Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 21, Pages 18735-18741Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5043092
Keywords
AuNP5@MoS2 nanocomposite; SERS-active substrate; hot spot; uniformity
Funding
- National Basic Research Program of China [2012CB933301]
- National Natural Science Foundation of China [21305070, 21475064, 81273409, 61302027]
- Natural Science Foundation of Jiangsu Province [BK20130861, BK20130871]
- Ministry of Education of China [IRT1148, 20123223110007, 20133223120013]
- Scientific Research Foundation of Nanjing University of Posts and Telecommunications [NY212033, NY212032]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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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 AuNP5@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(-1)) 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.
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