Jeon, Jun-Young Kang, Byeong-Cheol Byun, Young Tae Ha, Tae-Jun 2024-01-19T21:01:48Z 2024-01-19T21:01:48Z 2021-09-02 2019-01-28 2040-3364 https://pubs.kist.re.kr/handle/201004/120447 We demonstrate highly sensitive and selective gas sensors based on solution-processed single-wall carbon nanotube (SWCNT) random networks for the detection of nitric oxide (NO) down to the ppb-level operating at room temperature. The proposed gas sensors exhibited a response of 50% under both inert and air atmospheres with a theoretical detection limit of 0.2 ppb and a selectivity toward different target gases of volatile organic compounds, including benzene, toluene, and ammonia. The outstanding sensing performance was realized by functionalizing SWCNT random networks with polyethylenimine (PEI), which possesses a repeating structure of amine groups. We investigate the functionalization properties of SWCNT random networks by using atomic force microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy and the sensing mechanism in the proposed NO gas sensors. We note that solution-process technologies, from the deposition of SWCNT random networks to the polymeric functionalization of amine groups, were employed at room temperature under an ambient atmosphere to fabricate highly sensitive and selective NO gas sensors, which are based on low-cost, effective, and scalable merits in the industry of sensors. We also investigate the effect of ultraviolet (UV) irradiation on the recovery time underlying the sensing mechanism. Photodesorption energy obtained by UV irradiation reduced the recovery time of the proposed NO gas sensors to within a few tens of seconds. We believe that this work is a promising and practical approach for realizing health-care monitoring systems by real-time analyzing NO gas at the ppb level in the field of biosensors. English ROYAL SOC CHEMISTRY SENSING PROPERTIES NANOPARTICLES NO NANOSTRUCTURES POLYMER SURFACE FILM FUNCTIONALIZATION TRANSISTORS COMPOSITES High-performance gas sensors based on single-wall carbon nanotube random networks for the detection of nitric oxide down to the ppb-level Article 10.1039/c8nr07393g 1 NANOSCALE, v.11, no.4, pp.1587 - 1594 NANOSCALE 11 4 1587 1594 scie scopus 000459910900060 2-s2.0-85060402290 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article SENSING PROPERTIES NANOPARTICLES NO NANOSTRUCTURES POLYMER SURFACE FILM FUNCTIONALIZATION TRANSISTORS COMPOSITES Nitric oxide sensor Single-wall carbon nanotube ppb-level high sensitivity high selectivity