Journal
SMALL
Volume 14, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801523
Keywords
localized surface plasmon resonance (LSPR); quantum dots; surface-enhanced Raman spectroscopy (SERS); supercritical CO2
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Funding
- National Natural Science Foundation of China [21773216, 51173170, 21571157]
- Science and Technology Project of Henan Province [152102410010]
- Key program of science and technology from the Zhengzhou Bureau of Science and Technology [121PZDGG213]
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Surface-enhanced Raman spectroscopy (SERS) based on plasmonic semi-conductive material has been proved to be an efficient tool to detect trace of substances, while the relatively weak plasmon resonance compared with noble metal materials restricts its practical application. Herein, for the first time a facile method to fabricate amorphous HxMoO3 quantum dots with tunable plasmon resonance is developed by a controlled oxidization route. The as-prepared amorphous HxMoO3 quantum dots show tunable plasmon resonance in the region of visible and near-infrared light. Moreover, the tunability induced by SC CO2 is analyzed by a molecule kinetic theory combined with a molecular thermodynamic model. More importantly, the ultrahigh enhancement factor of amorphous HxMoO3 quantum dots detecting on methyl blue can be up to 9.5 x 10(5) with expending the limit of detection to 10(-9) m. Such a remarkable porperty can also be found in this HxMoO3-based sensor with Rh6G and RhB as probe molecules, suggesting that the amorphous HxMoO3 quantum dot is an efficient candidate for SERS on molecule detection in high precision.
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