Construction of In2O3/ZnO yolk-shell nanofibers for room-temperature NO2 detection under UV illumination

Flexible All‐Inorganic Room‐Temperature Chemiresistors Based on Fibrous Ceramic Substrate and Visible‐Light‐Powered Semiconductor Sensing Layer

“…[ 8 ] Under visible light illumination, since both In 2 O 3 and g‐C 3 N 4 can absorb visible light, a large number of electron–hole pairs will be generated and the adsorption process is promoted, resulting in more adsorbed oxygen molecules. [ 23 ] Such enhanced oxygen adsorption under light illumination is verified by the O 2 ‐ temperature programmed desorption (TPD) results in Figure 6c through comparing the oxygen adsorption with and without light illumination. [ 42 ] After the gas sensor is exposed to NO 2 , the NO 2 molecules will capture electrons from the sensing materials directly and/or through the competitive adsorption with the adsorbed oxygen, as described in Equations ( 1 ) and ( 2 ).…”

“…It is worth noting that the proposed ZIC sensor shows higher room‐temperature sensitivity, lower LOD, and faster response/recovery speed as compared to the previous sensors that work at room temperature or even hundreds of degrees. [ 18 , 21 , 23 , 53 , 54 , 55 , 56 , 57 ] More importantly, the unique advantages in gas permeability and mechanical flexibility make it more valuable for application in skin‐attachable wearable sensors than fragile room‐temperature inorganic semiconductor chemiresistors.…”

“…[ 21 ] Recently, visible‐light‐powered gas sensors have been intensively studied on In 2 O 3 , which has a visible‐light‐responsive indirect bandgap of 2.8 eV. [ 22 , 23 ] Although much progress has been achieved, the high recombination rate of photogenerated carriers and the limited visible‐light absorption of pure In 2 O 3 seriously restrict their gas‐sensing performance. To address this, the most effective solution is to construct In 2 O 3 ‐based heterojunction by grafting proper secondary semiconductor with suitable energy band.…”

Fast and recoverable NO2 detection achieved by assembling ZnO on Ti3C2Tx MXene nanosheets under UV illumination at room temperature

“…S14† and the reactions of the recovery process are illustrated in eqn (5) and (6). 76,77 Therefore, the recovery time will decrease significantly. The most important thing is that the light only assists the sensor to recover quickly, rather than the entire response/recovery process, which helps to maintain the stability of the sensor.…”

Nitrogen doped In2O3–ZnO nanocomposite mesoporous thin film based highly sensitive and selective ethanol sensors

“…Fabrication of nanocomposite thin films significantly enhances the sensing characteristics due to their varying compositions and the synergistic effects (geometrical effects, chemical effects and electronic effects) in the composites. 12,13 The nanoscale heterojunctions in the composite thin films modify the electronic structure and increase the oxygen vacancy concentration, which in turn improves the selectivity and sensitivity towards gases. 14,15 In 2 O 3 and ZnO are two common SMOs that have been extensively studied for gas sensing.…”