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Silver Nano-Dendrite-Plated Porous Silicon Substrates Formed by Single-Step Electrochemical Synthesis for Surface-Enhanced Raman Scattering
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-02-12 , DOI: 10.1021/acsanm.0c00296 Daohan Ge 1, 2 , Jinxiu Wei 1 , Jie Ding 1 , Jin Zhang 3 , Chao Ma 1 , Minchang Wang 1 , Liqiang Zhang 1, 4 , Shining Zhu 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-02-12 , DOI: 10.1021/acsanm.0c00296 Daohan Ge 1, 2 , Jinxiu Wei 1 , Jie Ding 1 , Jin Zhang 3 , Chao Ma 1 , Minchang Wang 1 , Liqiang Zhang 1, 4 , Shining Zhu 2
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Nanostructured layers composed of porous silicon (PSi)-based silver (Ag) nanodendrites have been formed by a simple single-step electrochemical anodic oxidation process on p-type silicon substrate. A mixture of hydrofluoric acid (HF), silver nitrate (AgNO3), and dimethylformamide (DMF) solution was used as the electrolyte to form PSi and nanoscaled Ag structures simultaneously in a few minutes without any post treatment. We studied the influence of the anodization parameters on the morphologies of Ag-PSi structures. The results show that the metallic Ag attached to PSi surfaces completed the conversion from nanoparticles to nanodendrites with the increase of AgNO3 concentrations, along with the increase of the number, size, and the area they covered of dendrites. The sensitivity and stability of the Ag dendrites-coated PSi substrate were evaluated using Rhodamine 6G (R6G) as probe molecule. This Ag-PSi substrate exhibits high surface-enhanced Raman scattering (SERS) response, good reproducibility, and outstanding long-time stability with a detection limit of R6G as low as 10–11 M. This single-step systhesis technique provides a simple method for preparation of SERS-active substrates with high sensitivity and stability, representing a promising SERS platform for chemical and biomolecule detections.
中文翻译：
单步电化学合成形成的表面增强拉曼散射的银纳米树枝状镀多孔硅基底
通过简单的单步电化学阳极氧化工艺，在p型硅衬底上形成了由多孔硅（PSi）基银（Ag）纳米树枝晶组成的纳米结构层。氢氟酸（HF），硝酸银（AgNO 3）和二甲基甲酰胺（DMF）溶液的混合物用作电解质，可在几分钟内同时形成PSi和纳米级Ag结构，而无需任何后处理。我们研究了阳极氧化参数对Ag-PSi结构形态的影响。结果表明，随着AgNO 3含量的增加，附着在PSi表面的金属Ag完成了从纳米粒子到纳米枝晶的转变。浓度，以及树突的数量，大小和覆盖面积的增加。以罗丹明6G（R6G）为探针分子评估了Ag树枝状覆膜的PSi基板的灵敏度和稳定性。这种Ag-PSi底物表现出高的表面增强拉曼散射（SERS）响应，良好的重现性和出色的长期稳定性，R6G的检出限低至10 –11M。这种单步合成技术提供了一种简单的方法用于制备具有高灵敏度和稳定性的SERS活性底物，代表了用于化学和生物分子检测的有前途的SERS平台。
更新日期：2020-02-12
中文翻译：
单步电化学合成形成的表面增强拉曼散射的银纳米树枝状镀多孔硅基底
通过简单的单步电化学阳极氧化工艺，在p型硅衬底上形成了由多孔硅（PSi）基银（Ag）纳米树枝晶组成的纳米结构层。氢氟酸（HF），硝酸银（AgNO 3）和二甲基甲酰胺（DMF）溶液的混合物用作电解质，可在几分钟内同时形成PSi和纳米级Ag结构，而无需任何后处理。我们研究了阳极氧化参数对Ag-PSi结构形态的影响。结果表明，随着AgNO 3含量的增加，附着在PSi表面的金属Ag完成了从纳米粒子到纳米枝晶的转变。浓度，以及树突的数量，大小和覆盖面积的增加。以罗丹明6G（R6G）为探针分子评估了Ag树枝状覆膜的PSi基板的灵敏度和稳定性。这种Ag-PSi底物表现出高的表面增强拉曼散射（SERS）响应，良好的重现性和出色的长期稳定性，R6G的检出限低至10 –11M。这种单步合成技术提供了一种简单的方法用于制备具有高灵敏度和稳定性的SERS活性底物，代表了用于化学和生物分子检测的有前途的SERS平台。
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