Abstract
A superamphiphobic surface composed of two different size ranges of TiO2 nanoparticles was simply fabricated through spraying the perfluorosilane coated TiO2 nanoparticles suspension dispersing in ethanol. The surface chemistry was finely regulated through gradient UV irradiation-induced organic compound degradation to fabricate surface with gradient solid surface energy or wettability. The fabricated surface shows good droplet sorting ability, which can successfully discriminate ethanol droplets with different concentrations. As a proof-of-concept, the biosensor application of this surface was demonstrated by using it for naked-eye ATP detection. Liquid droplets with different concentrations of ATP after ATP-dependent rolling circle amplification (RCA) can be effectively sorted by the surface. This developed biosensor methodology based on droplet sorting ability of the fabricated surface is energy-efficient and economical which is promising for biosensors, point-of-care testing, and biochemical assays.
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Funding
This work is supported by the National Basic Research Program of China (973 Program, 2015CB932600), the National Key R&D Program of China (2017YFA0208000, 2016YFF0100800), the National Natural Science Foundation of China (21525523, 21722507, 21574048, 21874121), The Fok Ying-Tong Education Foundation, China (151011).
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Published in the topical collection Young Investigators in (Bio-)Analytical Chemistry with guest editors Erin Baker, Kerstin Leopold, Francesco Ricci, and Wei Wang.
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Huang, F., Chen, Y., Wang, Y. et al. Tunable superamphiphobic surfaces: a platform for naked-eye ATP detection. Anal Bioanal Chem 411, 4721–4727 (2019). https://doi.org/10.1007/s00216-018-1443-6
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DOI: https://doi.org/10.1007/s00216-018-1443-6