Graphene/γ-AlOOH Hybrids as an Enhanced Sensing Platform for Ultrasensitive Stripping Voltammetric Detection of Pb(II)

doi:10.1007/s40242-015-5006-5

Abstract

Abstract:

The reduced graphene oxide(RGO)/γ-AlOOH hybrids with different γ-AlOOH contents were successfully prepared via a facile one-pot hydrothermal method. In these hybrids, RGO acts as a conductive linker for improving electron transport, and γ-AlOOH nanoplatelets help to adsorb the target metal ions on the electrode surface, thus facilitating the electrochemical behavior of the hybrids. The sensitivity of as-prepared RGO/γ-AlOOH hybrids toward Pb(II) was tested by square wave anodic stripping voltammograms(SWASV) and the mass ratio of graphene to γ-AlOOH was optimized to improve the sensing performance of RGO/γ-AlOOH hybrids. Owing to the superior absorbability of γ-AlOOH for heavy metal ions and excellent electrical conductivity of graphene, the detection limit of the hybrids for heavy metal ions was found to be as low as 1.5×10^-11 mol/L with optimized γ-AlOOH content in the hybrids. The experimental conditions, such as pH value, mass of electrode material, and deposition time were also investigated and optimized. The as-prepared RGO/γ-AlOOH hybrids demonstrate high electrochemical activity and good sensing performance, which offers an alternative platform for the electrochemical sensors.

Key words: Graphene, γ-AlOOH, Hybrid, Heavy metal ion, Electrochemical sensor

FAN Wei, MIAO Yue'e, LIU Tianxi. Graphene/γ-AlOOH Hybrids as an Enhanced Sensing Platform for Ultrasensitive Stripping Voltammetric Detection of Pb(II)[J]. Chemical Research in Chinese Universities, 2015, 31(4): 590-596.

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