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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
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-02-26 00:00:00 , DOI: 10.1021/acsami.7b17461
Tao Zhang 1, 2 , Yiqiang Sun 1, 2 , Lifeng Hang 1 , Huilin Li 1, 2 , Guangqiang Liu 1 , Xiaomin Zhang 3 , Xianjun Lyu 4 , Weiping Cai 1 , Yue Li 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-02-26 00:00:00 , DOI: 10.1021/acsami.7b17461
Tao Zhang 1, 2 , Yiqiang Sun 1, 2 , Lifeng Hang 1 , Huilin Li 1, 2 , Guangqiang Liu 1 , Xiaomin Zhang 3 , Xianjun Lyu 4 , Weiping Cai 1 , Yue Li 1
Affiliation
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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 Au–Ag NS array substrates. Such highly reproducible SERS activity is meaningful for improving the practical application of portable Raman detection equipment.
中文翻译:
周期性多孔合金化Au-Ag纳米球阵列及其高灵敏度SERS性能,良好的重现性和高密度的热点
在硅衬底上大规模制备了具有不同周期长度和可调组成比的周期性多孔合金化Au-Ag纳米球(NS)阵列(〜cm 2),使用逐步的金属沉积退火和随后的单层胶态聚苯乙烯(PS)微球化学腐蚀作为初始模板。多孔合金化的Au-Ag NSs具有高孔隙率和双连续形态,由分层互连的韧带组成,这是通过在硝酸中优化脱合金工艺获得的。有趣的是,当延长脱合金时间时,多孔合金化NS的平均尺寸略有减小,而韧带的宽度逐渐增大。通过控制PS模板的初始粒径,可以方便地更改阵列的周期长度。而且,多孔合金化的Au-Ag NS阵列被用作表面增强拉曼散射(SERS)检测4-氨基硫酚(4-ATP)的平台,并且由于阵列的周期性结构和高灵敏度而具有出色的重现性和高灵敏度。大量固有的“热点”。经过优化实验后,低浓度的10在这些多孔的Au-Ag NS阵列基板上可以检测到–10 M 4-ATP。这种高度可重现的SERS活性对于提高便携式拉曼检测设备的实际应用意义重大。
更新日期:2018-02-26
中文翻译:
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周期性多孔合金化Au-Ag纳米球阵列及其高灵敏度SERS性能,良好的重现性和高密度的热点
在硅衬底上大规模制备了具有不同周期长度和可调组成比的周期性多孔合金化Au-Ag纳米球(NS)阵列(〜cm 2),使用逐步的金属沉积退火和随后的单层胶态聚苯乙烯(PS)微球化学腐蚀作为初始模板。多孔合金化的Au-Ag NSs具有高孔隙率和双连续形态,由分层互连的韧带组成,这是通过在硝酸中优化脱合金工艺获得的。有趣的是,当延长脱合金时间时,多孔合金化NS的平均尺寸略有减小,而韧带的宽度逐渐增大。通过控制PS模板的初始粒径,可以方便地更改阵列的周期长度。而且,多孔合金化的Au-Ag NS阵列被用作表面增强拉曼散射(SERS)检测4-氨基硫酚(4-ATP)的平台,并且由于阵列的周期性结构和高灵敏度而具有出色的重现性和高灵敏度。大量固有的“热点”。经过优化实验后,低浓度的10在这些多孔的Au-Ag NS阵列基板上可以检测到–10 M 4-ATP。这种高度可重现的SERS活性对于提高便携式拉曼检测设备的实际应用意义重大。