Facile Fabrication of Amorphous Molybdenum Oxide as a Sensitive and Stable SERS Substrate under Redox Treatment. Issue 12 (23rd January 2020)

• Record Type: Journal Article
• Authors: Ma, Jiayu; Tan, Xianjun; Ma, Yunfei; Yao, Xinyun; Zhang, Jinlong; Wang, Lingzhi
• Is Part Of: Chemistry. Volume 26:Issue 12(2020)
• Page Start: 2653
• Page End: 2657
• Publication Date: 2020-01-23
• Subjects: amorphous materials -- nanoparticles -- photocatalysts -- photochemistry -- Raman spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201904642
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Amorphous MoO3− x nanosheets were fabricated by the room‐temperature oxidation of molybdenum powder with H2 O2, 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 MoO3− x continuously deteriorates on successive redox treatments. This unique SERS activity allows the recycling of the substrate through an H2 O2 ‐based Fenton‐like reaction. More importantly, the non‐invasive SERS was unprecedentedly used for the self‐diagnosis of amorphous MoO3− x as a more selective photocatalyst than its crystalline counterpart. Abstract : Amorphous nanoparticles : Amorphous MoO3− x nanosheets fabricated by a mild and facile route show high sensitivity and stability as substrates for surface‐enhanced Raman spectroscopy (SERS) compared with the crystalline counterpart. The SERS activity is free from redox interference, and this allows recycling of the substrate through an H2 O2 ‐based Fenton‐like reaction and precise monitoring of photocatalysis (see scheme).