Table 1 Hydrogen-sensing response of the In2O3 nanotowers sensor operated at 240 °C in comparison to those of the reported sensors using In2O3-based nano- or micro-structured materials
From: In2O3 Nanotower Hydrogen Gas Sensors Based on Both Schottky Junction and Thermoelectronic Emission
Type | Operated temperature (°C) | Response% (ΔR/R o*100 %) toward H2 under the following concentrations (ppm) | ||||||
---|---|---|---|---|---|---|---|---|
2 | 10–50 | 150–270 | 400–500 | 1000 | 2000 | 4000 | ||
In2O3 nanotowers | 240 | 13 | 21 | 50 | 64 | 83 | ||
In2O3 nanowires [3] | 400 | 17 | 60 | |||||
In2O3 nanoneedles [3] | 350 | 10.7 | 20 | |||||
ZnO/In2O3 nanorods [26] | 20–25 | 9.8 | 15.5 | 20.5 | ||||
In2O3 thin films [27] | 50 | 6.5 | ||||||
In2O3 nanowires [28] | 200 | 10 | ||||||
Au-loaded In2O3 nanofibers [29] | 140 | 33 | ||||||
In2O3 hollow nanospheres [30] | 300 | 41 | ||||||
In2O3 nanowires [31] | 300 | 69 | ||||||
In2O3/ZnO nanowires [32] | 400 | 83 | ||||||
In2O3 nanowires [32] | 300 | 71 | ||||||
In2O3 flower-like microspheres [33] | 150 | 10 | ||||||
In2O3 urchin-like microspheres [34] | 150 | 10 | ||||||
In2O3/La/Pd [35] | 100 | 3 | ||||||
In2O3 nanofibers [36] | 300 | 43 | ||||||
In2O3 nanowires [37] | 250 | 17.9 | ||||||
In2O3:Se [38] | – | 40 |