Similarly, studies concerning metal adsorption are largely focused on the effect of single atom adsorption, and investigating its influence on various properties such as electronic properties (Cr, Mn, Fe, Co, Ni, Cu, etc. on WS 2 , Pd on WSe 2 ) , spintronics (3d transition metals on WS 2 ) , and gas sensing (Pd, Ag, Au, Pt on WSe 2 , Na, Li, Pd on WTe 2 ) .