Ferric ion immobilized on three-dimensional nanoporous gold films modified with self-assembled monolayers for electrochemical detection of hydrogen peroxide.
A fast, simple square wave potential method is developed for the fabrication of a three-dimensional (3D) nanoporous gold (NPG) film. The nanostructures are characterized and confirmed by scanning electronic microscopy (SEM) and cyclic voltammetry (CV). The nanostructures modified with self-assembled monolayers (SAMs) are employed as an electrode substrate to immobilize inorganic iron(III) ion. After immobilization, iron(III) ion undergoes an effective direct electron transfer reaction with a pair of well-defined redox peak at -256 ± 10 mV (pH 7.0). The iron(III) ion modified electrode displays the excellent electrocatalytic performance for reduction of hydrogen peroxide, and thus can be used as an electrochemical sensor for detecting hydrogen peroxide with a low detection limit (1.0 × 10(-9) M), a wide linear range (9.0 × 10(-7)~5.0 × 10(-4) M), as well as good stability, selectivity and reproducibility.
Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210046, PR China.
Min
M
Zheng
Pan
P
Li
Chen
C
Yang
Hui
H
Zhu
Yu
Y
Chen
Yawen
Y
Tang
Yiming
Y
Zhou
Tianhong
T
Lu
D020148:Butyric Acid / Q000737:chemistry; D002384:Catalysis; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004579:Electron Transport; D006046:Gold / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D058608:Nanopores; D010084:Oxidation-Reduction; D013997:Time Factors
D020148:Butyric Acid; D006046:Gold; D006861:Hydrogen Peroxide; D007501:Iron