Cr(VI)-Responsive Ink with Four-Dimensional Printing of an Ultracompact Hydrogel Optical Fiber Microsensor

IF 8.2 1区化学 Q1 CHEMISTRY, ANALYTICAL

ACS Sensors Pub Date : 2025-02-07 DOI:10.1021/acssensors.4c03403

Haoqiang Huang, Dezhi Zhu, Ying Wang, Dejun Liu, Weijia Bao, Bao Chai, Li Zhang, Yiping Wang, Changrui Liao

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Abstract

Hydrogel is emerging as a promising material for smart sensors due to its remarkable stimuli-responsiveness and biocompatibility. However, traditional methods like ultraviolet curing or imprinting could not yield ultracompact hydrogel microstructures with sophisticated design and controllable morphology, posing challenges in developing highly integrated microfluidic sensors. With the advanced femtosecond laser (Fs) direct writing technology, an intelligent hydrogel optical microsensor is prepared for real-time monitoring of trace hexavalent chromium ions [Cr(VI)] in water. First, a Cr(VI)-responsive hydrogel ink containing 3-acrylamidopropyl-trimethyammonium chloride (ACTC) is developed, boasting a printing resolution of ∼250 nm. Subsequently, a fiber-tip Fabry–Perot cavity (FPC) Cr(VI) microsensor is printed using a multimaterial TPP strategy. The sensor shows an ultracompact size (∼100 μm) and high specificity for detecting trace liquid samples. The detection limit of 1.48 × 10^–9 M makes it suitable for rapidly detecting trace Cr(VI). The on-chip direct writing of smart hydrogel MEMS sensors provides an ultracompact detection platform for environmental protection and analytical science fields.

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来源期刊

ACS Sensors Chemical Engineering-Bioengineering

CiteScore

14.50

自引率

3.40%

发文量

372

期刊介绍： ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.