Kim, Chaeeun Park, Jun-Cheol Choi, Sun Young Kim, Yonghun Seo, Seung-Young Park, Tae-Eon Kwon, Se-Hun Cho, Byungjin Ahn, Ji-Hoon 2024-01-19T23:01:48Z 2024-01-19T23:01:48Z 2021-09-03 2018-04-12 1613-6810 https://pubs.kist.re.kr/handle/201004/121480 2D layered materials with sensitive surfaces are promising materials for use in chemical sensing devices, owing to their extremely large surface-to-volume ratios. However, most chemical sensors based on 2D materials are used in the form of laterally defined active channels, in which the active area is limited to the actual device dimensions. Therefore, a novel approach for fabricating self-formed active-channel devices is proposed based on 2D semiconductor materials with very large surface areas, and their potential gas sensing ability is examined. First, the vertical growth phenomenon of SnS2 nanocrystals is investigated with large surface area via metal-assisted growth using prepatterned metal electrodes, and then self-formed active-channel devices are suggested without additional pattering through the selective synthesis of SnS2 nanosheets on prepatterned metal electrodes. The self-formed active-channel device exhibits extremely high response values (>2000% at 10 ppm) for NO2 along with excellent NO2 selectivity. Moreover, the NO2 gas response of the gas sensing device with vertically self-formed SnS2 nanosheets is more than two orders of magnitude higher than that of a similar exfoliated SnS2-based device. These results indicate that the facile device fabrication method would be applicable to various systems in which surface area plays an important role. English WILEY-V C H VERLAG GMBH VAPOR-DEPOSITION 2-DIMENSIONAL SNS2 WAFER-SCALE MOS2 PERFORMANCE NANOSHEETS ELECTRONICS MONOLAYERS FILMS Self-Formed Channel Devices Based on Vertically Grown 2D Materials with Large-Surface-Area and Their Potential for Chemical Sensor Applications Article 10.1002/smll.201704116 1 SMALL, v.14, no.15 SMALL 14 15 scie scopus 000430186600018 2-s2.0-85045396166 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article VAPOR-DEPOSITION 2-DIMENSIONAL SNS2 WAFER-SCALE MOS2 PERFORMANCE NANOSHEETS ELECTRONICS MONOLAYERS FILMS 2D materials chemical sensing devices nanosheets SnS2 vertical growth