A method for synthesizing a metal chalcogenide nanocrystal (NC) material includes reacting a metal material and an ammonium chalcogenide material in an organic solvent material. The method provides that the metal chalcogenide nanocrystal material may be synthesized by a heating-up method at large scale (i.e., greater than 30 grams). Ammonium chalcogenide salts exhibit high reactivity and metal chalcogenide nanocrystals can be synthesized at low temperatures (i.e., less than 200.degree. C.) with high conversion yields (i.e., greater than 90 percent).
STATEMENT OF GOVERNMENT INTEREST
 The research that lead to the embodiments as described herein and the invention as claimed herein was funded by: (1) the United States National Science Foundation under grant number CHE-1152922 and grant number DMR-1120296; and (2) the United States Department of Energy under grant number DE-SC0001086. The United States Government has rights in the invention as claimed herein.