Journal
APPLIED SURFACE SCIENCE
Volume 480, Issue -, Pages 1162-1170Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.02.047
Keywords
Molybdenum oxide nanosheets; Gold nanoparticles; Hot spots; Surface-enhanced Raman scattering
Categories
Funding
- National Natural Science Foundation of China [11874021, 61675072, 21505047, 61505055, 61275187, 81500361, 81670417]
- Natural Science Foundation of Guangdong Province of China [2017A030313813, 2014A030311024]
- Science and Technology Project of Guangdong Province of China [2017A020215059]
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Herein, a facile and green one-pot route was firstly developed for in situ grown Au nanoparticles on oxygen deficient molybdenum oxide nanosheets (MoOx-AuNSs) without extrinsic reductant. The change of molybdenum-oxygen bonds and transformation of valence state of Mo element from Mo4+ and Mo5+ to Mo6+ species in MoOx after the redox reaction were observed. The nanocomposites exhibited tunable surface-enhanced Raman scattering (SERS) activity by adjusting the synthesis condition to assemble optimal hot spots. Utilization of MoOx-AuNSs as novel SERS substrate, ultrasensitive SERS detection of IR-780 iodine, a molecular probe used in biomedicine, was then achieved under different environments. Finally, the molecular fingerprint analysis of cancer cells based on MoOx-AuNSs was also completed, indicating the promising potential of MoOx-based SERS probe for bio-applications.
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