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

ACS Applied Materials & Interfaces
Tao ZhangYue Li

Abstract

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 (∼cm2) 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 10-10 M 4-ATP could be detected on these porous A...Continue Reading

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Citations

Feb 6, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ning MaYoung Mee Jung
Mar 15, 2019·Nanoscale Research Letters·Li TangXiaoshan Liu
Aug 23, 2019·Nanotechnology·Tingting GeYingzhou Huang
Aug 7, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Lucio LittiLuis M Liz-Marzán
Dec 2, 2020·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Qi ChuYoung Mee Jung
Feb 5, 2019·ACS Applied Materials & Interfaces·Myeong Geun ChaDae Hong Jeong
Feb 20, 2020·ACS Sensors·Xiaotong GuoLingxin Chen

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