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

被引：239
作者：
Su, Shao [1 ,2 ]
Zhang, Chi [1 ,2 ]
Yuwen, Lihui [1 ,2 ]
Chao, Jie [3 ]
Zuo, Xiaolei [3 ]
Liu, Xingfen [1 ,2 ]
Song, Chunyuan [1 ,2 ]
Fan, Chunhai [1 ,2 ,3 ]
Wang, Lianhui [1 ,2 ]
机构：
[1] Nanjing Univ Posts & Telecommun, Key Lab Organ Elect & Informat Displays KLOEID, Inst Adv Mat, Nanjing 210046, Jiangsu, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Sch Mat Sci & Engn, Nanjing 210046, Jiangsu, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Appl Phys, Div Phys Biol, Shanghai 201800, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2014年 / 6卷 / 21期
基金：
中国国家自然科学基金;
关键词：
AuNP5@MoS2 nanocomposite; SERS-active substrate; hot spot; uniformity; ENHANCED RAMAN-SCATTERING; SINGLE-LAYER; SPECTROSCOPY; EXFOLIATION; MOLECULES; STRATEGY; AU; AG;
D O I：
10.1021/am5043092
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：18735 / 18741
页数：7
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