为了提高碳纳米管的氧还原性能,利用氨等离子体对碳纳米管进行了表面改性处理.采用透射电子显微镜、拉曼光谱对改性前后碳纳米管的结构进行了表征,利用电化学方法比较分析了改性前后碳纳米管的氧还原性能.研究发现,氨等离子体改性对碳...为了提高碳纳米管的氧还原性能,利用氨等离子体对碳纳米管进行了表面改性处理.采用透射电子显微镜、拉曼光谱对改性前后碳纳米管的结构进行了表征,利用电化学方法比较分析了改性前后碳纳米管的氧还原性能.研究发现,氨等离子体改性对碳纳米管的结构未产生明显的影响,改性后I_D/I_G值无变化,但改性后碳纳米管的氧还原起始电位为-146 m V、半峰电位高-243 m V、动力学电流为17.42 m A/cm^2、电子转移数目为3.0,其均高于碳纳米管的相应参数.等离子体表面改性工艺简单,改性后对氧还原性能显著提高.展开更多
Well aligned nanotubes with diameter of 30—50 nm have been synthesized on a porous alumina template by microwave plasma enhanced chemical vapor deposition (MW PECVD). By this means, the control over either diameter o...Well aligned nanotubes with diameter of 30—50 nm have been synthesized on a porous alumina template by microwave plasma enhanced chemical vapor deposition (MW PECVD). By this means, the control over either diameter or length of the nanotubes could be realized. The hollow structure and vertically aligned features have been verified by scanning electron and transmission electron microscopic images. In comparison with the reported fabrication methods, lower synthesis temperature (below 520 ℃) and simpler process (no negative dc bias applied) have been achieved, which could be of great importance for both theoretical research and pratical applications.展开更多
文摘为了提高碳纳米管的氧还原性能,利用氨等离子体对碳纳米管进行了表面改性处理.采用透射电子显微镜、拉曼光谱对改性前后碳纳米管的结构进行了表征,利用电化学方法比较分析了改性前后碳纳米管的氧还原性能.研究发现,氨等离子体改性对碳纳米管的结构未产生明显的影响,改性后I_D/I_G值无变化,但改性后碳纳米管的氧还原起始电位为-146 m V、半峰电位高-243 m V、动力学电流为17.42 m A/cm^2、电子转移数目为3.0,其均高于碳纳米管的相应参数.等离子体表面改性工艺简单,改性后对氧还原性能显著提高.
文摘Well aligned nanotubes with diameter of 30—50 nm have been synthesized on a porous alumina template by microwave plasma enhanced chemical vapor deposition (MW PECVD). By this means, the control over either diameter or length of the nanotubes could be realized. The hollow structure and vertically aligned features have been verified by scanning electron and transmission electron microscopic images. In comparison with the reported fabrication methods, lower synthesis temperature (below 520 ℃) and simpler process (no negative dc bias applied) have been achieved, which could be of great importance for both theoretical research and pratical applications.
