Abstract
Dopamine (DA) plays an important biological role in cardiovascular, renal, hormone, central nervous systems and human metabolism. Photo-sensitive sensors studies are gained great importance in recent years due to some problems in enzyme-based sensors. In this study, photo-sensitive BiVO4@Bi2O3@g-C3N4 based sensor is fabricated for DA determination. The semiconductors use in this sensor system have important functions; g-C3N4 is a photosensitive material, δ-Bi2O3 is a stable electrode responsible for intermediate contact, and BiVO4 is a good electron conduction material due to its stable structure. DA is analyzed by BiVO4@Bi2O3@g-C3N4 photo-sensitive sensor in 0.1 M PBS medium at solutions with different concentrations. In this study, for the first time, a calibration curve is constructed from Tafel curves of solutions of different concentrations. The DA sensor is worked in a linear range of 25–750 µM. In addition, in this developed sensor, limit of detection (LOD), limit of quantification (LOQ) and sensitivity values are 0.046, 0.154 µM and 0.011 μA µM−1 cm−2, respectively. Our strategy opens a new pathway to determination of some neurotransmitter via photo-sensitive materials.
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