基于聚合物点的光电化学 pH 传感器：简单、高灵敏度和宽范围 pH 测量。
A Polymer Dots-Based Photoelectrochemical pH Sensor: Simplicity, High Sensitivity, and Broad-Range pH Measurement.
机构信息
State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing , Jiangsu 210023 , China.
Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States.
出版信息
Anal Chem. 2018 Jul 17;90(14):8300-8303. doi: 10.1021/acs.analchem.8b02291. Epub 2018 Jul 3.
This work reported the photoelectrochemical (PEC) pH sensor for sensitive and broad-range pH measurement on the basis of semiconducting polymer dots (Pdots). The sensor was fabricated by immobilizing Pdots onto the surface of indium tin oxide (ITO). Experimental results revealed that the carboxylic acid groups of Pdots were sensitive to pH variation, which could result in conformational changes and further diffusion of carriers. Besides, different pH value could change the redox properties of the Pdots, and the photocurrent response was hence altered by the carriers produced on the Pdots. Further results demonstrated that the developed sensor exhibited variable photocurrent sensitively by responding to different pH values. This pH sensor is of high sensitivity, stability, and reversibility, which provides a bright prospect for future pH measurements in the bioanalytical field.
本工作报道了一种基于半导体聚合物点（Pdots）的光电化学（PEC）pH 传感器，用于灵敏和宽范围的 pH 测量。该传感器是通过将 Pdots 固定在氧化铟锡（ITO）表面上制备的。实验结果表明，Pdots 的羧酸基团对 pH 值的变化敏感，这可能导致构象变化和载体的进一步扩散。此外，不同的 pH 值可以改变 Pdots 的氧化还原性质，从而改变由 Pdots 产生的载流子的光电流响应。进一步的结果表明，所开发的传感器通过响应不同的 pH 值表现出可变的光电流敏感性。该 pH 传感器具有高灵敏度、稳定性和可逆性，为生物分析领域未来的 pH 测量提供了广阔的前景。
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