Department of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
Nanoscale Res Lett. 2013 Jul 18;8(1):328. doi: 10.1186/1556-276X-8-328.
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.
银和铜纳米晶体（NCs）通过单电位阶跃计时安培法被组装到有序多孔阳极氧化铝（OPAA）中。通过 X 射线衍射、场发射扫描电子显微镜、透射电子显微镜、选区电子衍射和光吸收光谱分析了其组成、形态、微观结构和光学性质。结果表明，金属 NCs/OPAA 复合材料具有显著的表面等离子体共振吸收。对于连续电沉积，金属纳米线光滑且均匀，具有面心立方（fcc）单晶结构；然而，对于间隔电沉积，纳米线呈竹节状或珍珠链状，具有 fcc 多晶结构。通过调整实验循环次数或连续沉积时间，可以很好地控制纳米颗粒纳米线或单晶纳米线的长度。金属 NCs 的横向偶极共振增强并随着电沉积时间或实验循环次数的增加而发生蓝移，这与宗的结果一致，但与段的结果相反。详细讨论了纳米颗粒纳米线和单晶纳米线的形成机制。
