 perovskite nanostructures have been studied extensively for their potential applications as light harvesters and catalysts. However, these structures are often unstable in polar solvents such as water, limiting their practical use. In this study, the authors investigated the effect of ethanol treatment on cesium lead bromide nanocrystal, CSPBBR3NCs, leading to the formation of CSPBBR3 perovskite nano aggregates with improved stability in water. The authors also examined the interface between the CSPBBR3NCs and ethanol, revealing the presence of ethoxide ions at the interface, which stabilizes the CSPBBR3NCs in water. Furthermore, the authors used ethoxide, stabilized CSPBBR3NCs to reduce O3 plus 2O0 to form water-stable O2 CSPBBR3 nanocomposites. The authors then explored the possibility of using plasmonic metal perovskite nanocomposites to control the interface properties and enhance the efficiency of the perovskite material. This article was authored by Pooja Agrawal, Monica Alavut and Vishal Govind Rao. We are article.tv. Links in the description below.