Three-dimensional nanoporous Au films as high-efficiency enzyme-free electrochemical sensors
By Xi Ke and Zhihao Li and Lin Gan and Jie Zhao and Guofeng Cui and William Kellogg and Daniel Matera and Drew Higgins and Gang Wu
Published in Electrochimica Acta
2015
Abstract
Herein we develop an enzyme-free electrochemical sensor for hydrogen peroxide (H2O2) and hydrazine (N2H4) by preparing three-dimensional nanoporous gold (NPG) supported on three dimensional Ni foam. The NPG@Ni foam hybrid electrode was prepared via electrodeposition of an AuSn alloy film on a Ni foam substrate, followed by a chemical dealloying process to leach the Sn component. The morphology and structure of the as-prepared NPG@Ni foam hybrid were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectrum (EDS). The as-prepared hybrid electrodes showed high sensitivity and selectivity for the detection of both \H2O2\ and N2H4. The non-enzymatic sensor exhibits a linear response for \H2O2\ and \N2H4\ in the range of 20