Premium
Sensors for carbon monoxide based on Pd/SnO 2 /CNT nanocomposites
Author(s) -
Hu Qinghua,
Liu Shantang,
Lian Yongfu
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431392
Subject(s) - carbon monoxide , nanocomposite , materials science , tin oxide , chemisorption , catalysis , carbon nanotube , dissociation (chemistry) , detection limit , selectivity , nanoparticle , monoxide , chemical engineering , doping , repeatability , palladium , nanotechnology , inorganic chemistry , chemistry , metallurgy , chromatography , optoelectronics , organic chemistry , engineering
This study investigates using a Pd 2+ ‐doped Pd/SnO 2 /CNT nanocomposite (Pd 2+ /SnO 2 /CNT) sensor to detect carbon monoxide (CO). Using a simple, controllable sol‐gel method, we synthesized a CNT that was coated by Pd 2+ ‐doped SnO 2 nanoparticles. The prepared materials are highly sensitive to CO at a low temperature and demonstrate a fast response‐recovery time. The hybrid Pd 2+ /SnO 2 /CNT sensors exhibit high sensitivity, selectivity, repeatability, a low limit of detection (5 ppm, R a / R g = 1.95), and a fast response‐recovery ( t 90 ≤2 s) to CO at 100 °C. The sensitivity of the materials was improved to 80 times higher than pure tin oxide at a CO concentration of 500 ppm. Such behaviors may be attributed to the catalytic activity of the PdO nanoparticles, the active reaction site that was generated by the CNT, and the enhanced chemisorption and dissociation of the gas.