Glucose-responsive hydrogel electrode for biocompatible glucose transistor.
In this paper, we propose a highly sensitive and biocompatible glucose sensor using a semiconductor-based field effect transistor (FET) with a functionalized hydrogel. The principle of the FET device contributes to the easy detection of ionic charges with high sensitivity, and the hydrogel coated on the electrode enables the specific detection of glucose with biocompatibility. The copolymerized hydrogel on the Au gate electrode of the FET device is optimized by controlling the mixture ratio of biocompatible 2-hydroxyethylmethacrylate (HEMA) as the main monomer and vinylphenylboronic acid (VPBA) as a glucose-responsive monomer. The gate surface potential of the hydrogel FETs shifts in the negative direction with increasing glucose concentration from 10 μM to 40 mM, which results from the increase in the negative charges on the basis of the diol-binding of PBA derivatives with glucose molecules in the hydrogel. Moreover, the hydrogel coated on the gate suppresses the signal noise caused by the nonspecific adsorption of proteins such as albumin. The hydrogel FET can serve as a highly sensitive and biocompatible glucose sensor inin vivoorex vivoapplications such as eye contact lenses and sheets adhering to the skin.
PROVIGATE Inc., Department of Research and Development , Tokyo , Japan.
Taira
T
Kajisa
Department of Materials Science and Engineering, Graduate School of Engineering, The University of Tokyo , Tokyo , Japan.
Toshiya
T
Sakata
208 Sensors and actuators; 30 Bio-inspired and; 600 Others; Field effect transistor; biocompatibility; biomedical materials; glucose; hydrogel; phenylboronic acid