Open Access Nano Express

OPAA template-directed synthesis and optical properties of metal nanocrystals

Xiu-chun Yang1*, Jun-wei Hou12, Yan Liu1, Miao-miao Cui1 and Wei Lu1

Author affiliations

1 Department of Materials Science and Engineering, Tongji University, Shanghai, 201804, China

2 Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, China

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Citation and License

Nanoscale Research Letters 2013, 8:328  doi:10.1186/1556-276X-8-328

Published: 18 July 2013

Abstract

Ag and Cu nanocrystals (NCs) were assembled into ordered porous anodic alumina (OPAA) by a single-potential-step chronoamperometry technique. The composition, morphology, microstructure, and optical property were analyzed by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, and optical absorption spectroscopy. The results indicate that metallic NCs/OPAA composite possesses a significant surface plasmon resonance absorption. For continuous electrodeposition, metallic nanowires are smooth and uniform with face-centered cubic (fcc) single-crystalline structure; however, for interval electrodeposition, the nanowires are bamboo-like or pearl-chain-like with fcc polycrystalline structure. The length of the nanoparticle nanowires or the single-crystalline nanowires can be controlled well by adjusting the experimental cycle times or the continuous depositing time. The transverse dipole resonance of metallic NCs enhances and displays a blue shift with increasing electrodeposition time or experimental cycle times, which is consistent with Zong's results but contradictory to Duan's results. The formation mechanisms of the nanoparticle nanowires and the single-crystalline nanowires were discussed in detail.

Keywords:
Nanostructures; Chemical synthesis; Electron microscopy; Optical properties