Two-Photon Lithography of Platinum-Porphyrin Oxygen Sensors

Oxygen sensing structures were generated by two-photon microfabrication. By copolymerizing metalloporphyrins with a two-photon (2P) photo-initiated polymer, oxygen sensors were patterned into complex 3-D shapes. The sensors were generated on the interior walls of small bore capillaries to allow for...

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Bibliographic Details
Published in:IEEE sensors journal 2007-06, Vol.7 (6), p.931-936
Main Authors: Young, A.C., Dragavon, J., Strovas, T., Molter, T., Lixin Zheng, Burgess, L., Jen, A.K.-Y., Lidstrom, M.E., Meldrum, D.R.
Format: Article
Language:English
Subjects:
Bacteria
Biosensors
Boring
Capillary sensors
Chemical and biological sensors
Chemistry
Lithography
microfabrication
Monomers
Optical sensors
Oxygen
oxygen detection
Platinum
Polymerization
Polymers
Sensors
Shape
Solids
Thresholds
two-photon (2P)
Walls
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Summary:Oxygen sensing structures were generated by two-photon microfabrication. By copolymerizing metalloporphyrins with a two-photon (2P) photo-initiated polymer, oxygen sensors were patterned into complex 3-D shapes. The sensors were generated on the interior walls of small bore capillaries to allow for controlled concentrations of oxygenated water and cell-rich media to be pumped through their local environment. Phosphorescence lifetime of the patterns were acquired at known levels of O 2 as a standard for measuring the respiration rate of a tiny population of bacterial cells. In addition, we report that the inclusion of the Pt-Porphyrin significantly reduces the 2P polymerization threshold. Fabricating near the inferred polymerization threshold, 3-D structures as small as 50 nm were observed in both the Pt-Porphyrin enhanced and the pure photopolymerizable monomers
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2007.896537