Pbs‐field‐effect‐transistor for heavy metal concentration monitoring

Abstract

A. simple and inexpensive Pbs-FET with high sensitivity and short response time was developed which consists of a PbS layer on a pH-sensitive gate of a field effect transistor. The PbS-layer was prepared with simple wet precipitations technique. The PbS-FET has about the same selectivities for Pb2+-and for Cu''-ions, but only slight sensitivity for Cd2+-and Zn2+-ions. The sensor was integrated in a FIA system. By variing the injection time the measuring range varied between l o -' -l o p 6 and lo-'-l o p 8 mol Pb2+/1. The PbS-FET-FIA system is suitable for monitoring of Pb2+ concentrations in drinking water.

Heavy Metal Ion Detection Platforms Based on a Glutathione Probe: A Mini Review

“…Similar to other biochemical sensors, there are three important components in an HMI sensor: analyte recognition, physical support for probe immobilization, and signal transduction. Various types of sensors have been reported, including nanoparticles [15][16][17], field effect transistors (FETs) [18][19][20], and working electrodes for voltammetric analysis [21]. In terms of signal transduction, there are mainly optical [15] and electrochemical methods [4].…”