On-chip coupling of electrochemical pumps and an SU-8 tip for electrospray ionization mass spectrometry.
We present the integration of a cyclo olefin copolymer microfluidic chip with electrochemical pumps and an SU-8 tip for electrospray ionization mass spectrometry. The electrochemical pump, using electrolysis as an internal pressure source, was fabricated directly on the surface of the polymer chip. The triangular SU-8 emitter tip was fabricated on a glass wafer using standard photolithography. After release from the glass wafer, this tip was aligned to the microchannel and bonded between two polymer plates. The electrochemical pump and the electrospray tip were tested with electrospray ionization mass spectrometry. Mass spectrometry confirmed the stability of the electrochemical pump and the electrospray tip.
School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA.
Seung-Min
SM
Park
Department of Chemical Engineering, University of Delaware, Newark, NJ, 19716, USA.
Kelvin H
KH
Lee
School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA. hgc1@cornell.edu.
Harold G
HG
Craighead
D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D046210:Microfluidic Analytical Techniques; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation* / Q000379:methods