ScholarWorks: Flexible room-temperature NO2 gas sensors based on carbon nanotubes/reduced graphene hybrid films

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UNIST Central Research Facilities (UCRF)

Research Interests

Soft material characterization such as graphene using a low kV Cs-corrected TEM
Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
Structural characterization of mesoporous materials using SEM & TEM
Interface analysis between various oxides and metals through Cs-corrected (S)TEM
Resistive switching mechanism of graphene oxide thin films for RRAM application

Flexible room-temperature NO2 gas sensors based on carbon nanotubes/reduced graphene hybrid films

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Title: Flexible room-temperature NO2 gas sensors based on carbon nanotubes/reduced graphene hybrid films

Author: Jeong, Hu Young; Lee, Dae-Sik; Choi, Hong Kyw; Lee, Duck Hyun; Kim, Ji-Eun; Lee, Jeong Yong; Lee, Won Jong; Kim, Sang Ouk; Choi, Sung-Yool

Keywords: Bending stress; Enhanced sensitivity; Film surfaces; Gas sensors; High sensitivity; Hybrid film; Polyimide substrate; Room temperature; Sensing performance; Sensor response; Vertically aligned CNT arrays

Abstract: We present a flexible room temperature NO2 gas sensor consisting of vertical carbon nanotubes (CNTs)/reduced graphene hybrid film supported by a polyimide substrate. The reduced graphene film alone showed a negligible sensor response, exhibiting abnormal N-P transitions during the initial NO2 injection. A hybrid film, formed by the growth of a vertically aligned CNT array (with CNTs 20 μm in length) on the reduced graphene film surface, exhibited remarkably enhanced sensitivities with weak N-P transitions. The increase in sensitivity was mainly attributed to the high sensitivity of the CNT arrays. The outstanding flexibility of the reduced graphene films ensured stable sensing performances in devices submitted to extreme bending stress.