Ultrasensitive NO2 gas sensors using hybrid heterojunctions of multi-walled carbon nanotubes and on-chip grown SnO2 nanowires

Quan Thi Minh Nguyet; Nguyen Van Duy; Chu Manh Hung; Nguyen Duc Hoa; Nguyen Van Hieu

doi:10.1063/1.5023851

journal article Apr 09, 2018

Ultrasensitive NO2 gas sensors using hybrid heterojunctions of multi-walled carbon nanotubes and on-chip grown SnO2 nanowires

Quan Thi Minh Nguyet Nguyen Van Duy

Chu Manh Hung

Nguyen Duc Hoa

Nguyen Van Hieu

Applied Physics Letters Vol. 112 No. 15 · AIP Publishing

View at Publisher Save 10.1063/1.5023851

Abstract

Hybrid heterojunction devices are designed for ultrahigh response to NO2 toxic gas. The devices were constructed by assembling multi-walled carbon nanotubes (MWCNTs) on a microelectrode chip bridged bare Pt-electrode and a Pt-electrode with pre-grown SnO2 nanowires (NWs). All heterojunction devices were realized using different types of MWCNTs, which exhibit ultrahigh response to sub-ppm NO2 gas at 50 °C operated in the reverse bias mode. The response to 1 ppm NO2 gas reaches 11300, which is about 100 times higher than that of a back-to-back heterojunction device fabricated from SnO2 NWs and MWCNTs. In addition, the present device exhibits an ultralow detection limit of about 0.68 ppt. The modulation of trap-assisted tunneling current under reverse bias is the main gas-sensing mechanism. This principle device presents a concept for developing gas sensors made of a hybrid between semiconductor metal oxide NWs and CNTs.

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Details

Published: Apr 09, 2018
Vol/Issue: 112(15)

Authors

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Quan Thi Minh Nguyet