Synthesis of stable cesium superoxide nanoparticles for gas sensing application by solution-processed spray pyrolysis method

Abstract

In the present work, we synthesized cesium superoxide (CsO2 ) nanoparticles by solution-processed spray pyrolysis technique. The as-synthesized CsO2 nanoparticles were characterized through Raman spectroscopy, X-ray diffraction, scanning electron microscopy and ultraviolet–visible spectroscopy. The CsO2 nanoparti-cle-based gas sensor is more selective towards the carbon dioxide (CO2 ) gas. The sensor shows good gas sensing performance for CO2 gas. Gas sensing mechanism is dominated by the adsorption and desorption process. Through this paper, we studied another dimension of gas sensing process by employing superoxide for gas sensing. The sensing mechanism for cesium superoxide is explained by newly designed ‘‘bridging oxygen-free mechanism’’.