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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
journal contribution
posted on 2018-02-26, 00:00 authored by Tao Zhang, Yiqiang Sun, Lifeng Hang, Huilin Li, Guangqiang Liu, Xiaomin Zhang, Xianjun Lyu, Weiping Cai, Yue LiPeriodic
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 Au–Ag NS array
substrates. Such highly reproducible SERS activity is meaningful for
improving the practical application of portable Raman detection equipment.
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Keywords
dealloying timeRaman detection equipmenttunable composition ratiosPS templatenitric acidmetal deposition-annealingSensitive SERS Performanceoptimized dealloying processSi substratesGood Reproducibilitychemical corrosionlengthligamentATParrayPeriodic Porous AlloyedSERS activityparticle sizealloyed NSsHigh Densitysurface-enhanced Ramanbicontinuous morphology4-optimization experiments
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