Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
Nanotechnology. 2011 Jul 1;22(26):265503. doi: 10.1088/0957-4484/22/26/265503. Epub 2011 May 17.
The 1/f noise and temperature coefficient of resistance (TCR) are investigated in multiwall carbon nanotube (MWCNT) film bolometers since both affect the bolometer detectivity directly. A comparison is made between the MWCNT film bolometers and their single-wall carbon nanotube (SWCNT) counterparts. The intrinsic noise level in the former has been found at least two orders of magnitude lower than that in the latter, which outweighs the moderately lower TCR absolute values in the former and results in higher bolometer detectivity in MWCNT bolometers. Interestingly, reduced noise and enhanced TCR can be obtained by improving the inter-tube coupling using thermal annealing in both SWCNT and MWCNT films, suggesting much higher detectivity may be achieved via engineering the inter-tube coupling.
1/f 噪声和电阻温度系数（TCR）在多壁碳纳米管（MWCNT）薄膜测辐射热计中进行了研究，因为它们都直接影响测辐射热计的探测率。MWCNT 薄膜测辐射热计与单壁碳纳米管（SWCNT）薄膜测辐射热计进行了比较。前者的固有噪声水平至少低两个数量级，这超过了前者 TCR 绝对值的适度降低，导致 MWCNT 薄膜测辐射热计的探测率更高。有趣的是，通过在 SWCNT 和 MWCNT 薄膜中使用热退火来改善管间耦合，可以获得降低的噪声和增强的 TCR，这表明通过工程化管间耦合可以实现更高的探测率。
