Journal
ADVANCED SCIENCE
Volume 6, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900310
Keywords
energy band engineering; photoinduced degradation; surface-enhanced Raman scattering; the coupled resonance effect; ultra-sensitive Ta2O5 nanorod substrate
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Funding
- National Natural Science Foundation of China [51471182, 11574383]
- Shanghai International Science and Technology Cooperation Fund [17520711700]
- National Key Research and Development Project [2017YFB0310600, 2017YFA0303603]
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Recent achievements in semiconductor surface-enhanced Raman scattering (SERS) substrates have greatly expanded the application of SERS technique in various fields. However, exploring novel ultra-sensitive semiconductor SERS materials is a high-priority task. Here, a new semiconductor SERS-active substrate, Ta2O5, is developed and an important strategy, the coupled resonance effect, is presented, to optimize the SERS performance of semiconductor materials by energy band engineering. The optimized Mo-doped Ta2O5 substrate exhibits a remarkable SERS sensitivity with an enhancement factor of 2.2 x 10(7) and a very low detection limit of 9 x 10(-9) m for methyl violet (MV) molecules, demonstrating one of the highest sensitivities among those reported for semiconductor SERS substrates. This remarkable enhancement can be attributed to the synergistic resonance enhancement of three components under 532 nm laser excitation: i) MV molecular resonance, ii) photoinduced charge transfer resonance between MV molecules and Ta2O5 nanorods, and iii) electromagnetic enhancement around the gap and tip of anisotropic Ta2O5 nanorods. Furthermore, it is discovered that the concomitant photoinduced degradation of the probed molecules in the time-scale of SERS detection is a non-negligible factor that limits the SERS performance of semiconductors with photocatalytic activity.
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