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

作者：Lim Seong Chu^*; Yoon Jung Hyun; Dinh Loc Duong; Cho Young Woo; Kim Tae Hyung; Kim Soo Min; Hwang Ha Ryong; Lee Young Hee

来源：Current Applied Physics, 2015, 15(3): 377-382.

DOI：10.1016/j.cap.2015.01.013

• Carbon nanotubes
• Gas sensor
• Quantum capacitance
• Orientation polarization
• Density of states

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.

• 出版日期2015-3