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

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

Author(s): Seong Chu Lim; Yoon J.H.; Duong D.L.; Cho Y.W.; Tae Hyung Kim; Kim S.M.; Hwang H.R.; Young Hee Lee

Subject: Carbon nanotubes, Gas sensor, Quantum capacitance, Orientation polarization, Density of states

Abstract: 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.