1 research outputs found
Polyaniline/CuO Nanoparticle Composites for Use in Selective H<sub>2</sub>S Sensors
For
ambient use, flexible hydrogen sulfide (H2S) gas
sensors based on polyaniline (PANI) and copper oxide nanoparticles
(CuO NPs) were investigated. PANI/CuO nanocomposites made by in situ
(P-1) and bilayer (P-2) methods have shown high performances when
sensing H2S of 0–25 ppm concentration in ambient
conditions. The P-2 sensor maintained high sensitivity (S = 7.25) and excellent responsiveness (ΔRe = 188%). The P-1 sensor had high responses (<30 s), linearity
(R2 = 99.5%), and stability, while the
CuO NP sensor was especially sensitive (S = 13.5)
within 0–10 ppm of H2S concentration. In addition,
the flexible/conformable composite sensors had excellent H2S selectivity and bending stability. The enhancements of the composite
sensors are mainly attributed to the PANI/CuO heterojunction formation
that effectively reduced the PANI band gap from 2.51 eV (PANI) to
2.48 eV (P-1) and further down to 2.43 eV (P-2) for improved conductivity
and charge-transport efficiency in the semiconductor network. The
X-ray photoelectron spectroscopy analyses identified elements and
valence band energy changes before and after H2S exposure.
This study used facile methods for preparing nanocomposite-based gas
sensors for the development of cost-effective, sensitive, conformable,
durable, and ambient workable devices for monitoring fresh food quality
in the food supply chain and environment safety for mining and petrochemical
industry