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A Flexible NO(2) Gas Sensor Based on Single-Wall Carbon Nanotube Films Doped with a High Level of Nitrogen

Carbon nanotubes (CNTs) are considered a promising candidate for the detection of toxic gases because of their high specific surface area and excellent electrical and mechanical properties. However, the detecting performance of CNT-based detectors needs to be improved because covalently bonded CNTs...

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Detalles Bibliográficos
Autores principales: Tian, Xiao-Han, Zhou, Tian-Ya, Meng, Yu, Zhao, Yi-Ming, Shi, Chao, Hou, Peng-Xiang, Zhang, Li-Li, Liu, Chang, Cheng, Hui-Ming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9573668/
https://www.ncbi.nlm.nih.gov/pubmed/36235060
http://dx.doi.org/10.3390/molecules27196523
Descripción
Sumario:Carbon nanotubes (CNTs) are considered a promising candidate for the detection of toxic gases because of their high specific surface area and excellent electrical and mechanical properties. However, the detecting performance of CNT-based detectors needs to be improved because covalently bonded CNTs are usually chemically inert. We prepared a nitrogen-doped single-wall CNT (SWCNT) film by means of gas-phase fluorination followed by thermal annealing in NH(3). The doped nitrogen content could be changed in the range of 2.9–9.9 at%. The N-doped SWCNT films were directly used to construct flexible and transparent gas sensors, which can work at a low voltage of 0.01 V. It was found that their NO(2) detection performance was closely related to their nitrogen content. With an optimum nitrogen content of 9.8 at%, a flexible sensor had a detection limit of 500 ppb at room temperature with good cycling ability and stability during bending.