Facile method for decorations of Au nanoparticles on TiO2 nanorod arrays toward high-performance recyclable SERS substrates

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Author list: Samransuksamer B., Horprathum M., Jutarosaga T., Kopwitthaya A., Limwichean S., Nuntawong N., Chananonnawathorn C., Patthanasettakul V., Muthitamongkol P., Treetong A., Klamchuen A., Leelapojanaporn A., Thanachayanont C., Eiamchai P.

Publisher: Elsevier

Publication year: 2018

Journal: Sensors and Actuators B: Chemical (0925-4005)

Volume number: 277

Start page: 102

End page: 113

Number of pages: 12

ISSN: 0925-4005

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052910888&doi=10.1016%2fj.snb.2018.08.136&partnerID=40&md5=4b128f935b9ab98be475839764fa5ea5

Languages: English-Great Britain (EN-GB)

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Abstract

High-performance recyclable SERS substrates with well-ordered hybrid nanostructure gold nanoparticles (Au NPs) decorated on titanium dioxide nanorods (TiO2 NRs) were successfully prepared by combining two methods. The TiO2 NRs were fabricated by electron-beam evaporation with glancing-angle deposition (GLAD) technique, then the Au NPs were decorated onto the TiO2 NRs surfaces by deposition-precipitation (DP). The physical structures of the obtained hybrid nanostructures were characterized by field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscope (TEM), and grazing incident angle X-ray diffraction (GIXRD). The results indicated that size and density of Au NPs on TiO2 NRs were controlled by HAuCl4 concentration for optimization of the SERS performance whose the detection of MB molecules was achieved at an enhancement factor of 6.5 × 107 with 9.76%-RSD at 1626 cm−1. More significantly, the optimized hybrid nanostructure SERS substrates exhibit excellent recyclability. These hybrid nanostructure SERS substrates were therefore promising towards detection of TNT for homeland security applications, as well as an on-site SERS platform. © 2018 Elsevier B.V.

Keywords

Au nanoparticles, Deposition-precipitation, TiO2 nanorods