Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 1, Pages 2211-2218Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c17832
Keywords
Hg2+ sensing; surface-enhanced Raman scattering; microfluidic chip; in situ detection; photoreduction
Funding
- National Natural Science Foundation of China [11774245, 11704266, 11804237]
- Beijing Natural Science Foundation [Z190006]
- National Key Research and Development Program of China [2021YFA1400800]
- National Youth Talent Support Program
- Training Program of the Major Research Plan of Capital Normal University
- Postgraduates innovation project of Capital Normal University
- Scientific Research Base Development Program of Beijing Municipal Commission of Education
- Beijing Key Laboratory of Metamaterials and Devices
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A surface-enhanced Raman scattering (SERS) substrate functionalized with I- was developed for rapid and sensitive Hg2+ sensing on a microfluidic platform. The sensor demonstrated fast response, high sensitivity, and good selectivity towards Hg2+, with detectable concentrations as low as 1 fM. Real water sample detection showed promising results for on-site Hg2+ detection.
Mercury(II) ions are causing serious environmental pollution and health damage. Developing a simple, rapid, and sensitive sensor for Hg2+ detection is of great significance. Herein, we demonstrate an I--functionalized surface-enhanced Raman scattering (SERS) substrate for rapid and sensitive Hg2+ sensing on a highly integrated microfluidic platform. Based on the combination reaction between I- and Hg2+, the Hg2+ sensing is achieved via the SERS intensity turn-off strategy, where Hg2+ precipitation is formed on an SERS substrate interface, dissociating the Raman reporters that coadsorbed with I-. Owing to the strong binding constant between I- and Hg2+, our I--functionalized substrate demonstrates a very fast sensing response (similar to 150 s). Through reliable in situ SERS detection, a robust calibration curve between the turn-off' signal and IgC is obtained in a broad concentration range of 10(-)(9) to 10(-13) M. Additionally, the detectable Hg2+ concentration can be as low as 1 fM. The good selectivity toward Hg2+ is also verified by testing about a dozen common metal ions in water, such as K+, Na+, Ca2+, Mg2+, and so forth. Furthermore, we apply the SERS sensor for real tap and lake water sample detection, and good recoveries of 113, 97, and 107% are obtained. With its advantages of high integration, simple preparation, fast response, high sensitivity, and reliability, the proposed I--functionalized SERS sensor microfluidic chip can be a promising platform for real-time and on-site Hg2+ detection in natural water.
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