• 文献标题:   One-step synthesis of porous cuprous oxide microspheres on reduced graphene oxide for selective detection of mercury ions
  • 文献类型:   Article
  • 作  者:   FANG SM, DONG XD, ZHANG YC, KANG MM, LIU SL, YAN FF, HE LH, FENG XZ, WANG PY, ZHANG ZH
  • 作者关键词:  
  • 出版物名称:   NEW JOURNAL OF CHEMISTRY
  • ISSN:   1144-0546 EI 1369-9261
  • 通讯作者地址:   Zhengzhou Univ Light Ind
  • 被引频次:   14
  • DOI:   10.1039/c4nj01347f
  • 出版年:   2014

▎ 摘  要

In this paper, we report on the facile one-step synthesis of porous cuprous oxide microspheres on reduced graphene oxide (Cu2OMS-rGO) by synchronously reducing Cu2+ ions and GO with ascorbic acid sodium, followed by their application as electrochemical biosensors for the detection of mercury ions in water. After detailed characterization of the basic chemical components, crystal structure, surface morphology, and electrochemical properties of the Cu2OMS-rGO composites, single-stranded and thymine (T)-rich oligo-nucleotides were successively immobilized onto the surface of the composite electrode modified by Cu2OMS-rGO. Upon introduction of the target analyte, Hg2+ ions were intercalated into the DNA polyion complex membrane based on T-Hg2+-T coordination chemistry. The results show that the Cu2OMS-rGO composite has high sensitivity for the detection of Hg2+, with a detection limit of 8.62 pM within the range of 0.05 nM to 40 nM. Therefore, the Cu2OMS-rGO composite could be utilized as a novel biosensor for the detection of heavy metal ions in water or in the environment. The strategy yielded excellent selectivity of Hg2+ against other interfering metal ions. In addition, the developed DNA sensor for the determination of Hg2+ ions could be reproduced up to 10 cycles, and the recovery was approximately 95%.