Nanocrystalline ZnO Film Layer on Silicon and its Application to Surface Acoustic Wave-Based Streaming

Lee, Dae-Sik, Luo, Jikui, Fu, Yong Qing, Milne, William, Park, Nae-Man, Kim, Sang Hyeob, Jung, Mun Yeon and Maeng, Sunglyul (2008) Nanocrystalline ZnO Film Layer on Silicon and its Application to Surface Acoustic Wave-Based Streaming. Journal of Nanoscience and Nanotechnology, 8 (9). pp. 4626-4629. ISSN 1533 4880

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Official URL: http://dx.doi.org/10.1166/jnn.2008.IC44

Abstract

A surface acoustic wave (SAW) device consisting of 1∼6 m-thick ZnO thin films deposited on Si wafer was designed, fabricated, and characterized in this study. Photolithographic protocols for interdigitated transducers (IDTs) and surface modification using fluoroalkylsilane are employed with the aim of droplet-based microfluidic actuations in bio-microsystems. A ZnO thin film was grown on a 4′ silicon wafer with c-axis orientation, an average roughness of 11.6 nm, and a small grain size of 20 nm. It was found that the resonant frequencies (Rayleigh and Sezawa modes) of SAW devices move to a lower frequency range as the thickness of the ZnO thin films increases. Through the silane surface modification, a hydrophobic surface with a contact angle of 114° was obtained. Finally, liquid streaming by acoustic wave was demonstrated by observing the actuation of SiO2 microparticles in a microfluidic drop.

Item Type: Article
Uncontrolled Keywords: Droplet, microfluidic mixing, nanocrystalline, surface acoustic wave, ZNO film
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 27 Mar 2015 10:45
Last Modified: 10 Aug 2015 11:29
URI: http://nrl.northumbria.ac.uk/id/eprint/21886

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