Etching technology for chromatography microchannels

Tjerkstra, R.W. and Boer de, M. and Berenschot, E. and Gardeniers, J.G.E. and Berg van den, A. and Elwenspoek, M.C. (1997) Etching technology for chromatography microchannels. Electrochimica Acta, 42 (20-22). pp. 3399-3406. ISSN 0013-4686

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Abstract:	Half-circular channels, to be used for gas chromatography, were etched isotropically using a mixture of HF, HNO3 and H2O. Two wafers with half-circular channels were bonded on top of each other to yield channels with a circular cross-section. During etching the so-called "loading effect" was encountered: the etch rate depends on the local structure density. To solve this, extra structures were placed around the channels to create an equal structure density over the wafer and so prevent irregularities in channel width. To eliminate the alignment problems that arise when bonding two wafers with isotropically etched channels together, a method which combines deep trench etching, passivation and isotropic etching was developed to construct channels under the surface of a wafer.
Item Type:	Article
Copyright:	© 1997 Published by Elsevier Science Ltd.
Faculty:	Science and Technology (TNW) Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Mesoscale Chemical Systems (MCS) Biomedical and Environmental Sensor systems (BIOS) Transducers Science and Technology (TST)
Link to this item:	http://purl.utwente.nl/publications/14245
Official URL:	http://dx.doi.org/10.1016/S0013-4686(97)00193-X
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