Investigation of the Melting Behavior of Nano-confined Tin

• Main Authors: Chung-Tang LIao, 廖崇唐
• Other Authors: Pei-ling Sun
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/49261869373166430373

碩士 === 逢甲大學 === 材料科學所 === 99 === 　　Many physical and chemical properties of nano-materials are changed due to their smaller dimensions and larger surface area, such as melting point temperature. In recent years, nano-materials have drawn much attention. However, the majority of the studies have been focused on the nano free particles. Physical and chemical properties of confined nano-materials are less explored. In this work, melting point of confined nano-materials is discussed. Nano-confinement is not the same as nano-particles which are free standing, nor quantum dots on top of a substrate. It is nano-materials entirely confined and isolated in a non-reacting matrix. 　　In this study, aluminum substrate with regular array dent was used to evaporate a thin tin layer. The aluminum substrate was prepared by the use of anodic treatment and the regular array porous structure of aluminum oxide was removed. The aluminum substrate with a thin tin layer was then heat treated to obtain tin nanoparticles. The experimental results indicate that the tin particles exhibit a bi-modal size distribution), with the particles mainly in the micrometer range. Large particles can be greater than 50μm, while small particles are about several micronmeters. Subsequently, tin particles were confined by TEOS and differential scanning calorimetry (DSC) was used to measure the melting point. It is found that the temperature of melting point is close to the bulk materials. This is because tin particles are large and no dramatic change is found.