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Optical Properties of Nanosilver Synthesized by chemical reduction method at Room Temperature

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Optical Properties of Nanosilver Synthesized by Chemical Red...

A Pioneering Approach to the Synthesis of Silver Nanoparticles

第十七届全国化学热力学和热分析学术会议

作者： S.Jiang A.M.Bai Y.J.Hu Hubei Key Laboratory of Pollutant Analysis ＆ Reuse Technology Department of ChemistryHubei Normal University

Nanosilver has been applied in many fields including surface-enhanced Raman spectroscopy（SERS）,surface enhanced fluorescence（SEF）,biomedicine and other areas due to the its unique physical and chemical *** this paper,nanosilver equipped with uniform dispertion,controllable partical size and morphology was prepared by chemical reduction method in aqueous *** reaction can be carried out at room temperature（298.15K）by taking silver nitrate as the source,sodium borohydride as a reducing agent,sodium citrate tribasic dihydrate and Polyvinylpyrrolidone as protective ***,we focused on the effects of reaction time,temperature,protective agents and so forth on the experimental *** analysis of UV–vis spectra（Fig.1）showed that the surface plasmon resonance（SPR）absorption peaks of asprepared nanosilver appeared at about 400 nm and 650 nm,which demonstrated the formation of nanosilver corresponding to different morphologies and particle *** addition,sharp and smooth peaks indicated a uniform dispersion.

关键词： Nanosilver chemical reduction method UV-vis spectrum surface plasmon resonance(SPR)

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Journal of Materials Science and chemical Engineering 2024年第7期12卷 14-22页

作者： Wasan A. Al-Dulaimi Zeena M. Al-Azzawi Emad K. Al-Shakarchi Physics Department College of Science Al-Nahrain University Baghdad Iraq

Our research introduces a groundbreaking chemical reduction method for synthesizing silver nanoparticles, marking a significant advancement in the field. The nanoparticles were meticulously characterized using various techniques, including optical analysis, structural analysis, transmission electron microscopy (TEM), and field-emission scanning electron microscope (FESEM). This thorough process instills confidence in the accuracy of our findings. The results unveiled that the silver nanoparticles had a diameter of less than 20 nm, a finding of great importance. The absorption spectrum decreased in the peak wavelength range (405 - 394 mm) with increasing concentrations of Ag nanoparticles in the range (1 - 5%). The XRD results indicated a cubic crystal structure for silver nanoparticles with the lattice constant (a = 4.0855 Å), and Miller indices were (111), (002), (002), and (113). The simulation on the XRD pattern showed a face center cubic phase with space group Fm-3m, providing valuable insights into the structure of the nanoparticles.

关键词： chemical reduction method UV-VIS Absorption Spectrometer Field-Emission Scanning Electron Microscope (FESEM) Transmission Electron Microscopy (TEM)

Growth-controlled synthesis of polymer-coated colloidal-gold nanoparticles using electrospray-based chemical reduction

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Particuology 2021年第4期19卷 72-81页

作者： Mohamed Hasaan Hussain Noor Fitrah Abu Bakar Kim-Fatt Low Ana Najwa Mustapa Fatmawati Adam Mohd Nazli Naim I.Wuled Lenggoroe Faculty of chemical Engineering Universiti Teknologi MARAShah AlamSelangor 40450Malaysia Faculty of Applied Sciences Universiti Teknologi MARAPerak BranchTapah CampusTapah RoadPerak 35400Malaysia Faculty of chemical and Process Engineering Technology Universiti Malaysia PahangLebuh Raya Tun RazakGambangPahang 26300Malaysia Department of Process and Food Engineering Faculty of EngineeringUniversiti Putra MalaysiaSerdangSelangor 43400Malaysia Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyNaka Cho2-24-16KoganeiTokyo 184-8588Japan Department chemical of Engineering Tokyo University of Agriculture and TechnologyNaka Cho2-24-16KoganeiTokyo 184-8588Japan

In this study,the controlled nucleation and growth of gold nanoparticles(GNPs)were investigated using a self-repelled mist in a liquid chemical reaction *** electrospray-based chemical reduction method was conducted in the aqueous region and at room temperature to synthesize the polymeric-stabilized gold *** electrospray technique was used to atomize a hydrogen tetrachloraurate(III)(HAuCl4)precursor solution into electrostatically charged *** atomized droplets were dispersed in an aqueous reaction bath containing L-ascorbic acid as a reducing agent and polyvinylpyrrolidone(PVP)as a *** effect of the electrospray parameters,specifically the flow rate and electrospray droplet size,as well as the reaction conditions such as the concentration of reactants,pH,and stabilizer(PVP),were *** mean diameter of the GNPs increased from around 4 to 9 nm with an increase in the electrospray flow rate,droplet size,and current passing through the electrospray *** and monodispersed GNPs were synthesized at a relatively high flow rate of 2 mL/h and a moderate concentration of 2 mM of precursor *** smallest-sized GNP with a high monodispersity was obtained in the reaction bath at a high pH of 10.5 and in the presence of *** is expected that continuous and mass production of the engineered GNPs and other noble metal nanoparticles could be established for scaling up nanoparticle production via the proposed electrospray-based chemical reduction method.

关键词： Electrospray Gold nanoparticles chemical reduction method L-ascorbic acid PVP Aqueous medium

Synthesis and electrochemical performance of a novel nano sized Sn_2SbNi composite

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 253-256页

作者：郭洪林雪飞陈益山 School of chemical Science and Technology Yunnan University School of Chemistry and chemical Engineering Qujing Normal University

chemical reduction method was employed to prepare nano-sized Sn2SbNi alloy composites used as anode material for rechargeable lithium ion *** strategy was adopted to combine the virtues of both active/inactive and active/active alloys to fabricate a Sn2SbNi alloy powder with two active components and one inactive *** two active components can realize the high capacity feature of electrode and can make the volume change of electrode take place in a stepwise manner due to the different lithiation potentials of two active components,leading to a stable cycling ***2SbNi alloy provides a reversible specific capacity over 640 mA·h/g with an excellent cyclic *** Sn-Sb-Ni alloy composite material shows to be a good candidate anode material for the lithium ion batteries.

关键词： Li-ion batteries Sn2SbNi composite anode materials chemical reduction method

Fe₃O₄ and Fe Nanoparticles by chemical reduction of Fe(acac)₃ by Ascorbic Acid: Role of Water

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World Journal of Nano Science and Engineering 2016年第1期6卷 20-28页

作者： Ajinkya G. Nene Makoto Takahashi Prakash R. Somani Department of Applied Chemistry Chubu University Kasugai Japan Applied Science Innovations Pvt. Ltd. Pune India

Nanoparticles of Fe3O4 and Fe are chemically synthesized by reduction of Fe(acac)3 using ascorbic acid in controlled condition. It was observed that addition of water during the chemical synthesis process yields Fe3O4 nanoparticles, whereas if the reaction is carried out in absence of water yields Fe nanoparticles—which get oxidized upon exposure to air atmosphere. Fe3O4 (15 ± 5 nm) and Fe/iron oxide nanoparticles (7 ± 1 nm) were successfully synthesized in the comparative study reported herewith. Mechanism for formation/synthesis of Fe3O4 and Fe/iron oxide nanoparticles is proposed herewith in which added water acts as an oxygen supplier. Physico-chemical characterization done by SEM, TEM, EDAX, and XPS supports the proposed mechanism.

关键词： Fe3O4 Nanoparticles Fe-Nanoparticles Iron Oxide chemical reduction method