Use of Microhotplates in the Controlled Growth and Characterization of Metal Oxides for Chemical Sensing

Published

December 1, 2003

Author(s)

Richard E. Cavicchi, Stephen Semancik, F DiMeo, C J. Taylor

Abstract

Microhotplates are micromachined platforms with integrated heaters and contact electrodes that can be used as miniature substrates for metal oxide film growth. Fabricated as arrays, they enable efficient combinatorial studies to be performed on a single chip. A variety of growth methods are compatible with their use, including evaporation, sputtering, chemical vapor deposition, and deposition from pastes or sol gels using screen printing, drop deposition, or spin-coating. The microheater on each element may be used to control the temperature during deposition or for a post-annealing step such as sintering, while the built-in film contact electrodes allow real-time monitoring of the deposition process. In chemical vapor deposition using arrays, the elements with heaters set above the lowest nucleation temperature for a given precursor are the only ones that will have film deposited on them, resulting in a self-lithographic process. This review gives examples of different methods of film growth that have been employed on microhotplates with applications for chemical sensing, with an emphasis on chemical vapor deposition.

Citation

Journal of Electroceramics

Volume

9

Issue

No. 3

Pub Type

Journals

Download Paper

https://doi.org/10.1023/A:1023224123925

Keywords

chemical vapor deposition, gas sensor, membrane, microhotplate, micromachined, tin oxide

Citation

Cavicchi, R. , Semancik, S. , DiMeo, F. and Taylor, C. (2003), Use of Microhotplates in the Controlled Growth and Characterization of Metal Oxides for Chemical Sensing, Journal of Electroceramics, [online], https://doi.org/10.1023/A:1023224123925 (Accessed December 16, 2024)