Citation: Gao Feng, Song Juan, Zhang Bin, Tanaka Hidekazu, Gao Fei, Qiu Weiwei, Wang Qingxiang. Synthesis of core-shell structured Au@Bi₂S₃ nanorod and its application as DNA immobilization matrix for electrochemical biosensor construction[J]. Chinese Chemical Letters, ;2020, 31(1): 181-184. doi: 10.1016/j.cclet.2019.04.056 shu

Synthesis of core-shell structured Au@Bi₂S₃ nanorod and its application as DNA immobilization matrix for electrochemical biosensor construction

Gao Feng ^a,c,*, ,
Song Juan ^a ,
Zhang Bin ^a ,
Tanaka Hidekazu ^b ,
Gao Fei ^a ,
Qiu Weiwei ^a,b ,
Wang Qingxiang ^a

a.
Department of Chemistry and Environment Science, Minnan Normal University, Zhangzhou 363000, China
b.
Department of Chemistry, Graduate School of Science and Engineering, Shimane University, Matsue, Shimane 690-8504, Japan
c.
Key Laboratory of Sensor Analysis of Tumor Marker Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

fgao1981@126.com

Received Date: 2 March 2019
Revised Date: 18 April 2019
Accepted Date: 18 April 2019
Available Online: 19 January 2019

Figures(3)

The core-shell structured Au@Bi₂S₃ nanorods have been prepared through direct in-situ growth of Bi₂S₃ at the surface of pre-synthesized gold nanorods. The product was characterized by X-ray diffraction, transmission electron microscopy and energy-dispersive X-ray spectroscopy. Then the obtained Au@Bi₂S₃ nanorods were coated onto glassy carbon electrode to act as a scaffold for fabrication of electrochemical DNA biosensor on the basis of the coordination of -NH₂ modified on 5'-end of probe DNA and Au@Bi₂S₃. Electrochemical characterization assays demonstrate that the Au@Bi₂S₃ nanorods behave as an excellent electronic transport channel to promote the electron transfer kinetics and increase the effective surface area by their nanosize effect. The hybridization experiments reveal that the Au@Bi₂S₃ matrix-based DNA biosensor is capable of recognizing complementary DNA over a wide concentration ranging from 10 fmol/L to 1 nmol/L. The limit of detection was estimated to be 2 fmol/L (S/N=3). The biosensor also presents remarkable selectivity to distinguish fully complementary sequences from basemismatched and non-complementary ones, showing great promising in practical application.
- DNA biosensor,
- Au@Bi₂S₃ nanorods,
- Electrochemical impedance spectroscopy,
- Core-shell structure,
- Bi³⁺-N bond,
- Probe immobilization
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Synthesis of core-shell structured Au@Bi2S3 nanorod and its application as DNA immobilization matrix for electrochemical biosensor construction

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通讯作者: 陈斌, bchen63@163.com

Synthesis of core-shell structured Au@Bi₂S₃ nanorod and its application as DNA immobilization matrix for electrochemical biosensor construction