石墨烯
亚硝酸盐
安培法
检出限
氧化物
电极
材料科学
电化学
铜
玻璃碳
无机化学
纳米团簇
电化学气体传感器
化学
循环伏安法
纳米技术
色谱法
冶金
有机化学
物理化学
硝酸盐
作者
Di Zhang,Yuxin Fang,Zhiying Miao,Min Ma,Xin Du,Shigehiro Takahashi,Jun‐ichi Anzai,Qiang Chen
标识
DOI:10.1016/j.electacta.2013.06.015
摘要
We have developed an effective strategy to fabricate a novel non-enzymatic nitrite sensor. Copper nanodendrites (Cu-NDs) and reduced graphene oxide (RGO) were successively deposited on glassy carbon electrode (GCE) via a simple and two-step electrodeposition method. The fabricated sensor showed an excellent electrocatalytic activity for nitrite reduction. Moreover, the effects of electrodeposition circles, Cu2+ concentration, pH value and detection potential on the current responses of Cu-NDs/RGO/GCE toward nitrite were optimized to obtain the maximal sensitivity. Under optimal experimental conditions, Cu-NDs/RGO/GCE demonstrated the low detection limit of 0.4 μM nitrite (signal-to-noise ratio, S/N = 3), the high sensitivity of 214 μA mM−1 cm−2, and the wide linear range from 1.25 × 10−3 to 13 mM. The superior response of the sensor to nitrite was mainly attributed to the enlarged surface-to-volume ratio with more electroactive sites and the synergistic effect of Cu-NDs and RGO. This work presented a feasible approach for future research in non-enzymatic amperometric sensors and other surface functionalizing.
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