Fast temporal response fiber-optic chemical sensors based on the photodeposition of micrometer-scale polymer arrays.
Anal Chem
; 69(11): 2213-6, 1997 Jun 01.
Article
in En
| MEDLINE
| ID: mdl-9183184
ABSTRACT
Fiber-optic chemical sensor microarrays for the detection of pH and O2 have been developed with subsecond response times. Sensor microarrays are fabricated by the covalent immobilization (pH sensor arrays) or the physical entrapment (O2 sensor arrays) of fluorescent indicators in photodeposited polymer matrices on optical imaging fibers. Polymer microarrays are comprised of thousands of individual elements photodeposited as hemispheres such that each element of the sensor array is coupled directly to a discrete optical element of the imaging fiber and is not in contact with other neighboring elements. Because of the hemispherical shape and the individuality of the array elements, diffusion of analyte to the sensor elements is dominated by radial diffusion, resulting in a rapid response time. pH-sensitive arrays based on fluorescein respond to a 1.5-unit pH change within 300 ms, while the O2-sensitive arrays respond to O2 changes within 200 ms (90% of steady state response).
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oxygen
/
Polymers
/
Biosensing Techniques
/
Fiber Optic Technology
Language:
En
Journal:
Anal Chem
Year:
1997
Document type:
Article
Affiliation country:
United States