Abstract
Nanostructured materials enable the development of miniature sensing devices that are compact, low-cost, low-energy-consumption, and easily integrated into field-deployable units. Recently we have successfully developed electrochemical sensors based on functionalized nanostructured materials for the characterization of metal ions. Specifically, glycinylurea self-assembled monolayer on nanoporous silica (Gly-UR SAMMS) has been incorporated in carbon paste electrodes for the detection of toxic metals such as lead, copper, and mercury based on adsorptive stripping voltammetry, while acetamide phosphonic acid self-assembled monolayer on nanoporous silica (Ac-Phos SAMMS) has been used for the detection of uranium. Both electrochemical sensors yield reproducible measurements with excellent detection limits (at ppb level), are selective for target species, does not require the use of mercury film and chelating agents, and require little or no regeneration of electrode materials. The rigid, open, paralleled pore structure combined with suitable interfacial chemistry of SAMMS also results in fast responses of the electrochemical sensors.
Original language | English (US) |
---|---|
Article number | 91 |
Pages (from-to) | 554-560 |
Number of pages | 7 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5593 |
DOIs | |
State | Published - 2004 |
Externally published | Yes |
Event | Nanosensing Materials and Devices - Philadelphia, PA, United States Duration: Oct 25 2004 → Oct 28 2004 |
Keywords
- Acetamide phosphonic acid
- Glycinyl-urea
- Lead
- SAMMS
- Self-assembled monolayer on mesoporous silica
- Uranium
- Voltammetry
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering