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Updated: Apr 6, 2026
Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
Host-guest assisted carbon quantum dots/WS2 photoelectrochemical solution-gated graphene field-effect transistor for
Hairui Wang1, Yufeng Zhang1, Na Xu1
1Key Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of Education, College of Chemistry, Jilin Normal University, Changchun 130103, China.
Abstract:
An innovative photoelectrochemical solution-gated graphene transistor (PEC-SGGT) was developed in this work for the sensitive detection of diquat (DQ). In this system, DQ acts as a molecular bridge that directs the pre-formation of a DQ@carbon quantum dots (DQ@CQDs) complex in solution and subsequently guides its assembly onto the WS2 quantum dots-gold nanoparticles-cyclodextrin (WS2/Au/CD) substrate. This process leads to the formation of a WS2/Au/CD@DQ/CQDs photosensitizer with enhanced photoelectronic properties. When integrated as a PEC gate electrode, this material effectively modulates the channel current of the PEC-SGGT device, enabling accurate quantification of DQ with an ultralow detection limit of 0.45 pM. The sensing strategy combines host-guest recognition with electrostatic self-assembly to achieve selective DQ capture while generating robust, device-compatible gating signals. Overall, this work presents a promising paradigm for the ultrasensitive detection of small-molecule toxins.
