摘要
Single-walled carbon nanotubes （SWCNTs） with specific diameters are required for various applications particularly in electronics and photonics, since the diameter is an essential characteristic determining their electronic and optical properties. In this work, the selective growth of SWCNTs with a certain mean diameter is achieved by the addition of appropriate amounts of CO2 mixed with the carbon source （CO） into the aerosol （floating catalyst） chemical vapor deposition reactor. The noticeable shift of the peaks in the absorption spectra reveals that the mean diameters of the as-deposited SWCNTs are efficiently altered from 1.2 to 1.9 nm with increasing CO2 concentration. It is believed that CO2 acts as an etching agent and can selectively etch small diameter tubes due to their highly curved carbon surfaces. Polymer-free as-deposited SWCNT films with the desired diameters are used as saturable absorbers after stamping onto a highly reflecting Ag-mirror using a simple dry-transfer technique. Sub-picosecond mode-locked fiber laser operations at -1.56μm and -2 μm are demonstrated, showing improvements in the performance after the optimization of the SWCNT properties.
有特定的直径的围单人赛的碳 nanotubes (SWCNT ) 特别地在电子学和 photonics 为各种各样的应用被要求，自从直径是决定他们的电子、光的性质的一个必要特征。在这个工作，有某个吝啬的直径的 SWCNT 的选择生长被与碳来源(公司) 一起混合进喷雾器(漂浮的催化剂) 的 CO2 的适当数量的增加完成化学蒸汽免职反应堆。在吸收系列的山峰的显著移动表明同样扔的 SWCNT 的吝啬的直径高效地与增加 CO2 集中从 1.2 ～ 1.9 nm 被改变。当一个蚀刻的代理人和罐头有选择地由于他们的高度弄弯的碳表面蚀刻小直径试管， CO2 行动，这被相信当一个蚀刻的代理人和罐头有选择地由于他们的高度弄弯的碳表面蚀刻小直径试管。有需要的直径的没有聚合物的同样扔的 SWCNT 电影在用一种简单干燥转移的技术踩到一面高度思考的 Ag 镜子上以后被用作可饱和的吸收器。在 1.56 m 和 2 m 的亚微微秒锁模式的纤维激光操作被表明，显示出在在 SWCNT 性质的优化以后的表演的改进。
