title: Fabrication of nanoelectrode ensembles by electrodepositon of Au nanoparticles on single-layer graphene oxide sheets.
abstract: Nanoelectrode ensembles (NEEs) have been fabricated by the electrodeposition of Au nanoparticles (AuNPs) on single-layer graphene oxide (GO) sheets coated on a glassy carbon electrode (GCE). The fabricated NEEs show a typical sigmoidal shaped voltammetric profile, arising from the low coverage density of AuNPs on GCE and large distance among them, which can be easily controlled by varying the electrodeposition time. As a proof of concept, after the probe HS-DNA is immobilized on the NEEs through the Au-S bonding, the target DNA is detected with the methylene blue intercalator. Our results show that the target DNA can be detected as low as 100 fM, i.e. 0.5 amol DNA in 5 μL solution.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Zhijuan
authors.initials: Z
authors.lastname: Wang
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Zongyou
authors.initials: Z
authors.lastname: Yin
authors.forename: Shixin
authors.initials: S
authors.lastname: Wu
authors.forename: Daniel
authors.initials: D
authors.lastname: Mandler
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
mesh_terms: D004247:DNA / Q000032:analysis; D015342:DNA Probes / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D004595:Electroplating; D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry; D009693:Nucleic Acid Hybridization; D010087:Oxides / Q000737:chemistry*
chemical_list: D015342:DNA Probes; D010087:Oxides; D006046:Gold; D006108:Graphite; D004247:DNA; D008751:Methylene Blue