期刊
NANOSCALE
卷 12, 期 35, 页码 18056-18066出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr02972f
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资金
- National Natural Science Foundation of China [51673023, 51773017, 51373024, 51403017, 11947065]
- Fundamental Research Funds for the Central Universities [FRF-GF-17-B12]
- National Key Basic Research Program of China [2014CB931804]
- Interdisciplinary Innovation Fund of Nanchang University [2019-9166-27060003]
An effective SERS substrate for on-field detection needs to satisfy high sensitivity to analyte and signal reproducibility even in the special case of tilting or bending of substrates. Herein, we transferred monolayer AuNPs into a nanocavity to construct a Au particle-in-hemispherical honeycomb nanoarray (PIHHN) as an ultrasensitive and spatially reproducible SERS substrate. The capacity of detection for R6G in an optimal PIHHN substrate is as low as a concentration of 10(-15) M, and the RSD of signal deviation is no more than 5.6%. FDTD simulations explain that placing AuNPs into a metallic nanocavity can capture and focus the light field to improve the interaction between the light and the substrate and provide the collective effect of multiple plasmon coupling, which can induce a stronger electromagnetic field. In addition, the system can generate more hot spots between AuNPs and between AuNPs and the metallic nanocavity. In particular, when the substrate is tilted or bent at an angle from 0 degrees to 60 degrees, the SERS performance remains stable due to the rotational symmetry of the PIHHN structure, which demonstrates the capability of on-field detection. Furthermore, the PIHHN substrate is employed as a highly sensitive multiplex sensor in on- field analysis for contaminated soil, achieving the detection of analytes down to 0.5 ppb.
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