ». Advanced Materials Research 295-297 (juillet 2011) : 610–13. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.610.

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We report the synthesis and characterization of ZnS nanostructures, which were grown by thermal evaporation of the ZnS powder at high temperature using iron network as the collection substrate. Scanning electron microscopy investigations show that the products present taper-like morphologies. Transmission electron microscopy studies indicate ZnS nanostructures are well crystallized. The formation mechanism of the novel nanostructure is discussed on the basis of the experimental results; The nanostructure is formed due to a fast growth of ZnS nanowire along [0001] and the subsequent “epitaxial” radial growth of the ZnS nanocone along the six (01-10) surfaces around the nanowire. A strong room-temperature photoluminescence in ZnS nanostructures has been demonstrated.

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Botsoa, Jacques, Jean Marie Bluet, Vladimir Lysenko, Olivier Marty, Daniel Barbier et Gérard Guillot. « Photoluminescence of 6H-SiC Nanostructures ». Materials Science Forum 556-557 (septembre 2007) : 407–10. http://dx.doi.org/10.4028/www.scientific.net/msf.556-557.407.

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Photoluminescence properties of a freestanding nanoporous SiC layer obtained from bulk 6H-SiC substrate as well as SiC nanopowder consisting of numerous separated nanoparticles has been investigated. The nanoporous SiC layer is obtained by UV radiation assisted electrochemical etching of the 6H-SiC wafer and the SiC nanopowder is formed by mechanical grinding of the nanoporous SiC free layer. A comparison of low temperature PL spectra of the SiC nanostructures and initial SiC bulk substrate has been performed. The evolution of PL spectra of the SiC nanostructures with respect to their surface states and excitation laser power has been studied. In particular, the well pronounced high energy tail above the excitonic bandgap in the PL spectra of the nanostructured SiC is attributed to quantum confinement effects. The strong PL signal obtained below the bandgap is explained by radiative transitions involving surface states, N-Al donoracceptor recombination levels and deep levels corresponding to volume defects in the SiC nanocrystallites.

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Husairi, F. S., K. Eswar, Z. N. Atikah, A. Azlinda, M. Rusop et S. Abdullah. « The Fabrication of PSi/ZnO Nanostructures as Chemical Sensors for the Detection of Ethanol in Solution Using an Electrochemical Impedance Technique ». Applied Mechanics and Materials 773-774 (juillet 2015) : 642–46. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.642.

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In this work, porous silicon (PSi) was prepared by electrochemical etching and used as a template for ZnO nanostructures. ZnO nanostructures were grown using the catalytic immersion method at different molar ratio concentrations of the precursor and stabilizer. The ZnO nanostructures were analyzed using FESEM and photoluminescence (PL) spectrometry, before tested with ethanol solution. The population of the ZnO nanostructures on PSi increased with the concentration and followed the surface morphology of PSi. The photoluminescence spectra of ZnO show two dominant peaks in the UV and visible regions. When the concentration of the precursor increased, the PL peaks in the visible region (630 nm) shifted towards the blue region of the spectrum. The PSi/ZnO nanostructure chemical sensor has a large surface area, reversing sensor and fast response in ethanol. The performance of the sensor was affected by the morphology and defect structures of the ZnO nanostructures layer.

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Скурлов, И. Д., П. С. Парфёнов, А. В. Соколова, Д. А. Татаринов, А. А. Бабаев, М. А. Баранов et А. П. Литвин. « Фотоиндуцированный перенос заряда в слоистых 2D наноструктурах PbSe-MoS-=SUB=-2-=/SUB=- ». Оптика и спектроскопия 130, n^o 2 (2022) : 325. http://dx.doi.org/10.21883/os.2022.02.52003.2773-21.

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Semiconductor 2D nanostructures are a new platform for the creation of modern optoelectronic devices. Layered 2D PbSe-MoS2 nanostructures with efficient photoinduced charge transfer from PbSe nanoplatelets (NPLs) to MoS2 were created. When PbSe NPLs with short organic ligands are deposited onto a thin layer of MoS2 NPLs, a decrease in their photoluminescence intensity and a decrease in the average photoluminescence lifetime are observed. When a layered 2D PbSe-MoS2 nanostructure is illuminated with IR radiation, a photocurrent appears, which indicates the contribution of PbSe NPLs to the electrical response of the system. Ultrathin layers of transition metal dichalcogenides sensitized with nanostructures based on lead chalcogenides can be used in photodetectors with a spectral sensitivity region extended to the near-IR range.

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Husairi, F. S., Syahirah Mhd Ali, A. Azlinda, M. Rusop et S. Abdullah. « Special Effect of Urea as a Stabilizer in Thermal Immersion Method to Synthesis Porous Zinc Oxide Nanostructures ». Journal of Nanomaterials 2013 (2013) : 1–7. http://dx.doi.org/10.1155/2013/163527.

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ZnO nanostructure was prepared by catalytic immersion method (90°C) with zinc nitrate hexahydrate (Zn(NO3)26H2O) as a precursors and urea (CH4N2O) as a stabilizer. Different molarity concentration ratio of Zn(NO3)26H2O to CH4N2O, 2 : 1, 1 : 4, 1 : 6, and 1 : 8 is used in this work. The effect of urea concentration used during the synthesis process is discussed. The ZnO nanostructures were characterized by using field emission scanning electron microscope (FESEM), photoluminescene (PL), andI-Vprobe. Porous nanoflakes are successfully synthesized on p-type silicon substrate coated with gold layer with different size and dimension. High intensity photoluminescence (PL) at optimum concentration indicated that urea is good stabilizer to produce ZnO nanostructures with good crytallinity. Rectifying characteristics show dramaticaly change in turn-on voltage when the concentration of urea increases in aqueous solution. This is related to the theory about p-type doping of ZnO nanostructures by nitrogen from NH3.

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Jalolov, R. R., B. N. Rustamova, Sh Z. Urolov et Z. Sh Shaymardanov. « The influence of size on the photoluminescence properties of ZnO nanostructures ». «Узбекский физический журнал» 23, n^o 2 (14 septembre 2021) : 40–44. http://dx.doi.org/10.52304/.v23i2.238.

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This paper describes methods for synthesizing different nanostructures of ZnO in aqueous solutions at low temperatures and examines the effect of the size of the synthesized samples on the photoluminescence (PL) spectra. As the diameters of the nanostructures increased, a decrease in the ratio of the intensity of the ultraviolet radiation band to the intensity of the yellow radiation band in the PL spectrum observed. It is found that changing the diameters of nanostructures from 15 nm to 1000 nm leads to a decrease in their bandgap energy (Eg) from 3.28 to 3.21 eV. When the diameters of the nanostructures were less than ~400 nm, it was found that the energy of the band gap was strongly depend on the size of the nanostructure, and that the bond was weaker as the size of the nanostructures exceeded 400 nm.

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Galdámez-Martinez, Andres, Guillermo Santana, Frank Güell, Paulina R. Martínez-Alanis et Ateet Dutt. « Photoluminescence of ZnO Nanowires : A Review ». Nanomaterials 10, n^o 5 (29 avril 2020) : 857. http://dx.doi.org/10.3390/nano10050857.

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One-dimensional ZnO nanostructures (nanowires/nanorods) are attractive materials for applications such as gas sensors, biosensors, solar cells, and photocatalysts. This is due to the relatively easy production process of these kinds of nanostructures with excellent charge carrier transport properties and high crystalline quality. In this work, we review the photoluminescence (PL) properties of single and collective ZnO nanowires and nanorods. As different growth techniques were obtained for the presented samples, a brief review of two popular growth methods, vapor-liquid-solid (VLS) and hydrothermal, is shown. Then, a discussion of the emission process and characteristics of the near-band edge excitonic emission (NBE) and deep-level emission (DLE) bands is presented. Their respective contribution to the total emission of the nanostructure is discussed using the spatial information distribution obtained by scanning transmission electron microscopy−cathodoluminescence (STEM-CL) measurements. Also, the influence of surface effects on the photoluminescence of ZnO nanowires, as well as the temperature dependence, is briefly discussed for both ultraviolet and visible emissions. Finally, we present a discussion of the size reduction effects of the two main photoluminescent bands of ZnO. For a wide emission (near ultra-violet and visible), which has sometimes been attributed to different origins, we present a summary of the different native point defects or trap centers in ZnO as a cause for the different deep-level emission bands.

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Skurlov I. D., Parfenov P. S., Sokolova A. V., Tatarinov D. A., Babaev A. A., Baranov M. A. et Litvin A. P. « Photoinduced charge transfer in layered 2D PbSe-MoS-=SUB=-2-=/SUB=- nanostructures ». Optics and Spectroscopy 132, n^o 2 (2022) : 298. http://dx.doi.org/10.21883/eos.2022.02.53226.2773-21.

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Semiconductor 2D nanostructures are a new platform for the creation of modern optoelectronic devices. Layered 2D PbSe-MoS2 nanostructures with efficient photoinduced charge transfer from PbSe nanoplatelets (NPLs) to MoS2 were created. When PbSe NPLs with short organic ligands are deposited onto a thin layer of MoS2 NPLs, a decrease in their photoluminescence intensity and a decrease in the average photoluminescence lifetime are observed. When a layered 2D PbSe-MoS2 nanostructure is illuminated with IR radiation, a photocurrent appears, which indicates the contribution of PbSe NPLs to the electrical response of the system. Ultrathin layers of transition metal dichalcogenides sensitized with nanostructures based on lead chalcogenides can be used in photodetectors with a spectral sensitivity region extended to the near-IR range. Keywords: nanoplatelets, transition metal dichalcogenides, charge transfer, near infrared region.

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Wang, S. L., H. W. Zhu, W. H. Tang et P. G. Li. « Propeller-Shaped ZnO Nanostructures Obtained by Chemical Vapor Deposition : Photoluminescence and Photocatalytic Properties ». Journal of Nanomaterials 2012 (2012) : 1–5. http://dx.doi.org/10.1155/2012/594290.

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Propeller-shaped and flower-shaped ZnO nanostructures on Si substrates were prepared by a one-step chemical vapor deposition technique. The propeller-shaped ZnO nanostructure consists of a set of axial nanorod (50 nm in tip, 80 nm in root and 1 μm in length), surrounded by radial-oriented nanoribbons (20–30 nm in thickness and 1.5 μm in length). The morphology of flower-shaped ZnO nanostructure is similar to that of propeller-shaped ZnO, except the shape of leaves. These nanorods leaves (30 nm in diameter and 1–1.5 μm in length) are aligned in a radial way and pointed toward a common center. The flower-shaped ZnO nanostructures show sharper and stronger UV emission at 378 nm than the propeller-shaped ZnO, indicating a better crystal quality and fewer structural defects in flower-shaped ZnO. In comparison with flower-shaped ZnO nanostructures, the propeller-shaped ZnO nanostructures exhibited a higher photocatalytic property for the photocatalytic degradation of Rhodamine B under UV-light illumination.

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Liu, Yichun, et Yanhong Tong. « Growth and Optical Properties of ZnO Low-Dimensional Nanostructures ». Journal of Nanoscience and Nanotechnology 8, n^o 3 (1 mars 2008) : 1101–9. http://dx.doi.org/10.1166/jnn.2008.18158.

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Recent studies on the growth of ZnO nanostructures and their optical properties were reviewed. Using different methods, a variety of ZnO nanostructures, including quantum dots nanotowers, nanotubes, nanorods, nanowires, and nanosheets, displaying zero, one, and two dimensions, have been synthesized. The growth of ZnO low-dimensional nanostructures has been demonstrated. Their optical properties have been studied by means of room-temperature photoluminescence spectra, low-temperature photoluminescence spectra, temperature-dependent photoluminescence spectra, and pressure-dependent photoluminescence spectra. The optical properties can be adjusted by the surface features of ZnO low-dimensional nanostructures. The strong exciton emission has been observed in some nanostructures, showing promising potential in nanodevice applications.

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Zhang, Baohua, Fuqiang Guo et Wei Wang. « Synthesis and Characterization of ZnTe Hierarchical Nanostructures ». Journal of Nanomaterials 2012 (2012) : 1–5. http://dx.doi.org/10.1155/2012/293041.

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Single-crystalline ZnTe hierarchical nanostructures have been successfully synthesized by a simple thermal evaporation technology. The as-prepared products were characterized with X-ray diffraction (XRD), scanning electron microcopy (SEM), transmission electron microscope (TEM), and photoluminescence spectrum (PL). These results showed that the ZnTe hierarchical nanostructures consisted of nanowires and nanolumps. The room temperature PL spectrum exhibited a pure green luminescence centered at 545nm. The growth mechanism of hierarchical nanostructure was also discussed.

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Alemu, Gurmessa, Melese Getnet, Veerayya Choudary Lingamaneni et Shewamare Sisay. « Photoluminescence from GaAs nanostructures ». International Journal of Physical Sciences 10, n^o 3 (16 février 2015) : 106–11. http://dx.doi.org/10.5897/ijps2014.4245.

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Mohd Bakhori, Siti Khadijah, Chuo Ann Ling et Shahrom Mahmud. « Photoluminescence and Raman Studies of Annealed ZnO Nanostructures ». Advanced Materials Research 501 (avril 2012) : 179–83. http://dx.doi.org/10.4028/www.scientific.net/amr.501.179.

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The influence of annealing on the optical properties of as-grown ZnO nanostructures prepared in pellets has been investigated by photoluminescence (PL) and Raman spectroscopy. The annealing temperatures of ZnO nanostructure at 600°C, 650°C and 700 °C were conducted in oxygen (O2) and nitrogen (N2) ambient. The near band edge emission (NBE) of samples recorded in the PL spectra demonstrates significant changes on optical signal whereby the NBE is redshifted after O2 annealed and became slightly higher in N2 annealed. Apart from that, weak green luminescence (GL) namely deep band emission (DBE) is observed centre at 532.95 nm (2.23 eV) and 511.00 nm (2.42 eV) for annealed in O2 and N2 respectively, whereas lower DBE observed in as-grown ZnO. On the other hand, Raman shift reveal the phonon mode of the ZnO nanostructures and the E2 (high) mode were downshifted as annealed in O2 ambient, and upshifted in N2 ambient. The downshift and upshift of the E2 (high) mode are correlated to tensile and compressive stress. Moreover the crystallite sizes were calculated from FWHM of XRD and TEM microscopy reveals the nanoplates structure of ZnO nanostructures.

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Mamat, Mohamad Hafiz, Zuraida Khusaimi et Mohamad Mahmood Rusop. « Growth of Multi-Shaped Zinc Oxide Nanostructures Using C-Axis Oriented Zinc Oxide Thin Film as a Seeded Catalyst via Hydrothermal Aqueous Chemical Growth Method ». Defect and Diffusion Forum 312-315 (avril 2011) : 1126–31. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.1126.

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Zinc oxide (ZnO) nanostructures with different kind of morphologies were synthesized on glass substrates via the hydrothermal aqueous chemical growth method utilizing c-axis oriented ZnO thin film as seeded catalyst. By preparing ZnO thin film at different molar concentrations between 0.2~1.0 M, oval shaped ZnO nanostructures mixed with ZnO nanowires and rod shaped ZnO nanostructures mixed with ZnO nanowires were produced after immersion process into 0.0002 M zinc nitrate solution for 24 hour. The XRD spectra show synthesized ZnO nanostructures were ZnO hexagonal wurtzite crystalline. The photoluminescence (PL) measurement indicates the luminescences of the samples were depending on the shapes of ZnO nanostructure.

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Rauwel, Protima, Martin Salumaa, Andres Aasna, Augustinas Galeckas et Erwan Rauwel. « A Review of the Synthesis and Photoluminescence Properties of Hybrid ZnO and Carbon Nanomaterials ». Journal of Nanomaterials 2016 (2016) : 1–12. http://dx.doi.org/10.1155/2016/5320625.

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Photoluminescent ZnO carbon nanomaterials are an emerging class of nanomaterials with unique optical properties. They each, ZnO and carbon nanomaterials, have an advantage of being nontoxic and environmentally friendly. Their cost-effective production methods along with simple synthesis routes are also of interest. Moreover, ZnO presents photoluminescence emission in the UV and visible region depending on the synthesis routes, shape, size, deep level, and surface defects. When combined with carbon nanomaterials, modification of surface defects in ZnO allows tuning of these photoluminescence properties to produce, for example, white light. Moreover, efficient energy transfer from the ZnO to carbon nanostructures makes them suitable candidates not only in energy harvesting applications but also in biosensors, photodetectors, and low temperature thermal imaging. This work reviews the synthesis and photoluminescence properties of 3 carbon allotropes: carbon quantum or nanodots, graphene, and carbon nanotubes when hybridized with ZnO nanostructures. Various synthesis routes for the hybrid materials with different morphologies of ZnO are presented. Moreover, differences in photoluminescence emission when combining ZnO with each of the three different allotropes are analysed.

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Green, Joshua M., Juno Lawrance et Jun Jiao. « Controlled Fabrication of High-Yield CdS Nanostructures by Compartment Arrangement ». Journal of Nanomaterials 2008 (2008) : 1–4. http://dx.doi.org/10.1155/2008/107943.

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High-yield, high-purity CdS nanostructures were synthesized in a turf-like configuration using an improved vapor-liquid-solid method. To increase the yield, a compartment arrangement was employed. The specific kind of nanostructure fabricated was found to be directly dependent on the temperature in the compartment. Along with the high-yield growth of CdS nanorods, nanowires, and nanobelts, intertwined structures were also observed, and the electron field emission property of the intertwined structures was investigated and compared with that of other type of nanostructures. Photoluminescence measurements at 10 K showed a peak emission from the CdS nanostructures at 485 nm.

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Michailovska, K. V. « Nickel-induced enhancement of photoluminescence in nc-Si-SiOx nanostructures ». Semiconductor Physics Quantum Electronics and Optoelectronics 17, n^o 4 (10 novembre 2014) : 336–40. http://dx.doi.org/10.15407/spqeo17.04.336.

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Kumekov, S. E. « DIFFUSIVE SPECTRA OF ANTISTOKES WING OF PHOTOLUMINESCENCE OF CARBON NANOSTRUCTURES ». Eurasian Physical Technical Journal 16, n^o 1 (14 juin 2019) : 30–34. http://dx.doi.org/10.31489/2019no1/30-34.

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Kiruba, R., et Solomon Jeevaraj A. Kingson. « Synthesis and Spectral Analysis of PVP Capped Zinc Oxide Nanostructures ». Advanced Materials Research 1086 (février 2015) : 75–78. http://dx.doi.org/10.4028/www.scientific.net/amr.1086.75.

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Monodispersed polyvinylpyrrolidone capped nanostructures of zinc oxide are prepared through chemical precipitation technique. The prepared nanostructures are characterized by XRD, SEM and Photoluminescence spectroscopic techniques. X-ray diffraction studies confirm the hexagonal structure of zinc oxide nanostructures. Nanostructures of the prepared zinc oxide are confirmed by SEM. The emission wavelength of PVP capped zinc oxide is found to be 551 nm using photoluminescence spectra.

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Choy, W. C. H., C. F. Guo, K. H. Pang et Y. P. Leung. « CVD Grown Zinc Based Nanostructures on Zinc Selenide Microscale Grains ». Solid State Phenomena 121-123 (mars 2007) : 347–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.347.

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With a suitable growth condition using CVD method, single crystal ZnO nanorods grow on the well-defined bounded facets of the random shape ZnSe grains using Zn and Se powders without any metal catalyst. To our best knowledge, there is no report in growing ZnO nanostructures on in-situ synthesized ZnSe. The growth direction of ZnSe nanorods on a facet of a ZnSe grain is quiet uniform. The growth mechanism of the nanostructure will be discussed. Meanwhile, the photoluminescence of the nanostructures will be investigated.

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Gridchin V. O., Soshnikov I. P., Reznik R. R., Komarov S. D., Pirogov E. V., Lendyashova V. V., Kotlyar K. P., Kryzhanovskaya N. V. et Cirlin G. E. « Effect of Nitrogen Plasma Treatment on the Structural and Optical Properties of InGaN ». Technical Physics Letters 49, n^o 3 (2023) : 27. http://dx.doi.org/10.21883/tpl.2023.03.55679.19452.

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The effect of cooling conditions in the plasma-assisted molecular-beam epitaxy growth on the structural and optical properties of InGaN nanostructures is studied. It is shown that cooling of the samples without nitrogen plasma contributes to the suppression of phase separation in InGaN nanostructures. The integrated intensity of photoluminescence from these nanostructures increased by a factor of 2. Keywords: InGaN, silicon, nanostructures, photoluminescence, structural properties, optical properties, molecular beam epitaxy, nitrogen plasma.

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PAL, U., N. MORALES-FLORES et E. RUBIO-ROSAS. « Effect of Nb Doping on Morphology, Optical and Magnetic Behaviors of Ultrasonically Grown Zno Nanostructures ». Material Science Research India 14, n^o 2 (28 septembre 2017) : 79–88. http://dx.doi.org/10.13005/msri/140201.

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ZnO nanostructures containing doped with different atom % of Nb are fabricated through ultrasound assisted hydrolysis in water. Effects of Nd incorporation on the structure, morphology, defect structure, optical, and magnetic behaviors of the nanostructures have been studied utilizing X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy and magnetometry. We demonstrate that while Nb incorporation in ZnO nanostructures drastically modify their morphology and crystallinity, it does not affect the band gap energy of of ZnO significantly. While Nb incorporation in small concentration creates higher oxygen vacancy related defects in ZnO nanostructures, which are responsible for their visible emissions, incorporation of Nb in higher concentration reduces those defect structures from the band gap of the nanostructures. While oxygen vacancies have been frequently associated to the ferromagnetic behavior of ZnO nanostructures, our results indicate that a mere presence of oxygen vacancy in Nb-doped ZnO nanostructure does not guaranty their ferromagnetic behavior.

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Abdolrezapour, F., et M. Moradi. « High optical quality long ultrafine ZnO nanowires by low-temperature oxidation of sputtered nanostructured Zn templates ». International Journal of Modern Physics B 32, n^o 27 (30 octobre 2018) : 1850297. http://dx.doi.org/10.1142/s0217979218502971.

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In this study, we show that by applying appropriate deposition conditions, Zn nanostructured templates for the growth of zinc oxide (ZnO) nanowires can be fabricated, from which ultrafine high optical quality nanowires can be grown by means of post-deposition low-temperature oxidation. By identifying and optimizing the appropriate parameters, we successfully fabricated long ultrafine ZnO nanowires up to 30 microns in length and 50 nm in diameter. Our report contradicts the commonly held paradigm that sputter deposition can only be used to fabricate thin films with no significant nanostructure morphology and provides a low cost, high throughput method of fabricating different ZnO nanostructures. The studies of photoluminescence (PL) of the nanowires showed their high optical quality with band edge dominated emission with small defect-related input.

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Eswar, Kevin Alvin, Husairi Fadzilah Shuhaimi, Muzammil Mat Akhir, Nurul Afaah Abdullah, Noor Aadilla Abdul Aziz, N. A. M. Asib, Ruziana Mohamed et al. « Post-Annealing Temperature Effect on ZnO Nanostructures Growth on Porous Silicon ». Advanced Materials Research 1109 (juin 2015) : 434–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.434.

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In this study, ZnO nanostructures were synthesized on porous silicon (PSi) substrate using hydrothermal immersion method. Different post-annealing temperatures were varied from 300°C to 600°C. Surface morphology was studied by field emission scanning electron microscopy. It shows that a better shape was produce at annealing temperatures of 500°C. Structural studies of ZnO nanostructure were implemented using X-ray diffraction grating. The result shows post-annealing can influence the crystallinty of ZnO. Photoluminescence spectra were used to study the optical properties of ZnO nanostructure. The result shows that peak corresponds to ZnO nanostructures are appeared in UV range. Besides, broad peaks are also appeared in visible range which is attributed to structural defects and PSi substrate.

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Karar, N. « Photoluminescence from doped ZnS nanostructures ». Solid State Communications 142, n^o 5 (mai 2007) : 261–64. http://dx.doi.org/10.1016/j.ssc.2007.02.023.

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Empedocles, S. A., R. Neuhauser, K. Shimizu et M. G. Bawendi. « Photoluminescence from Single Semiconductor Nanostructures ». Advanced Materials 11, n^o 15 (octobre 1999) : 1243–56. http://dx.doi.org/10.1002/(sici)1521-4095(199910)11:15<1243 ::aid-adma1243>3.0.co;2-2.

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Wang, Chih-Chiang, Chia-Lun Lu, Fuh-Sheng Shieu et Han C. Shih. « Structure and Photoluminescence Properties of Thermally Synthesized V2O5 and Al-Doped V2O5 Nanostructures ». Materials 14, n^o 2 (13 janvier 2021) : 359. http://dx.doi.org/10.3390/ma14020359.

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Al-free and Al-doped V2O5 nanostructures were synthesized by a thermal-chemical vapor deposition (CVD) process on Si(100) at 850 °C under 1.2 × 10−1 Torr via a vapor-solid (V-S) mechanism. X-ray diffraction (XRD), Raman, and high-resolution transmission electron microscopy (HRTEM) confirmed a typical orthorhombic V2O5 with the growth direction along [110]-direction of both nanostructures. Metallic Al, rather than Al3+-ion, was detected by X-ray photoelectron spectroscopy (XPS), affected the V2O5 crystallinity. The photoluminescence intensity of V2O5 nanostructure at 1.77 and 1.94 eV decreased with the increasing Al-dopant by about 61.6% and 59.9%, attributing to the metallic Al intercalated between the V2O5-layers and/or filled in the oxygen vacancies, which behaved as electron sinks. Thus the Al-doped V2O5 nanostructure shows the potential applications in smart windows and the electrodic material in a Li-ion battery.

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Abdellatif, Mohamed H., Marco Salerno, Gaser N. Abdelrasoul, Ioannis Liakos, Alice Scarpellini, Sergio Marras et Alberto Diaspro. « Effect of Anderson localization on light emission from gold nanoparticle aggregates ». Beilstein Journal of Nanotechnology 7 (16 décembre 2016) : 2013–22. http://dx.doi.org/10.3762/bjnano.7.192.

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The localization of light known as Anderson localization is a common phenomenon characterizing aggregates of metallic nanostructures. The electromagnetic energy of visible light can be localized inside nanostructures below the diffraction limit by converting the optical modes into nonradiative surface plasmon resonances. The energy of the confined photons is correlated to the size and shape of the nanostructured system. In this work, we studied the photoluminescence dependence of aggregates of 14 nm diameter gold nanoparticles (AuNPs) synthesized by drop-casting a liquid suspension on two different substrates of glass and quartz. The AuNP aggregates were characterized by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The dielectric constant of the surrounding medium plays a crucial role in determining the aggregate geometry, which affects the Anderson localization of light in the aggregates and hence causes a red-shift in the plasmonic resonance and in the photoluminescence emission. The geometry of the gold nanoparticle aggregates determine the strength of the Anderson localization, and hence, the light emission from the aggregates. The photoluminescence lifetime was found to be dependent on the AuNP aggregate geometry and the dielectric constant of the medium.

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Seyghalkar, Hamideh, Mohammad Sabet et Masoud Salavati-Niasari. « Simple Thermal Decompose Method for Synthesis of Nickel Disulfide Nanostructures ». High Temperature Materials and Processes 35, n^o 10 (1 novembre 2016) : 1017–19. http://dx.doi.org/10.1515/htmp-2015-0169.

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AbstractIn this work, a simple thermal decompose method was served to synthesize NiS2 nanostructures via a nickel complex. Also polyethylene glycol (PEG) was used as surfactant to increase the steric effect around nanostructure surfaces and decrease the particles size. The product was characterized with different analysis methods. The crystal structure of the product was studied by X-ray diffraction (XRD) pattern. The particle size and morphology were investigated by scanning electron microscopy (SEM). To study the nanostructures surface purity, Fourier transform infrared spectroscopy (FT-IR) was used. And finally to study the optical properties of the product photoluminescence (PL) spectroscopy was served.

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WANG, PYINGHUA, XINGCHANG WANG, AIHUA WANG, BINGLIN ZHANG, YONGTIAO TIAN et NING YAO. « SYNTHESIS AND OPTICAL PROPERTIES OF THE MULTILAYER STARLIKE ZnO NANOSTRUCTURES ». International Journal of Modern Physics B 25, n^o 08 (30 mars 2011) : 1143–48. http://dx.doi.org/10.1142/s0217979211058389.

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A novel multilayer starlike ZnO nanostructure has been successfully synthesized on a Si (111) substrate at 600°C by chemical vapor deposition using Zn and zinc acetate dihydrate as the source materials. The morphology, structure, and optical properties are investigated by field emission scanning electron microscopy, X-ray diffraction, Raman and photoluminescence (PL) spectrum, respectively. The results show that the multilayer starlike ZnO nanostructures have hexagonal wurtzite structure. The room-temperature PL spectrum shows the dominant green band peak and the weak UV peak. The possible growth mechanism of the multilayer starlike ZnO nanostructures is also discussed.

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Rajbongshi, Himanshu, et Dipjyoti Kalita. « Morphology-Dependent Photocatalytic Degradation of Organic Pollutant and Antibacterial Activity with CdS Nanostructures ». Journal of Nanoscience and Nanotechnology 20, n^o 9 (1 septembre 2020) : 5885–95. http://dx.doi.org/10.1166/jnn.2020.18552.

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Efficient removal of organic pollutants from waste water by nanostructured photocatalysts has become an emerging research due to its importance in environmental remediation. Herein, CdS nanostructures with different morphologies i.e., spherical, nanopetal and rose-like have been synthesized by wet chemical method using TEA as a structure directing agent. The morphology, crystal structure, composition, surface area and optical properties of the nanostructures are investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), Brunauer-Emment-Teller (BET) analyser, Ultraviolet-Visible (UV-Vis) absorption spectroscopy and Photoluminescence (PL) spectroscopy. XRD patterns indicate the existence of hexagonal phase of CdS in all the three morphologies. The SEM images confirm the morphological transformation of spherical CdS nanoparticles (NPs) to nanopetal and rose-like morphology with the increase in concentration of TEA in the synthesis process. UV-visible absorption spectra show that rose-like CdS nanostructure exhibits red-shift of absorption wavelength compared to spherical and nanopetal CdS nanostructures. The increase in intensity of PL peak of rose-like CdS at 576.6 nm compared to that of spherical and nanopetal CdS, confirms the presence of more S vacancies or defect states. The BET specific surface areas of spherical, nanopetal and rose-like CdS nanostructures are determined to be 4.18, 6.64 and 8.93 m2/g, respectively. The EIS Nyquist plot confirms the higher electron transfer efficiency of rose-like CdS than that of spherical and nanopetal CdS. The photocatalytic activity of these three nanostructures are evaluated for the degradation of methylene blue (MB) dye in water solution under sunlight irradiation. Among the three structures, rose-like CdS nanostructure shows highest photocatalytic efficiency (96.5%) under sunlight irradiation within 120 min of sunlight irradiation. Antibacterial activity of the synthesized CdS nanostructures is performed against two Gram-positive and Gram-negative bacteria and rose-like CdS shows more activity against both types of bacteria than that of spherical and nanopetal CdS.

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Ibrahim, Kejeen M., Wasan R. Saleh et Abdulkareem M. A. Al-Sammarraie. « Structural and Optical Properties of ZnO Nanostructures Synthesized by Hydrothermal Method at Different Conditions ». Nano Hybrids and Composites 35 (5 avril 2022) : 75–83. http://dx.doi.org/10.4028/p-0w806z.

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ZnO nanostructures were synthesized by hydrothermal method at different temperatures and growth times. The effect of increasing the temperature on structural and optical properties of ZnO were analyzed and discussed. The prepared ZnO nanostructures were characterized by X-ray diffraction (XRD), UV–Vis. absorption spectroscopy (UV–Vis.), Photoluminescence (PL), and scanning electron microscopy (SEM). In this work, hexagonal crystal structure prepared ZnO nanostructures was observed using X-ray diffraction (XRD) and the average crystallite size equal 14.7 and 23.8 nm for samples synthesized at growth time 7 and 8 hours respectively. A nanotubes-shaped surface morphology was found using scanning electron microscopy (SEM). The optical properties showed that the samples had good absorbance in the UV-Vis. region and wide band gap. The PL spectrum displayed that the intensity of ultraviolet (UV), band gap and defect bands depend on the growth temperature of the ZnO nanostructure. The largest band gap was 3.351 eV for ZnO nanostructure synthesized at 100 °C and growth time 8h.

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Chen, Cheng-Ying, Ming-Wei Chen, Jr-Jian Ke, Chin-An Lin, José R. D. Retamal et Jr-Hau He. « Surface effects on optical and electrical properties of ZnO nanostructures ». Pure and Applied Chemistry 82, n^o 11 (6 août 2010) : 2055–73. http://dx.doi.org/10.1351/pac-con-09-12-05.

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This article presents a comprehensive review of the current research addressing the surface effects on physical properties and potential applications of nanostructured ZnO. Studies illustrating the transport, photoluminescence (PL), and photoconductivity properties of ZnO with ultrahigh surface-to-volume (S/V) ratio are reviewed first. Secondly, we examine recent studies of the applications of nanostructured ZnO employing the surface effect on gas/chemical sensing, relying on a change of conductivity via electron trapping and detrapping process at the surfaces of nanostructures. Finally, we comprehensively review the photovoltaic (PV) application of ZnO nanostructures. The ultrahigh S/V ratios of nanostructured devices suggest that studies on the synthesis and PV properties of various nanostructured ZnO for dye-sensitized solar cells (DSSCs) offer great potential for high efficiency and low-cost solar cell solutions. After surveying the current literature on the surface effects on nano-structured ZnO, we conclude this review with personal perspectives on a few surface-related issues that remain to be addressed before nanostructured ZnO devices can reach their ultimate potential as a new class of industrial applications.

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Qin, Tian, Timothy Gutu, Jun Jiao, Chih-Hung Chang et Gregory L. Rorrer. « Photoluminescence of Silica Nanostructures from Bioreactor Culture of Marine Diatom Nitzschia frustulum ». Journal of Nanoscience and Nanotechnology 8, n^o 5 (1 mai 2008) : 2392–98. http://dx.doi.org/10.1166/jnn.2008.241.

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The marine diatom Nitzschia frustulum is a single-celled photosynthetic organism that uses soluble silicon as the substrate to fabricate intricately patterned silica shells called frustules consisting of 200 nm diameter pores in a rectangular array. Controlled photobioreactor cultivation of the N. frustulum cell suspension to silicon starvation induced changes in the nanostructure of the diatom frustule, which in turn imparted blue photoluminescence (PL) to the frustule biosilica. The photoluminescent properties were imbedded within a patterned substrate precisely ordered at the nano, submicron and microscales. The peak PL intensity increased by a factor of 18 from the mid-exponential to late stationary phase of the cultivation cycle, and the peak PL wavelength increased from 440 to 500 nm. TEM analysis revealed that the emergence of blue photoluminescence was associated with the appearance of fine structures on the frustule surface, including 5 nm nanopore arrays lining the base of the frustule pores, which were only observed at the late stationary phase when both silicon consumption and cell division were complete for two photoperiods. Photoluminescence was quenched by thermal annealing of diatom biosilica in air at 800 °C for 1.0 hr, commensurate with the loss of silanol (≡Si-OH)groups on the diatom biosilica, as confirmed by FT-IR. Consequently, the likely origin of blue photoluminescence in the diatom biosilica was from surface silanol groups and their distribution on the frustule fine structures.

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Skobeeva, V. M., V. A. Smyntyna, M. I. Kiose et N. V. Malushin. « INCREASING THE PHOTOLUMINESCENCE EFFICIENCY OF CdS NC GROWN IN A GELATINOUS ENVIRONMENT ». Sensor Electronics and Microsystem Technologies 18, n^o 1 (31 mars 2021) : 10–19. http://dx.doi.org/10.18524/1815-7459.2021.1.227406.

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The optical and luminescent properties of nanostructures of CdS / ZnS QDs and CdS QDs doped with lithium, obtained by the sol-gel technology in an aqueous solution of gelatin, have been studied. It was determined from the optical absorption spectra of the CdS / ZnS QD nanostructures that the thickness of the shell layer corresponds to the thickness of one ZnS monolayer. The luminescence spectra revealed a significant increase in the intensity of luminescence nanostructure. The absorption spectra of undoped and doped CdS NCs coincide, which indicates that there is no change in the NC size and the absence of the formation of a lithium-sulfur compound. The luminescence spectra of lithium-doped QDs demonstrate an increase in the luminescence intensity, which is associated with the passivation of surface states.

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Millán, Brenda Carolina Pérez, César Eduardo Cea Montufar, Fabián Mendoza Hernández et Erasto Vergara Hernández. « Photoluminescence of Silver-Doped ZnO Nanostructures ». Key Engineering Materials 945 (19 mai 2023) : 11–16. http://dx.doi.org/10.4028/p-64j9qy.

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The present work reviews the results of the photoluminescence (PL) study of silver-doped ZnO nanostructures synthesized by both physical and chemical methods. ZnO is a semiconductor with a binding energy of 60 meV, which ensures efficient near-band-edge band emission at a temperature of 300K and ultraviolet emission of bulk ZnO, and ZnO has a bandgap energy of 3.37 eV at room temperature. By tuning the growth process parameters of silver-doped ZnO nanostructures, the optical properties of ZnO can be controlled for use in various optoelectronic components, biosensors, blue-emitting diodes, and even white light sensors.

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Bakhsh, Allah, Iftikhar Hussain Gul, Ashari Maqsood, Shang Hsuan Wu, Ching Hsiang Chan et Yia Chung Chang. « Effect of High Substrate Temperature on Morphology, Structural and Optical Properties of CdZnS Nanostructures ». Materials Science Forum 886 (mars 2017) : 24–31. http://dx.doi.org/10.4028/www.scientific.net/msf.886.24.

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One-dimensional CdZnS nanostructures have been synthesized through the sublimation. Effect of high substrate temperature on morphology, structural and optical properties of these nanostructures has been studied. X-Ray diffraction peak intensity, lattice parameters, crystallite size decreased with an increase in substrate temperature. The morphology changed with the increase in the substrate temperature. Raman Spectroscopy confirmed the existence of constituent elements in CdZnS solid solution and an increase of Zn concentration with the rise in substrate temperature. The nanostructures exhibited strong photoluminescence emission in the green light region with a substrate temperature-dependent blue shift of 53 meV in emission energy. The Stoke’s shift energy raised from 45 meV to 302 meV as the substrate temperature increased from 510 °C to 550 °C. The stoichiometric deviancies, crystallite size, and quantum confinement effects resulted into an increase in the optical band gap from 2.4 eV to 2.71 eV. The results showed that CdZnS nanostructures could be potential candidates for nanostructure based optoelectronics and photovoltaic devices.

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Li, C. P., L. Guo, Z. Y. Wu, L. R. Ren, X. C. Ai, J. P. Zhang, Y. Z. Lv, H. B. Xu et D. P. Yu. « Photoluminescence and time-resolved photoluminescence of star-shaped ZnO nanostructures ». Solid State Communications 139, n^o 7 (août 2006) : 355–59. http://dx.doi.org/10.1016/j.ssc.2006.06.029.

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Redman, D. A., D. M. Follstaedt, T. R. Guilinger et M. J. Kelly. « Photoluminescence and passivation of silicon nanostructures ». Applied Physics Letters 65, n^o 19 (7 novembre 1994) : 2386–88. http://dx.doi.org/10.1063/1.113036.

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Luo, Hu, Rongming Wang, Yanhui Chen, Daniel Fox, Robert O'Connell, Jing Jing Wang et Hongzhou Zhang. « Enhanced photoluminescence from SiOx–Au nanostructures ». CrystEngComm 15, n^o 46 (2013) : 10116. http://dx.doi.org/10.1039/c3ce41455h.

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Kwok, W. M., A. B. Djurišić, Y. H. Leung, W. K. Chan et D. L. Phillips. « Time-resolved photoluminescence from ZnO nanostructures ». Applied Physics Letters 87, n^o 22 (28 novembre 2005) : 223111. http://dx.doi.org/10.1063/1.2137456.

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Rodrigues, J., N. Ben Sedrine, M. R. Correia et T. Monteiro. « Photoluminescence investigations of ZnO micro/nanostructures ». Materials Today Chemistry 16 (juin 2020) : 100243. http://dx.doi.org/10.1016/j.mtchem.2020.100243.

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XU Tian-ning, 徐天宁, 李佳 LI Jia, 李翔 LI Xiang, 隋成华 SUI Cheng-hua et 吴惠桢 WU Hui-zhen. « Photoluminescence Enhancement from Ag/ZnO Nanostructures ». Chinese Journal of Luminescence 35, n^o 4 (2014) : 404–8. http://dx.doi.org/10.3788/fgxb20143504.0404.

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Chen, Haitao, Yipei Hu et Xianghua Zeng. « Green photoluminescence mechanism in ZnS nanostructures ». Journal of Materials Science 46, n^o 8 (14 décembre 2010) : 2715–19. http://dx.doi.org/10.1007/s10853-010-5141-9.

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Chen, H. T., X. L. Wu, S. J. Xiong, W. C. Zhang et J. Zhu. « Red photoluminescence mechanism in SnO2 nanostructures ». Applied Physics A 97, n^o 2 (11 avril 2009) : 365–68. http://dx.doi.org/10.1007/s00339-009-5217-z.

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Sharma, Shivani, Shubham Bhagat, Jasvir Singh, Manzoor Ahmad et Sandeep Sharma. « Temperature dependent photoluminescence from WS2 nanostructures ». Journal of Materials Science : Materials in Electronics 29, n^o 23 (6 octobre 2018) : 20064–70. http://dx.doi.org/10.1007/s10854-018-0137-3.

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Yang, Yang, Ruhao Pan, Shibing Tian, Changzhi Gu et Junjie Li. « Plasmonic Hybrids of MoS2 and 10-nm Nanogap Arrays for Photoluminescence Enhancement ». Micromachines 11, n^o 12 (15 décembre 2020) : 1109. http://dx.doi.org/10.3390/mi11121109.

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Monolayer MoS2 has attracted tremendous interest, in recent years, due to its novel physical properties and applications in optoelectronic and photonic devices. However, the nature of the atomic-thin thickness of monolayer MoS2 limits its optical absorption and emission, thereby hindering its optoelectronic applications. Hybridizing MoS2 by plasmonic nanostructures is a critical route to enhance its photoluminescence. In this work, the hybrid nanostructure has been proposed by transferring the monolayer MoS2 onto the surface of 10-nm-wide gold nanogap arrays fabricated using the shadow deposition method. By taking advantage of the localized surface plasmon resonance arising in the nanogaps, a photoluminescence enhancement of ~20-fold was achieved through adjusting the length of nanogaps. Our results demonstrate the feasibility of a giant photoluminescence enhancement for this hybrid of MoS2/10-nm nanogap arrays, promising its further applications in photodetectors, sensors, and emitters.

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Mohd Bakhori, Siti Khadijah, Chuo Ann Ling et Shahrom Mahmud. « Effects of Annealing Treatment on Structural, Optical and Morphology Characteristics of ZnO Nanostructures ». Advanced Materials Research 626 (décembre 2012) : 967–70. http://dx.doi.org/10.4028/www.scientific.net/amr.626.967.

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The ZnO nanostructure produced by CFCO or French process were undergone annealing treatment at 700°C in oxygen and nitrogen ambient. Subsequently, the characteristics of structural, optical and morphology of ZnO nanostructures were investigated using X-ray diffraction (XRD), photoluminescence (PL) and transmission electron microscopy (TEM) respectively. The crystallite size of the nanostructures were calculated from full width half maximum (FWHM) of (101) peak in XRD patterns and the size is around 42 nm. PL measuremment were carried out and the near band edge emission (NBE) is increase in wavelength or namely redshifted. Moreover, deep band emission (DBE) is observed at 520 nm for ZnO annealed in nitrogen, which commonly regarded as the defect level of oxygen vacancies. The investigation continues with conducting transmission electron microscopy (TEM) to demonstrate the mophology of as grown nanostructures and annealed in both nitrogen and oxygen ambient.

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Wang, Yan Tao, et Rui Li. « Control on the Photoluminescence of ZnO Nanostructures Synthesized by a Reverse Micellar Route ». Advanced Materials Research 621 (décembre 2012) : 153–56. http://dx.doi.org/10.4028/www.scientific.net/amr.621.153.

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ZnO nanostructures with controlable properties were synthesized by a reverse micellar system. The morphology and photoluminescence of ZnO nanostructures can be controlled by changing the the ratio of reaction Zn(NO3)2 and MEA. As the ratio of MEA/ Zn(NO3)2 is low, ZnO nanodots were generated with strong blue emission; as the ratio of MEA/ Zn(NO3)2 is increased, the formation of ZnO nanorods with green emission were synthesized. Since the photoluminescence (PL) properties could be adjusted by varying the nanostructures, these ZnO materials have high potential on different applications, for instance, as fluorescence probes.

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