Choi, Junghoon Kim, Yong-Jae Cho, Soo-Yeon Park, Kangho Kang, Hohyung Kim, Seon Joon Jung, Hee-Tae 2024-01-19T16:32:38Z 2024-01-19T16:32:38Z 2021-09-02 2020-10 1616-301X https://pubs.kist.re.kr/handle/201004/118073 The main gas-sensing mechanisms of 2D materials are surface charge transfer by analytes and Schottky barrier (SB) modulation at the interface between the metallic and semiconducting surfaces. In particular, dramatic differences in the gas-sensing performances of 2D materials originate from SB modulation. However, SB sites typically exist only at the interface between the semiconducting channel material and the metal electrode. Herein, in situ formed multiple SBs in a single gas-sensing channel are demonstrated, which are derived from the heterojunction of metallic Ti(3)C(2)and semiconducting TiO2. In stark contrast with previous techniques, edge-oxidized Ti(3)C(2)flakes are synthesized by solution oxidation, allowing the uniform formation of TiO(2)crystals on all flakes that comprise the gas sensing channel. Oxidized colloidal solutions are subjected to vacuum filtration to automatically form SB sites at the multiple inter-flake junctions in both the outer surface and inner bulk regions of the film. The TiO2/Ti(3)C(2)composite sensor shows 13.7 times higher NO(2)sensitivity as compared with pristine Ti(3)C(2)MXene, while the responses of the reducing gases are almost unchanged. The results suggest a new strategy for improving gas-sensing performance by maximizing the density of SB sites through a simple method. English WILEY-V C H VERLAG GMBH MOS2 PERFORMANCE MXENE NANOMATERIALS ANATASE In Situ Formation of Multiple Schottky Barriers in a Ti(3)C(2)MXene Film and its Application in Highly Sensitive Gas Sensors Article 10.1002/adfm.202003998 1 ADVANCED FUNCTIONAL MATERIALS, v.30, no.40 ADVANCED FUNCTIONAL MATERIALS 30 40 scie scopus 000557406800001 2-s2.0-85089155394 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article MOS2 PERFORMANCE MXENE NANOMATERIALS ANATASE gas sensing MXene Schottky barrier titanium carbide 2D materials