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Facile Fabrication of Amorphous Molybdenum Oxide as a Sensitive and Stable SERS Substrate under Redox Treatment |
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| Authors: | Jiayu Ma Xianjun Tan Prof Yunfei Ma Xinyun Yao Prof Jinlong Zhang Prof Lingzhi Wang |
| Institution: | 1. Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, East China University of Science & Technology, 130 Meilong Road, Shanghai, 200237 P.R. China
These authors contributed equally to this work.;2. Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, 518055 P.R. China These authors contributed equally to this work.;3. Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, East China University of Science & Technology, 130 Meilong Road, Shanghai, 200237 P.R. China |
| Abstract: | Amorphous MoO3−x nanosheets were fabricated by the room-temperature oxidation of molybdenum powder with H2O2, 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 H2O2-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. |
| Keywords: | amorphous materials nanoparticles photocatalysts photochemistry Raman spectroscopy |