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Facile Fabrication of Amorphous Molybdenum Oxide as a Sensitive and Stable SERS Substrate under Redox Treatment
Author(s) -
Ma Jiayu,
Tan Xianjun,
Ma Yunfei,
Yao Xinyun,
Zhang Jinlong,
Wang Lingzhi
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904642
Subject(s) - amorphous solid , substrate (aquarium) , redox , materials science , molybdenum , raman spectroscopy , oxide , photocatalysis , chemical engineering , methanol , photochemistry , chemistry , catalysis , organic chemistry , metallurgy , optics , physics , engineering , oceanography , geology
Amorphous MoO 3− x nanosheets were fabricated by the room‐temperature oxidation of molybdenum powder with H 2 O 2 , followed by light‐irradiation reduction in methanol. When applied as a substrate for surface‐enhanced Raman spectroscopy (SERS), these nanosheets exhibit higher sensitivity than the crystalline counterpart for a wide range of analytes. Moreover, the SERS activity remains stable on repeated oxygen insertion/extraction. In contrast, the performance of crystalline MoO 3− x continuously deteriorates on successive redox treatments. This unique SERS activity allows the recycling of the substrate through an H 2 O 2 ‐based Fenton‐like reaction. More importantly, the non‐invasive SERS was unprecedentedly used for the self‐diagnosis of amorphous MoO 3− x as a more selective photocatalyst than its crystalline counterpart.