Real-time monitoring of geosmin based on an aptamer-conjugated graphene field-effect transistor

Title
Real-time monitoring of geosmin based on an aptamer-conjugated graphene field-effect transistor
Authors
송현석박선주서성은김경호이상훈김진영하시영이승환권오석
Keywords
Graphene field-effect transistor; Portable nanobiosensor; Geosmin; Odor compound; Real-time monitoring
Issue Date
2021-02
Publisher
Biosensors and bioelectronics
Citation
VOL 174, 112804
Abstract
In this paper, we propose a novel field-effect transistor (FET) using graphene, which is a two-dimensional (2D) nanomaterial, capable of evaluating water quality, and immobilizing the surface of a graphene micropatterned transistor with a highly responsive bioprobe for a water contamination indicator, geosmin, with high selectivity. A high-quality bioprobe-immobilized graphene FET (GFET) was fabricated for the real-time monitoring of geosmin using a liquid-gate measurement configuration. Immobilization was confirmed by measuring the change in the electrical characteristics of the platform (slope of the current-voltage (I?V) curve) and fluorescence images. In addition, a selectivity test showed remarkable implementation of the highly sensitive sensing platform with an insignificant signal when a nontarget was added. Using the fabricated device, the linear range for geosmin detection was determined to be from 0.01 nM - 1 μM with a detection limit of 0.01 nM. In addition, geosmin concentrations as low as 10 nM could be determined from river water samples with the sensor platform. This sensor can be utilized to immediately determine the presence of odorous substances by analyzing a water supply source without additional pretreatment. Another advantage is that the sensor device is a promising tool that does not have special equipment that requirs careful maintenance. In addition, the device provides a new platform for detecting harmful substances in various water sources by varying the bioprobes that are empolyed.
URI
http://pubs.kist.re.kr/handle/201004/72722
ISSN
0956-5663
Appears in Collections:
KIST Publication > Article
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