Gotowe bibliografie tematyczne / Functional Noble Metal Nanoparticle

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Gotowa bibliografia na temat „Functional Noble Metal Nanoparticle”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Functional Noble Metal Nanoparticle"

Kimura, Keisaku, i Thalappil Pradeep. "Functional noble metal nanoparticle superlattices grown at interfaces". Physical Chemistry Chemical Physics 13, nr 43 (2011): 19214. http://dx.doi.org/10.1039/c1cp22279a.

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Borodaenko, Yulia, Evgeniia Khairullina, Aleksandra Levshakova, Alexander Shmalko, Ilya Tumkin, Stanislav Gurbatov, Aleksandr Mironenko i in. "Noble-Metal Nanoparticle-Embedded Silicon Nanogratings via Single-Step Laser-Induced Periodic Surface Structuring". Nanomaterials 13, nr 8 (7.04.2023): 1300. http://dx.doi.org/10.3390/nano13081300.

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Here, we show that direct femtosecond laser nanostructuring of monocrystalline Si wafers in aqueous solutions containing noble-metal precursors (such as palladium dichloride, potassium hexachloroplatinate, and silver nitrate) allows for the creation of nanogratings decorated with mono- (Pd, Pt, and Ag) and bimetallic (Pd-Pt) nanoparticles (NPs). Multi-pulse femtosecond-laser exposure was found to drive periodically modulated ablation of the Si surface, while simultaneous thermal-induced reduction of the metal-containing acids and salts causes local surface morphology decoration with functional noble metal NPs. The orientation of the formed Si nanogratings with their nano-trenches decorated with noble-metal NPs can be controlled by the polarization direction of the incident laser beam, which was justified, for both linearly polarized Gaussian and radially (azimuthally) polarized vector beams. The produced hybrid NP-decorated Si nanogratings with a radially varying nano-trench orientation demonstrated anisotropic antireflection performance, as well as photocatalytic activity, probed by SERS tracing of the paraaminothiophenol-to-dimercaptoazobenzene transformation. The developed single-step maskless procedure of liquid-phase Si surface nanostructuring that proceeds simultaneously with the localized reduction of noble-metal precursors allows for the formation of hybrid Si nanogratings with controllable amounts of mono- and bimetallic NPs, paving the way toward applications in heterogeneous catalysis, optical detection, light harvesting, and sensing.

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Abbasi, Zeeshan, Wajeeha Saeed, Syed Marifat Shah, Sohail Anjum Shahzad, Muhammad Bilal, Abdul Faheem Khan i Ahson Jabbar Shaikh. "Binding efficiency of functional groups towards noble metal surfaces using graphene oxide – metal nanoparticle hybrids". Colloids and Surfaces A: Physicochemical and Engineering Aspects 611 (luty 2021): 125858. http://dx.doi.org/10.1016/j.colsurfa.2020.125858.

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Cheng, Kang, Luc C. J. Smulders, Lars I. van der Wal, Jogchum Oenema, Johannes D. Meeldijk, Nienke L. Visser, Glenn Sunley i in. "Maximizing noble metal utilization in solid catalysts by control of nanoparticle location". Science 377, nr 6602 (8.07.2022): 204–8. http://dx.doi.org/10.1126/science.abn8289.

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Maximizing the utilization of noble metals is crucial for applications such as catalysis. We found that the minimum loading of platinum for optimal performance in the hydroconversion of n -alkanes for industrially relevant bifunctional catalysts could be reduced by a factor of 10 or more through the rational arranging of functional sites at the nanoscale. Intentionally depositing traces of platinum nanoparticles on the alumina binder or the outer surface of zeolite crystals, instead of inside the zeolite crystals, enhanced isomer selectivity without compromising activity. Separation between platinum and zeolite acid sites preserved the metal and acid functions by limiting micropore blockage by metal clusters and enhancing access to metal sites. Reduced platinum nanoparticles were more active than platinum single atoms strongly bonded to the alumina binder.

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Li, Yunxing, Yuhua Hu, Sunjie Ye, Yan Wu, Cheng Yang i Likui Wang. "Functional polyaniline-assisted decoration of polystyrene microspheres with noble metal nanoparticles and their enhanced catalytic properties". New Journal of Chemistry 40, nr 12 (2016): 10398–405. http://dx.doi.org/10.1039/c6nj02200f.

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Lin, Xia, Fan Zou, Xinzhu Chen i Bin Tang. "Functional modification of Nylon fabrics based on noble metal nanoparticles". IOP Conference Series: Materials Science and Engineering 231 (wrzesień 2017): 012175. http://dx.doi.org/10.1088/1757-899x/231/1/012175.

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Zou, Yiming, Ronn Goei, Su-Ann Ong, Amanda Jiamin ONG, Jingfeng Huang i Alfred Iing Yoong TOK. "Development of Core-Shell Rh@Pt and Rh@Ir Nanoparticle Thin Film Using Atomic Layer Deposition for HER Electrocatalysis Applications". Processes 10, nr 5 (18.05.2022): 1008. http://dx.doi.org/10.3390/pr10051008.

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The efficiency of hydrogen gas generation via electrochemical water splitting has been mostly limited by the availability of electrocatalyst materials that require lower overpotentials during the redox reaction. Noble metals have been used extensively as electrocatalysts due to their high activity and low overpotentials. However, the use of single noble metal electrocatalyst is limited due to atomic aggregation caused by its inherent high surface energy, which results in poor structural stability, and, hence, poor electrocatalytic performance and long-term stability. In addition, using noble metals as electrocatalysts also causes the cost to be unnecessarily high. These limitations in noble metal electrocatalysts could be enhanced by combining two noble metals in a core-shell structure (e.g., Rh@Ir) as a thin film over a base substrate. This could significantly enhance electrocatalytic activity due to the following: (1) the modification of the electronic structure, which increases electrical conductivity; (2) the optimization of the adsorption energy; and (3) the introduction of new active sites in the core-shell noble metal structure. The current state-of-the-art employs physical vapor deposition (PVD) or other deposition techniques to fabricate core-shell noble metals on flat 2D substrates. This method does not allow 3D substrates with high surface areas to be used. In the present work, atomic layer deposition (ALD) was used to fabricate nanoparticle thin films of Rh@Ir and Rh@Pt in a core-shell structure on glassy carbon electrodes. ALD enables the fabrication of nanoparticle thin film on three-dimensional substrates (a 2D functional film on a 3D substrate), resulting in a significantly increased surface area for a catalytic reaction to take place; hence, improving the performance of electrocatalysis. The Rh@Pt (with an overpotential of 139 mV and a Tafel slope of 84.8 mV/dec) and Rh@Ir (with an overpotential of 169 mV and a Tafel slope of 112 mV/dec) core-shell electrocatalyst exhibited a better electrocatalytic performances compared to the single metal Rh electrocatalyst (with an overpotential of 300 mV and a Tafel slope of 190 mV/dec). These represented a 54% and a 44% improvement in performance, respectively, illustrating the advantages of core-shell thin film nanostructures in enhancing the catalytic performance of an electrocatalyst. Both electrocatalysts also exhibited good long-term stability in the harsh acidic electrolyte conditions when subjected to chronopotentiometry studies.

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Bosch-Navarro, Concha, Jonathan P. Rourke i Neil R. Wilson. "Controlled electrochemical and electroless deposition of noble metal nanoparticles on graphene". RSC Advances 6, nr 77 (2016): 73790–96. http://dx.doi.org/10.1039/c6ra14836k.

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Electrodeposition is a powerful tool for forming functional composites with graphene. Indeed, noble metal nanoparticles can be directly electrodeposited onto graphene, and their size and number density can be easily controlled.

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Hughes, Zak E., i Tiffany R. Walsh. "Non-covalent adsorption of amino acid analogues on noble-metal nanoparticles: influence of edges and vertices". Physical Chemistry Chemical Physics 18, nr 26 (2016): 17525–33. http://dx.doi.org/10.1039/c6cp02323a.

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First-principles calculations on nanoscale-sized noble metal nanoparticles demonstrate that planes, edges and vertices show different noncovalent adsorption propensities depending on the adsorbate functional group.

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An, Xingda, Ayan Majumder, James McNeely, Jialing Yang, Taranee Puri, Zhiliang He, Taimeng Liang, John K. Snyder, John E. Straub i Björn M. Reinhard. "Interfacial hydration determines orientational and functional dimorphism of sterol-derived Raman tags in lipid-coated nanoparticles". Proceedings of the National Academy of Sciences 118, nr 33 (13.08.2021): e2105913118. http://dx.doi.org/10.1073/pnas.2105913118.

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Lipid-coated noble metal nanoparticles (L-NPs) combine the biomimetic surface properties of a self-assembled lipid membrane with the plasmonic properties of a nanoparticle (NP) core. In this work, we investigate derivatives of cholesterol, which can be found in high concentrations in biological membranes, and other terpenoids, as tunable, synthetic platforms to functionalize L-NPs. Side chains of different length and polarity, with a terminal alkyne group as Raman label, are introduced into cholesterol and betulin frameworks. The synthesized tags are shown to coexist in two conformations in the lipid layer of the L-NPs, identified as “head-out” and “head-in” orientations, whose relative ratio is determined by their interactions with the lipid–water hydrogen-bonding network. The orientational dimorphism of the tags introduces orthogonal functionalities into the NP surface for selective targeting and plasmon-enhanced Raman sensing, which is utilized for the identification and Raman imaging of epidermal growth factor receptor–overexpressing cancer cells.

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Rozprawy doktorskie na temat "Functional Noble Metal Nanoparticle"

Weerawardene, K. L. Dimuthu M. "Optical and luminescence properties of noble metal nanoparticles". Diss., Kansas State University, 2017. http://hdl.handle.net/2097/38189.

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Doctor of Philosophy
Department of Chemistry
Christine M. Aikens
The remarkable optical and luminescence properties of noble metal nanoparticles (with diameters < 2 nm) attract researchers due to potential applications in biomedicine, photocatalysis, and optoelectronics. Extensive experimental investigations on luminescence properties of thiolate-protected gold and silver nanoclusters during the past decade have failed to unravel their exact photoluminescence mechanism. Herein, density functional and time-dependent density functional theory (DFT and TDDFT) calculations are performed to elucidate electronic-level details of several such systems upon photoexcitation. Multiple excited states are found to be involved in photoemission from Au₂₅(SR)₁₈– nanoclusters, and their energies agree well with experimental emission energies. The Au₁₃ core-based excitations arising due to electrons excited from superatom P orbitals into the lowest two superatom D orbitals are responsible for all of these states. The large Stokes shift is attributed to significant geometrical and electronic structure changes in the excited state. The origin of photoluminescence of Ag₂₅(SR)₁₈– nanoclusters is analogous to their gold counterparts and heteroatom doping of each cluster with silver and gold correspondingly does not affect their luminescence mechanism. Other systems have been examined in this work to determine how widespread these observations are. We observe a very small Stokes shift for Au₃₈(SH)₂₄ that correlates with a relatively rigid structure with small bond length changes in its Au₂₃ core and a large Stokes shift for Au₂₂(SH)₁₈ with a large degree of structural flexibility in its Au₇ core. This suggests a relationship between the Stokes shift of gold−thiolate nanoparticles and their structural flexibility upon photoexcitation. The effect of ligands on the geometric structure and optical properties of the Au₂₀(SR)₁₆ nanocluster is explored. Comparison of the relative stability and optical absorption spectra suggests that this system prefers the [Au₇(Au₈SR₈)(Au₃SR₄)(AuSR₂)₂] structure regardless of whether aliphatic or aromatic ligands are employed. The real-time (RT) TDDFT method is rapidly gaining prominence as an alternative approach to capture optical properties of molecular systems. A systematic benchmark study is performed to demonstrate the consistency of linear-response (LR) and RT-TDDFT methods for calculating the optical absorption spectra of a variety of bare gold and silver nanoparticles with different sizes and shapes.

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Guidez, Emilie Brigitte. "Quantum mechanical origin of the plasmonic properties of noble metal nanoparticles". Diss., Kansas State University, 2014. http://hdl.handle.net/2097/17314.

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Doctor of Philosophy
Department of Chemistry
Christine M. Aikens
Small silver and gold clusters (less than 2 nm) display a discrete absorption spectrum characteristic of molecular systems whereas larger particles display a strong, broad absorption band in the visible. The latter feature is due to the surface plasmon resonance, which is commonly explained by the collective dipolar motion of free electrons across the particle, creating charged surface states. The evolution between molecular properties and plasmon is investigated. Time-dependent density functional theory (TDDFT) calculations are performed to study the absorption spectrum of cluster-size silver and gold nanorods. The absorption spectrum of these silver nanorods exhibits high-intensity longitudinal and transverse modes (along the long and short axis of the nanorod respectively), similar to the plasmons observed experimentally for larger nanoparticles. These plasmon modes result from a constructive addition of the dipole moments of nearly degenerate single-particle excitations. The number of single-particle transitions involved increases with increasing system size, due to the growing density of states available. Gold nanorods exhibit a broader absorption spectrum than their silver counterpart due to enhanced relativistic effects, affecting the onset of the longitudinal plasmon mode. The high-energy, high-intensity beta-peak of acenes also results from a constructive addition of single-particle transitions and I show that it can be assigned to a plasmon. I also show that the plasmon modes of both acenes and metallic nanoparticles can be described with a simple configuration interaction (CI) interpretation. The evolution between molecular absorption spectrum and plasmon is also investigated by computing the density of states of spherical thiolate-protected gold clusters using a charge-perturbed particle-in-a-sphere model. The electronic structure obtained with this model gives good qualitative agreement with DFT calculations at a fraction of the cost. The progressive increase of the density of states with particle size observed is in accordance with the appearance of a plasmon peak. The optical properties of nanoparticles can be tuned by varying their composition. Therefore, the optical behavior of the bimetallic Au[subscript](25-n)Ag[subscript]n(SH)[subscript]18[superscript]- cluster for different values of n using TDDFT is analyzed. A large blue shift of the HOMO-LUMO absorption peak is observed with increasing silver content, in accordance with experimental results.

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Karimova, Natalia Vladimirovna. "Theoretical study of the optical properties of the noble metal nanoparticles: CD and MCD spectroscopy". Diss., Kansas State University, 2017. http://hdl.handle.net/2097/38177.

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Doctor of Philosophy
Department of Chemistry
Christine M. Aikens
Gold and silver particles with dimensions less than a nanometer possess unique characteristics and properties that are different from the properties of the bulk. They demonstrate a non–zero HOMO–LUMO gap that can reach up to 3.0 eV. These differences arise from size quantization effects in the metal core due to the small number of atoms. These nanoparticles have attracted great interest for decades both in fundamental and applied research. Small gold clusters protected by various types of ligands are of interest because ligands allow obtaining gold nanoclusters with given sizes, shapes and properties. Three main families of organic ligands are usually used for stabilization of gold nanoclusters: phosphine ligands, thiolate ligands and DNA. Usually, optical properties of these NPs are studied using optical absorption spectroscopy. Unfortunately, sometimes this type of spectrum is poorly resolved and tends to appear very similar for different complexes. In these cases, circular dichroism (CD) and magnetic circular dichroism (MCD) spectroscopy can be applied. However, the interpretation of experimental CD and MCD spectra is a complicated process. In this thesis, theoretically simulated CD and MCD spectra were combined with optical absorption spectra to study optical activity for octa– and nona– and undecanuclear gold clusters protected by mono– and bidentate phosphine ligands. Additionally, optical properties of bare and DNA protected silver NPs were studied. Theoretical CD spectra were examined to learn more about the origin of chirality in chiral organometallic complexes, and to contribute to the understanding of the difference in chiroptical activity of gold clusters stabilized by different phosphine ligands and DNA–stabilized silver clusters. Furthermore, optical properties of the small centered gold clusters Au₈(PPh₃)₈²⁺ and Au₉(PPh₃)₈³⁺ were examined by optical absorption and MCD spectra using TDDFT. Theoretical MCD spectra were also used to identify the plasmonic behavior of silver nanoparticles. These results showed that CD and MCD spectroscopy yield more detailed information about optical properties and electronic structure of the different chemical systems than optical absorption spectroscopy alone. Theoretical simulation of the CD and MCD spectra together with optical absorption spectra can be used to assist in the understanding of empirically measured CD and MCD and provide useful information about optical properties and electronic structure.

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Herrmann, Anne-Kristin. "Preparation, Processing and Characterization of Noble Metal Nanoparticle-based Aerogels". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-149672.

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New challenges in nanotechnology arise in the assembly of nanoobjects into three-dimensional superstructures, which may carry synergetic properties and open up new application fields. Within this new class of materials nanostructured, porous functional metals are of great interest since they combine high surface area, gas permeability, electrical conductivity, plasmonic behavior and size-enhanced catalytic reactivity. Even though a large variety of preparation pathways for the fabrication of porous noble metals has already been established, several limitations are still to be addressed by research developments. The new and versatile approach that is presented in this work makes use of a templatefree self-assembly process for the fabrication of highly porous, metallic nanostructures. Thereby, nanochains are formed by the controlled coalescence of noble metal NPs in aqueous media and their interconnection and interpenetration leads to the formation of a self-supported network with macroscopic dimensions. Subsequently, the supercritical drying technique is used to remove the solvent from the pores of the network without causing a collapse of the fragile structure. The resulting highly porous, low-weighted, three-dimensional nanostructured solids are named aerogels. The exceptional properties of these materials originate from the conjunction of the unique properties of nanomaterials magnified by macroscale assembly. Moreover, the combination of different metals may lead to synergetic effects regarding for example their catalytic activity. Therefore, the synthesis of multimetallic gels and the characterization of their structural peculiarities are in the focus of the investigations. In the case of the developed preparation pathways the gelation process starts from preformed, stable colloidal solutions of citrate capped, spherical noble metal (Au, Ag, Pt, Pd) NPs. In order to face various requirements several methods for the initiation of the controlled destabilization and coalescence of the nanosized building blocks were developed and synthesis conditions were optimized, respectively. Multimetallic structures with tunable composition are obtained by mixing different kinds of monometallic NP solutions and performing a joint gel formation. The characterization of the resulting materials by means of electron microscopy reveals the formation of a highly porous network of branched nanochains that provide a polycrystalline nature and diameters in the size range of the initial NPs. Furthermore, synthesis conditions for the spontaneous gel formation of glucose stabilized Au and Pd NPs were investigated. In order to gain a detailed knowledge of the structural properties of bimetallic aerogel structures a versatile set of characterization techniques was applied. A broad pore size distribution dominated by meso- and macropores and remarkably high inner surface areas were concluded from the N2 physisorption isotherms and density measurements. As investigated, a specific thermal treatment could be used to tune the ligament size of Au-Ag aerogels, whereas Au-Pd and Pt-Pd structures provide thermal stability under mild conditions. Further investigations aimed to the enlightenment of the elemental distribution and phase composition within the nanochains of multimetallic gel structures. The different approaches provide complementary and consistent results. Phase analyses based on XRD measurements revealed separated phases of each metal in the case of Ag-Pd and Au-Pd aerogels. They further proved the possibility of temperature induced phase modifications that lead to complete alloying of Au and Pd. In addition, separated domains of Pt and Pd were established from the EXAFS analysis of the corresponding aerogel. STEM EDX high resolution elemental mappings confirmed the separated domains of different metals in the case of Au-Pd and Pt-Pd aerogels. Moreover, a complete interdiffusion and alloy formation of Au and Ag within the corresponding aerogel structure is suggested from STEM EDX results. Finally, the presented investigations further promote the field of metallic aerogels by addressing the challenging issue of processability and device fabrication. Hybrid materials with organic polymers as well as various kinds of coatings on glass substrates and glassy carbon electrodes were prepared whereas the network structure was preserved throughout all processing steps. Moreover, it was illustrated that the NP-based aerogels carry metallic properties as expressed by their low Seebeck coefficients and high electrical conductivities.

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Gill, Arran Michael. "The extrusion of noble metal nanoparticle catalysts for sustainable oxidation reactions". Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/422157/.

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Through employing a combination of complimentary structural, spectroscopic and high-resolution microscopy techniques, the superior properties of a [PtCl4]2- precursor to yield well-defined, isolated nanoparticles (predominantly 2-3 nm) upon microporous framework architectures, have been established. These are prepared via a one-step, in situ methodology, within three-dimensional porous molecular architectures, to afford robust heterogeneous catalysts. The catalytic activity of these materials can be intrinsically linked to the degree of nanoparticle formation. The [PtCl4]2- precursor bestows a greater propensity for nanoparticle formation across a range of activation conditions by comparison to [PdCl4]2- and [AuCl4]- precursors. This, in concert with the surrounding microporous architecture, donates superior catalytic performance for the aerobic oxidation of KA oil to cyclohexanone (precursor for adipic acid and ε-caprolactam), under continuous flow conditions. It is able to approach unrivalled yields of >90% by adapting a ‘closed-loop’ system. Detailed spectroscopic investigations into the nature of the active sites at the molecular level, coupled with high-resolution electron microscopy, reveal that the intricacies of the synthetic methodology and associated activation procedures play a vital role in regulating the locality, morphology and size of the metal nanoparticles produced. Theseinvestigations also offer insights into the potential consequences of prolonged catalytic exposure. All three (Au, Pt & Pd) nanoparticle systems demonstrate a profound influence on the activation of molecular oxygen and alkyl peroxides for a plethora of selective catalytic oxidations. Furthermore, this design strategy offers adequate scope for the creation of multi-metallic (e.g. Pd-Cu, Au-Cu & Au-Pt), multifunctional heterogeneous catalysts, in the continued quest for the activation of molecular oxygen in sustainable catalytic processes.

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Crites, Charles-Oneil. "Investigating the Interactions between Free Radicals and Supported Noble Metal Nanoparticles in Oxidation Reactions". Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33404.

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This thesis studies the interaction between free radical species and supported noble metal nanoparticles (silver and gold) in the context of oxidation reactions. The peroxidation of cumene is the first reaction to be discussed and the difference in peroxidation product distribution using silver nanoparticles (AgNP) versus gold nanoparticles (AuNP) is examined. Specifically, cumyl alcohol is obtained as the major product obtained when using supported AuNP, whereas cumene hydroperoxide is favoured for AgNP. Such variations in product distribution are partially explained by the differences in the nanoparticle Fenton activity, where the TiO2 support was proposed to enhance such activity due to possible electron shuttling capabilities with the nanoparticle surface. Use of hydrotalcite as a support was found to minimize this characteristic, due to its insulator properties. The stability of hydroperoxide was tested in the presence of various others supports (activated carbon, Al2O3, ZnO, SiO2 and clays) with little success, with hydroperoxide exhibiting stability in the presence of HT. Using an oxygen uptake apparatus, the interaction of the cumyl peroxyl radical with the AuNP surface was demonstrated. Furthermore, this interaction promotes decomposition leading to the corresponding alkoxyl radical and subsequent hydrogen abstraction to form the observed cumyl alcohol product. The radical interaction with supported nanoparticles, and its reversibility appear different for gold and silver and accounts for a large part of the product distribution differences observed between AuNP and AgNP, as illustrated below. The peroxidation of ethylbenzene and propylbenzene was studied and revealed the participation of a reactive surface oxygen species due to the decomposition of peroxyl radicals on the nanoparticle surface. The reactive oxygen species was found to be transient in nature in the case of AuNP . Furthermore, this surface species was found to be an important participant in hydrogen abstraction leading to peroxide product formation. Finally, supported nanoparticle catalyzed tetralin peroxidation was investigated to determine the influence of temperature on the peroxidation product distribution and how changes in the reaction temperature can effect the radical-nanoparticle surface interactions.

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Near, Rachel Deanne. "Theoretical and experimental investigation of the plasmonic properties of noble metal nanoparticles". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52181.

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Noble metal nanoparticles are of great interest due to their tunable optical and radiative properties. The specific wavelength of light at which the localized surface plasmon resonance occurs is dependent upon the shape, size and composition of the particle as well as the dielectric constant of the host medium. Thus, the optical properties of noble metal nanoparticles can be systematically tuned by altering these specific parameters. The purpose of this thesis is to investigate some of these properties related to metallic nanoparticles. The first several chapters focus on theoretical modeling to predict and explain various plasmonic properties of gold and silver nanoparticles while the later chapters focus on more accurately combining experimental and theoretical methods to explain the plasmonic properties of hollow gold nanoparticles of various shapes. The appendix contains a detailed description of the theoretical methods used throughout the thesis. It is intended to serve as a guide such that a user could carry out the various types of calculations discussed in this thesis simply by reading this appendix.

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Bruzas, Ian R. "Biocompatible noble metal nanoparticle substrates for bioanalytical and biophysical analysis of protein and lipids". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553250462519941.

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JOUVE, ANDREA. "VALORISATION OF BIOMASS-DERIVED MOLECULES BY NOBLE METAL CATALYSTS". Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/710533.

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Valorisation of different biomass derived molecules was successfully approached and studied in this PhD project. The focus of the thesis was addressed to the catalysts preparation, passing through an accurate catalytic designed, to be then tested in academic and industrially appealing reactions. This approach led to the synthesis of different but equally interesting catalytic systems for the valorisation of substrates derived from the first and second generation of biomass feedstock. An extended study, at first, was conducted on the oxidation of glycerol (1st generation of biomass related), both in alkaline (needed for gold monometallic systems) and free pH (high industrial relevance) conditions. The target reaction was approached starting from the simplest Au/C catalytic systems, to finally move to more complicated and innovative materials: bimetallic once. Initially, the Au on carbon Vulcan (with the highest graphitisation degree) SOL derived catalysts showed a remarkable initial activity (IA= 1091 h-1) in comparison with the other carbonaceous supports (Norit and X40S) and the SMAD derived catalysts. This result pointed out the importance of the protecting agent (a polymer that surrounded the nanoparticles and is solely present for the SOL synthetic route) beside the importance of the support’s features. Similarly, electronic effects ascribed to the interaction with the support of the nanoparticles (i.e. the strong metal support interaction (SMSI) thermally induced on Au4Ag1/TiO2) showed to be the ruling factor to determine the oxidation state of the metals. This latter, subsequentially, influence the catalytic activity: an enhanced initial catalytic activity was detected for the Au4Ag1/TiO2 catalyst (IA= 1616 h-1), in comparison with the Au4Ag1/Al2O3 (IA= 963 h-1). The SMSI have influenced also the stability of the system, avoiding the enlargement of the nanoparticles during the thermal treatments. On the other hand, the SMSI induced the presence of Ag+ species onto the bimetallic nanoparticles titania supported, leading to a quite rapid deactivation of the catalytic system. The thermal treatments pointed out also the importance of the protecting agent (polyvinyl alcohol, PVA): on one side when it is present confers resistance to the system towards the nanoparticles aggregation, on the other when it is removed from the nanoparticles’ surface (by the same thermal treatment), the catalyst acquired an enhanced initial activity. AuPt/TiO2 catalytic systems were subsequentially exploited both in alkaline and free pH conditions. The gold content positively influenced the activity of the catalytic systems in both the conditions. In particular Au9Pt1/TiO2 was the most active catalyst in the alkaline condition (IA= 7389 h−1), and Au6Pt4/TiO2 showed the highest initial activity (IA= 301 h-1) in free pH condition. For all the bimetallic system mentioned and exploited in the valorisation of glycerol, furthermore, a synergistic effect was detected. The importance of gold as modifier to confer resistance to the catalytic system by stabilizing the oxidation state of the second metal was also established. Subsequentially, completely different designed and synthesised catalysts were prepared for the valorisation of substrates related with the 2nd generation of biomass. Bare carbon nanofibers (CNFs) and functionalised CNFs (CNFs-P, CNFs-O and CNFs-N), for instance, were employed as supports for Ru nanoparticles (introduced by incipient wet impregnation). All the catalysts prepared showed activity in the valorisation of cellulose derived molecules. In particular, it was observed how N-containing functionalisation of the support, promoted by a strong interaction with the Ru nanoparticles, led to the highest catalytic activity among the set of catalysts tested for the levulinic acid (LA) hydrogenation (88 % of conversion after 3 h) with a full selectivity to y-valerolactone (GVL). On the other side, exploring the 5-hydroxymethylfurfural (HMF) valorisation, Ru/CNF-N and Ru/CNF-P showed a lower activity but also a change in selectivity. In fact, these latter two catalysts enhanced the formation of ethers due to the reaction between 2,5-dihydroxymethylfuran and/or methylfurfuryl alcohol with the solvent (2-butanol). Similar support effects were also observed in the furfural hydrogenation over platinum nanoparticles (introduced by solvated metal atoms deposition, SMAD) supported on niobia and tailor-made modified niobia. Niobia was hydrothermally synthetized pure and doped with other two different metals (W and Ti, both 10 at.%) to tune the acidity of the system. In particular, we were able to enhance to 0.191 mmolPy/gCAT (W-Nb2O5) and decrees to 0.014 mmolPy/gCAT (Ti-Nb2O5) the acidity of the pure Niobia (0.078 mmolPy/gCAT). Platinum nanoparticles, showing a narrow particle size distribution (1.1-1.2 nm) for all the supports, have allowed a proper study of the acidity effect. The acidity, indeed, showed to be the ruling factor: the most acidic material showed the highest activity coupled with a selectivity addressed to the furan ether products (acid catalysed reaction’s step) at the expenses of furfuryl alcohol (highest selectivity of FA showed for the lowest acid catalyst). Unfortunately, the condition and the type of acidity (Lewis acidity) obtained were not sufficient to observe a high fraction of diols (target product, less than 10 % in selectivity), produced from the ring-opening of the substrate. Lastly, in the benzyl alcohol oxidation (model compound for the lignin) it was highlighted how gold-based materials characterised by comparable nanoparticles dimension (Au-Pd, Au-Pt, Au-Ru and Au-Cu, all supported on carbon) could change the catalytic behaviour and the bimetallic structure just by varying the second metal. For AuPd/C and AuPt/C, for example, alloyed structures were observed. On the other hand, for the case of Ru as second metal, a core-shell structure was found. When Cu was employed, bimetallic nanoparticles with Au:Cu molar ratio lower than the nominal one were detected suggesting the presence of segregated gold nanoparticles. All the catalysts were active and highly selective towards the desired and industrial appealing product (benzaldehyde, selectivity ≥ 99 %). Only in the case of AuPd/C and AuCu/C, however, a synergistic effect was observed. In particular, the AuPd/C bimetallic sample showed the highest activity (fully conversion of the substrate after 5 min). For the interesting Au-Cu system (the only catalysts that contain a not noble metal), furthermore, the role of the Cu was clarified and the composition effect was studied. The metals were deposited on a carbonaceous support by SMAD technique in order to avoid a protecting agent influence. More in details, it was speculated how Cu, promptly oxidised at CuO (if exposed to air), is responsible of the O2 activation, while the reaction took part at the Au-CuO interface. This reactivity is guided by a specific structure of the bimetallics particles finely characterized: Aucore-CuOshell structure. This last evidence highlighted once more the importance of having a good knowledge and control on the catalyst synthetic routes. Furthermore, synergistic effect was observed for all the active AuCu/C bimetallic systems, even when the amount of gold was very low (Au13Cu1/C, IA= 329 h-1). The highest initial activity, however, was reached with Au4Cu1/C catalysts (IA= 399 h-1). All the active AuCu bimetallic catalysts showed a high selectivity towards the desired product: benzaldehyde (≥ 95%). Good stability against deactivation was also observed. For the Cu-rich sample (Au1Cu17/C) case, distinguished by the negligible activity, it was assumed how the external copper oxide shells, by entirely covering the gold atoms, have repressed any catalytic activities.

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Sinha, Roy Rajarshi. "Ab initio simulation of optical properties of noble-metal clusters". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0017/document.

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L'intérêt de la recherche fondamentale pour les morceaux nanométriques de métaux nobles est principalement dû à la résonance localisée des plasmons de surface (LSPR) dans l'absorption optique. Différents aspects, liés à la compréhension théorique de la LSPR dans le cas de clusters de métaux nobles de taille dite intermédiaire, sont étudiés dans ce manuscrit. Afin d'avoir une vision plus large nous utilisons deux approches : l'approche électromagnétique classique et le formalisme ab initio en temps réel de la théorie de la fonctionnelle de la densité dépendant du temps (RT-TDDFT). Une comparaison systématique et détaillée de ces deux approches souligne et quantifie les limitations de l'approche électromagnétique lorsqu'elle est appliquée à des systèmes de taille quantique. Les différences entre les excitations plasmoniques collectives et celles impliquant les électrons d, ainsi que leurs interactions, sont étudiées grâce au comportement spatial des densités correspondantes. Ces densités sont obtenues en appliquant une transformée de Fourier dans l'espace à la densité obtenue par les simulations DFT utilisant une perturbation delta-kick. Dans ce manuscrit, des clusters de métaux nobles nus et protégés par des ligands sont étudiés. En particulier, motivé par de récents travaux sur les phénomènes d'émergence de plasmon, l'étude par TD-DFT de nano-alliages Au-Cu de taille tout juste inférieure à 2nm à fourni de subtiles connaissances sur les effets d'alliages sur la réponse optique de tels systèmes
The fundamental research interest in nanometric pieces of noble metals is mainly due to the localized surface-plasmon resonance (LSPR) in the optical absorption. Different aspects related to the theoretical understanding of LSPRs in `intermediate-size' noble-metal clusters are studied in this thesis. To gain a broader perspective both the real-time \ai formalism of \td density-functional theory (RT-TDDFT) and the classical electromagnetics approach are employed. A systematic and detailed comparison of these two approaches highlights and quantifies the limitations of the electromagnetics approach when applied to quantum-sized systems. The differences between collective plasmonic excitations and the excitations involving $d$-electrons, as well as the interplay between them are explored in the spatial behaviour of the corresponding induced densities by performing the spatially resolved Fourier transform of the time-dependent induced density obtained from a RT-TDDFT simulation using a $\delta$-kick perturbation. In this thesis, both bare and ligand-protected noble-metal clusters were studied. In particular, motivated by recent experiments on plasmon emergence phenomena, the TDDFT study of Au-Cu nanoalloys in the size range just below 2~nm produced subtle insights into the general effects of alloying on the optical response of these systems

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Książki na temat "Functional Noble Metal Nanoparticle"

MSIT Materials Science International Team. Noble Metal Systems. Selected Systems from Ag-Al-Zn to Rh-Ru-Sc (Landolt-Bornstein: Numerical Data and Functional Relationships in Science and Technology - New Series, Volume 11). Springer, 2006.

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Części książek na temat "Functional Noble Metal Nanoparticle"

Yang, Minghui, Jianxiu Wang i Feimeng Zhou. "Biomarker Detections Using Functional Noble Metal Nanoparticles". W ACS Symposium Series, 177–205. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1112.ch007.

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Lu, Feipeng, Shenghua Li, Jianhua Chen, Aifeng He i Yin Wang. "Novel Pyrazol-Functional Covalent Organic Framework for Noble-Metal Nanoparticles Immobilization". W Springer Proceedings in Physics, 481–93. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1774-5_36.

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Zhou, Wenjuan, i Chao Lu. "Ultra Weak Chemiluminescence Enhanced by Noble Metal Nanoparticle". W Ultra-Weak Chemiluminescence, 143–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64841-4_8.

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Zheng, Guangchao, Erjun Liang i Shenli Wang. "CHAPTER 13. Proteins Engineer the Size and Morphology of Noble Metal Nanoparticles". W Reducing Agents in Colloidal Nanoparticle Synthesis, 333–54. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839163623-00333.

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Nayak, Simantini, i Yatendra S. Chaudhary. "Catalytic Behavior of Noble Metal Nanoparticle-Metal Oxide Assemblies: An Effect of Interfacial Ligands". W Lecture Notes in Mechanical Engineering, 265–75. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-7264-5_20.

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Luo, Yunbo. "Functional Nucleic Acid Based Biosensors for Noble Metal Ion Detection". W Functional Nucleic Acid Based Biosensors for Food Safety Detection, 161–83. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8219-1_6.

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Freeman, A. J., S. Tang, S. H. Chou, Ye Ling i B. Delley. "Local Density DMOL Studies of Noble and Alkali Metal Adsorption on the Silicon Surface". W Density Functional Methods in Chemistry, 61–75. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-3136-3_5.

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Dhara, Sandip. "Surface Plasmon Polariton Assisted Optical Switching in Noble Metal Nanoparticle Systems: A Sub-Band Gap Approach". W Reviews in Plasmonics, 1–17. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24606-2_1.

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Bolla, P. A., M. A. Serradell, M. L. Casella i P. J. Peruzzo. "CHAPTER 4. Nanoarchitectonics Based on S-layer Proteins: Design of Noble Metal Nanoparticle Arrangements and Nanostructured Materials". W Nanoscience & Nanotechnology Series, 82–105. Cambridge: Royal Society of Chemistry, 2022. http://dx.doi.org/10.1039/9781788019613-00082.

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Chen, Jingyi. "Noble Metal Nanoparticle Platform". W Cancer Theranostics, 327–46. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-12-407722-5.00018-9.

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Streszczenia konferencji na temat "Functional Noble Metal Nanoparticle"

Varma, Ranjana S., D. C. Kothari, A. G. Mahadkar, N. A. Kulkarni, D. Kanjilal, P. Kumar, Dinesh K. Aswal i Anil K. Debnath. "Synthesis Of Noble Metal Nanoparticle Composite Glasses Using Low Energy Ion Beam Mixing". W INTERNATIONAL CONFERENCE ON PHYSICS OF EMERGING FUNCTIONAL MATERIALS (PEFM-2010). AIP, 2010. http://dx.doi.org/10.1063/1.3530512.

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Liu, Feng, i Jean-Michel Nunzi. "Noble metal nanoparticle enhanced organic light emitting diodes". W SPIE Photonics Europe. SPIE, 2012. http://dx.doi.org/10.1117/12.927067.

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Forcherio, Gregory T., Mourad Benamara i D. Keith Roper. "Plasmon excitation and damping in noble metal nanoparticle-MoS2 nanocomposites". W SPIE Nanoscience + Engineering, redaktorzy Stefano Cabrini, Gilles Lérondel, Adam M. Schwartzberg i Taleb Mokari. SPIE, 2016. http://dx.doi.org/10.1117/12.2237831.

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Nedyalkov, N. N., Ru G. Nikov i P. A. Atanasov. "Near field intensity enhancement and localization in noble metal nanoparticle ensembles". W Seventeenth International School on Quantum Electronics: Laser Physics and Applications, redaktorzy Tanja N. Dreischuh i Albena T. Daskalova. SPIE, 2013. http://dx.doi.org/10.1117/12.2013200.

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Inya-Agha, Obianuju, Robert J. Forster i Tia E. Keyes. "Noninvasive noble metal nanoparticle arrays for surface-enhanced Raman spectroscopy of proteins". W Biomedical Optics (BiOS) 2007, redaktorzy Tuan Vo-Dinh i Joseph R. Lakowicz. SPIE, 2007. http://dx.doi.org/10.1117/12.725068.

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Choi, Ju H., George Saddiqi, Jere A. Wilson i Regina Ragan. "Noble metal nanoparticle arrays: control of size, shape, and placement via chemical self-assembly". W Optics East 2006, redaktorzy Nibir K. Dhar, Achyut K. Dutta i M. Saif Islam. SPIE, 2006. http://dx.doi.org/10.1117/12.688409.

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Lidorikis, E., S. Egusa i J. D. Joannopoulos. "Effective optical response of noble metal nanoparticle arrays and photonic crystals with embedded nanoparticles". W 2007 Quantum Electronics and Laser Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/qels.2007.4431672.

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Sheridan, Eoin, Obianuju Inya-Agha, Tia Keyes i Robert Forster. "Electrodeposited noble metal SERS: control of single nanoparticle size and control of array interparticle spacing". W Biomedical Optics (BiOS) 2007, redaktorzy Tuan Vo-Dinh i Joseph R. Lakowicz. SPIE, 2007. http://dx.doi.org/10.1117/12.725069.

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Adams, Sarah M., i Regina Ragan. "Gold Nanoparticle Self Assembly on Diblock Copolymers for Application as Biomolecular Sensors". W ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13126.

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Current efforts in medical diagnostic technology focus toward developing biological sensors with the capacity for detecting trace quantities of specified organic molecules. In this study, metallic nanoparticles were investigated for the development of field-enhanced chemical and biological detection devices with the capacity to achieve single-molecule level detection resulting from surface enhanced Raman scattering (SERS) associated with closely spaced noble metal nanostructures.[1, 2] Localized surface plasmon resonance (LSPR) sensors likewise benefit from the incorporation of ordered metal nanoparticles on surfaces, providing increased shift in minimum of reflectivity with biological binding event (figure 1).[3]

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Yasuda, K., N. Tanaka, N. Wada i H. Nishimura. "Creation and functional control of metal nanoparticle-polymer interface by laser plasma EUV light excitation". W 2018 International Conference on Electronics Packaging and iMAPS All Asia Conference (ICEP-IAAC). IEEE, 2018. http://dx.doi.org/10.23919/icep.2018.8374644.

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Raporty organizacyjne na temat "Functional Noble Metal Nanoparticle"

Kliewer, Christopher J. In-situ Studies of the Reactions of Bifunctional and Heterocyclic Molecules over Noble Metal Single Crystal and Nanoparticle Catalysts Studied with Kinetics and Sum-Frequency Generation Vibrational Spectroscopy. Office of Scientific and Technical Information (OSTI), czerwiec 2009. http://dx.doi.org/10.2172/973607.

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