Green synthesis of ZnCeO₂ and ZnCuCeO₂ nanocomposites for enhanced gas sensing: a synergistic approach towards sustainable ammonia detection

This study explores the synthesis of a novel n–p–n junction nanocomposite comprising cerium oxide (CeO₂), copper oxide (CuO), and zinc oxide (ZnO) using an eco-friendly approach involving Azadirachta Indica (neem leaves) extract. The combination of these metal oxides forms a heterostructure Nanocomposite (NC) designed for enhanced gas sensing, particularly focusing on the detection of ammonia gas. The green synthesis method, utilizing neem leaves extract, offers sustainability and reduced environmental impact compared to conventional chemical methods. The synthesized ZnCeO₂ and ZnCuCeO₂ NCs are characterized for structural (XRD), morphological (SEM) Chemical states (XPS), Optical (UV–Vis) and Gas sensing studies. The NCs unique composition aims to leverage synergistic effects, resulting in improved sensitivity and selectivity for gas sensing applications. The integration of CuO is expected to enhance overall sensor performance in ZnCuCeO₂ NC with a quick response time of 3.2 s and recovery time of 2.6 s. The study emphasizes the significance of such NCs in contributing to environmental monitoring, and agricultural practices, making strides towards sustainable gas detection technologies.