Indium oxide microcubes (IMCs) have been systematically synthesized by the hydrothermal method. The size of IMCs is systematically controlled by varying urea concentration (0.05–0.25 M) in the bath. The phase pure cubic indium oxide (In2O3) with preferred orientation along (222) direction is observed. The size of IMCs changes from 0.4 to 1.2 μm by varying urea concentrations. The urea concentration dependent plausible growth mechanism of IMCs is proposed. The defective IMCs have effectively used as NO2 sensors and have shown a gas response of 180 under the exposure of 80 ppm NO2 gas at low‐operating temperature (100 °C). However, IMCs exhibited shorter response (Rs = 4 s) and recovery time (Rc = 100 s) for 80 ppm NO2 gas. IMCs have shown selective to NO2 than NH3, CO2, and acetone.
Nanograined zinc oxide (ZnO) thin films are synthesized by successive ionic layer adsorption and reaction (SILAR) method. The structural analysis reveals synthesized films show phase pure ZnO with wurtzite crystal structure. The deposited ZnO thin films show interconnected nanograins with porous morphology. The ZnO films exposes liquefied petroleum gas (LPG) and shows gas response of 18% under the exposure of 2600 ppm LPG at 673 K. The palladium (Pd) sensitization significantly improves the LPG sensing properties. The Pd sensitization improves gas response up to 80% under exposure of 5200 ppm at 498 K. The response and recovery time are 60 and 50 s, respectively.
The copper oxide (CuO) nanostructures are synthesized via facile oxidation of Cu foil in an aqueous KOH solution at room temperature. A precleaned Cu foil immersed in a 0.1 M aqueous KOH solution for different time periods (36–72 h) systematically converts its surface into nanochained to rice husk morphology and then agglomerated dense nanoclusters. The impact of immersion time on the morphology and consequently supercapacitor performance is studied. The CuO nanostructure synthesized at an immersion time of 60 h shows a maximum specific capacitance of 302 Fg–1 at a scan rate of 2 mV s−1. The capacitance retention reaches up to 87% after 2000 cycles.
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