title: A simple route to synthesize size-controlled Ag(2)S core-shell nanocrystals, and their self-assembly.
abstract: Silver sulfide (Ag(2)S) nanocrystals were successfully synthesized by the thermal treatment of the single source precursors, silver dialkyldithiophosphates (Ag[S(2)P(OC(n)H(2n+1))(2)]), under mild reaction conditions. The size of Ag(2)S nanocrystals with regular shape can be controlled in the range of tens of nanometers by adjusting critical parameters, such as the carbon number of the substitute alkyl, the solvent and the reaction temperature. Electron diffraction and x-ray powder diffraction confirmed the orthorhombic phase of the Ag(2)S nanocrystals. The as-prepared Ag(2)S nanocrystals have an inorganic-organic core-shell structure, in which Ag(2)S nanocrystals are the inorganic core and the organic modifiers, consisting of oleylamine and dialkyldithiophosphate, are the shell. The organic modifiers were anchored to the surface of Ag(2)S nanocores by their active groups of -NH(2) and -SPS- , respectively, and their direct-alkyl chains spread to the outside. So, these as-prepared Ag(2)S nanocrystals can self-assemble to form orderly two-dimensional arrays easily, and they disperse in some non-polar solvents stably.
authors.affiliation: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Lou
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Wang
authors.forename: Miao
authors.initials: M
authors.lastname: Chen
authors.forename: Weimin
authors.initials: W
authors.lastname: Liu
authors.forename: Jincheng
authors.initials: J
authors.lastname: Hao