Journal
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
Volume 39, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colcom.2020.100324
Keywords
Silver nanoparticle-TiO2 nanosheet hybrid; SERS substrates; Photocatalysis; Self-cleaning
Funding
- National Natural Science Foundation of China [81901835, 81671744]
- Science and Technology Project of Xuzhou City [KC17170]
- Scientific Research Foundation for Excellent Talents of Xuzhou Medical University [D2017012]
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Well-ordered TiO2 nanosheets arrays (TiO2 NSAs) are fabricated on the surface of carbon paper (CP) by a hydrothermal method, and Ag nanoparticles (Ag NPs) are in situ deposited at the surface of TiO2 NSAs with an optimized deposition time. The prepared Ag NPs/TiO2 NSAs/CP hybrid are proved to be photocatalysis induced self-cleaning SERS substrates with excellent Raman enhancement activity, uniformity, reusability and renewability. The analytical enhancement factor is 2.52 x 10(8) for 4-mercaptobenzoic acid. Meanwhile, the substrate has excellent spot-to-spot uniformity and long-term stability. In addition, the Ag NPs/TiO2 NSAs/CP hybrid can renew and be reused for several times due to the photocatalysis induced self-cleaning feature. It can be used in analysis of chlorpyrifos with a low limit of detection. This reusable SERS substrate has great promising in applications of detecting toxic chemicals, environmental pollutants, food additives and so on.
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