Growth of Ag Nanoparticles by Spin Coating

2013 ◽  
Vol 24 ◽  
pp. 163-167 ◽  
Author(s):  
S.D. Sartale ◽  
A.A. Ansari
Keyword(s):  
Ag Nanoparticles ◽  
Spin Coating ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Environment Effects ◽  
Uv Visible ◽  
Absorbance Spectra ◽  
Scanning Electron ◽  
Better Than

Ag nanoparticles were grown on glass substrate by spin coating of Ag ions (AgNO3) solution followed by either chemical reduction, in aqueous hydrazine or NaBH4 solution, or by thermal reduction in H2 environment. Effects of different reducing agent have been explained. Morphology and absorbance spectra ofAg nanoparticles films, measured by using Scanning Electron Microscopy (SEM) and UV-visible Spectrophotometer techniques, are used to understand effect of reduction process on growth of Ag nanoparticles. To grow uniformly size distributed Ag nanoparticles thermal reduction in H2 is better than chemical reduction by aqueous either NaBH4 orhydrazine hydrate solutions.

Microwave-Hydrothermal Synthesis and Characterization of Graphene

2012 ◽  
Vol 602-604 ◽  
pp. 917-920 ◽  
Author(s):  
Zhen Hui Xiao ◽  
Shui Sheng Wu ◽  
Yan Lin Sun ◽  
Yu Lin Zhao ◽  
Ya Ming Wang
Keyword(s):  
Chemical Reduction ◽  
Visible Spectrum ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Hydrothermal ◽  
Ft Ir ◽  
Uv Visible ◽  
Scanning Electron

Graphene was synthesized by microwave-hydrothermal chemical reduction of graphite oxide using hydrazine hydrate as the reducing agent. Graphene was characterized using X-ray diffraction, UV-visible spectrum, FT-IR spectrum and scanning electron microscopy. Results indicated that the as-prepared graphene was wrinkled and comprised fewer graphenes with a highly crystalline structure.

Photocatalytic Water Splitting over Ag/TiO2 Nano-Wire Films

2014 ◽  
Vol 665 ◽  
pp. 288-291 ◽  
Author(s):  
Yang Hu ◽  
Chao Pan ◽  
Cai Xia Gao ◽  
Jun Fan ◽  
En Zhou Liu
Keyword(s):  
Surface Plasmon Resonance ◽  
Water Splitting ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Resonance Absorption ◽  
Absorption Properties ◽  
Surface Plasmon Resonance Absorption

Plasmonic Ag decorated TiO2 nano-wire film was firstly prepared by the combination of a hydrothermal method and a microwave-assisted chemical reduction process. The results show that Ag deposited TiO2 film exhibits obvious visible light absorption due to surface plasmon resonance absorption of Ag nanoparticles. Besides, fluorescence quenching is observed in the composite film under the excitation of 250 nm. Photocatalytic tests show that Ag deposited TiO2 exhibits enhanced photocatalytic activity for H2 production by water splitting due to the synergistic effect between charge transfer and surface plasmon resonance absorption properties of Ag nanoparticles.

Determination of Morphology of Poly(3-hexythiophene) with Nanosphere- and Nanorod-Shape of Zinc Oxide

2014 ◽  
Vol 925 ◽  
pp. 304-307
Author(s):  
Azyuni Aziz ◽  
Fatin Hana Naning ◽  
Syed Abdul Malik ◽  
Reza Zamiri
Keyword(s):  
Zinc Oxide ◽  
Spin Coating ◽  
Emission Spectroscopy ◽  
Quartz Substrate ◽  
Zno Nanorods ◽  
Zno Thin Films ◽  
X Ray ◽  
Scanning Electron ◽  
Better Than

Morphology of thin film poly (3-hexylthiophene) (P3HT) embedded with nanosphere-and nanorod-shape Zinc Oxide (ZnO) has been studied. We deposited the materials on quartz substrate using spin coating technique. The morphology of P3HT: ZnO thin films were investigated using Field Emission Scanning Electron Microscopy (FESEM), Energy-dispersive X-ray emission spectroscopy (EDX) and RAMAN Spectroscopy and compared. Based on size and shape of both ZnO, it can be seen that nanospheres in P3HT was found to be better than ZnO nanorods in P3HT.

scholarly journals Green Solid-State Chemical Reduction of Graphene Oxide Supported on a Paper Substrate

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 693
Author(s):  
Angela Longo ◽  
Mariano Palomba ◽  
Gianfranco Carotenuto
Keyword(s):  
Graphene Oxide ◽  
Solid State ◽  
Chemical Reduction ◽  
Low Cost ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Conversion Degree ◽  
Reduction Techniques ◽  
Reduction Methods ◽  
State Chemical

The reduction of graphene oxide (GO) thin films deposited on substrates is crucial to achieve a technologically useful supported graphene material. However, the well-known thermal reduction process cannot be used with thermally unstable substrates (e.g., plastics and paper), in addition photo-reduction methods are expensive and only capable of reducing the external surface. Therefore, solid-state chemical reduction techniques could become a convenient approach for the full thickness reduction of the GO layers supported on thermally unstable substrates. Here, a novel experimental procedure for quantitative reduction of GO films on paper by a green and low-cost chemical reductant (L-ascorbic acid, L-aa) is proposed. The possibility to have an effective mass transport of the reductant inside the swelled GO solid (gel-phase) deposit was ensured by spraying a reductant solution on the GO film and allowing it to reflux in a closed microenvironment at 50 °C. The GO conversion degree to reduced graphene oxide (r-GO) was evaluated by Fourier transform infrared spectroscopy (FT-IR) in attenuated total reflectance (ATR) mode and X-ray Diffraction (XRD). In addition, morphology and wettability of GO deposits, before and after reduction, were confirmed by digital USB microscopy, scanning electron microscopy (SEM), and contact angle measurements. According to these structural characterizations, the proposed method allows a bulky reduction of the coating but leaves to a GO layer at the interface, that is essential for a good coating-substrate adhesion and this special characteristic is useful for industrial exploitation of the material.

Photocatalytic Reduction of CO2 on Au/TiO2 Nanocomposite Film

2014 ◽  
Vol 953-954 ◽  
pp. 995-998 ◽  
Author(s):  
Shuo Wang ◽  
Yi Chen Li ◽  
Chao Song ◽  
En Zhou Liu ◽  
Jun Fan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Absorption Spectrum ◽  
Photoluminescence Spectrum ◽  
Au Nanoparticles ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Photocatalytic Reduction ◽  
Microwave Assisted ◽  
Scanning Electron

Plasmonic Au decorated TiO2 nanosheet film was firstly prepared by the combination of a hydrothermal method and a microwave-assisted chemical reduction process. The prepared sample was characterized by scanning electron microscopy (SEM), UV-vis absorption spectrum (UV-vis) and photoluminescence spectrum (PL) respectively. Results show that Au nanoparticles with narrow distribution are uniformly loaded on the nanosheet surface, and the resulted composite nanostructure exhibits distinct surface plasmon absorption and quenched photoluminescence compared to pure TiO2 nanostructure. Photocatalytic tests show that Au decorated TiO2 exhibits enhanced photocatalytic activity for photocatalytic reduction of CO2 to methanol.

Preparation and electrochemical capacitance of graphene/titanium nitride nanotube array

RSC Advances ◽  
2014 ◽  
Vol 4 (79) ◽  
pp. 41856-41863 ◽  
Author(s):  
Fang Tian ◽  
Yibing Xie ◽  
Hongxiu Du ◽  
Yingzhi Zhou ◽  
Chi Xia ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Electrode Material ◽  
Composite Electrode ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Electrochemical Capacitance ◽  
Nanotube Array ◽  
Graphene Composite ◽  
Adsorption Reduction

The graphene composite electrode material was synthesized on the substrate of titanium nitride nanotube array (TiN NTA) through a simple adsorption–reduction process, forming chemical reduction graphene/TiN NTA (G/TiN NTA) and thermal reduction graphene/TiN NTA (TRG/TiN NTA).

Conductive Silver-Modified TiO2 Nanoparticles Prepared by a Silver Mirror Reaction

2014 ◽  
Vol 977 ◽  
pp. 69-72
Author(s):  
Yu Mei Gong ◽  
Na Zhao ◽  
Yi Wen Li ◽  
Shuai Zhang ◽  
Hong Zhang ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Anatase Phase ◽  
Reduction Process ◽  
Electrically Conductive ◽  
Silver Mirror ◽  
Silver Mirror Reaction ◽  
Resistivity Meter

A simple and non-toxic way was employed to fabricate electrical conductive TiO2materials based on a chemical reduction process here. Glucose was selected as a reductant to reduce AgNO3to obtain Ag-modified TiO2nanoparticles. The properties of the nanoparticles were characterized by XRD, TEM, and fourpoint probe resistivity meter. The results show that the TiO2was successfully modified by Ag nanoparticles, and the major crystalline phase of TiO2in the Ag-modified TiO2composite is anatase phase. The size of Ag increased with the AgNO3concentration increasing. Compared with pure TiO2, the Ag modified TiO2has a higher electrically conductive. In principle, it is expected to be a general and versatile approach to increase the conductivity of insulator or semiconductor.

scholarly journals Synthesis and Spectroscopic Analysis of Au-Ag Alloy Nanoparticles with Different Composition of Au and Ag

2021 ◽  
Vol 12 (1) ◽  
pp. 377-390
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fluorescence Spectroscopy ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Spectroscopic Techniques ◽  
Alloy Nanoparticles ◽  
Absorption Data ◽  
Bimetallic Alloy ◽  
Scanning Electron

Au-Ag bimetallic alloy nanoparticles, having an average size from 35 to 25 nm, were successfully synthesized (using chemical reduction process) from AuCl3 and AgNO3. Ethylene glycol was used as a solvent and polyaniline (PANI) as a capping agent. Au-Ag alloy nanoparticles, with different proportions among Au and Ag, were synthesized and characterized by various spectroscopic techniques. The steady-state fluorescence spectroscopy, X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM) data revealed the formation of alloy nanoparticles of various compositions, which agrees with the absorption data obtained by UV-Visible spectroscopy. Ag was found to be acting as a quencher for emission radiations, as evidenced by fluorescence spectroscopy. XRD data pointed out the crystalline structure of alloy nanoparticles. Variation in Au and Ag's atomic composition in Au-Ag was confirmed by energy dispersive spectroscopy (EDS). Scanning Electron Microscopy (SEM) was applied to study the morphology of the bimetallic alloy nanoparticles. Interestingly, the size of nanoparticles decreases with a decrease in Au's composition in Au-Ag alloy nanoparticles. Maximum values of molar absorptivity were recorded by Au-Ag alloy nanoparticles with ratio 1:3, which indicates that at ratio 1:3 of Au and Ag in Au-Ag alloy nanoparticles, the size of the nanoparticles is minimum with maximum surface area.

Flowery Ni Microcrystals Consisting of Star-shaped Nanorods: Facile Synthesis, Formation Mechanism and Magnetic Properties

2011 ◽  
Vol 64 (11) ◽  
pp. 1494 ◽  
Author(s):  
Hao Li ◽  
Jinyun Liao ◽  
Zhen Jin ◽  
Xibin Zhang ◽  
Xiuxian Lu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Formation Mechanism ◽  
Quantum Interference ◽  
Chemical Reduction ◽  
Magnetic Measurement ◽  
Reduction Process ◽  
Cubic Phase ◽  
X Ray ◽  
Scanning Electron

Flowerlike Ni microcrystals composed of star-shaped Ni nanorods with a diameter of ~200 nm were fabricated by a facile chemical reduction process, in which ethylenediamine tetraacetic acid sodium (EDTA) was used as complexant to assist in the formation of the flowery shape of the sample. The products were characterized by X-ray diffractometer, scanning electron microscopy, energy-dispersive X-ray spectroscopy and superconducting quantum interference device magnetometer. Scanning electron microscopy images indicated the typical size of the flowery Ni microcrystals was 2–3 μm and the length of the star-shaped Ni nanorods was in the hundreds of nanometers up to micron scale. The X-ray diffraction pattern showed the Ni microcrystals were present in the face-centred cubic phase and magnetic measurement results demonstrated the greatly enhanced coercivity of the sample (168.5 Oe) at room temperature. Based on the evolution of the structure and the morphology of products with increasing reaction time, a possible formation mechanism was proposed to illustrate the growth of the flower-like Ni architecture.

Sign in / Sign up

Export Citation Format

Share Document