Effects Polyvinyl Alcohol on the Microwave Synthesis of Nano Particle of Stannic Oxide

• Main Authors: Wei-Yao Huang, 黃瑋堯
• Other Authors: Wei-Chun Cheng
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/80458913361174177188

碩士 === 國立臺灣科技大學 === 材料科技研究所 === 92 === Stannic oxide, a N-type semiconductor, is widely applied to detecting the tiny quantity of combustible gas and toxic gas , and be the second lithium battery carrier of the I.T.O. electrode material. When the powder particle size of SnO2 becomes smaller, the characteristics of mechanic intensity, conductivities, heat-working, optical property, adsorb ability, and reaction property etc will be upgraded significantly. This study use the different types of PVA mix in stannic chloride and urea solution to process the resolve response by the method of microwave heat-working. When the surface of SnO2 assimilates high heat, then the interior pressure of SnO2 will rises abruptly, to generate uninterrupted micro-explosion, and PVA’s disperse reaction, it thus can produce a minute nano-size particle. After the processing of a variety of particle size, concentration, and microscope analysis, it is verified that adding the different characteristics of PVA will generate the different particle size and concentration of SnO2. It offers the mechanics of lowering surface tension and enlarging protective colloid in the PVA process of reaction , which makes the dispersion of particle of SnO2 rise up, to obtain the effect of nanolization. The experiment result exhibits: when the PVA has the same degree of hydrolysis and the different degree of polymerization, then its degree of polymerization is higher and the capacity of protective colloid is better, the particle of SnO2 is not easy to agglomerate; thus it generates smaller particle size of product. With the same degree of polymerization and the different degree of hydrolysis, the hydrolysis PVA in the lower portion of degree of hydrolysis with lipophile base and hydrophile base, due to its surface tension is lower, and surface activity is higher, makes water with the spreading property of SnO2 becomes better, it’s also advantageous to the nanolization of SnO2. Therefore, with high degree of polymerization and low degree of hydrolysis of PVA is the best alternative for SnO2 nano manufacturing process.