▎ 摘　　要

NOVELTY - Structure comprises multi-element compound (MEC) nanoparticles (110), each having sites comprising elements, each site forming a compound bond with at least one other site of the compound nanoparticle. The compound bonds comprise a covalent bond, an ionic bond, and/or a metallic bond. Each MEC nanoparticle is formed of at least three different elements. The structure further comprises a coating formed on and enclosing at least part of the MEO nanoparticles. The one or more MEC nanoparticles comprises a multi-element oxide nanoparticle, a multi-element carbide nanoparticle, a multi-element intermetallic nanoparticle, a multi-element nitride nanoparticle, a multi-element amorphous glass nanoparticle, a multi-element diboride nanoparticle, a multi-element phosphide nanoparticle, a multi-element sulfide nanoparticle, a multi-element chalcogenide nanoparticle and/or a multi-element silicide nanoparticle. USE - Used as structure. ADVANTAGE - The method enables to make multi-element compound nanoparticles, which provides synergistic interaction between different elements that often outperforms their unary counterparts. DETAILED DESCRIPTION - INDEPENDENT CLAIMs are also included for: (1) a method comprising a providing a substrate with metal salt precursors thereon; and (2) method comprising: a providing a substrate with one or more high entropy alloy HEA nanoparticles thereon. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the simplified schematic diagram illustrating aspects of a conventional multielement nanoparticle having multiple phases. Multi-element oxide nanoparticle (110) Combination of oxygen (112) Group (116)