title: Highly sensitive SERS detection of Hg2+ ions in aqueous media using gold nanoparticles/graphene heterojunctions.
abstract: Gold nanoparticles (AuNPs)/reduced graphene oxide (rGO) heterojunctions were synthesized directly on SiO2/Si substrates via a seed-assisted growth process. The in situ chemical fabrication strategy has been proven to be quite simple and efficient for generating highly active surface-enhanced Raman scattering (SERS) substrates due to synergistic enhanced protocol from rGO and AuNPs. The SERS substrates with AuNPs/rGO heterojunctions have been utilized for trace analysis of mercury(II) ions via thymine-Hg(2+)-thymine coordination. Thereby, very low limits of detection, i.e., 0.1 nM or 20 ppt for Hg(2+), can be achieved in contrast with some other SERS subsrtates, which suggests that the heterojunctions are appropriate as versatile surface-enhanced substrates applied in chemical sensing or biosensing.
authors.affiliation: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Ding
authors.forename: Lingtao
authors.initials: L
authors.lastname: Kong
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Dandan
authors.initials: D
authors.lastname: Li
authors.forename: Jinhuai
authors.initials: J
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D015374:Biosensing Techniques; D004247:DNA / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry; D018625:Microscopy, Atomic Force / Q000379:methods; D008855:Microscopy, Electron, Scanning / Q000379:methods; D036103:Nanotechnology / Q000379:methods; D009841:Oligonucleotides / Q000235:genetics; D010087:Oxides / Q000737:chemistry; D053838:Scattering, Small Angle; D013059:Spectrum Analysis, Raman; D013941:Thymine / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D009841:Oligonucleotides; D010087:Oxides; D014867:Water; D006046:Gold; D006108:Graphite; D004247:DNA; D008628:Mercury; D013941:Thymine