TY - JOUR
T1 - Design and fabrication of a novel microfluidic nanoprobe
AU - Moldovan, Nicolaie
AU - Kim, Keun Ho
AU - Espinosa, Horacio D.
N1 - Funding Information:
Manuscript received February 15, 2005; revised July 29, 2005. This work was supported by the Nanoscale Science and Engineering Initiative of the National Science Foundation under NSF Award Number EEC-0118025. Subject Editor D. Cho. The authors are with the Mechanical Engineering, Northwestern University, Evanston, IL 60208 USA (e-mail: espinosa@northwestern.edu). Digital Object Identifier 10.1109/JMEMS.2005.863701
PY - 2006/2
Y1 - 2006/2
N2 - The design and fabrication of a novel microfluidic nanoprobe system are presented. The nanoprobe consists of cantilevered ultrasharp volcano-like tips, with microfluidic capabilities consisting of microchannels connected to an on-chip reservoir. The chip possesses additional connection capabilities to a remote reservoir. The fabrication uses standard surface micromachining techniques and materials. Bulk micromachining is employed for chip release. The microchannels are fabricated in silicon nitride by a new methodology, based on edge underetching of a sacrificial layer, bird's beak oxidation for mechanically closing the edges, and deposition of a sealing layer. The design and integration of various elements of the system and their fabrication are discussed. The system is conceived mainly to work as a "nanofountain pen", i.e., a continuously writing upgrade of the dip-pen nanolithography approach. Moreover, the new chip shows a much larger applicability area in fields such as electrochemical nanoprobes, nanoprobe-based etching, build-up tools for nanofabrication, or a probe for materials interactive analysis. Preliminary tests for writing and imaging with the new device were performed. These tests illustrate the capabilities of the new device and demonstrate possible directions for improvement.
AB - The design and fabrication of a novel microfluidic nanoprobe system are presented. The nanoprobe consists of cantilevered ultrasharp volcano-like tips, with microfluidic capabilities consisting of microchannels connected to an on-chip reservoir. The chip possesses additional connection capabilities to a remote reservoir. The fabrication uses standard surface micromachining techniques and materials. Bulk micromachining is employed for chip release. The microchannels are fabricated in silicon nitride by a new methodology, based on edge underetching of a sacrificial layer, bird's beak oxidation for mechanically closing the edges, and deposition of a sealing layer. The design and integration of various elements of the system and their fabrication are discussed. The system is conceived mainly to work as a "nanofountain pen", i.e., a continuously writing upgrade of the dip-pen nanolithography approach. Moreover, the new chip shows a much larger applicability area in fields such as electrochemical nanoprobes, nanoprobe-based etching, build-up tools for nanofabrication, or a probe for materials interactive analysis. Preliminary tests for writing and imaging with the new device were performed. These tests illustrate the capabilities of the new device and demonstrate possible directions for improvement.
KW - Dip-pen nanolithography
KW - Microfluidics
KW - Micropipette
KW - Nanoprobe
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U2 - 10.1109/JMEMS.2005.863701
DO - 10.1109/JMEMS.2005.863701
M3 - Article
AN - SCOPUS:32244435024
SN - 1057-7157
VL - 15
SP - 204
EP - 213
JO - Journal of Microelectromechanical Systems
JF - Journal of Microelectromechanical Systems
IS - 1
ER -