Advances in piezoelectric thin films for acoustic biosensors, acoustofluidics and lab-on-chip applications

Y.Q. Fu, J.K. Luo, N.T. Nguyen, Anthony Walton, A. J. Flewitt, Yifan Li, Hejun Du, X.T. Zhou, Glen McHale, E. Iborra, A. Mathews, W.I. Milne

Research output: Contribution to journalArticlepeer-review

Abstract

Recently piezoelectric thin films including zinc oxide (ZnO) and aluminium nitride (AlN) have found a broad range of lab-on-chip applications such as biosensing, particle/cell concentrating and sorting, patterning, pumping, mixing, nebulization and jetting. Integrated acoustic wave sensing/microfluidic devices have been fabricated by depositing these piezoelectric films onto a number of substrates such as silicon, ceramics, diamond, quartz, glass, and more recently also polymer, metallic foils and bendable glass/silicon for making flexible devices. Such thin-film acoustic wave devices have a great potential for various sensing and actuating applications, allowing for the implementation of integrated, disposable, or bendable/flexible lab-on-a-chip devices. This paper discusses the recent development in engineering high performance piezoelectric thin films, and highlights the critical issues such as film deposition, MEMS processing techniques, control of deposition/processing parameters, film texture, doping, dispersion effects, film stress, multilayer design, electrode materials/designs and substrate selections. Finally, advances in using thin film devices for lab-on-chip applications are summarised and future development trends identified.
Original languageEnglish
Pages (from-to)31-91
Number of pages61
JournalProgress in Materials Science
Volume89
Early online date24 Apr 2017
DOIs
Publication statusE-pub ahead of print - 24 Apr 2017

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