Direct Deposition of Gold Nanoparticles on Cellulose Fiber by Solution Plasma Process
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Direct Deposition of Gold Nanoparticles on Cellulose Fiber by Solution Plasma Process Shimpei Nemoto1, Anyarat Watthanphanit1,2, and Nagahiro Saito1,2,3 1 Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan 2 Social Innovation Center (SIDC), Institute of Innovation for Future Society, Nagoya University, Nagoya 464-8603, Japan Green Mobility Collaborative Research Center, Nagoya University, Nagoya 464-8603, Japan
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INTRODUCTION Metal nanoparticles are getting great attention in material science and engineering fields because they have special properties. Gold nanoparticles (AuNPs) are regarded as one of the most attractive metallic nanoparticle used as catalyst [1]. However, according to their small size with high surface energy, direct introduction of them in the reaction system can readily lead to aggregation which is a reason of their catalytic activity decrement [2]. Moreover, sufficient separation and recycling of the AuNPs from the reaction mixtures are generally hard because of the difficulty in handling. As a consequence, immobilization of the AuNPs into various solid supports has been developed [3]. Cellulose can be an ideal choice of support due to its abundant, low cost, poor solubility and good chemical stability. For example, composite material of cellulose and AuNPs converts 4-nitrophenol to 4-aminophenol at normal temperature and under an atmospheric pressure. 4-aminophenol is an intermediate of a pain-killer and an antifebrile. In this composite material, the size of AuNPs is important to control a conversion ability of composite filter. To control the size of gold nanoparticles, we paid attention to a synthesis method of metal nanoparticles which is called “solution plasma process”. This method is achieved by generating glow discharge plasma in liquid phase and known as an easy method to control a synthesis of gold nanoparticles [3-5]. Radicals generated from the plasma are responsible for the reduction of the gold ions to AuNPs as well as the particles immobilization on the support. Effect of the plasma discharge time on the formation and deposition of AuNPs was studied. In this research, composite of cellulose and AuNPs is synthesized by solution plasma process.
EXPERIMENT Materials and chemicals Tungsten electrode: Nilaco Tungsten rod Φ = 1 mm 99.95 % Cellulose: SIGMA-ALDRICH, Cellulose fibers, (medium), insoluble Gold(III) chloride trihydrate: SIGMA-ALDRICH, Gold(III) chloride trihydrate, ACS reagent, ≥49.0% Au basis Potassium Bromide: Wako Pure Chemical, Potassium Bromide, for Infrared Spectrophotometry Solution plasma process setup and procedure The plasma was generated in a reactor containing 100 mL of 1 mM HAuCl4 aqueous solution, where 1 wt% cellulose fiber were dispersed in, by using bipolar pulse power supply. Tungsten wires (Φ=1 mm) were used as electrodes. The gap distance between two electrodes tips was set to 0.5 mm. Scheme of setup is shown in Figure 1. The pulse width and frequency employed during the
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