Fabrication of dendrite-like Au nanostructures and their enhanced photoluminescence emission

✍ Scribed by Hu, Ying ;Pan, Nan ;Zhang, Kun ;Wang, Zhenxing ;Hu, Hailong ;Wang, Xiaoping

• Book ID: 105364411
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 564 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200723022

✦ Synopsis

Abstract

Special hierarchical dendrite‐like Au (DLAu) nanostructures were fabricated facilely between the gaps of Au electrodes by an electrochemical method. The composition, morphology and crystallinity of the DLAu nanostructures were characterized using energy dispersive spectroscopy, field emission scanning electron microscopy and X‐ray diffraction, respectively. The formation of these nanostructures is attributed to the distribution of the local electrical field between the Au electrodes and a diffusion‐limited aggregation process. Photoluminescence (PL) having an emission peak near 530 nm is observed from these nanostructures, which is attributed to the recombination of the s–p band electrons near the Fermi energy with the d band holes in the DLAu nanostructures generated by optical excitation. We believe that such PL enhancement compared to a smooth Au film is due to the local‐field enhancement from the surface plasmon resonance of the DLAu nanostructures. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)