Electrodeposition of Platinum Nanoparticles on MgAl-layered Double Hydroxide Modified Indium Tin Oxide Electrode for Electrochemical Glucose Biosensor†

doi:10.7503/cjcu20150881

Abstract

Abstract:

MgAl-layered double hydroxide(MgAl-LDH) nanoparticles were synthesized by separate nucleation and aging steps. The MgAl-LDH nanoparticles were then immobilized on the surface of clean indium tin oxide(ITO) electrode. Electrodeposition of platinum nanoparticles(PtNPs) on the MgAl-LDH modified ITO electrode was carried out by electrochemical reduction of PtC $l 6 2 -$ . The obtained PtNPs/MgAl-LDH modified ITO electrodes exhibited high electrocatalysis activity for H₂O₂. After the glucose oxidase(GOD) was further immobilized on the above modified electrode, such prepared electrode was employed as the enzyme electrode for glucose detection. The results showed that the GOD/PtNPs/MgAl-LDH modified ITO electrodes had obviously enhanced the response sensitivity of the glucose biosensor and lowered the detection limit when detecting the H₂O₂ liberated in the enzymatic reaction between GOD and glucose.

Key words: Platinum nanoparticles, MgAl-layered double hydroxide, Electrodeposition, Electrochemical glucose biosensor

CLC Number:

O657.1

TrendMD:

XU Liang, LIN Youqin, CHEN Xu, LU Yanluo, YANG Wensheng. Electrodeposition of Platinum Nanoparticles on MgAl-layered Double Hydroxide Modified Indium Tin Oxide Electrode for Electrochemical Glucose Biosensor^†[J]. Chem. J. Chinese Universities, 2016, 37(3): 442.

Figures/Tables 4

Fig.1 SEM image(A), EDS spectrum(B), XRD pattern(C) and N2-sorption isotherm(D) of the MgAl-LDH nanoparticles

Fig.2 SEM images of PtNPs/MgAl-LDHs/ITO electrode(A), PtNPs/ITO electrode(B) and XRD pattern of PtNPs/MgAl-LDHs/ITO electrode(C) Inset of (A): EDS spectrum of PtNPs/MgAl-LDHs/ITO electrode.

Fig.3 Cyclic voltammograms of PtNPs/MgAl-LDHs/ITO electrode(A), bare ITO(B) and PtNPs/ITO electrode(C) in 0.1 mol/L PBS(pH=7.0) in the absence(a) and presence(b) of 2 mmol/L H2O2 at scan rate of 0.05 V/s and chronoamperometric responses of PtNPs/ITO electrode(a) and PtNPs/MgAl-LDHs/ITO electrode(b) in 0.1 mol/L PBS(pH=7.0) on succession injecting the various concentration H2O2 at working potential of 0.50 V(D)Inset of (D): the magnified part of the curve marked with red square.

Fig.4 Amperometric response of GOD/PtNPs/MgAl-LDHs/ITO electrode in 0.1 mol/L PBS(pH=7.0) on succession injecting the various concentration of glucose at an applied potential of 0.50 V(A) and the corresponding calibration curve of the biosensor for glucose(B)Inset of (A): the magnified part of the curve marked with red square.

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