Substrate surface roughness-dependent 3-D complex nanoarchitectures of gold particles from directed electrodeposition
Substrate surface roughness-dependent 3-D complex nanoarchitectures of gold particles from directed electrodeposition
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DOI：
10.1039/b816835k
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发表时间：
2009-01-01
影响因子：
--
通讯作者：
Choi, Yang-Kyu
中科院分区：
文献类型：
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作者：
Huang, Xing-Jiu;Yarimaga, Oktay;Choi, Yang-Kyu
揭示了基底表面粗糙度对具有刺猬形、菜花形或葡萄串形表面特征的金3-D复合纳米结构的定向电沉积的影响。使用扫描电子显微镜（SEM）观察合成颗粒的表面形貌。它们的化学组成使用X射线衍射（XRD）图案来确认。利用原子力显微镜（AFM）和接触角测量仪对不同粗糙度的ITO/玻璃基板表面进行了检测。沉积电位的变化对Au纳米复合物结构生长的影响为阐明基底表面粗糙度依赖的3-D纳米复合物合成提供了有价值的信息。在相同的实验条件下，采用上述不同的粗糙ITO/玻璃衬底制备了具有不同表面特征的Pt/Au纳米粒子。生长遵循扩散控制机制。电化学实验结果表明，这种刺猬状的Au颗粒表现出增强的伏安响应。这些发现提供了深入了解复杂的微/纳米结构的电合成。有趣的三维纳米结构可以通过控制衬底的表面粗糙度来实现。
The effects of substrate surface roughness on the directed electrodeposition of gold 3-D complex nanoarchitectures with hedgehog-shaped, cauliflower-shaped, or bunch-of-grapes-shaped surface features are revealed. The surface morphology of the synthesized particles was observed using a scanning electron microscope (SEM). Their chemical composition was confirmed using X-ray diffraction (XRD) patterns. The surfaces of ITO/glass substrate with different roughness were checked using atomic force microscopy (AFM) and contact angle measurements. Effects of variation of the deposition potential on the growth of Au nanocomplex structure have provided valuable information to clarify the substrate surface roughness-dependent 3-D nanocomplex synthesis. Pt/Au bimetallic particles with different surface features were produced under the same experimental conditions using mentioned different rough ITO/glass substrates. The growth follows a diffusion controlled mechanism. Electrochemical experimental results demonstrated that such hedgehog-shaped Au particles exhibit enhanced voltammetric responses. These findings offer insight into the electrosynthesis of complex micro/nano-structures. Interesting 3-D nanostructures can be realized by controlling the surface roughness of the substrate.