Carbon based dot capped silver nanoparticles for efficient surface-enhanced Raman scattering. Issue 31 (25th July 2016)

• Record Type: Journal Article
• Authors: Dong, Yongqiang; Wang, Qian; Wan, Lisi; You, Xu; Chi, Yuwu
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 31(2016)
• Page Start: 7472
• Page End: 7477
• Publication Date: 2016-07-25
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6tc01943a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A simple method has been developed for the preparation of silver nanoparticles/carbon based quantum dot nano-hybrids for surface-enhanced Raman scattering substrates. Abstract : A simple method has been developed for the preparation of silver nanoparticles/carbon based quantum dot nano-hybrids (AgNPs@CDs). First, the small-sized CDs with abundant oxygen-containing functional groups adsorbed Ag + ions through ion exchange or coordination reactions. Then, during the reaction with NaBH4, the Ag + ions were reduced to AgNPs while the oxygen-containing functional groups were partially removed from the CDs. Thus, CDs were coated on the surfaces of the resultant AgNPs, leading to the formation of AgNPs@CDs. The residual oxygen-containing groups on the CDs made the obtained AgNPs@CDs possess excellent dispersivity and long-term stability in water. The synthesized AgNPs@CDs showed high surface-enhanced Raman scattering (SERS) activity and provided a sensitive SERS sensing ability for 4-aminothiophenol, with a wide dynamic range from 1 × 10 −10 to 1 × 10 −5 M and a low detection limit (S/N = 3) of 5.0 × 10 −11 M.