title: Creating SERS hot spots on MoS(2) nanosheets with in situ grown gold nanoparticles.
abstract: 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(-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.
authors.affiliation: Key Laboratory for Organic Electronics & Information Displays (KLOEID), Institute of Advanced Materials (IAM), and School of Materials Science and Engineering, Nanjing University of Posts & Telecommunications , 9 Wenyuan Road, Nanjing 210046, China.
authors.forename: Shao
authors.initials: S
authors.lastname: Su
authors.forename: Chi
authors.initials: C
authors.lastname: Zhang
authors.forename: Lihui
authors.initials: L
authors.lastname: Yuwen
authors.forename: Jie
authors.initials: J
authors.lastname: Chao
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Zuo
authors.forename: Xingfen
authors.initials: X
authors.lastname: Liu
authors.forename: Chunyuan
authors.initials: C
authors.lastname: Song
authors.forename: Chunhai
authors.initials: C
authors.lastname: Fan
authors.forename: Lianhui
authors.initials: L
authors.lastname: Wang
mesh_terms: D004220:Disulfides / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D012235:Rhodamines / Q000032:analysis / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: D004220:Disulfides; D012235:Rhodamines; C026188:rhodamine 6G; D006046:Gold; D008982:Molybdenum; C082964:molybdenum disulfide
keywords: AuNPs@MoS2 nanocomposite; SERS-active substrate; hot spot; uniformity