Creating SERS Hot Spots on MoS2 Nanosheets with in Situ Grown Gold Nanoparticles

详细信息    查看全文

• 作者：Shao Su ; Chi Zhang ; Lihui Yuwen ; Jie Chao ; Xiaolei Zuo ; Xingfen Liu ; Chunyuan Song ; Chunhai Fan ; Lianhui Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：6
• 期：21
• 页码：18735-18741
• 全文大小：480K
• ISSN：1944-8252

文摘

Herein, a reliable surface-enhanced Raman scattering (SERS)-active substrate has been prepared by synthesizing gold nanoparticles (AuNPs)-decorated MoS₂ nanocomposite. The AuNPs grew in situ on the surface of MoS₂ nanosheet to form efficient SERS hot spots by a spontaneous redox reaction with tetrachloroauric acid (HAuCl₄) without any reducing agent. The morphologies of MoS₂ and AuNPs-decorated MoS₂ nanosheet were characterized by TEM, HRTEM, and AFM. The formation of hot spots greatly depended on the ratio of MoS₂ and HAuCl₄. When the concentration of HAuCl₄ was 2.4 mM, the as-prepared AuNPs@MoS₂-3 nanocomposite exhibited a high-quality SERS activity toward probe molecule due to the generated hot spots. The spot-to-spot SERS signals showed that the relative standard deviation (RSD) in the intensity of the main Raman vibration modes (1362, 1511, and 1652 cm^鈥?) of Rhodamine 6G were about 20%, which displayed good uniformity and reproducibility. The AuNPs@MoS₂-based substrate was reliable, sensitive, and reproducible, which showed great potential to be an excellent SERS substrate for biological and chemical detection.

Keywords:

AuNPs@MoS₂ nanocomposite; SERS-active substrate; hot spot; uniformity