A solid-state methane gas sensor based on PbS colloidal
nanocrystals has been fabricated and tested for the first time. PbS
nanoparticles have been synthesized during an all-chemical process and its
X-ray diffraction (XRD) pattern has been analyzed to verify the quality and
estimate the particle size of produced nano-powder. TEM microscopy and size
estimation by XRD analysis both confirm the production of 40-nm PbS
nanoparticles. The sensor was fabricated by the drop casting method on
interdigitated electrodes and tested at different conditions.
The best achieved
sensitivity was 47.6% for 5% methane concentration at room temperature. A
comprehensive discussion on sensing mechanism, temperature dependence, and
sensor's benefits is also provided in this paper.
The sensor has the benefit of
room temperature detection and being highly sensitive. Moreover, the sensor's
detection range is 1%-5% which is of superior importance in air quality
monitoring and safety control systems in industrial environments to prevent
suffocation and explosion.
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