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