Journal
ELECTROCHIMICA ACTA
Volume 107, Issue -, Pages 656-663Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.06.015
Keywords
Electrodeposition; Copper nanodendrites; Graphene; Nitrite; Non-enzymatic sensor
Categories
Funding
- National Natural Science Foundation of China [81127001, 81273993]
- Science and Technology Plan Project of Tianjin [11ZCGHHZ01300, 11ZCKFSY07000]
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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 mu M nitrite (signal-to-noise ratio, S/N = 3), the high sensitivity of 214 mu A mM(-1) cm(-2), and the wide linear range from 1.25 x 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. (C) 2013 Elsevier Ltd. All rights reserved.
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