Enzymeless electrochemical detection of hydrogen peroxide at Pd nanoparticles/porous graphene
In this work,Pd nanoparticles/porous graphene (Pd/PGR) is prepared by simultaneous reduction of graphene oxide (GO) and Pd precursor in sodium borohydride (NaBH4) solutions at the electrode surface.In this preparation,the positively charged ZnO with high isoelectric point is used as templates for the adsorption of negatively charged GO in water.Then,the poly(diallyldimethylammonium chloride) (PDDA) is added into the ZnO/GO through the electrostatic interaction between the negative charge of GO and positive charge of PDDA.Subsequently,PDDA/ZnO/GO is employed as a support material for the adsorption of chloropalladic acid ions (PdCl4 2-),via the self-assembly between the negative Pd precursor and positively charged functional groups of PDDA.One-step reduction of Pd precursor/PDDA/ZnO/GO in NaBH4 solutions and the subsequent removal of the ZnO produce Pd/PDDA/PGR with a porous structure at the electrode surface.With a porous morphology and large surface area for both efficient exposure of Pd nanoparticles and enhanced electrolyte-reactant diffusion,a sensitive enzymeless sensor of hydrogen peroxide (H2O2) is constructed.Compared with the nonporous Pd/ PDDA/GR,the Pd/PDDA/PGR displays high electrocatalytic activity towards H2O2,exhibiting a high sensitivity of 57.7 μAm M-1 and lowdetection limit of 0.9 μM towards the reduction of H2O2.The improved activity and simple preparation method makes Pd/PDDA/PGR promising for being developed as an attractive robust and new electrode material for electrochemical sensor and biosensor fabrication.
Pd nanoparticle Porous graphene Hydrogen peroxide Nonenzymatic sensor One-step reduction
Wanyi Xue Xiangjie Bo Ming Zhou Liping Guo
Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province,Department of Chemistry,Northeast Normal University,5268 Renmin Street,Changchun,Jilin Province 130024,PR China
国际会议
南京
英文
204-211
2016-12-23（万方平台首次上网日期，不代表论文的发表时间）