Highly sensitive and selective NO₂ detection by Pt nanoparticles-decorated single-walled carbon nanotubes and the underlying sensing mechanism

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• 作者：Sun-Woo ChoiAuthor Vitae ; Jaeseong KimAuthor Vitae ; Young Tae Byun ; ^{byt427@kist.re.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Single-walled carbon nanotubes ; Pt nanoparticles ; NO2 ; Gas sensors
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：238
• 期：Complete
• 页码：1032-1042
• 全文大小：4160 K

文摘

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 °C than that at room temperature (25 °C), their sensing characteristics for all gases such as NO₂, NO, C₆H₆, C₇H₈, C₃H₆O, CO, and NH_3, 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.