A Silver-Based Miniature Gas Sensor for Hydrogen Sulfide Detection

Hydrogen sulfide (
$\text{H}_{{2}}\text{S}$
) exists widely in many industrial processes and natural environments. Due to its high toxicity and flammable, detection of
$\text{H}_{{2}}\text{S}$
is critical for safety and health at work place and industrial process control. In this article, we report a novel miniature gas sensor, which has a high selectivity in
$\text{H}_{{2}}\text{S}$
detection. The sensor is based on the principle of silver reacting with
$\text{H}_{{2}}\text{S}$
with a strict condition and a fast speed at high temperature. The limit of detection (LOD) is 1.4 parts-per-million (ppm) in ambient conditions and can be further reduced to ~ppb-lever by improving the working temperature and suppressing the noise of the sensor system. Compared with the conventional
$\text{H}_{{2}}\text{S}$
sensors, this sensor has advantages of miniaturization, low cost, high selectivity, and excluding electrolytes in the analyte detection.