AVS 65th International Symposium & Exhibition
    2D Materials Focus Topic Wednesday Sessions
       Session 2D+MN+NS+SS-WeA

Paper 2D+MN+NS+SS-WeA3
Novel Binder-free Ag@Ni(OH)2 over Graphene/Ni Foam and Glucose Sensing

Wednesday, October 24, 2018, 3:00 pm, Room 201B

Session: IoT Session: Surface Chemistry, Functionalization, Bio and Sensor Applications
Presenter: Tong-Hyun Kang, DGIST, Republic of Korea
Authors: T.-H. Kang, DGIST, Republic of Korea
J.-S. Yu, DGIST, Republic of Korea
Correspondent: Click to Email
Graphene combining with metal nanoparticles or other compounds is widely recognized to be a viable strategy to assemble high-activity catalysts.Unique properties of high conductivity and transparency, 2D morphology, and high stability in acid and alkaline solutions make graphene an excellent electron transfer medium on the interface of graphene/active materials as catalysts.Among them, graphene/metal nanoparticle (G/MNP) composites have been attracting more interest because of remarkably enhanced catalytic property, which is ascribed to a synergic effect from the interface of graphene and active sites. In general, reducing agents and electrodeposition methodshave been employed to in-situ reduce metal ions such as Au3+, Pt4+, Ag+, and Cu2+ (Mx+) to MNPs on the graphene to form G/MNP composites.In this study, graphene is grown on nickel foam (NF) by chemical vapor deposition (CVD), which is directly used for MNP deposition. Different from bare NF, special phenomenon is observed that the graphene-coated nickel foam (GNF) composite can greatly speed up the electrodeless reduction of Mx+ ions on the surface of the graphene. Interestingly, the MNP deposition and Ni(OH)2 nanosheet assembly simultaneously occur on the GNF. Binder-free Ni(OH)2-wrapped Ag hybrid developed on the GNF (Ag@Ni(OH)2-GNF) is found to serve as an efficient electrochemical sensor because of its unique structure. A low detection limit of 0.3 μM and high sensitivity are achieved for the glucose detection, which confirms that the hierarchical electrode structure of Ag@Ni(OH)2-GNF composite is highly effective to have extensive applications.