A new masking technology for deep glass etching and its microfluidic application

Bu, Minqiang, Melvin, Tracy, Ensell, Graham J., Wilkinson, James S. and Evans, Alan G.R. (2004) A new masking technology for deep glass etching and its microfluidic application Sensors and Actuators A: Physical, 115, (2-3), pp. 476-482. (doi:10.1016/j.sna.2003.12.013).


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A new masking technology for wet etching of glass, to a depth of more than 300µm, is reported. Various mask materials, which can be patterned by standard photolithography and metal etching processes, were investigated for glass etching in concentrated hydrofluoric acid (HF). A multilayer of metal, Cr/Au/Cr/Au, in combination with thick SPR220-7 photoresist, was found to be ideal for this purpose. Through holes etched from both sides of a 500µm thick Pyrex glass wafer were obtained.
Pinholes, created in the glass by failure of simple metal masking when subjected to HF etching, were successfully eliminated using the new masking technology. In addition, the lateral undercutting of glass caused by the under-etching of the Cr mask was minimized to 27% of the etching depth. With these advantages, this newly developed masking method was successfully applied to fabricate microfluidic components for a micro-peristaltic pump to be integrated in a micro polymerase chain reaction (PCR) device. These components include through holes for liquid accessing and electrical contacting and a 200µm thick pump diaphragm. This new masking technology also adds to the methods available to fabricate the microfluidic devices in glass substrates.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.sna.2003.12.013
ISSNs: 0924-4247 (print)
Related URLs:
Keywords: deep glass etching, masking technology, pcr device, micro peristaltic pump
ePrint ID: 30220
Date :
Date Event
Date Deposited: 11 May 2006
Last Modified: 16 Apr 2017 22:19
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/30220

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