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Design, fabrication and characterization of monolithic embedded parylene microchannels in silicon substrate

Chen, Po-Jui and Shih, Chi-Yuan and Tai, Yu-Chong (2006) Design, fabrication and characterization of monolithic embedded parylene microchannels in silicon substrate. Lab on a Chip, 6 (6). pp. 803-810. ISSN 1473-0197. https://resolver.caltech.edu/CaltechAUTHORS:CHEloac06

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Abstract

This paper presents a novel channel fabrication technology of bulk-micromachined monolithic embedded polymer channels in silicon substrate. The fabrication process favorably obviates the need for sacrifical materials in surface-micromachined channels and wafer-bonding in conventional bulk-micromachined channels. Single-layer-deposited parylene C (poly-para-xylylene C) is selected as a structural material in the microfabricated channels/columns to conduct life science research. High pressure capacity can be obtained in these channels by the assistance of silicon substrate support to meet the needs of high-pressure loading conditions in microfluidic applications. The fabrication technology is completely compatible with further lithographic CMOS/MEMS processes, which enables the fabricated embedded structures to be totally integrated with on-chip micro/nano-sensors/actuators/structures for miniaturized lab-on-a-chip systems. An exemplary process was described to show the feasibility of combining bulk micromachining and surface micromachining techniques in process integration. Embedded channels in versatile cross-section profile designs have been fabricated and characterized to demonstrate their capabilities for various applications. A quasi-hemi-circular-shaped embedded parylene channel has been fabricated and verified to withstand inner pressure loadings higher than 1000 psi without failure for micro-high performance liquid chromatography (µHPLC) analysis. Fabrication of a high-aspect-ratio (internal channel height/internal channel width, greater than 20) quasi-rectangular-shaped embedded parylene channel has also been presented and characterized. Its implementation in a single-mask spiral parylene column longer than 1.1 m in a 3.3 mm × 3.3 mm square size on a chip has been demonstrated for prospective micro-gas chromatography (µGC) and high-density, high-efficiency separations. This proposed monolithic embedded channel technology can be extensively implemented to fabricate microchannels/columns in high-pressure microfludics and high-performance/high-throughput chip-based micro total analysis systems (µTAS).


Item Type:Article
ORCID:
AuthorORCID
Tai, Yu-Chong0000-0001-8529-106X
Additional Information:© Royal Society of Chemistry 2006. Received 9th January 2006, Accepted 21st March 2006. First published as an Advance Article on the web 30th March 2006. Electronic supplementary information (ESI) available: Colour figures. See DOI: 10.1039/b600224b This work was supported in part by the Engineering Research Centers Program of the National Science Foundation under NSF Award Number EEC-0310723 and EEC-9402726. The authors would like to especially thank Mr Damien Rodger for his valuable comments as well as Mr Trevor Roper for his fabrication assistance.
Funders:
Funding AgencyGrant Number
NSFEEC-0310723
NSFEEC-9402726
Issue or Number:6
Record Number:CaltechAUTHORS:CHEloac06
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:CHEloac06
Alternative URL:http://dx.doi.org/10.1039/b600224b
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4128
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:28 Jul 2006
Last Modified:02 Oct 2019 23:10

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