Method for preparing core-shell and hollow silver particles

• Main Authors: Yu-Hsuan Wu, 吳育璿
• Other Authors: Shao-Ju Shih
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/99130410606511782369

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === Recently hollow materials have received much attention due to their wide applications in catalysts, protective agent and drug carriers Silver also has wide applications in catalysts, conductors, electronic components and wound dressings. The method of precipitation and hydrothermal synthesis and the techniques of sol-gel and Kirkendall effect method have been used to fabricate silver and hollow silver particles. However, there is no research about producing hollow silver particles by spray pyrolysis(SP) process. SP process has advantages of low cost and feasibility for mass production. Here we prepared silver particles from the precursors silver nitrate and silver acetate, and added in glycine and starch using the SP process. The decomposed temperature of precursor was measured using thermogravimetric/differential thermal analysis (TG-DTA). Also, the morphology and size of the synthesized silver particles were characterized by scanning electron microscope (SEM) and transmission electron microscopy (TEM). Respectively, X-ray diffractometer (XRD) and selected area electron diffraction (SAED) were used to investigate the crystalline structure. The results show that the precursors add to glycine and starch could receive the hollow or core-shell silver particles. We control porosity of silver particles by different additives and concentration of additives. Finally, we performed UV-Vis/NIR spectrometers and BET, and the result suggest that hollow silver particles absorb less visible light and higher specific surface area than the that of solid silver particles.