NANOSTRUCTURED POROUS SILICON AND LUMINESCENT POLYSILOLES AS CHEMICAL SENSORS FOR CARCINOGENIC CHROMIUM(VI) AND ARSENIC(V)
Description:
The chief goal is to develop new selective solid state sensors for carcinogenic and toxic chromium(VI) and arsenic(V) in water based on redox quenching of the luminescence from nanostructured porous silicon and polysiloles.
Record Details:
Record Type:PROJECT(
ABSTRACT
)
Start Date:01/01/2002
Completion Date:12/31/2004
Record ID:
54415
Keywords:
WATER, DRINKING WATER, GROUNDWATER, CARCINOGEN, TOXICS, HEAVY METALS, EFFLUENT, DISCHARGE, INNOVATIVE TECHNOLOGY, MONITORING, ANALYTICAL, MEASUREMENT METHODS, REMOTE SENSING, INDUSTRY.,
Related Organizations:
Role
:OWNER
Organization Name
:UNIVERSITY OF CALIFORNIA - SAN DIEGO
Mailing Address
:9500 Gilman Dr
Citation
:La Jolla
State
:CA
Zip Code
:92093
Project Information:
Approach
:Nanostructured porous silicon, as well as polysilole nanowire coatings, will be chemically modified to enhance binding of the chromate and arsenate anions. Chemical modification to vary the redox potential of the polysilole excited state will also be used as a way to impart chemical selectivity. Both sensor approaches will be combined by encapsulating the polysilole in a nanotextured microcavity between two Bragg stacks constructed from porous silicon. Such optical devices have been shown to provide significant detection sensitivity enhancements. The nanoporous material will readily admit small inorganic analytes, such as chromate and arsenate, and exclude biomolecules that might confound the measurements. Sensors based on silicon wafer and polymer technologies are also readily adaptable to fabrication. The fluorescence quenching detection modality is also manufacturable. The essential electronics requires a blue or UV LED as the excitation source and an inexpensive photodiode detector.
Cost
:$400,000.00
Research Component
:Nanotechnology
Project IDs:
ID Code
:R829619
Project type
:EPA Grant