title: Growth of coral-like PtAu-MnO2 binary nanocomposites on free-standing graphene paper for flexible nonenzymatic glucose sensors.
abstract: The growing demand for compact point-of-care medical devices and portable instruments for on-site environmental sampling has stimulated intense research on flexible sensors that can be miniaturized and function under considerable physical deformation. We report a new type of flexible electrochemical biosensors based on free-standing graphene paper carrying binary nanocomposites of PtAu alloy and MnO(2). The coral-like PtAu-MnO(2) nanocomposites are grown on the substrate through one-step template-free electrodeposition, leading to an intimate contact between the PtAu alloy and MnO(2) matrix. The flexible electrode exhibits a unique set of structural and electrochemical properties such as better uniformity, larger active surface areas, and faster electron transfer in comparison with the control electrode prepared by tandem growth of MnO(2) network and PtAu alloy in two steps. In nonenzymatic amperometric glucose detection, the PtAu-MnO(2) binary nanostructure-decorated graphene paper has shown greatly enhanced sensing performance such as wide liner range (0.1 mM to 30.0 mM), high sensitivity (58.54 μA cm(-2) mM(-1)), low detection limit (0.02 mM, S/N=3), satisfactory selectivity, excellent reproducibility and stability, and tolerability to mechanical stress. The strategy of co-growth of metal and metal oxides on freestanding carbon substrates opens new possibility to develop high-performance flexible electrochemical sensors.
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore.
authors.forename: Fei
authors.initials: F
authors.lastname: Xiao
authors.forename: Yuanqing
authors.initials: Y
authors.lastname: Li
authors.forename: Hongcai
authors.initials: H
authors.lastname: Gao
authors.forename: Shuibing
authors.initials: S
authors.lastname: Ge
authors.forename: Hongwei
authors.initials: H
authors.lastname: Duan
mesh_terms: D000818:Animals; D037421:Anthozoa / Q000737:chemistry*; D040761:Biomimetic Materials / Q000138:chemical synthesis; D015374:Biosensing Techniques / Q000295:instrumentation*; D003217:Conductometry / Q000295:instrumentation*; D055119:Elastic Modulus; D004798:Enzymes / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis*; D006046:Gold / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation; D010087:Oxides / Q000737:chemistry; D010209:Paper; D010984:Platinum / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D004798:Enzymes; D017895:Manganese Compounds; D010087:Oxides; D010984:Platinum; C027424:manganese oxide; D006046:Gold; D006108:Graphite; D005947:Glucose