Variable dimensional structure and interface design of In2O3/rGO nanocomposites with oxygen vacancy for enhancing NO2 sensing performance

Polar Cubic CeO2 Nanoparticles on Graphene for Enhanced Room-Temperature NO2 Sensing Performance

“…In general, upon exposure to air, O 2 absorbs and captures electrons from the composites to produce O 2 – at RT. When the sensor is exposed to NO 2 , NO 2 molecules react with adsorbed oxygen to capture electrons, and the hole density increases. − Since the electron affinity to NO 2 (2.27 eV) is higher than that to O 2 (0.45 eV), the CeO 2 /graphene composites behave as a p-type semiconductor with the decrease in resistance. − normalO 2 ( g a s ) + normale − → normalO 2 ( a d s ) − normalN normalO 2 ( g a s ) + normalO 2 ( a d s ) − + 2 normale − → normalN normalO 2 ( a d s ) − + 2 normalO false( normala normald normals false) − normalN normalO 2 …”

Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu2O-Decorated rGO/In2O3 Nanorices for Sensitive SO2 Gas Sensors

“…SO 2 could behave as a reducing agent (electron donor) or an oxidizing agent (electron acceptor) depending primarily on the temperature. 21 When the temperature is as low as 200 °C, SO 2 would be an oxidizing gas and chemisorbed as SO 2…”

“…In addition, loading or doping with additives and forming nanocomposites with other nanostructures are effective approaches widely used to improve the gas-sensing properties of In 2 O 3 -based sensors. ,,,− Among the numerous potential additives, reduced graphene oxide (rGO) or graphene is especially favorable for the development of metal oxide gas sensors due to their excellent electron mobility and high gas adsorption capacity . Recently, rGO was utilized as an additive to enhance the SO 2 sensing properties of SnO 2 sensors, leading to a superior response of 10.9–500 ppm SO 2 at 200 °C .…”

Hierarchical In2O3/rGO nanostructures with uniformly distributed In2O3 nanoparticles: microwave-assisted synthesis and improved NO-sensing performance

“…32,33 In 2 O 3 /rGO nanostructures with different morphologies were synthesized to improve the gas-sensing properties. With GO as the precursor, various In 2 O 3 /rGO nanostructures with flower-like In 2 O 3 , 34 aerogel-supporting In 2 O 3 nanospheres, 35 and porous In 2 O 3 sheets 36 were prepared using a traditional hydrothermal method. Han et al 36 constructed the rGO/h-In 2 O 3 -sheet composite consisting of porous In 2 O 3 sheets with rGO modification, and the composite showed a better NO 2 -detection performance than the rGO/hc-In 2 O 3 -rod consisting of random In 2 O 3 nanorods and rGO sheets.…”

“…With GO as the precursor, various In 2 O 3 /rGO nanostructures with flower-like In 2 O 3 , 34 aerogel-supporting In 2 O 3 nanospheres, 35 and porous In 2 O 3 sheets 36 were prepared using a traditional hydrothermal method. Han et al 36 constructed the rGO/h-In 2 O 3 -sheet composite consisting of porous In 2 O 3 sheets with rGO modification, and the composite showed a better NO 2 -detection performance than the rGO/hc-In 2 O 3 -rod consisting of random In 2 O 3 nanorods and rGO sheets. Other methods including the electrospinning technique, 37 reflux method, 38 ultrasonic mixing method, 39 microwave-assisted hydrothermal method 40 and facile precipitation method 41 were also used to synthesize In 2 O 3 /rGO composites.…”