Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh;
Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh;
Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh;
Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh;
Department of Chemistry Jahangirnagar University Savar Dhaka-1342 Bangladesh;
Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh;
Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh;
ZnS; nanoparticles; cobalt doped; bandgap; precipitation method;