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Effect of electrolyte pH value and current density on the electrodeposition of silver nanoparticles into porous silicon
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2020-11-01 , DOI: 10.1117/1.jnp.14.040501
Rehab Ramadan 1 , Raúl J. Martín-Palma 1
Affiliation  

Nanostructured porous silicon (PS) can be used as a template for the growth of noble metal nanoparticles for the subsequent development of metal/semiconductor hybrid structures with application in several fields. The current work reports on the electrodeposition of silver nanoparticles (AgNPs) into columnar PS layers. In particular, the size, morphology, and surface density of the AgNPs grown into PS were studied as a function of the electrolyte pH value and the infiltration current density. Furthermore, the optical properties of the hybrid PS + AgNPs structures were analyzed. The experimental results show a remarkable reduction in the size of AgNPs and increased growth rate upon reducing the acidity of the electrolyte and upon increasing the current density. In addition, a remarkable reduction of the average reflectance is observed under specific fabrication conditions. In particular, as the pH values of the electrolyte increase, the optical reflectance decreases. This relation is attributed to the reduction in the AgNPs size. On the other hand, increasing the infiltration current density increases the average reflectance due to increasing surface density of the AgNPs. These results demonstrate that the size and shape of AgNPs can be controlled by adjusting the applied infiltration current density and the pH value of the electrolyte depending on the intended application.

中文翻译:

电解质pH值和电流密度对纳米银电沉积到多孔硅中的影响

纳米结构多孔硅(PS)可以用作贵金属纳米颗粒生长的模板,用于随后在多个领域中应用的金属/半导体混合结构的开发。当前的工作报道了银纳米颗粒(AgNPs)在柱状PS层中的电沉积。特别地,研究了生长到PS中的AgNPs的尺寸,形态和表面密度与电解质pH值和渗透电流密度的关系。此外,分析了PS + AgNPs杂化结构的光学性质。实验结果表明,在降低电解质的酸度和增加电流密度后,AgNPs的尺寸显着减小,并且生长速率提高。此外,在特定的制造条件下,平均反射率明显降低。特别地,随着电解质的pH值增加,光反射率降低。这种关系归因于AgNPs尺寸的减小。另一方面,由于AgNPs的表面密度增加,增加渗透电流密度增加了平均反射率。这些结果表明,取决于预期的应用,可以通过调节施加的渗透电流密度和电解质的pH值来控制AgNPs的大小和形状。由于AgNPs的表面密度增加,增加渗透电流密度会增加平均反射率。这些结果表明,取决于预期的应用,可以通过调节施加的渗透电流密度和电解质的pH值来控制AgNPs的大小和形状。由于AgNPs的表面密度增加,增加渗透电流密度会增加平均反射率。这些结果表明,取决于预期的应用,可以通过调节施加的渗透电流密度和电解质的pH值来控制AgNPs的大小和形状。
更新日期:2020-11-04
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