Description
The IDT SGAS707 is a solid-state chemiresistor sensor designed
to detect volatile organic chemicals (VOCs) in air. The sensor uses
an integrated heater with highly sensitive polymer-MOx composite
material designed for detection of VOCs.
The chemiresistor sensors in the IDT SGAS family are based on
the principle that metal-oxide materials undergo surface interactions (physisorption and chemisorption) with gas molecules at
elevated temperatures, resulting in a measurable change in
electrical resistance. As metal-oxide materials are polycrystalline
(i.e., composed of multiple grains with distinct grain boundaries),
the adsorbed gases have significant electronic effects on the
individual grains. These gas-solid interactions result in a change in
electron (or hole) density at the surface (i.e., a space charge forms),
which in turn changes the electrical conductivity of the oxide. IDT
has developed a set of nanostructured gas-sensing materials with
excellent sensitivity and stability.

Features
 High sensitivity to a wide range of VOCs
 Non-specific: responds to many different organic vapors
 Typical response time < 1 minute to 90% full scale
 Environmental temperature range: 0°C to 40°C
 Environmental humidity range: 0% to 90% RH,
noncondensing