纳米碳管／二氧化硅复合凝胶玻璃的XPS研究

分别以物理掺杂和化学掺杂的方式，采用溶胶-凝胶法制备了未经表面修饰纳米碳管（CNTs）和经r-氨基丙基三乙氧基硅烷（NH2（CH2）3Si（OC2H5）3，APTES）修饰纳米碳管的有机改性SiO2复合凝胶玻璃。在此基础上，以X射线光电子能谱（XPS）为表征手段，对所得两种复合凝胶玻璃中SiO2基质和掺杂CNTs的化学状态进行研究。结果表明，掺杂CNTs改变了复合凝胶玻璃中C和O的原子百分比，对SiO2基质的网络结构产生影响，但对SiO2基质的组成未产生显著影响；无论是在物理掺杂还是化学掺杂的有机改性SiO2复合凝胶玻璃中，CNTs与SiO2间均存在一定的Si—C结合键；在CNTs-SiO2复合凝胶玻璃中，以APTES作为桥梁，实现了CNTs与SiO2网络间的化学键合。

XPS study of carbon nanotubes/organically modified silica composite gel glass

Carbon nanotubes （ CNTs ） and γ-aminopropyl triethoxysilane （ NH2 （ CH2 ）3Si （ OC2 H5 ）3, APTES） -treated carbon nanotubes were introduced into organically modified silica com- posite gel glass through sol-gel technique by physical and chemical doping, respectively. And then, X-ray photoelectron spectroscopy （XPS） was adopted to investigate the chemical states of silica matrices and doped CNTs. Some results were obtained. Firstly, the introduced CNTs have little impact on the composition of silica composite gel glass, but changes the relative atom percentage of C and O atoms. Secondly, whether in physical or chemical doping type, the introduction of CNTs alters both of the networks of silica matrices with some combinations of Si-C bonds being detected between CNTs and SiO2 in the organically modified silica gel glass composite. Lastly, chemical bonds between CNTs and silica networks can be achieved in CNTs-SiO2 xerogel glass with APTES as a bridge.