期刊
NANOSCALE
卷 9, 期 9, 页码 3114-3120出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr09592e
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资金
- NSFC [51371131, 11375134, 51571153]
- Jiangsu Provincial Natural Science Foundation [BK20141217]
- Fundamental Research Funds for the Central Universities
Low-cost, stabilized and ultrasensitive three-dimensional (3D) hierarchical surface-enhanced Raman scattering substrates (sunflower-like nanoarrays decorated with Ag nanoparticles, denoted as SLNAs-Ag) have been obtained by fabricating binary colloidal crystals and then decorating with Ag nanoparticles. In order to provide a larger density of hot spots within the laser-illumination area, the silica sphere arrays were chosen as the island-type platform for the polystyrene (PS) nanosphere deposition, and the distances between the PS nanospheres were tuned by etching for different durations. Compared with conventional 2D planar systems, the as-fabricated 3D SLNAs-Ag exhibited extremely high SERS sensitivity ascribed to the larger SERS active regions. Quantitative detection of molecules with an extremely low incident laser power was achieved on the sunflower-like nanoarrays in which the PS nanospheres were etched for 5 minutes and decorated with Ag nanoparticles, and the corresponding analytical enhancement factor is calculated to be 2 x 10(14) with the concentration of rhodamine 6G down to 10(-15) M. Based on the achieved SERS substrates, we have further demonstrated the highly sensitive detection of molecules such as melamine for food safety inspection.
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