Abstract
A new portable molecular imprinting polymer (MIP)-SERS nanoprobe is fabricated by a convenient electrochemical method. Single-layered MoS2 is electrochemically reduced on a screen-printed electrode as the scaffold. Functional monomers o-phenylenediamine (oPD), template theophylline (THP), and SERS-active Au nanoparticles (AuNPs) are then one-step electropolymerized on the scaffold. The morphology of the nanoprobe is found to be a three-dimensional and porous structure. The abundant AuNPs with the size of 45~50 nm are trapped within the growing MIP instead of being confined to the surface. The thickness of MIP film is calculated to 25.1 nm. The nanoprobe displays a strong SERS effect for THP using 532 nm as excitation wavelength with a detection limit (LOD) of 0.01 nM. The SERS peak intensity at 1487 cm−1 increases linearly with the concentration of THP in the range 0.1 nM to 0.1 mM. After the template is removed, the imprint-removed nanoprobe is generated for selective binding of THP. The re-binding kinetics study implies the portable MIP-SERS nanoprobe can reach the adsorption equilibrium within 8 min. This nanoprobe exhibits low SERS interference for structural analogues theobromine (THB) and caffeine (CAF). The nanoprobe was employed to THP determination in tea drink samples, with recoveries ranging from 99.0 to 102.0% and relative standard deviations of < 5.0%.
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Acknowledgments
Thank you very much to Yi-Tao Long’s group for providing home-made SPEs.
Funding
This research was supported by the National Natural Science Foundation of China (Nos. 21707092 and 21975161), Shanghai Excellent Technology Leaders Program (No. 17XD1424900), the Science and Technology Commission of Shanghai Municipality Project (18090503800), Natural Science Foundation of Shanghai (17ZR1441700), Shanghai Education Development Foundation and Shanghai Municipal Education Commission of Shuguang Program (No. 18SG52), and Collaborative Innovation Fund of SIT (XTCX2019-2).
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Li, YT., Yang, YY., Sun, YX. et al. Electrochemical fabrication of reduced MoS2-based portable molecular imprinting nanoprobe for selective SERS determination of theophylline. Microchim Acta 187, 203 (2020). https://doi.org/10.1007/s00604-020-4201-3
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DOI: https://doi.org/10.1007/s00604-020-4201-3