Ahrom Ryu Bo-In Park Hyun-Jae Lee Jung-Won An Jeong-Jun Kim Sahn Nahm Seong H. Kim Byungju Lee Ji-Won Choi Jang, Ji Soo 2024-11-29T07:30:10Z 2024-11-29T07:30:10Z 2024-11-25 2025-01 2050-7488 https://pubs.kist.re.kr/handle/201004/151172 https://pubs.rsc.org/en/Content/ArticleLanding/2024/TA/D4TA06114D 2D metal oxides have attracted significant interest in numerous scientific research fields owing to their exceptional physicochemical properties derived from unique crystal structures and surfaces. However, unfortunately, there are still challenges to achieving fast and sensitive chemical sensing using 2D metal oxides due to their poor surface porosity. Here, a simple but powerful synthetic method for highly porous as well as reduced 2D metal oxides is suggested through a 2D oxide exfoliation approach combined with flash-thermal shock (FTS). The molecular thick-level 2D Ti0.87O2 nanosheets are simply synthesized by ion-exchange exfoliation and a subsequent ultra-fast FTS (7.5 ms) process, resulting in simultaneous formation of uniform pores and reduced Ti0.87O2-x on the 2D Ti0.87O2 surface. In this process, the heterojunctions play a crucial role in enhancing the sensitivity by facilitating charge transfer and improving the electrical properties. Density functional theory calculations and ex situ TEM analysis elucidate that the fast phase transformation of 2D Ti0.87O2 is a key driving force of porosity and reduced Ti0.87O2-x formation. Based on these features, porous 2D Ti0.87O2 exhibits an exceptional HCHO sensing characteristic including outstanding reversibility and sensitivity even at room temperature. English Royal Society of Chemistry Ultrafast formation of porosity and heterogeneous structures on 2D oxides via momentary photothermal effect Article 10.1039/D4TA06114D 1 Journal of Materials Chemistry A, v.13, no.1, pp.561 - 572 Journal of Materials Chemistry A 13 1 561 572 N scie scopus 001365187600001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article; Early Access DIELECTRIC-PROPERTIES LAYERED STRUCTURE TEMPERATURE CRYSTAL SURFACE CONSTRUCTION DEPOSITION MORPHOLOGY TOTAL-ENERGY CALCULATIONS NANOSHEET THIN-FILMS