Choi, Sun-Woo Kim, Jaeseong Byun, Young Tae 2024-01-20T02:04:38Z 2024-01-20T02:04:38Z 2021-09-01 2017-02 0925-4005 https://pubs.kist.re.kr/handle/201004/123120 In this study, we have demonstrated highly sensitive and selective NO2 gas sensors based on single-walled carbon nanotubes (SWCNTs) decorated with Pt nanoparticles (NPs) by applying a sputtering technique and sequential thermal treatment under atmosphere. The effect of the operating temperature on the sensing capabilities of SWCNT sensors was determined by using NO2 as a representative oxidizing gas. In spite of higher NO2-response of SWCNT sensors at 100 degrees C than that at room temperature (25 degrees C), their sensing characteristics for all gases such as NO2, NO, C6H6, C7H8, C3H6O, CO, and NH3, respectively, were investigated at room temperature for actual sensing applications. In order to estimate the NO2-selectivity of Pt NPs-decorated SWCNT sensors, the cross-sensibilities of the fabricated sensors to 2 ppm target gases were measured at room temperature. The sensing results revealed that sputtering and post-annealing techniques were an effective means of decorating SWCNT surfaces with catalytic Pt NPs; the significant improvement in NO2-detection (i.e., response and selectivity for NO2) of SWCNT sensors, owing to this decoration, was also confirmed. The methodology used in this study can pave the way for synthesizing various combinations of metal NPs and carbon-based nanostructured materials, which may be used as sensing materials for detecting hazardous gas species. (C) 2016 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA REDUCED GRAPHENE OXIDE GAS SENSOR PERFORMANCE NANOWIRES SURFACE COMPOSITES ACETONE Highly sensitive and selective NO2 detection by Pt nanoparticles-decorated single-walled carbon nanotubes and the underlying sensing mechanism Article 10.1016/j.snb.2016.07.153 1 SENSORS AND ACTUATORS B-CHEMICAL, v.238, pp.1032 - 1042 SENSORS AND ACTUATORS B-CHEMICAL 238 1032 1042 scie scopus 000388948600125 2-s2.0-84989829005 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article REDUCED GRAPHENE OXIDE GAS SENSOR PERFORMANCE NANOWIRES SURFACE COMPOSITES ACETONE Single-walled carbon nanotubes Pt nanoparticles NO2 Gas sensors