Solvent and catalyst-free synthesis of In2O3 octahedron using single-step thermal decomposition technique for NO2 detection

In this article, a highly crystalline In2O3 octahedron has been synthesized by a single-step solvent and catalyst-free thermal decomposition method. The as-synthesized sample has been characterized using XRD, FESEM, HR-TEM, and XPS. The characterization results confirmed the formation of the cubic phase of the In2O3 sample with the octahedron morphology. The gas sensing characteristics of the In2O3 octahedron sample for oxidizing and reducing gases have been investigated systematically. The optimum operating conditions for selective detection of chemical inputs have been determined. Additionally, a maximum sensor response (similar to 4252%) along with fast response (recovery) times similar to 30 s (13 s) has been obtained for NO2 gas (30 ppm) at its operating temperature 200 degrees C. The results suggested that the In2O3 octahedron sensor proposes a promising candidate for NO2 detection at its optimum operating temperature of 200 degrees C and can open up new ways to integrate these sensors with future electronic devices. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A highly crystalline In2O3 octahedron was synthesized in this article, with optimal operating conditions identified for gas sensing characteristics, particularly for NO2 detection. This study suggests that the In2O3 octahedron sensor shows promise for future integration with electronic devices.