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Periodic Porous Alloyed Au–Ag Nanosphere Arrays and Their Highly Sensitive SERS Performance with Good Reproducibility and High Density of Hotspots

By Tao Zhang (43681), Yiqiang Sun (1938001), Lifeng Hang (4426780), Huilin Li (795365), Guangqiang Liu (1787232), Xiaomin Zhang (136250), Xianjun Lyu (4915237), Weiping Cai (299830) and Yue Li (102191)


Periodic porous alloyed Au–Ag nanosphere (NS) arrays with different periodic lengths and tunable composition ratios were prepared on Si substrates on a large scale (∼cm<sup>2</sup>) using stepwise metal deposition-annealing and subsequent chemical corrosion from a monolayer of colloidal polystyrene (PS) microspheres as the initial template. The porous alloyed Au–Ag NSs possessed a high porosity and bicontinuous morphology composed of hierarchically interconnected ligaments, which were obtained from an optimized dealloying process in nitric acid. Interestingly, when the dealloying time was prolonged, the average size of the porous alloyed NSs slightly decreased, and the width of the ligaments gradually increased. The periodic length of the array could be facilely changed by controlling the initial particle size of the PS template. Moreover, the porous alloyed Au–Ag NS arrays were explored as a platform for the surface-enhanced Raman scattering (SERS) detection of 4-aminothiophenol (4-ATP) and exhibited excellent reproducibility and high sensitivity because of the periodic structure of the arrays and the abundance of inherent “hotspots”. After optimization experiments, a low concentration of 10<sup>–10</sup> M 4-ATP could be detected on these porous Au–Ag NS array substrates. Such highly reproducible SERS activity is meaningful for improving the practical application of portable Raman detection equipment

Topics: Biochemistry, Cell Biology, Neuroscience, Biotechnology, Ecology, Computational Biology, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, dealloying time, Raman detection equipment, tunable composition ratios, PS template, nitric acid, metal deposition-annealing, Sensitive SERS Performance, optimized dealloying process, Si substrates, Good Reproducibility, chemical corrosion, length, ligament, ATP, array, Periodic Porous Alloyed, SERS activity, particle size, alloyed NSs, High Density, surface-enhanced Raman, bicontinuous morphology, 4-, optimization experiments
Year: 2018
DOI identifier: 10.1021/acsami.7b17461.s001
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Provided by: FigShare
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