Alkali metal quaternary nanomaterials

A method for chemical synthesis of an alkali metal quaternary crystalline nanomaterial having general Formula A. wherein Formula A is I2-II-IV-VI4, the method comprising the following steps:

• selecting VI selected from the group:
• sulphur (S), selenium (Se) or tellurium (Te) and dissolving in an amphiphilic capping agent under inert conditions to form a first solution;
• heating a solvent under reflux to about between 75° C. and about 120° C., preferably about 100° C., to form a second solution;
• admixing the first and second solution and heating to about between 120° C. and about 220° C., preferably about 200° C., to form a third solution;
• dissolving at least one of the group:
• CuCl, LiCl, Li(acac), Li2S and NaCl in amphiphilic capping agent to form a fourth solution;
• adding the fourth solution to the third solution forming a fifth solution;
• adding at least one of zinc chloride or tin chloride into the fifth solution to form a sixth solution;
• allowing the sixth solution remain heated at about between 120° C. and about 220° C., preferably about 200° C., for between 30 min to 2 hours, preferably 1 hour.