Growth of Li Doped Bismuth Oxide Nanorods and its Electrochemical Performance for the Determination of L-Cysteine

Yong Wen,Li-Zhai Pei,Tian Wei

doi:10.1590/1980-5373-mr-2016-0711

Yong Wen, Li-Zhai Pei + Show 1 more

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https://doi.org/10.1590/1980-5373-mr-2016-0711

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Abstract

Li doped bismuth oxide nanorods have been prepared using sodium bismuthate and Li acetate. X-ray diffraction (XRD) pattern shows that the nanorods are composed of monoclinic Bi2O4 and cubic LiBi12O18.50 phases. Scanning electron microscopy (SEM) observation shows that the nanorods have the length and diameter of 1-5 µm and 50-350 nm, respectively. The formation of the Li doped bismuth oxide nanorods is closely relative to the hydrothermal conditions. The electrochemical performance for the determination of L-cysteine based on a Li doped bismuth oxide nanorods modified glassy carbon electrode (GCE) has been developed. The CV peak current increases obviously and linearly with increasing the scan rate. Under the optimal conditions, Li doped bismuth oxide nanorods modified GCE exhibits good analytical performance with good reproducibility and stability. The linear range of L-cysteine is 0.0001-2 mM and the detection limit is 0.36 µM and 0.17 µM for cvp1 and cvp2, respectively.

Highlights

In recent years, nanoscale bismuth oxide finds more application in a variety of fields due to large surface area which provides a large number of adsorption sites.[1,2] Nanoscale bismuth oxide has attracted much attention owing to electrochemical catalysis and electrochemical stability for the analysis of biological molecules.[3,4] Glassy carbon electrode (GCE) modified with nanoscale Bi-containing materials, such as zinc bismuthate nanorods,[5] aluminium bismuthate nanorods,[6] Bi2O3 nanorods[7] and Bi2O3 microscale and nanoscale particles[8] has shown good catalytic activity for the electrochemical reduction or oxidation of various biological molecules
The crystal structure of the products obtained from the hydrothermal conditions of 180 oC for 24 h was characterized by X-ray diffraction (XRD) analysis
Li doped bismuth oxide nanorods with monoclinic Bi2O4 and cubic LiBi12O18.50 phases have been synthesized by a hydrothermal process without any surfactants and templates

Summary

Introduction

Nanoscale bismuth oxide finds more application in a variety of fields due to large surface area which provides a large number of adsorption sites.[1,2] Nanoscale bismuth oxide has attracted much attention owing to electrochemical catalysis and electrochemical stability for the analysis of biological molecules.[3,4] Glassy carbon electrode (GCE) modified with nanoscale Bi-containing materials, such as zinc bismuthate nanorods,[5] aluminium bismuthate nanorods,[6] Bi2O3 nanorods[7] and Bi2O3 microscale and nanoscale particles[8] has shown good catalytic activity for the electrochemical reduction or oxidation of various biological molecules. The performance of the materials can be improved by doping metal ions.[9] It has been observed that the electrochemical performance of the electrodes may be improved by doping metal ions, such as Li ions.[10,11] it is important to explore the synthesis of the Li doped bismuth oxide nanorods for improving the electrochemical performance to detect biological molecules. The mechanical attachment method was used to modify the surface of the GCE by attaching the Li doped bismuth oxide nanorods. The electrochemical performance of the Li doped bismuth oxide nanorods modified GCE for the determination of L-cysteine in KCl solution has been investigated. The results show that the nanorods modified GCE can act as a promising electrochemical platform for the electrochemical determination of L-cysteine

Experimental

Results and Discussion

Conclusions