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Layered Double Oxides for Sensing Reducing Volatile Organic Compounds: The Effect of Local Charge Region Modulation
Author(s) -
Qin Yuxiang,
Xu Xin,
Xia Qing,
Wang Xinyang
Publication year - 2021
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202100161
Subject(s) - materials science , heterojunction , metal , valence (chemistry) , layered double hydroxides , oxide , chemical physics , chemical engineering , nanotechnology , inorganic chemistry , optoelectronics , chemistry , organic chemistry , metallurgy , engineering , hydroxide
Multi‐metal oxides with uniform distribution of various metal elements have potential for an enhanced gas‐sensing response due to the strong heterogeneous and synergistic effects involved. In this study, three layered double oxides, labeled as CuCr‐, ZnCr‐, and ZnTi‐LDOs, respectively, were prepared with corresponding LDHs (layered double hydroxides) as precursors and self‐sacrificial templates. The elemental mapping confirms the uniform distribution of hetero‐metal elements in whole LDOs. The CuCr‐LDOs exhibits a much larger sensing response towards reducing VOCs at room temperature, which is 3.5 or 13.3 times that of ZnCr‐ or ZnTi‐LDOs, respectively. The response differences are analyzed in terms of the local charge region modulation associated with heterojunction formation, and it is further demonstrated based on first‐principles calculations and valence electron theory. The present work suggests a possible strategy for developing highly sensitive oxide‐based gas sensors for VOCs detection.