Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 36, Pages 10643-10647Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201505319
Keywords
carbonaceous nanotubes; chiral structures; plasmon-free detection; surface-enhanced Raman scattering; titania
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Funding
- National Nature Science Foundation of China [21203062, 21377038, 21173077, 21237003]
- National Basic Research Program of China (973 Program) [2013CB632403]
- Research Fund for the Doctoral Program of Higher Education [20120074130001]
- Fundamental Research Funds for the Central Universities [22A201514021]
- Chenguang Program - Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [14CG30]
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Chiral carbonaceous nanotubes (CNT) were successfully used in plasmon-free surface-enhanced Raman scattering (SERS) for the first time. Further modification of TiO2 nanocrystals on the chiral CNTs successfully realized the recycling of SERS substrate as chiral CNT/TiO2 hybrids. The high SERS sensitivity of methylene blue (MB) over the chiral CNT/TiO2 hybrids is ascribed to the laser-driven birefringence induced by the helical structure, which provides much more opportunities for the occurrence of Raman scattering. The TiO2 nanocrystals highly dispersed on the surface and inside the hollow cavity of chiral CNTs can completely degrade the MB under the solar light irradiation, leading to the self-cleaning of SERS substrate. The present research opens a new way for the application of chiral inorganic materials in plasmon-free SERS detection.
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