Recent Development of Hierarchical Metal Oxides Based Gas Sensors: From Gas Sensing Performance to Applications

Abstract

applied in various fields including mining, aviation, medical diagnostics, food safety, automobile industry, indoor air quality monitoring, and environmental pollution control, etc. [1][2][3][4][5][6][7] Among them, due to the close relationship with human health, the applications of gas sensors in indoor air quality monitoring, breath analysis, and food safety have received wide attentions. [8][9][10] Conventionally, several

Ti3AlC2 MAX phase conversion to a novel 2D titanium carbo-oxide by an eco-friendly and low-cost method: highly selective gas sensing and supercapacitor evaluations

“…Although many efforts have already been devoted to developing high-performance materials for supercapacitors and gas sensors, there is still a constant search to improve the performance and production costs of functional materials. [14][15][16][17][18] Among the best-known conventional nanostructured materials are two-dimensional (2D) nanomaterials, which have attracted increased interest due to their outstanding electrical, magnetic, and mechanical properties. 19,20 In 2011, a new family of 2D transition metal carbides, nitrides, and carbonitrides (MXene) represented by the general formula of M n + 1X n T x (n = 1, 2, 3, or 4), where M is an early transition metal, X is carbon and/or nitrogen, and T x is the surface terminal groups, such as -O, -OH, and/or -F species, was discovered.…”

Recent Progress in Self-Powered Wireless Sensors and Systems Based on TENG

“…Food deterioration can produce some toxic gases. In the factory operating environment, combustible gases (steam) and toxic gases (steam) are often produced due to leakage, volatilization, or other reasons [ 103 , 104 , 105 , 106 ]. Figure 8 c shows a self-powered full-set ammonia leakage monitoring device and system [ 107 ].…”

Recent Progress in Amine Gas Sensors for Food Quality Monitoring: Novel Architectures for Sensing Materials and Systems

“…As previously mentioned, MOS (metal oxide semiconductors), which include n-type (ZnO, TiO 2 , In 2 O 3 , SnO 2 , and WO 3 ) and p-type (CuO, PdO, and NiO) materials, have been widely exploited as sensing materials for the fabrication of chemiresistive sensors as a result of their high sensitivity and low-cost. ,, The surface-adsorbed oxygen ions play an important role for the sensing mechanism of these materials, and to activate the chemiresistive mechanisms in these materials and achieve reversibility, thermal energy is essential . Consequently, chemiresistive gas sensors based on MOS usually work at elevated temperatures (e.g., 150–400 °C), which can limit their practical application for food quality monitoring .…”