Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

Abstract

A comprehensive review on designs and mechanisms of semiconducting metal oxides with various nanostructures for room-temperature gas sensor applications.

Benchmarking β‐Ga2O3 Schottky Diodes by Nanoscale Ballistic Electron Emission Microscopy

“…Two different scenarios might be invoked. The first one involves surface/interface adsorption of ionic species (Figure 6b) and relies on the general ionosorption theory, which is the paradigm of oxygen‐sensing for several n ‐type semiconducting metal oxides (e.g., SnO 2 , TiO 2 , ZnO) 19,38. The model assumes that atmospheric oxygen adsorbs on the semiconductor surface as molecular and atomic ions (e.g., ) that trap electrons from the conduction band.…”

A Gas‐Sensitive SPIM Sensor for Detection of Ethanol Using SnO2 as Sensing Element

“…When a reducing gas is introduced, the adsorbed oxygen reacts with the reducing gas, which leads to release electrons, reduce the width of the electron depletion layer and decrease the resistance. In our study, the measurements were carried out at room temperature, where ethanol reacted with adsorbed oxygen, mainly in the form of O 2 − , to be decomposed into carbon dioxide and water . A schematic illustration of the sensing principle based on SnO 2 is depicted in Figure c.…”

“…In our study, the measurements were carried out at room temperature, where ethanol reacted with adsorbed oxygen, mainly in the form of O 2 À , to be decomposed into carbon dioxide and water. [4,[27][28][29][30] A schematic illustration of the sensing principle based on SnO 2 is depicted in Figure 6c. To realize higher sensing performance such as a high sensitivity and a rapid response at room temperature, the use of nanostructures, [31] doping, [32] and light activation [33,34] are prospective strategies to be applied to the gassensitive SPIM sensor.…”

“…As one of the most investigated material of gas sensors, tin dioxide (SnO 2 ) has attracted much attention for a long time due to its low cost and good sensitivity to the target gas. [1][2][3][4] While a conventional gas sensor detects the gas concentration at a single location, there exist many applications where the distribution and flow of gases are of interest. On a macroscopic scale, a simple approach is to use an array of sensors for spatially resolved measurement of gas concentration.…”

Nanoparticles Assembled CdIn2O4 Spheres with High Sensing Properties towards n-Butanol

“…With the rapid development of society and progress in industry, the increasing air pollution is becoming an urgent global problem [1,2]. In particular, volatile organic compounds (VOCs) are harmful for both human health and environmental safety, as their concentration exceeds a critical threshold [3,4].…”