Solution-processed metal doping of sub-3 nm SnO₂ quantum wires for enhanced H₂S sensing at low temperature

Abstract

Doping a foreign atom to metal oxides enables the modulations of the electronic and chemical properties of active sites. SnO2 quantum wires (QWs) possessing large surface area with highly exposed...

Highly selective room temperature ammonia gas sensors based on d-band C-SnO2 and response behavior induced by oxidative and reductive role shifts

“…As known, the oxygen adsorption mechanism using the Wolkenstein model is the main method to generate a gas-sensitive response in semiconductor metal oxides. 39–41 SnO 2 is a common N-type semiconductor in sensing processes, and C-600 prepared in this work also shows the N-type response at high temperature. As has been reported in previous studies, 42 the semiconductor material adsorbs oxygen in air to form oxygen species, and the formation of oxygen species results in the transfer of electrons from the material surface to the adsorbed oxygen, leading to an increase in the depletion layer of the material and thus a higher resistance of the material.…”

Synthesis of Mesoporous Lanthanum-Doped SnO2 Spheres for Sensitive and Selective Detection of the Glutaraldehyde Disinfectant

“…The peak spacing of Sn 3d was 8.4 eV, which was consistent with the standard value of SnO 2 . As lanthanum doping contents increased, the Sn 4+ peaks of La-SnO 2 - x gradually shifted toward higher binding energies, indicating the transfer of electrons from Sn to La atoms . This suggested that lanthanum doping caused local distortion of the Sn–O bond.…”

Nanostructured metal oxide heterojunctions for chemiresistive gas sensors

“…Operating temperature is an important factor affecting the adsorption kinetics of the target gas on heterojunction surfaces. 139–141 At low working temperatures, especially at room temperature, gas sensors do not show significant variations in sensitivity, mainly due to the obtained energy being much lower than the activation energy required to absorb the target gases. Accordingly, the temperature should be improved for the normal operation of gas sensors based on nanostructured metal oxide heterojunctions for representative gas sensing.…”