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Tunable Nanowire Patterning Using Standing Surface Acoustic Waves

2013; American Chemical Society; Volume: 7; Issue: 4 Linguagem: Inglês

10.1021/nn4000034

1936-086X

Yuchao Chen, Xiaoyun Ding, Sz-Chin Steven Lin, Shikuan Yang, Po‐Hsun Huang, Nitesh Nama, Yanhui Zhao, Ahmad Nawaz, Feng Guo, Wei Wang, Yeyi Gu, Thomas E. Mallouk, Tony Jun Huang,

Nanofabrication and Lithography Techniques

Patterning of nanowires in a controllable, tunable manner is important for the fabrication of functional nanodevices. Here we present a simple approach for tunable nanowire patterning using standing surface acoustic waves (SSAW). This technique allows for the construction of large-scale nanowire arrays with well-controlled patterning geometry and spacing within 5 s. In this approach, SSAWs were generated by interdigital transducers, which induced a periodic alternating current (ac) electric field on the piezoelectric substrate and consequently patterned metallic nanowires in suspension. The patterns could be deposited onto the substrate after the liquid evaporated. By controlling the distribution of the SSAW field, metallic nanowires were assembled into different patterns including parallel and perpendicular arrays. The spacing of the nanowire arrays could be tuned by controlling the frequency of the surface acoustic waves. Additionally, we observed 3D spark-shaped nanowire patterns in the SSAW field. The SSAW-based nanowire-patterning technique presented here possesses several advantages over alternative patterning approaches, including high versatility, tunability, and efficiency, making it promising for device applications.