TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The metallic nanoparticles are grown from metal ions bonded to the linkers. Each of the dielectric particle supporters includes material(s) chosen from silicon oxide, hafnium oxide, aluminum oxide, zirconium oxide, barium-titanium composite oxide, yttrium oxide, tungsten oxide, tantalum oxide, zinc oxide, titanium oxide, tin oxide, barium-zirconium composite oxide, silicon nitride, silicon oxynitride, zirconium silicate, hafnium silicate, and polymers. The metallic nanoparticles are chosen from metal nanoparticles, metal oxide nanoparticles, metal nitride nanoparticles, metal carbide nanoparticles, and intermetallic compound nanoparticles. The metallic nanoparticles are arranged separately from one another and form a single monomolecular layer. Preferred Property: The metallic nanoparticles have average particle diameter of 2-3 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The organic surfactant comprises an organic material (A) and an organic material (B). The organic material (A) is a nitrogen-containing organic material or a sulfur-containing organic material. The organic material (B) is a phase-transfer catalyst-based organic material. The linkers comprise organic monomolecules bonded to surfaces of the dielectric particle supporters, and functional groups (122) bonded to surfaces of the dielectric particle supporters, functional groups (126) bonded to the metallic nanoparticles, and chain groups (124) for connecting the functional groups (A) and (B) to each other. The functional group capable of being bonded to the metal ions is chosen from amine group, carboxyl group and thiol group.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The flexible substrate is a polymer including polyethylene terephthalate, polyethylene naphthalate, polyimide, polycarbonate, polypropylene, triacetyl cellulose, polyethersulfone, and polydimethylsiloxane. The nano structure further comprises dielectric organic material and/or an inorganic oxide, and an organic surfactant bonded to the metallic nanoparticles, and a nanoparticles layer comprising metallic nanoparticles spaced apart from each other and dielectric material bonded to a surface of each metallic nanoparticles formed over the supporter layer. The supporter layers and nanoparticles layers are stacked alternately and repeatedly to form a vertical multi-stack structure.