本實驗係利用不同的多壁奈米碳管表面處理與還原方式以製備錫/奈米碳管複合材料，即Sn/MWCNTs 粉末。實驗方法有三種，第一種方式為將市售奈米碳管藉硝酸氧化形成具結合力的表面結構(O-MWCNTs)，繼以SnCl2 和HCl 的混合水溶液先在O-MWCNTs 表面鍵結SnO2 以形成SnO2/MWCNTs，再利用還原氣氛還原回焊以形成鍍錫的Sn/MWCNTs；第二種方式為利用強還原劑NaBH4 滴定含O-MWCNTs 的SnCl2 水溶液以形成Sn/MWCNTs；第三種方式則藉由具capping effect 的3,5-diaminobenzoic acid(DBA)有機酸改質市售碳管以形成DBA/MWCNTs 後， 再以還原劑NaBH4 滴定含DBA/MWCNTs 與SnCl2 水溶液的懸浮溶液。capping agent(DBA)的功用在於控制還原錫的形狀與大小，因此可在DBA/MWCNTs 表面附著均勻的奈米級純錫顆粒，稱為Sn-DBA/MWCNTs。此外，本研究利用迴焊步驟使銲錫覆蓋MWCNTs 表面。考量電子元件導熱及散熱之需求下，本實驗進一步將Sn-DBA/MWCNTs 壓成錠片並燒結，製成複合材料以進行熱導係數k 的量測， 並於結果發現燒結後Sn-DBA/MWCNTs 錠片之k 值較燒結前Sn-DBA/MWCNTs 錠片優良。

This study tried to functionalize the surface of pristine multiwall carbon nanotubes(P-MWCNTs) with various methods. Thus treated MWCNTs were mixed with Sn ion containing solution to reduce Sn ion and to produce Sn/MWCNTs composite. One of the processes attempted was to oxidize the surface of P-MWCNTs with nitric acid treatment so as to provide appropriate surface for the following Sn deposit. The oxidized MWCNTs were then dispersed in SnCl2 solution to form SnO2 coated MWCNTs. The SnO2 coated CNTs were further reduced and reflowed under reducing atmosphere to form Sn/MWCNTs. The other process for producing Sn/MWCNTs was incorporated with the functionalization of MWCNTs with DBA, C7H8N2O2, as capping agent. The MWCNTs functionalized with DBA were then dispersed in SnCl2 solution followed by titrating with the reducing agent, NaBH4 solution. The size and theshape of particles coated on the wall could be manipulated by DBA. The SEM and TEM images showed that the surface of DBA/MWCNTs was uniformly coated with Tin particles and is termed Sn-DBA/MWCNTs. For the interest of thermal management in electronic packages the Sn-DBA/MWCNTs powders were pressed and then sintered for thermal conductivity evaluation. It was found that the thermal conductivity of sintered Sn-DBA/MWCNTs is better than the as pressed Sn-DBA/MWCNTs.

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