Different mechanism of capacitance change for gas detection using semiconducting and metallic single-walled carbon nanotubes

被引：1

作者：

Lim, Seong Chu ^{[1
,2
]}

Yoon, Jung Hyun ^{[3
]}

Dinh Loc Duong ^{[1
]}

Cho, Young Woo ^{[1
]}

Kim, Tae Hyung ^{[2
]}

Kim, Soo Min ^{[4
]}

Hwang, Ha Ryong ^{[3
]}

Lee, Young Hee ^{[1
,2
]}

机构：

[1] Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea

[2] Inst for Basic Sci Korea, IBS Ctr Integrated Nanostruct Phys, Taejon 305701, South Korea

[3] WISE CONTROL Inc, R&D Div, Youngin Si 446905, Gyeonggi Do, South Korea

[4] Korea Inst Sci & Technol, Jeonbuk 565905, South Korea

来源：

CURRENT APPLIED PHYSICS | 2015年 / 15卷 / 03期

关键词：

Carbon nanotubes; Gas sensor; Quantum capacitance; Orientation polarization; Density of states; GENERALIZED GRADIENT APPROXIMATION; CHEMICAL-DETECTION; AB-INITIO; NO2; FABRICATION;

D O I：

10.1016/j.cap.2015.01.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Semiconducting single-walled carbon nanotubes (s-SWCNTs) with lower absorption energy of NO2 gas exhibited higher sensitivity than metallic SWCNTs. The result originated from quantum capacitance of s-SWCNTs, which was readily affected by charge transfer, whereas that of m-SWCNTs showed no change with even more transferred charges. However, m-SWCNT that were aligned polarize adsorbed gases on the surface by a local field that contributed the capacitance changes of m-SWCNT networks. This is a newly introduced detection mechanism of gas sensing using m-SWCNTs. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：377 / 382

页数：6

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