Three‐dimensional MoS 2 ‐NS@Au‐NPs hybrids as SERS sensor for quantitative and ultrasensitive detection of melamine in milk

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EarlyView Article

  • Published: Nov 16, 2017
  • Author: Xiu Liang, Xiao‐Juan Zhang, Ting‐Ting You, Nan Yang, Guang‐Sheng Wang, Peng‐Gang Yin
  • Journal: Journal of Raman Spectroscopy

Abstract

MoS2, a novel inorganic graphene analogues with typical two‐dimensional structure, has attracted increasing interest in various fields. MoS2‐based hybrid plasmonic structures have been extensively investigated as higher quality surface enhanced Raman scattering (SERS) substrates. Herein, we have designed a three‐dimensional (3D) MoS2 nanospheres (NSs) based hybrid nanostructure as SERS sensor by decorating Au nanoparticles (NPs) on the surface of 3D MoS2‐NSs (3D MoS2‐NS@Au‐NPs). 3D MoS2‐NSs acts as (a) a stable scaffold for Au NPs decoration via microwave‐irradiation hydrothermal process, (b) a chemical mechanism source for Raman enhancement, and (c) a 3D spatial structure for generation of more effective hot spots due to Au coupling effect and supply larger surface area for adsorbing probe molecules. The 3D MoS2‐NS@Au‐NPs hybrid structure exhibits 56‐fold improvement on enhancement factor compared to two‐dimensional MoS2‐NST@Au‐NPs hybrid structures. SERS performance was easily and effectively optimized with the tuning of the density and sizes of Au NPs. The optimized 3D MoS2‐NS@Au‐NPs was applied as SERS sensor for melamine detection in milk. Quantitative detection was realized in the range of 1 ppb–10 ppm with a linear coefficient of .997. Excellent sensitivity of 1 ppb and uniformity of 10.12% relative standard deviation was achieved, which could meet the demand for melamine detection as prescribed by the U.S. Food and Drug Administration.

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