首页> 外文期刊>Nanotechnology >Narrowing SWNT diameter distribution using size-separated ferritin-based Fe catalysts
【24h】

Narrowing SWNT diameter distribution using size-separated ferritin-based Fe catalysts

机译:使用尺寸分离的铁蛋白基铁催化剂缩小SWNT直径分布

获取原文
获取原文并翻译 | 示例
           

摘要

Sensors and devices made from single-walled carbon nanotubes (SWNTs) are most often electrically probed through metal leads contacting the semiconducting SWNTs (s-SWNTs). Contact barriers in general and Schottky barriers (SBs) in particular are usually obtained at a metal-semiconductor interface. The unique one-dimensional structure (1D) of SWNTs allows tailoring of the SB heights through the contact metal type and the size of the s-SWNT bandgap. A large workfunction reduces the SB height (e.g. using Pd as the metal contact material). The bandgap of an SWNT is inversely proportional to its diameter. Ohmic contacts—the preferable choice-are achieved for s-SWNTs with diameters greater than 2 nm on Pd metal leads. SWNT device reproducibility, on the other hand, requires a narrow distribution of the SWNT diameters. Here, we present a method to fabricate SWNTs with a large and adjustable mean diameter (1.9-2.4 nm) and very narrow diameter distribution (±0.27 nm at mean diameter 1.9 nm). The results are achieved through a size separation of the ferritin catalyst particles by sedimentation velocity centrifugation prior to their use in the chemical vapor deposition (CVD) formation of SWNTs.
机译:由单壁碳纳米管(SWNT)制成的传感器和设备最经常通过与半导体SWNT(s-SWNT)接触的金属引线进行电探测。通常在金属-半导体界面处获得一般的接触势垒,尤其是肖特基势垒(SB)。 SWNT的独特一维结构(1D)允许通过接触金属类型和s-SWNT带隙的大小来定制SB高度。较大的功函数会减小SB高度(例如,使用Pd作为金属触点材料)。 SWNT的带隙与其直径成反比。对于在Pd金属引线上直径大于2 nm的s-SWNT,实现了欧姆接触(最好的选择)。另一方面,SWNT装置的再现性要求SWNT直径的狭窄分布。在这里,我们提出一种制造具有大且可调节的平均直径(1.9-2.4 nm)和非常窄的直径分布(在平均直径1.9 nm时为±0.27 nm)的单壁碳纳米管的方法。通过在沉淀物铁蛋白催化剂颗粒用于SWNTs的化学气相沉积(CVD)形成之前,通过沉淀速度离心法对铁蛋白催化剂颗粒进行大小分离,从而获得结果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号