| Summary: | 碩士 === 國立臺灣大學 === 應用物理研究所 === 105 === A highly sensitive glucose biosensor based on graphene/ZnO/p-Si heterojunctions is demonstrated. Its sensing mechanism makes use of the large variation in the Fermi energy of graphene upon direct electron transfer of glucose oxidase at the presence of glucose molecules, with a film of ZnO acting as a sieve layer to block the carriers from transferring into the underlying semiconductor layer, resulting in a superb detection sensitivity. Through measurements of the current-voltage characteristics and time dependence of the changed current, this unique structure responds to glucose concentrations from as low as 0.1 pM to 100 μM range, which outperforms the best value ever reported by more than three orders of magnitude. Furthermore, we demonstrate the self-powered capability of this newly designed biosensor at room light illumination level, without compromising its sensitivity and dynamic range of detection. Altogether, this device presents with an excellent performance that surpasses all current glucose detection devices used in medical control, representing a novel possibility for easy and painless monitoring of blood glucose for patients with diabetes mellitus.
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