Chemically-selective Sensor Film Characterization
EMSL Project ID
11396
Abstract
A new film material comprised of quaternized poly(4-vinylpyridine) cross-linked with 1,10-diiododecane (herein QPVP) has been developed for possible use in the spectroelectrochemical sensor for pertechnetate at the Hanford Site. The QPVP films have recently been used at PNNL to repeat cyclic voltammetry experiments with pertechnetate (TcO4-) as previously performed with other candidate films in the RPL. Our results showed that cross-linked quaternized poly(4-vinylpyridine) films made this way promise to be superior materials for preconcentrating pertechnetate. Furthermore, we have recently discovered that high sensitivity can be coupled with ultra-thin sensor films as selective preconcentration media. Currently we are able to make films as thin as ca. 6-7 nm which is a thickness very close to the average surface roughness of the ITO coating on the sensor optical substrate. We have just begun to evaluate the very promising QPVP films for pertechnetate preconcentration. A series of film thicknesses need to be prepared for AFM measurements as well as for pertechnetate preconcentration. The data acquired from these measurements done in tandem for these films will reveal the crucial relationship between film structure and sensor function.
Project Details
Project type
Exploratory Research
Start Date
2004-12-03
End Date
2005-12-05
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Nebojsa Pantelic, Ph.D. Thesis, (Chemistry) 2007.
Link to electronic document via www.ohiolink.edu: http://olc1.ohiolink.edu/search/X?SEARCH=nebojsa+pantelic&SORT=D