安培法
过电位
联氨(抗抑郁剂)
电极
检出限
材料科学
石墨
电化学
选择性
纳米颗粒
无机化学
电化学气体传感器
复合数
电催化剂
胶体金
化学工程
纳米技术
催化作用
化学
复合材料
色谱法
有机化学
物理化学
工程类
作者
Chelladurai Karuppiah,Selvakumar Palanisamy,Shen‐Ming Chen,Sayee Kannan Ramaraj,Prakash Periakaruppan
标识
DOI:10.1016/j.electacta.2014.06.158
摘要
A highly sensitive amperometric hydrazine sensor has been developed for the first time using gold nanoparticles (Au-NPs) decorated activated graphite (AG) modified screen printed carbon electrode (SPCE). The preparation of AG and decoration of Au-NPs on AG surface involve simple electrochemical methods. AG/Au-NPs composite modified electrode shows a higher catalytic response and lower overpotential for hydrazine compared to Au-NPs decorated on activated SPCE and/or graphite SPCE. The response of the sensor for hydrazine detection lies within 2 s, indicating an excellent electrocatalytic ability of the composite electrode. The lowest limit of detection (LOD) of 0.57 ± 0.03 nM is able to be achieved using AG/Au-NPs electrode, which is the lowest LOD that has ever been reported in the literature for hydrazine. Under optimum condition, the fabricated AG/Au-NPs composite exhibits a wider linear response for hydrazine detection up to 936 μM. The sensor shows a very good sensitivity along with an excellent operational stability. The sensor proves its superior selectivity even in the presence of 1000 and 200 folds of common metal ions and biologically co-active interfering species.
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