NDLI: Ultrasensitive SERS performance in 3D “sunflower-like” nanoarrays decorated with Ag nanoparticles

Content Provider	Royal Society of Chemistry (RSC)
Author	Xiao, Xiangheng Jiang, Changzhong Dai, Zhigao Zhang, Xiaolei Wu, Wei Fu, Lei Zhang, Xingang
Copyright Year	2017
Abstract	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 × 1014 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.
Starting Page	3114
Ending Page	3120
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	9
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c6nr09592e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chemical milling Rhodamine SERS Melamine Surface-enhanced Raman spectroscopy Laser Planar Systems Food safety Polystyrene Silicon dioxide Three-dimensional space
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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