Selective detection of heavy metal ions by self assembled chemical field effect transistors
Abstract
Multiple layer-by-layer sensor material modifications were designed and implemented to achieve selectivity of semiconductor based chemical field effect transistors (ChemFETs) to particular heavy metal ions. The ChemFET sensors were fabricated and modified in three ways, with the intent to initially target first mercury and lead ions and then chromium ions, respectively. Sensor characterization was performed with the gate regions of the sensor elements exposed to different concentrations of target heavy metal ion solutions. A minimum detection level in the range of 0.1 ppm and a 10%–90% response time of less than 10 s were demonstrated. By combining layer-by-layer gold nanoparticles and lead ionophores, a sensor is produced that is sensitive and selective not only to chromium but also to Cr3+ and Cr6+. This result supports the claim that high selectivity can be achieved by designing self-assembled bonding for lead, arsenic, chromium, cesium, mercury, and cadmium.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 20, 2015
- Source ID
- 10.1063/1.4918988
Entities
People
- Elizabeth Gladwin
- Hang Ruan
- Richard O. Claus
- Yuhong Kang
Organizations
- United States Army