光电流
生物传感器
异质结
光电子学
电致变色
适体
化学
电极
纳米技术
材料科学
遗传学
生物
物理化学
作者
Suci Meng,Yuye Li,Nianguo Dong,Shuda Liu,Chang Liu,Qingfa Gong,Chao Zuo,Kaituo Jiang,Xia Li,Dong Liu,Tianyan You
标识
DOI:10.1021/acs.analchem.3c04001
摘要
Reversible electrochromic supercapacitors (ESCs) have attracted considerable interest as visual display screens. The use of ESCs in combination with a photoelectrochemical (PEC) biosensor promises to improve the detection efficiency. Herein, a visual PEC biosensor is developed by introducing a circuit module between a PEC-sensing platform (PSP) and a reversible ESC for Cry1Ab protein detection. In PSP, a type II MgTi2O5/CdSe heterojunction effectively drives charge separation by their cross-matched band gap structures, generating an amplified photocurrent. Next, the circuit module is designed to connect the PSP and ESC, realizing the signal conversion from photocurrent to voltage. ESC, as a visual display screen, produces reversible color changes with different voltages. As the concentration of Cry1Ab increases, the photocurrent decreases due to the specific binding between the aptamer and Cry1Ab in PSP, while the color of the reversible ESC changes from green to blue. To improve the integrity of the device, a portable PEC biosensor is further constructed via three-dimensional printing for dual-modal Cry1Ab protein detection, thus collecting both PEC and visual signals. The linear ranges are 0.3–3000 ng mL–1 for PEC mode and 1–1000 ng mL–1 for visual mode. This work presents a portable, efficient, sensitive, and visualized detection system, providing an important reference for practical visualization applications.
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