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A Photoelectrochemical Biosensor Fabricated using Hierarchically Structured Gold Nanoparticle and MoS 2 on Tannic Acid Templated Mesoporous TiO 2
Author(s) -
Çakıroğlu Bekir,
Özacar Mahmut
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900433
Subject(s) - materials science , biosensor , mesoporous material , glucose oxidase , anatase , tannic acid , nanotechnology , nanocomposite , nanoparticle , electrode , photocurrent , colloidal gold , chemical engineering , photocatalysis , chemistry , catalysis , optoelectronics , organic chemistry , engineering
In a tannic acid assisted synthesis of mesoporous TiO 2 , tannic acid was used as a cost effective and non‐toxic template for pore formation. Meanwhile, a gold nanoparticles (Au NPs) deposited TiO 2 nanocomposite was coated on an indium tin oxide electrode for the fabrication of a photoelectrochemical (PEC) biosensing system. Upon the formation of anatase structure, the electrode was coated with MoS 2 for effective visible light absorption. The mesoporous structure led to an enhanced surface area by improving Au NPs and glucose oxidase adsorption. Incorporation of Au NPs led to an enhanced photonic efficiency due to the generation of Schottky barriers. The obtained nanocomposite was used for the light‐driven, real‐time, and selective PEC glucose sensing. Under visible light irradiation, the enzyme immobilized electrodes yielded significant photocurrent improvement owing to the releasing electron donor H 2 O 2 . The obtained PEC biosensor demonstrated acceptable reproducibility and stability with a sensitivity of 4.42 μA mM −1 cm −2 and a low detection limit of 1.2 μM glucose. Also, the linear measurement range was found to be 0.004–1.75 mM glucose. The results indicated that the proposed production method of mesoporous TiO 2 will pave the way for a green chemistry based porous material production, along with the extension of the implementation of semiconductors in PEC biosensing systems.