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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