Relevant bibliographies by topics / Nanoparticles decoration

Academic literature on the topic 'Nanoparticles decoration'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Nanoparticles decoration"

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Kim, Jongwon, Seonhye Youn, Ju Young Baek, Dong Hwan Kim, Sumin Kim, Wooyoung Lee, Hee Jung Park, et al. "Modulation of Conductivity and Contact Resistance of RuO2 Nanosheets via Metal Nano-Particles Surface Decoration." Nanomaterials 11, no. 9 (September 19, 2021): 2444. http://dx.doi.org/10.3390/nano11092444.

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We studied the variation in electrical conductivity of exfoliated RuO2 nanosheets and the modulation in the contact resistance of individual nanosheet devices using charge transfer doping effects based on surface metal nanoparticle decorations. The electrical conductivity in the monolayer and bilayer RuO2 nanosheets gradually increased due to the surface decoration of Cu, and subsequently Ag, nanoparticles. We obtained contact resistances between the nanosheet and electrodes using the four-point and two-point probe techniques. Moreover, the contact resistances decreased during the surface decoration processes. We established that the surface decoration of metal nanoparticles is a suitable method for external contact engineering and the modulation of the internal properties of nanomaterials.
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Elnabawy, Hussam M., Juan Casanova-Chafer, Badawi Anis, Mostafa Fedawy, Mattia Scardamaglia, Carla Bittencourt, Ahmed S. G. Khalil, Eduard Llobet, and Xavier Vilanova. "Wet chemistry route for the decoration of carbon nanotubes with iron oxide nanoparticles for gas sensing." Beilstein Journal of Nanotechnology 10 (January 9, 2019): 105–18. http://dx.doi.org/10.3762/bjnano.10.10.

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In this work, we investigated the parameters for decorating multiwalled carbon nanotubes with iron oxide nanoparticles using a new, inexpensive approach based on wet chemistry. The effect of process parameters such as the solvent used, the amount of iron salt or the calcination time on the morphology, decoration density and nanocluster size were studied. With the proposed approach, the decoration density can be adjusted by selecting the appropriate ratio of carbon nanotubes/iron salt, while nanoparticle size can be modulated by controlling the calcination period. Pristine and iron-decorated carbon nanotubes were deposited on silicon substrates to investigate their gas sensing properties. It was found that loading with iron oxide nanoparticles substantially ameliorated the response towards nitrogen dioxide.
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Westmeier, Dana, Djamschid Solouk-Saran, Cecilia Vallet, Svenja Siemer, Dominic Docter, Hermann Götz, Linda Männ, et al. "Nanoparticle decoration impacts airborne fungal pathobiology." Proceedings of the National Academy of Sciences 115, no. 27 (June 20, 2018): 7087–92. http://dx.doi.org/10.1073/pnas.1804542115.

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Airborne fungal pathogens, predominantly Aspergillus fumigatus, can cause severe respiratory tract diseases. Here we show that in environments, fungal spores can already be decorated with nanoparticles. Using representative controlled nanoparticle models, we demonstrate that various nanoparticles, but not microparticles, rapidly and stably associate with spores, without specific functionalization. Nanoparticle-spore complex formation was enhanced by small nanoparticle size rather than by material, charge, or “stealth” modifications and was concentration-dependently reduced by the formation of environmental or physiological biomolecule coronas. Assembly of nanoparticle-spore surface hybrid structures affected their pathobiology, including reduced sensitivity against defensins, uptake into phagocytes, lung cell toxicity, and TLR/cytokine-mediated inflammatory responses. Following infection of mice, nanoparticle-spore complexes were detectable in the lung and less efficiently eliminated by the pulmonary immune defense, thereby enhancing A. fumigatus infections in immunocompromised animals. Collectively, self-assembly of nanoparticle-fungal complexes affects their (patho)biological identity, which may impact human health and ecology.
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Bruno, Luca, Vincenzina Strano, Mario Scuderi, Giorgia Franzò, Francesco Priolo, and Salvo Mirabella. "Localized Energy Band Bending in ZnO Nanorods Decorated with Au Nanoparticles." Nanomaterials 11, no. 10 (October 14, 2021): 2718. http://dx.doi.org/10.3390/nano11102718.

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Surface decoration by means of metal nanostructures is an effective way to locally modify the electronic properties of materials. The decoration of ZnO nanorods by means of Au nanoparticles was experimentally investigated and modelled in terms of energy band bending. ZnO nanorods were synthesized by chemical bath deposition. Decoration with Au nanoparticles was achieved by immersion in a colloidal solution obtained through the modified Turkevich method. The surface of ZnO nanorods was quantitatively investigated by Scanning Electron Microscopy, Transmission Electron Microscopy and Rutherford Backscattering Spectrometry. The Photoluminescence and Cathodoluminescence of bare and decorated ZnO nanorods were investigated, as well as the band bending through Mott–Schottky electrochemical analyses. Decoration with Au nanoparticles induced a 10 times reduction in free electrons below the surface of ZnO, together with a decrease in UV luminescence and an increase in visible-UV intensity ratio. The effect of decoration was modelled with a nano-Schottky junction at ZnO surface below the Au nanoparticle with a Multiphysics approach. An extensive electric field with a specific halo effect formed beneath the metal–semiconductor interface. ZnO nanorod decoration with Au nanoparticles was shown to be a versatile method to tailor the electronic properties at the semiconductor surface.
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Bruno, Luca, Mario Urso, Yosi Shacham-Diamand, Francesco Priolo, and Salvo Mirabella. "Role of Substrate in Au Nanoparticle Decoration by Electroless Deposition." Nanomaterials 10, no. 11 (November 1, 2020): 2180. http://dx.doi.org/10.3390/nano10112180.

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Decoration of nanostructures is a promising way of improving performances of nanomaterials. In particular, decoration with Au nanoparticles is considerably efficient in sensing and catalysis applications. Here, the mechanism of decoration with Au nanoparticles by means of low-cost electroless deposition (ELD) is investigated on different substrates, demonstrating largely different outcomes. ELD solution with Au potassium cyanide and sodium hypophosphite, at constant temperature (80 °C) and pH (7.5), is used to decorate by immersion metal (Ni) or semiconductor (Si, NiO) substrates, as well as NiO nanowalls. All substrates were pre-treated with a hydrazine hydrate bath. Scanning electron microscopy and Rutherford backscattering spectrometry were used to quantitatively analyze the amount, shape and size of deposited Au. Au nanoparticle decoration by ELD is greatly affected by the substrates, leading to a fast film deposition onto metallic substrate, or to a slow cluster (50–200 nm sized) formation on semiconducting substrate. Size and density of resulting Au clusters strongly depend on substrate material and morphology. Au ELD is shown to proceed through a galvanic displacement on Ni substrate, and it can be modeled with a local cell mechanism widely affected by the substrate conductivity at surface. These data are presented and discussed, allowing for cheap and reproducible Au nanoparticle decoration on several substrates.
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Müller, Elena K., Nataniel Białas, Matthias Epple, and Ingrid Hilger. "The Peptide/Antibody-Based Surface Decoration of Calcium Phosphate Nanoparticles Carrying siRNA Influences the p65 NF-κB Protein Expression in Inflamed Cells In Vitro." Biomedicines 10, no. 7 (July 1, 2022): 1571. http://dx.doi.org/10.3390/biomedicines10071571.

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Earlier studies with nanoparticles carrying siRNA were restricted to investigating the inhibition of target-specific protein expression, while almost ignoring effects related to the nanoparticle composition. Here, we demonstrate how the design and surface decoration of nanoparticles impact the p65 nuclear factor-kappa B (NF-κB) protein expression in inflamed leucocytes and endothelial cells in vitro. We prepared silica-coated calcium phosphate nanoparticles carrying encapsulated siRNA against p65 NF-κB and surface-decorated with peptides or antibodies. We show that RGD-decorated nanoparticles are efficient in down-regulating p65 NF-κB protein expression in endothelial cells as a result of an enhanced specific cellular binding and subsequent uptake of nanoparticles. In contrast, nanoparticles decorated with IgG (whether specific or not for CD69) are efficient in down-regulating p65 NF-κB protein expression in T-cells, but not in B-cells. Thus, an optimized nanoparticle decoration with xenogenic IgG may stimulate a specific cellular uptake. In summary, the composition of siRNA-loaded calcium phosphate nanoparticles can either weaken or stimulate p65 NF-κB protein expression in targeted inflamed leucocytes and endothelial cells. In general, unveiling such interactions may be very useful for the future design of anti-p65 siRNA-based nanomedicines for treatment of inflammation-associated diseases.
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Paramudita, Intan, Nur Fadhilah, and Doty Dewi Risanti. "Gold Nanoparticles and Silicate Microsheet Modified Photoanode for Dye Sensitized Solar Cells." Materials Science Forum 936 (October 2018): 77–81. http://dx.doi.org/10.4028/www.scientific.net/msf.936.77.

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Gold nanoparticles and silicate microsheet modified TiO2 photoanode with various decoration amount of gold solution have been successfully synthesized. The gold nanoparticles were prepared using Turkevich method and silicate microsheet was using silica gel. The sample were characterized by XRD, SEM, and FTIR. The DSSC performance were evaluated by photocurrent-voltage measurement. The results show the increasing decoration amount of gold nanoparticles, increase the intensity of diffraction peaks. The gold nanoparticles size is 20-35 nm. Comparing with pristine TiO2 photoanode, the efficiency of DSSC using modified photoanode increase up to 31%.
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Chen, Junhong, and Ganhua Lu. "Controlled decoration of carbon nanotubes with nanoparticles." Nanotechnology 17, no. 12 (May 26, 2006): 2891–94. http://dx.doi.org/10.1088/0957-4484/17/12/011.

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Huang, Haohao, and Eli Ruckenstein. "Decoration of Microparticles by Highly Charged Nanoparticles." Journal of Physical Chemistry B 117, no. 20 (May 10, 2013): 6318–22. http://dx.doi.org/10.1021/jp401889m.

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Luza, Leandro, Aitor Gual, Camila P. Rambor, Dario Eberhardt, Sérgio R. Teixeira, Fabiano Bernardi, Daniel L. Baptista, and Jairton Dupont. "Hydrophobic effects on supported ionic liquid phase Pd nanoparticle hydrogenation catalysts." Phys. Chem. Chem. Phys. 16, no. 34 (2014): 18088–91. http://dx.doi.org/10.1039/c4cp03063j.

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Dissertations / Theses on the topic "Nanoparticles decoration"

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Watson, Venroy George. "Decoration of Graphene Oxide with Silver Nanoparticles and Controlling the Silver Nanoparticle Loading on Graphene Oxide." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1396879714.

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Mrzel, A., A. Kovic, A. Jesih, and M. Vilfan. "Decoration of MoSI Nanowires with Platinum Nanoparticles and Transformation into Molybdenum-nanowire Nased Networks." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35168.

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In this communication, we present solution-based coating procedure of MoSI nanowires (NW) with platinum nanoparticles. The average particle diameter was found to be around 2.82 nm, showing a narrow size distribution. This single-step in situ reduction method at room temperature in water solution can easily be applied for large-scale applications. We also prepared two-dimensional networks of MoSI NW bundles by deposition via spraying from a purified stable dispersion in acetonitrile onto NaCl crystals and nonconductive silicon wafer with pre-assembled molybdenum electrodes. The formation of a conductive molybdenum network was achieved by annealing in hydrogen due to coalescence of the templates MoSI bundles during transformation. Stable water dispersion of molybdenum NW network was prepared by simply dissolving the NaCl substrate with molybdenum network on the surface. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35168
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Bera, Debasis. "ARC-DISCHARGE IN SOLUTION: A NOVEL SYNTHESIS METHOD FOR CARBON NANOTUBES AND IN SITU DECORATION OF CARBON NANOTUBES WITH NANOPAR." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2609.

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Nanotechnology has reached the status of the 21st century's leading science and technology based on fundamental and applied research during the last two decades. An important feature of nanotechnology is to bridge the crucial dimensional gap between the atomic and molecular fundamental sciences and microstructural scale of engineering. Accordingly, it is very important to have an in-depth understanding of the synthesis of nanomaterials for the use of state-of-the-art high technological devices with enhanced properties. Recently, the 'bottom-up' approach for the fabrication of nanomaterials has received a great deal of attention for its simplicity and cost effectiveness. Tailoring the various parameters during synthesis of selected nanoparticles can be used to fabricate technologically important components. During the last decade, carbon nanotubes (CNTs) have been envisioned for a host of different new applications. Although carbon nanotubes can be synthesized using a variety of techniques, large-scale synthesis is still a great challenge to the researchers. Three methods are commonly used for commercial and bulk productions of carbon nanotubes: arc-discharge, chemical vapor deposition and laser ablation. However, low-cost, large-scale production of high-quality carbon nanotubes is yet to be reported. One of the objectives of the present research is to develop a simplified synthesis method for the production of large-scale, low-cost carbon nanotubes with functionality. Herein, a unique, simple, inexpensive and one-step synthesis route of CNTs and CNTs decorated with nanoparticles is reported. The method is simple arc-discharge in solution (ADS). For this new method, a full-fledged optoelectronically controlled instrumen is reported here to achieve high efficiency and continuous bulk production of CNTs. In this system, a constant gap between the two electrodes is maintained using a photosensor which allows a continuous synthesis of the carbon nanostructures. The system operates in a feedback loop consisting of an electrode-gap detector and an analogue electronic unit, as controller. This computerized feed system was also used in single process step to produce in situ-decorated CNTs with a variety of industrially important nanoparticles. To name a few, we have successfully synthesized CNTs decorated with 3-4 nm ceria, silica and palladium nanoparticles for many industrially relevant applications. This process can be extended to synthesize decorated CNTs with other oxide and metallic nanoparticles. Sixty experimental runs were carried out for parametric analysis varying process parameters including voltage, current and precursors. The amount of yield with time, rate of erosion of the anode, and rate of deposition of carbonaceous materials on the cathode electrode were investigated. Normalized kinetic parameters were evaluated for different amperes from the sets of runs. The production rate of pristine CNT at 75 A is as high as 5.89 ± 0.28 g.min-1. In this study, major emphasis was given on the characterizations of CNTs with and without nanoparticles using various techniques for surface and bulk analysis of the nanostructures. The nanostructures were characterized using transmission electron microscopy, high resolution transmission electron microscopy, scanning transmission electron microscopy, energy dispersive spectroscopy and scanning electron microscopy, x-ray photo electron spectroscopy, x-ray diffraction studies, and surface area analysis. Electron microscopy investigations show that the CNTs, collected from the water and solutions, are highly pure except the presence of some amorphous carbon. Thermogravimetric analysis and chemical oxidation data of CNTs show the good agreement with electron microscopy analysis. The surface area analysis depicts very high surface area. For pristine multi-walled carbon nanotubes, the BET surface area is approximately 80 m2.g-1. X-ray diffraction studies on carbon nanotubes shows that the products are clean. Nano-sized palladium decorated carbon nanotubes are supposed to be very efficient for hydrogen storage. The synthesis for in-situ decoration of palladium nanoparticles on carbon nanotubes using the arc discharge in solution process has been extensively carried out for possible hydrogen storage applications and electronic device fabrication. Palladium nanoparticles were found to form during the reduction of palladium tetra-chloro-square planar complex. The formation of such a complex was investigated using ultraviolet-visible spectroscopic method. Pd-nanoparticles were simultaneously decorated on carbon nanotubes during the rolling of graphene sheets in the arc-discharge process. Zero-loss energy filtered transmission electron microscopy and scanning transmission electron microscopy confirm the presence of 3 nm palladium nanoparticles. The deconvoluted X-ray photoelectron spectroscopy envelope shows the presence of palladium. Surface area measurements using BET method show a surface area of 28 m2.g-1. The discrepancy with pristine CNTs can be explained considering the density of palladium (12023 kg.m-3). Energy dispersive spectroscopy suggests no functionalization of chlorine to the sidewall of carbon nanotubes. The presence of dislodged graphene sheets with wavy morphology as observed with high-resolution transmission electron microscopy supports the formation of CNTs through the 'scroll mechanism'.
Ph.D.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science and Engineering
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Nappi, Mary. "Decoration of Amphiphilic NDI-diacetylene Nanotubes with Gold Nanoparticles and the Anti-parallel ß-Sheet Assembly of Porphyrin Modified Tetrapeptides." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1451497452.

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Kwiatkowski, Maciej. "ZnO(core)/TiO2(shell) composites : influence of TiO2 microstructure, N-doping and decoration with Au nanoparticles on photocatalytic and photoelectrochemical activity." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK046/document.

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Le but de la thèse est d'étudier l'influence de la microstructure des composites ZnO/TiO2 sur leurs propriétés dans la dégradation photocatalytique des polluants organiques et dans l'oxydation de l'eau photoassistée. Pour réaliser cette étude, nous avons choisi la conception basée sur des nano bâtonnets ZnO supportés sur une électrode de verre recouverte d'ITO (Indium Tin Oxide). Les nano bâtonnets de ZnO ont ensuite été recouverts d'une couche de TiO2 dans différentes conditions. La composition et la microstructure des composites ZnO(cœur)/TiO2(coquille) ont été modifiées dans le but d'élucider comment ces paramètres influencent leur activité photocatalytique. La couche TiO2 de morphologie différente (discontinue ou compacte) a été élaborée. Nous avons montré que le composite contenant la couche de TiO2 discontinue possède une activité plus élevée dans la dégradation de MB et dans l'oxydation de H2O sous 400 nm. Cette photoactivité améliorée a été attribuée à une meilleure accessibilité pour les réactifs de l'interface ZnO/TiO2 à travers la couche de TiO2. Aussi nous avons pu améliorer l'activité des composites sous la lumière visible. Dans ce but, les composites constitués de nano bâtonnets de ZnO supportés sur ITO ont été recouverts de TiO2 dopé à l'azote et décorés de nanoparticules d'or. Il a été trouvé que même une faible charge d'or (0,37% at.) permet une augmentation de 60% de la vitesse de décoloration photocatalytique du MB sous la lumière visible par rapport à l'échantillon sans or en raison de l'effet plasmonique. Un dopage simultané à l'azote et à l'or a permis également de multiplier par trois le photocourant dans l'oxydation photoassistée de l'eau
The aim of the thesis is to study the influence of microstructure of ZnO/TiO2 composites on their properties in photocatalytic degradation of organic pollutants, and in photoassisted water oxidation. To realize such study we chose the design based on ZnO nanorods supported on ITO (Indium Tin Oxide)-coated glass electrode. The ZnO nanorods were then covered with a layer of TiO2 under different conditions. The composition and microstructure of the obtained ZnO(core)/TiO2(shell) composites were modified in the aim to elucidate how these parameters influence their photocatalytic activity. The results of studies lead to elaboration of two most distinctive variants of sol-gel procedure that allow to deposit TiO2 layers of controlled thicknesses and different morphology (rugged or compact). The composite containing the rugged TiO2 layer was shown to possess significantly higher activity in MB degradation and in photoassisted H2O oxidation under 400 nm. This improved photoactivity was attributed to a higher porosity and better accessibility of ZnO/TiO2 interface region through the rugged TiO2 layer by the reagents. The effort was also made to enhance the visible light activity of the composites. To this aim the composites consisting of ITO-supported ZnO nanorods covered with nitrogen-doped titanium dioxide and decorated with Au nanoparticles. It was found that even a low Au loading (0.37% at.) resulted in 60% enhancement of photocatalytic decolorization of MB under visible light with respect to the Au-free sample owing to plasmonic effects. A simultaneous N-doping and Au decoration allowed also to multiply by three the photocurrent in photoassited water oxidation
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Kwiatkowski, Maciej. "ZnO(core)/TiO2(shell) composites: influence of TiO2 microstructure, N-doping and decoration with Au nanoparticles on photocatalytic and photoelectrochemical activity." Doctoral thesis, Bourgogne Franche-Comté, 2017. https://depotuw.ceon.pl/handle/item/2244.

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Efficient use of renewable energies is one of the most difficult technological challenges facing humanity. Among all renewable energy sources, the sunlight is considered as the most abundant and accessible one. To convert it into usable and controllable form, the modern technology relies on generation of electron-hole pairs in semiconductors upon light absorption. The obtained separated charge carriers possess extra energy brought by the converted sunlight which can be further utilized in various ways. Currently, the most common approach consists in its direct transformation into electricity in p-n junctions. Alternatively, the electrons and holes can be used to perform chemical reactions. The electrons can be transferred to reduce various organic compounds or inorganic species, while simultaneously the holes can play the role of oxidizer by subtracting the electrons from the other substances. Through these reactions it would be possible to accumulate the solar energy in chemical species allowing thus to alleviate the intermittence of the sunlight. Unfortunately, the existing materials do not easily cross the laboratory level to realize this approach on industrial scale. That is why the development of new semiconductor photocatalysts, which harvest and convert efficiently the visible part of solar spectrum, is of paramount importance. For many years the most often studied photocatalytic materials have been ZnO and TiO2. However, it has been recently shown that composites based on ZnO and TiO2 possess even more promising properties than many other semiconductors in various photocatalytic applications. Despite many works reporting high photoactivity of these composites in different applications, the detailed information about the structure–properties correlation is lacking. In order to fill this gap we decided to focus our attention to study the influence of microstructure of ZnO/TiO2 composites on their properties in photocatalytic degradation of organic pollutants, and in application in half-reaction of ‘solar fuel’ generation, namely photoassisted water electro-oxidation. To realize such study the composites should satisfy the requirements of a high surface area and good electric conductivity. We chose therefore the design based on ZnO nanorods supported on ITO (Indium Tin Oxide)-coated glass electrode. The ZnO nanorods (NRs) were then covered with a layer of TiO2 under different deposition conditions. The composition and microstructure of the obtained ZnO(core)/TiO2(shell) composites were modified in the aim to elucidate how these parameters influence their photocatalytic activity. Consequently, the efforts were made to impart visible light activity to the elaborated ZnO/TiO2 composites by modifying titanium dioxide layers with nitrogen and decoration with Au nanoparticles. The thesis consists of three parts: Bibliography, Experimental and Results and Discussion. First part of the present PhD thesis, Bibliography, is dedicated to the analysis of literature concerning fundamental properties of semiconductor materials, solid/electrolyte interface as well as principles of photocatalysis and photoelectrochemical water oxidation. Also, the photocatalytic properties of ZnO and TiO2, and those of their composites are reviewed in this section. Furthermore, methods for improvement visible-light absorption are also described, i.e. N-doping and surface plasmonic effects due to the noble metal nanoparticles (Au NPs) deposited on semiconductors. The second part, Experimental, covers the preparation procedures and characterization techniques used in the work. First, the details are given for electrochemical seeding of ITO support, hydrothermal growth of ZnO nanorods, sol-gel deposition of TiO2 (and N-doped TiO2), and photodeposition of Au NPs. Second, the characterization techniques used in realization of this project are described: SEM (Scanning Electron Microscopy), HAADF-STEM and HR-TEM (High Angle Annular Dark Field Scanning Electron Transmission Microscopy and High Resolution Transmission Electron Microscopy), XRD (X-ray Diffraction Analysis), XPS (X-ray Photoelectron Spectroscopy), EDS ‘or EDX’ (Energy Dispersive Spectroscopy) analyses connected with electron microscopy techniques, UV-vis Spectroscopy and DRS (Diffuse Reflectance UV-vis Spectroscopy, TGA-DSC (Thermogravimetry Differential Scanning Calorimetry Analysis), TOC (Total Organic Carbon) analysis, RT-PL (Room Temperature Photoluminescence Spectroscopy), electrochemical techniques including: LSV (Linear Sweep Voltammetry), CV (Cyclic Voltammetry), chronoamperometry, chronopotentiometry, as well as the set-ups elaborated by the author for the purpose of photocatalytic and photoelectrochemical measurements. The main results of the PhD thesis are presented in the third part, Results and Discussion, consisting of four chapters. In the first chapter (Chapter 4.1), the results of the studies on electrochemical seeding of ITO-electrode in Zn(CH3COO)2 solution are presented. The length and width of ZnO nanorods grown by hydrothermal method from Zn(NO3)2 aqueous solution on Zn/ZnO-seeded ITO substrate were shown to depend strongly on initial Zn2+ concentration and the synthesis duration. The arrays of well-separated ZnO ‘obelisk-like’ nanorods of width varied from 100 nm at tips to ~ 300 nm at bottom and average length of 1.9 µm were prepared under optimized conditions, and used as starting point for further fabrication of (core)ZnO/TiO2(shell) composites. In the second chapter (Chapter 4.2), a simple and low-cost sol-gel method was developed in order to form TiO2 thin layers on ZnO nanorods by hydrolysis of titanium(IV) butoxide. The results of studies lead to elaboration of two most distinctive variants of sol-gel procedure that allow to deposit TiO2 layers of controlled thicknesses and different morphology (rugged or compact). The rugged TiO2 layers were obtained after 6 hours of one step sol-gel synthesis followed by calcination of the sample at 450 oC, ensuring formation of anatase-TiO2, whereas the uniform coating of 25 nm – 40 nm thickness was obtained via three successive 30 min-synthesis with the intermediate calcination of the sample after each deposition cycle. The composite containing the rugged TiO2 layer was shown to possess significantly higher activity in model pollutant (methylene blue, MB) degradation and in photoassisted H2O electro-oxidation under 400 nm monochromatic light irradiation. This improved photoactivity was correlated with the composite microstructure and attributed to a higher porosity and better accessibility of ZnO/TiO2 interface region through the rugged TiO2 layer by the reagents. The TiO2 (shell) layers of similar morphology were also prepared by atomic layer (ALD) and chemical vapor deposition (CVD) techniques and it was shown that the composites fabricated by us with the use of simple sol-gel procedure yield comparable (or even higher) photoactivity. Finally, it was confirmed by total organic carbon (TOC) analysis that the ZnO/TiO2 composites elaborated in this work are also active in decomposition of the pollutants in a dumb hill leachate solution (waste water) under 400 nm monochromatic irradiation. In Chapter 4.3 it is shown that the ZnO/TiO2 interface plays a key role in enhancement of photodecomposition of MB under 400 nm illumination. The increase of photocatalytic activity was attributed to the shift of absorption edge of ZnO/TiO2 towards visible light in comparison to that of the ZnO(core)-etched TiO2. Further enhancement of photocatalytic activity of ZnO/TiO2 was achieved through its additional calcination at 450 °C for 3 h. This simple treatment brings 40% increase in the rate of MB decomposition and a two-fold rise of the photocurrent in H2O oxidation. Measurements of open circuit potential (VOC) showed that the improved properties of additionally calcined ZnO/TiO2 composites stem from the decrease of electron-hole recombination rate. STEM (Scanning Transmission Electron Microscopy) studies showed that the additional calcination resulted in formation of voids at the ZnO/TiO2 interface. EDX (Energy Dispersive X-ray) analysis and XPS (X-ray Photoelectron Spectroscopy) results proved that formation of voids is accompanied by the outward diffusion of Zn ions into TiO2 layer and allowed to conclude about the existence of the Kirkendall effect at ZnO/TiO2 interface. Occurrence of this effect observed for the first time at unusually moderate temperature (450 °C) was shown and attributed to a highly defective nature of the surface layer of the ZnO nanorods. In the last chapter (Chapter 4.4), the composites consisting of ITO-supported ZnO nanorods covered with nitrogen-doped titanium dioxide, TiO2(N), shell were decorated with gold nanoparticles (Au NPs) in order to improve their photocatalytic activity under visible light. The photocatalytic properties of ZnO/TiO2/Au and ZnO/TiO2(N)/Au ternary composites were studied under illumination with Xe lamp equipped with a 400 nm cut-off filter. It was found that low Au NPs loading (0.37% at.) resulted in 60% enhancement of photocatalytic decolorization of MB under visible light with respect to the Au-free sample owing to plasmonic effects. Also, a simultaneous N-doping and Au NPs-decoration allows to multiply by three the photocurrent in photoelectrochemical water oxidation at the potential of 0.8 V vs. Ag/AgCl. It was also demonstrated that the Au-decorated composites possess a strong electrocatalytic activity in reduction O2 to active oxygen species (via formation of O2⦁– radicals) under a small negative bias (–0.25 V vs. Ag/AgCl) in dark. Illumination of the polarized sample with visible light was shown to enhance this process resulting in rapid decomposition a model pollutant (MB) even in the presence of Na2SO4. This approach allows to completely overcome a problem of inhibition of the photocatalytic process by dissolved inorganic salts on non-polarized catalysts, thus meeting the aim of promising material for photoelectrocatalytic remediation of waste water, often containing a significant amount of inorganic ions.
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Chia-HaoChang and 張家豪. "Decoration and application of nanoparticles on graphene oxide." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03440981752120576051.

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碩士
國立成功大學
化學工程學系碩博士班
100
This study concerns the synthesis and catalytic properties of graphene oxide/platinum and graphene/gold nanocomposites. For the synthesis of composites, graphene oxide was prepared by Hummer’s method at first and then platinum or gold nanoparticles were decorated onto its surface via the microwave-assisted synthesis method. For the hydrogen generation from the hydrolysis of sodium borohydride catalyzed by graphene oxide/platinum nanocomposite, it was found that the hydrogen generation rate increased with increasing the temperature. As the catalyst amount increased, the amount of hydrogen generated increased but the specific activity decreased. In addition, with increasing the concentration of sodium borohydride, the hydrogen generation rate increased at first and then decreased. The optimal sodium borohydride concentration was 1 wt%. For the catalytic reduction of 4-nitrophenol by graphene/gold nanocomposite, it was found that the reaction obeyed the pseudo-first-order kinetic model. The reaction rate increased with increasing the temperature and the initial concentration of 4-nitrophenol. However, with increasing the initial concentration of 4-nitrophenol, the rate constant decreased. It was suggested that the reaction was diffusion controlled.
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AntonSetiono and 張涪亮. "Decoration and Characterization of Bi2S3-based Nanoparticles on Reduced Graphene Oxide." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8bcc6f.

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Abstract:
碩士
國立成功大學
化學工程學系
103
As a non-toxic material and abundant resource in the face of the earth, bismuth sulfide was studied extensively in many fields. In this study, rGO/Bi2S3 was synthesized using various methods to observe its morphology and properties. The methods used to synthesized Bi2S3 are hydrothermal and solvothermal methods. Both of them led to nanorod structured Bi2S3 with a very large size and heavy agglomeration. In the presence of graphene oxide, there are some changes in the morphology of Bi2S3, which have shorter rod size and lower agglomeration degree. Parameter changes was done to see its effect on Bi2S3 and rGO/Bi2S3 morphology, these parameters are, precursor concentration, synthesis time, GO content, solvents, the presence of capping agent, and the presence of other metal sulfide. The other metal sulfide used for this experiment is silver sulfide (Ag2S), which also synthesized using hydrothermal method. The combination of two metal sulfides with rGO, which is rGO/Bi2S3-Ag2S, was synthesized using 1-step hydrothermal and 2-step hydrothermal method. From these two methods the morphology of product produced was different and has different crystal structure. The photocatalytic properties of synthesized nanocomposites was observed by photodegradation of methylene blue dye under the irradiation of light from 300 W xenon lamp and also using various photocatalytic parameters. From the test results, the photocatalytic performance of product synthesized was not good for practical use, thus this material is not suitable for photocatalyst but for other applications such as supercapacitor and electrochemical sensor.
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Wu, Chun-Fan, and 吳均凡. "Effect of PdO nanoparticles Decoration on CO sensing Behavior of SnO2." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/35658184415911198840.

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碩士
國立交通大學
工學院半導體材料與製程設備學程
104
Tin oxide is an n-type metal oxide semiconductor (MOS), and widely used as the sensing material of MOS gas sensors. To improve the sensing performance of SnO2 sensors, noble metals are usually used as a sensitizer. Pd is one of the mostly used sensitizer. Metal Pd can be oxidized under a high temperature sensing condition, while PdO can be reduced by reducing target gases in the similar temperature regime. The simultaneous occurrence of Pd oxidation and PdO reduction on the SnO2 sensor surface can significantly affect the gas sensing behavior of SnO2. In this study, we deposited PdO nanoparticles on the SnO2 thin film by sputter deposition followed by high temperature annealing, and study the CO sensing behavior of the Pd-decorated SnO2 sensor. X-ray diffraction spectroscopy (XRD), x-ray photoelectron spectroscopy (XPS), secondary electron microscopy (SEM) an transmission electron microscopy (TEM) were used to study the material properties, including chemical composition, morphology and crystallinity. When the SnO2 thin film is exposed to the gas mixture of CO and dry air, superoxide ion(O2-) and peroxide ion (O22-) adspecies on the SnO2 sensor can be reduced by CO, and the lattice oxygen can also be reduced at high temperatures forming oxygen vacancies in the SnO2 lattice. These surface reactions increase the electron concentration of the SnO2 thin film exposed to toward carbon the CO gas mixture. A thinner SnO2 thin film has a higher sensing response because of a larger volume ratio of the depletion zone to the thin film. PdO decoration greatly increases the sensing response of the SnO2 thin film toward CO. The PN junction formed between SnO2 and PdO modifies the electrical properties of the SnO2 thin film both before and after the CO gas sensing, resulting in an improved sensing performance. According to XPS analyses, the chemical state of the SnO2 thin film varies trivially after the CO sensing. Upon the CO exposure at 150℃and above, oxygen vacancies are formed in SnO2, leading to the increase in the conductivity of the SnO2 sensor. PdO is reduced by CO producing Pd nanoislands, and the conductivity of the SnO2 sensor significantly drops because oxygen can be dissociatively adsorbed on Pd nanoislands. Pd nanoislands can be reoxidized at 150℃as they are grown to a critical size, thereby alleviating the reduction in the sensing current. At temperatures above 150℃, the conductivity reduction as a result of the Pd nanoisland formation becomes insignificant because the higher temperature result in a faster reoxidation rate for Pd nanoislands.
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Huang, Xin-Xiong, and 黃信雄. "Field Emission Enhancement of ZnO Nanorods Assistedby the Decoration of ZnO Nanoparticles." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/61994431269203646715.

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碩士
臺灣大學
物理研究所
98
We have demonstrated that the field emission performance of ZnO nanorods can be greatly enhanced by the decoration of ZnO nanoparticles. It was found that the turn-on electric field (the electric field at which the current density reaches 10 μA/cm^2) can be reduced by about three times, and the field enhancement factor can be enlarged by about 2.5 times. The underlying mechanisms can be attributed to both effects of surface passivation as well as the enhanced electric potential gradient generated by nanoparticle geometry, with the latter one as the dominant factor. Our finding shown here may pave an excellent route for the improvement of field emission properties in many materials.
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Book chapters on the topic "Nanoparticles decoration"

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Jara, Paul, Bárbara Herrera, and Nicolás Yutronic. "Formation of Nanoparticles and Decoration of Organic Crystals." In Handbook of Nanoparticles, 549–64. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-15338-4_26.

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Jara, Paul, Bárbara Herrera, and Nicolás Yutronic. "Formation of Nanoparticles and Decoration of Organic Crystals." In Handbook of Nanoparticles, 1–14. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13188-7_26-1.

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Kaur, Navneet, Vimal K. Bharadwaj, Kamalpreet Kaur, and Narinder Singh. "Surface Decoration of Organic Ligands on Quantum Dots: Fine Tuning of Photophysical Properties." In Handbook of Nanoparticles, 1127–50. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-15338-4_51.

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Kaur, Navneet, Vimal K. Bharadwaj, Kamalpreet Kaur, and Narinder Singh. "Surface Decoration of Organic Ligands on Quantum Dots: Fine Tuning of Photophysical Properties." In Handbook of Nanoparticles, 1–20. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13188-7_51-1.

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Hundáková, Marianna, Kateřina Dědková, and Gražyna Simha Martynková. "Decoration of Inorganic Substrates with Metallic Nanoparticles and Their Application as Antimicrobial Agents." In Metal Nanoparticles in Pharma, 295–336. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63790-7_14.

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Kuttner, Christian, Munish Chanana, Matthias Karg, and Andreas Fery. "Macromolecular Decoration of Nanoparticles for Guiding Self&;#x02010;Assembly in 2D and 3D." In Macromolecular Self&;#x02010;assembly, 159–92. Hoboken, New Jersey: John Wiley &;#38; Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118887813.ch6.

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Khan, Tabassum, and Jahara Shaikh. "Nanoparticle Decoration of Nanocellulose for Improved Performance." In Handbook of Nanocelluloses, 377–405. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-89621-8_22.

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Khan, Tabassum, and Jahara Shaikh. "Nanoparticle Decoration of Nanocellulose for Improved Performance." In Handbook of Nanocelluloses, 1–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-62976-2_22-1.

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Shyam, Aswathi, S. Smitha Chandran, R. Divya Mohan, Sreedha Sambhudevan, and Bini George. "Decoration of carbon nanomaterials with biogenic silver nanoparticles." In Green Synthesis of Silver Nanomaterials, 127–48. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-824508-8.00029-0.

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Satishkumar, B. C., Erasmus M. Vogl, A. Govindaraj, and C. N. R. Rao. "The decoration of carbon nanotubes by metal nanoparticles." In World Scientific Series in 20th Century Chemistry, 292–95. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812835734_0031.

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Conference papers on the topic "Nanoparticles decoration"

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Tao, Ke, Hongjing Dou, Kang Sun, Weihai Yang, and Wanwan Li. "The preparation of magnetic nanoparticles and their decoration towards bifunctional nanoparticles." In 2006 International Symposium on Biophotonics, Nanophotonics and Metamaterials. IEEE, 2006. http://dx.doi.org/10.1109/metamat.2006.335070.

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Ren, W. P., Q. H. Tan, Q. J. Wang, and Y. K. Liu. "Decoration of Au Nanoparticles on Monolayer MoS2 Transistor." In 2019 IEEE 2nd International Conference on Electronics Technology (ICET). IEEE, 2019. http://dx.doi.org/10.1109/eltech.2019.8839456.

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Campana, Ana Lucia, Nadeem Joudeh, Pavlo Mikheenko, and Dirk Linke. "Magnetic Decoration of Escherichia coli Loaded with Palladium Nanoparticles." In 2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2021. http://dx.doi.org/10.1109/nap51885.2021.9568523.

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Peng, Zeping, Hailong Hu, Shijie Wang, Zexiang Shen, Qihua Xiong, P. M. Champion, and L. D. Ziegler. "Enhanced Raman Scattering of Silicon Nanowires by Ag Nanoparticles in-situ Decoration." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482664.

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Kareem, Omar A., Isam M. Ibrahim, and Sabri Jasim Mohameed. "Optimizing the optical response of polypyrrol nanofibers by decoration with ZnO nanoparticles." In THE 2ND UNIVERSITAS LAMPUNG INTERNATIONAL CONFERENCE ON SCIENCE, TECHNOLOGY, AND ENVIRONMENT (ULICoSTE) 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0112176.

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Moghadam, Saeed, Sepideh Zendehdell, and Ahmad Rouhollahi. "Sensitivity enhancemenet in SnO2 based gas sensors by surface decoration with platinum nanoparticles." In 2014 22nd Iranian Conference on Electrical Engineering (ICEE). IEEE, 2014. http://dx.doi.org/10.1109/iraniancee.2014.6999561.

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Quoc Cuong Do, Chungman Moon, Seokoh Ko, Seoktae Kang, Am Jang, and Dong-Hoon Kim. "Hydrothermal decoration of iron oxide nanoparticles on expanded graphite for adsorptional of phosphorus." In 2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2015. http://dx.doi.org/10.1109/nano.2015.7388972.

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Yao, Yimin, Xiaoliang Zeng, Rong Sun, Jian-bin Xu, and Ching-ping Wong. "Effect of silver nanoparticles decoration on the thermal conductivity of boron nitride nanosheets/silicon carbide nanowires bioinspired composite paper." In 2016 17th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2016. http://dx.doi.org/10.1109/icept.2016.7583136.

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Quan, Xiangchun, and Hengduo Xu. "Effect of anodes decoration with metal and metal oxides nanoparticles on pharmaceutically active compounds removal and microbial communities in microbial fuel cells." In The 7th International Multidisciplinary Conference on Optofluidics 2017. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/optofluidics2017-04288.

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Quan, Xiangchun, and Hengduo Xu. "Effect of anodes decoration with metal and metal oxides nanoparticles on pharmaceutically active compounds removal and microbial communities in microbial fuel cells." In The 7th International Multidisciplinary Conference on Optofluidics 2017. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/optofluidics2017-04477.

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