All-solid-state flexible visualization sensor based on sandwich structure and light-induced potential variation

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2025-09-11 DOI:10.1007/s00604-025-07503-4

Zheng Wang, Jiayuan Zhu, Ying-Zhuo Shen, Cheng Ma, Hongbo Li, Wei Liu, Xiao-Ya Hu, Qin Xu

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引用次数: 0

Abstract

A novel all-solid-state flexible electrochromic sensor without liquid electrolytes and external power sources is reported which simplifies device construction and instrumentation requirement and offers high stability and energy efficiency. A polyacrylamide hydrogel was used as the solid electrolyte, and prussian blue (PB) on one end of a flexible bipolar electrode (BPE) served as the electrochromic region. Molecularly imprinted polymers (MIPs) modified on the other pole of the BPE, as electron injection regions, recognized targets and formed a sandwich structure with the aptamer functionalized light-responsive zirconium-based metal–organic frameworks (UiO-66) coated TiO₂ (Apt-UiO-66@TiO₂) quantitatively. Under ultraviolet light-irradiation, the captured TiO₂@UiO-66 triggered potential differences between the two poles of the BPE, causing the discoloration of PB. The degree of PB color change correlated with the concentration of bisphenol A (BPA) in the range 1.0 × 10^–6 to 1.0 × 10^–12 M. BPA could be quantified via the intelligent RGB analysis, and the limit of detection reaches 5.96 × 10^–13 M. The sensor has been applied to the assay of BPA in bottled water samples with satisfactory results. This all-solid-state flexible sensor can be integrated into flexible devices with enhanced portability for field applications.

Graphical Abstract

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基于夹心结构和光致电位变化的全固态柔性可视化传感器

报道了一种新型的全固态柔性电致变色传感器，该传感器无需液体电解质和外部电源，简化了器件结构和仪表要求，具有高稳定性和高能效。采用聚丙烯酰胺水凝胶作为固体电解质，柔性双极电极（BPE）一端的普鲁士蓝（PB）作为电致变色区。分子印迹聚合物（MIPs）修饰在BPE的另一端，作为电子注入区，识别目标，并与适体功能化的光响应锆基金属有机框架（UiO-66）形成三明治结构。在紫外光照射下，捕获的TiO2@UiO-66触发了BPE两极之间的电位差，导致PB变色。双酚A （BPA）浓度在1.0 × 10-6 ~ 1.0 × 10-12 m范围内与PB颜色变化程度相关，通过智能RGB分析可定量测定BPA，检测限达到5.96 × 10-13 m。该传感器已应用于瓶装水样品中BPA的检测，结果满意。这种全固态柔性传感器可以集成到灵活的设备中，增强了现场应用的便携性。图形抽象

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.