International Islamic University;
H-10 Islamabad;
Pakistan;
Pakistan Institute of Engineering and Applied Sciences;
Islamabad 44000;
Pakistan;
Department of Chemistry;
Government College of Science;
Lahore;
Pakistan;
Hausmannite; Mn_(3)O_(4); Alumina; Band; gap; tuning; Interfacial; charge; transfer; Nanomaterials; Catalysis;