What is the fine-grained topic of the following text: "The catalytic vanadium oxide nanoparticles are surrounded by a thin aluminum film, which effectively prevents the agglomeration and structural deformation of the internal particles," says Euiseob Yang from the Department of Chemical Engineering at UNIST partook as the first author of this study. Only return the topic.
The use of aluminum film to prevent agglomeration and structural deformation of catalytic vanadium oxide nanoparticles.