Highly sensitive and selective Gd2O3-doped SnO2 ethanol sensors synthesized by a high temperature and pressure solvothermal method in a microreactor

摘要: Abstract Gd 2 O 3 -doped SnO nanoparticles as highly sensitive and selective ethanol sensor materials with uniform size distributions were synthesized in ethylene glycol at 250 °C 20 bar a continuous tubular microreactor. The samples characterized by DLS, XRD, SEM, EDX, TEM, FTIR, BET surface area measurement techniques. As 5 wt% is added to , the average particle crystallite sizes of decrease from 22 11.9 nm 10 3.8 nm, respectively. responses sensors containing 0–10.0 wt% calcined 450 °C measured presence 300 ppm CO, 10–1000 ppm 1.0 vol% methane air 150–430 °C. 10 wt% methane, three volatile organic compounds, 150 °C. At same low temperature, content increases 2.5 10%, its response dramatically enhances about 263 times resistance changes more than 4 orders magnitude. Relative humidities higher 50% eliminate 10% –SnO CO CH shows absolute selectivity ethanol.