Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (4): 20210688.doi: 10.7503/cjcu20210688

• Analytical Chemistry • Previous Articles     Next Articles

Solution-gated Graphene Field Effect Transistor Sensor Based on Crown Ether Functionalization for the Detection of Mercury Ion

CAO Lei2, CHEN Meijun2, YUAN Gang2, CHANG Gang3, ZHANG Xiuhua2, WANG Shengfu2, HE Hanping1,2()   

  1. 1.State Key Laboratory of Biocatalysis and Enzyme Engineering
    2.College of Chemistry and Chemical Engineering
    3.College of Materials Science and Engineering,Hubei University,Wuhan 430062,China
  • Received:2021-09-24 Online:2022-04-10 Published:2021-12-20
  • Contact: HE Hanping E-mail:hehanping@hubu.edu.cn
  • Supported by:
    the Open Project Funding of the State Key Laboratory of Biocatalysis and Enzyme Engineering, China(SKLBEE2020016);the National Natural Science Foundation of China(52171177)

Abstract:

Hg2+ is a heavy metal with bioaccumulation and toxicity, causing serious damage to the environment and human health. Therefore, it is very necessary to develop a convenient Hg2+ sensor. Because of the excellent performance of graphene field-effect transistors, this work prepared a solution-gated graphene field effect transistor (SGGT) sensor with crown ether functionalized gate. The selectivity of the transistor sensor was achieved through the size effect of crown ether and the chelation of N and S atoms on the crown ether, which makes the sensor recognize Hg2+ specifically. The research showed that the SGGT sensor is more sensitive than traditional electrochemistry due to its inherent signal amplification function, which is 2—3 orders of magnitude lower, and the detection limit is as low as 1×10-12 mol/L in this study. In the detection range of 1×10-12—1×10-7 mol/L, the result exhibited an excellent linear relationship between the change value of the Dirac point and the logarithm of the target concentration. Moreover, it showed extremely high selectivity to Hg2+. The test of the real samples in the lake water was satisfactory, in which the detection standard deviation of Hg2+ is 1.10%—3.77%. The study indicated that the transistor sensor can detect Hg2+ in complex samples with high selectivity and sensitivity.

Key words: Solution-gated graphene transistor(SGGT), Graphene, Crown ether, Hg2+

CLC Number: 

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