Effect of Pt, Pd, Au additives on the surface and in the bulk of tin dioxide thin films on the electrical and gas-sensitive properties

Abstract

The microstructure and properties of thin (~100 nm) SnO 2 films with noble metals Pt, Pd, Au additives, grown by dc magnetron deposition are studied. It is shown that the introduction of additives into the bulk and the deposition of dispersed catalysts on the semiconductor surface make it possible to control the sensor parameters in pure air and upon exposure to reduction (CO, H 2 , CH 4 ) and oxidation (NO 2 ) gases. Possible mechanisms for the effect of Pt, Pd, Au on the bulk and surface properties of tin dioxide are dis cussed. The technological conditions for film growth, which provide the selective detection of low concen trations (10-100 ppm) of CO and H 2 , below explosive concentrations (0.5-2.5 vol %) of methane, and trace concentrations (0.05-5 ppm) of NO 2 are determined.

The influence of gold nanoparticles on the conductivity response of SnO2-based thin film gas sensors

“…These results along with data given by Krivetskiy et al [15] indicate that modification by gold can also be effective in the development of SnO 2 -based sensors of ozone, acetone vapors, hydrogen, and so forth. Regarding NO 2 sensors, more research is needed because studies presented in [15,53,54] gave inconsistent results.…”

“…It should be noted that the absence of a significant shift in the sensor response maximum of the SnO 2 :Au-based sensors in the low-temperature range that is characteristic of the current experiments is also typical of almost all such studies [10,11,54,[57][58][59][60]. Almost all these studies were aimed at the development of sensors suitable for the sensor market, and therefore heat treatment at Т an ≥ 400°С was used in the fabrication technology.…”

Bio-green synthesis of Ni-doped tin oxide nanoparticles and its influence on gas sensing properties

“…Among various toxic gases, nitrogen dioxide (NO 2 ) gas is well known as an irritant gas that can cause respiratory infections, photochemical smog, acid rain 14 and it is harmful to human health and life. Numerous experimental investigations have been performed for improving the responses of the sensors via introducing various dopants of either metal oxides 23,24 or noble metals (Pd, Au, Pt, and Ag) [25][26][27] considering the formation of p-n junctions or catalytic activity of noble metals. With this motivation, extensive efforts have been focused on improving sensor sensitivity towards NO 2 gas.…”

Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd‐SnO2 Core@Shell Nanocomposites

“…For a closer look at the structure–function relation of catalysts and sensors, the location and the chemical state of the noble‐metal dopant are clearly important parameters for their performance . The performance and catalytic activity of the sensor are generally affected by the size and amount of metal clusters, their distribution, and their interaction with the support ,. To investigate the influence of these parameters on sensing and catalysis of Pd‐doped SnO 2 materials, we chose core@shell nanocomposites with Pd nanoclusters located either inside (Pd@SnO 2 ) or outside (SnO 2 @Pd) of the SnO 2 shell.…”