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Zhou J, Huang H, Wang Q, Li Z, Chen S, Yu J, Zhong Y, Chen J, Huang H. Extended-Gate FET Biosensor Based on GaN Micropillar Array and Polycrystalline Layer: Application to Hg 2+ Detection in Human Urine. Anal Chem 2024; 96:7577-7584. [PMID: 38696338 DOI: 10.1021/acs.analchem.4c00435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2024]
Abstract
Owing to the separation of field-effect transistor (FET) devices from sensing environments, extended-gate FET (EGFET) biosensor features high stability and low cost. Herein, a highly sensitive EGFET biosensor based on a GaN micropillar array and polycrystalline layer (GMP) was fabricated, which was prepared by using simple one-step low-temperature MOCVD growth. In order to improve the sensitivity and detection limit of EGFET biosensor, the surface area and the electrical conductivity of extended-gate electrode can be increased by the micropillar array and the polycrystalline layer, respectively. The designed GMP-EGFET biosensor was modified with l-cysteine and applied for Hg2+ detection with a low limit of detection (LOD) of 1 ng/L, a high sensitivity of -16.3 mV/lg(μg/L) and a wide linear range (1 ng/L-24.5 μg/L). In addition, the detection of Hg2+ in human urine was realized with an LOD of 10 ng/L, which was more than 30 times lower than that of reported sensors. To our knowledge, it is the first time that GMP was used as extended-gate of EGFET biosensor.
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Affiliation(s)
- Jialing Zhou
- School of Biomedical Engineering, Faculty of Medicine, Dalian University of Technology, Dalian 116024, China
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
| | - Hui Huang
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
| | - Qian Wang
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
| | - Zhirui Li
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
| | - Shunji Chen
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
| | - Jun Yu
- School of Biomedical Engineering, Faculty of Medicine, Dalian University of Technology, Dalian 116024, China
| | - Yuan Zhong
- Center for Advanced Measurement Science, National Institute of PR Metrology, Beijing 100029, China
| | - Jing Chen
- Electrical & Electronic Experimental Center, Dalian University of Technology, Dalian 116024, China
| | - Huolin Huang
- School of Optoelectronic Engineering and Instrument Science, Dalian University of Technology, Dalian 116024, China
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