Modulating Charge Carrier Efficient Separation Enabled by Lewis Base Modification in Paper-based Photoelectrochemical Sensor |
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| Authors: | Haihan Yu Shubo Sun Xiaoran Tan Lina Zhang Chaomin Gao |
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| Institution: | 1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong, 250022 P.R. China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022 P.R. China |
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| Abstract: | The separation efficiency of charge carriers determines the analytical sensitivity of the paper-based photoelectrochemical sensor. Herein, the Lewis base modification strategy is proposed to promote the carrier separation through an in-situ ion exchange method. Firstly, three-dimensional paper-based hierarchically TiO2 (PHT) arrays are prepared with the one-step hydrothermal method. With the aid of Lewis base, the photo-induced charge separation efficiency and the photocurrent signal are obviously increased. Ultimately, sensitive sensing of prostate specific antigen (PSA) is achieved and the linear range is 1 pg/mL–100 ng/mL with the detection limitation of 0.3 pg/mL. |
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| Keywords: | paper-based sensing photoelectrochemical charge separation TiO2 |
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