In this paper, we present our results from process
development and characterization of optical oxygen sensors that are patterned
by traditional UV lithography.
An oxygen sensitive luminescent probe, platinum
octaethylporphyrin, was encapsulated in commercially purchased photoresist
(AZ5214) to form uniform thin sensor films on fused silica substrates.
Plasticizer ethoxylated trimethylolpropane triacrylate (SR454) was added to the
dye-photoresist sensor mixtures to improve the oxygen sensitivity.
The optimum sensor mixture composition that can be patterned
with maximum sensitivity was identified. The microfabrication process
conditions, cell adherence and oxygen sensitivity results from patterned
structures were characterized in detail. Down to 3 μm features have been
fabricated on fused silica substrates using the developed techniques.
The result implies that the developed methods can provide a
feasible way to miniaturize the optical sensor system for single cell analysis
with precise control of sensor volume and response.
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