Monodisperse triangle MnO nanocrystal/reduced graphene oxide for improved NO2 detection at room temperature with enhanced moisture resistance

High-performance gas-sensitive materials must exhibit improved resistance to moisture essential criterion for their effectiveness. In this work, monodisperse triangle MnO nanocrystals were synthesized through the hot injection method. Then, they were evenly spread across the reduced graphene oxide (rGO) surface in a uniform dispersion. The optimized MnO/rGO exhibited high sensitivity (R a /R g =47.0) and quick response, with a lower detection limit. Furthermore, it shows strong moisture resistance in a high-humidity environment (80 % relative humidity). The comprehensive wrapping of stearate ligands proved highly effective in preventing water vapor infiltration. This robust shielding significantly boosted the composite's hydrophobic nature, markedly enhancing its resistance to moisture. This approach offers a pioneering avenue for gas sensors to detect NO 2 effectively at room temperature, even within high-humidity environments.