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Title: Selective detection of heavy metal ions by self assembled chemical field effect transistors

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 Cr{sup 3+} and Cr{sup 6+}. This result supports the claim that high selectivity can be achieved by designing self-assembled bonding for lead, arsenic, chromium, cesium, mercury, and cadmium.
Authors:
; ; ;  [1]
  1. NanoSonic, Inc., 158 Wheatland Drive, Pembroke, Virginia 24136 (United States)
Publication Date:
OSTI Identifier:
22398935
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARSENIC; CADMIUM; CESIUM; CHROMIUM; CHROMIUM IONS; CONCENTRATION RATIO; FIELD EFFECT TRANSISTORS; GOLD; HEAVY METALS; LAYERS; LEAD IONS; MERCURY; MODIFICATIONS; NANOPARTICLES; SEMICONDUCTOR MATERIALS; SENSORS