Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1768.doi: 10.7503/cjcu20200700

• Chemical Biology • Previous Articles     Next Articles

Fabrication of Biosensor Based on “Beads-on-a-String” Shaped Composite Nano-assembly Modified Screen Printed Electrode

XU Mengyi, HUANG Xuewen, LI Xiaojie, WEI Wei, LIU Xiaoya()   

  1. School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2020-09-22 Online:2021-06-10 Published:2021-06-08
  • Contact: LIU Xiaoya E-mail:lxy@Jiangnan.edu.cn
  • Supported by:
    the Postgraduate Resesrch and Practice Innovation Program of Jiangsu Province, China(KYCX20_1934)

Abstract:

An amphiphilic random copolymer poly(AAPBA-co-FMA-co-HEMA) (PAFH) was synthesized with 3-acrylamidophenylboronic acid(AAPBA), furfuryl methacrylate(FMA) and 2-hydroxyethyl methacrylate(HEMA) as monomers. Thereafter, the functional polymer covalently grafted carbon nanotubes(PAFH-CNTs) was fabricated via Diels-Alder reaction between PAFH and carbon nanotubes(CNTs). They were co-assembled to form composite nano-assemblies(PAFH-CNTs NCs). The morphology and stability of PAFH-CNTs NCs were measured by scanning electron microscope(SEM) and ultraviolet spectrophotometer. The results showed that PAFH-CNTs NCs has a zero dimensional/one dimensional(0D/1D) “beads-on-a-string” structure with long-term stability. Finally, PAFH-CNTs NCs were modified on the surface of screen-printed carbon electrode(SPCE), and the horseradish peroxidase(HRP) was introduced to construct a biosensor to detect hydrogen peroxide(H2O2). SEM, transmission electron microscopy(TEM) and electrochemical workstation were used to characterize the morphology and sensing performance of the biosensor. It was illustrated that PAFH-CNTs NCs could form a nanonetwork with high specific surface area on the SPCE surface. The constructed sensor has a good linear response to H2O2 within the range of 0.02—3.48 mmol/L, and the sensitivity and detection limit are 63.98 μA·(mmol/L)-1·cm-2 and 4.2 μmol/L, respectively. Furthermore, it also has excellent stability and selectivity, which has application value for testing actual samples.

Key words: Amphiphilic random copolymer, Carbon nanotubes, Composite nano-assembly, H2O2, Biosensor

CLC Number: 

TrendMD: