Silver Clusters on Silver Sulfide Nanocrystals:  Synthesis and Behavior after Electron Beam Irradiation

Abstract

Nanocomposite crystals, (Ag)(x)(Ag(2)S)(y) with x < y, are synthesized in micellar media. The generation of Ag clusters on Ag(2)S nanocrystals is attributed to the reduction of mobile Ag(+) ions in the Ag(2)S nanocrystals by sulfur derivatives. The proportions in the composite material can be modulated by electron beam irradiation. Using dodecanethiol as surface passivating agent, 2D self-organizations of these nanocomposite crystals are produced.

[Ag115S34(SCH2C6H4tBu)47(dpph)6]: synthesis, crystal structure and NMR investigations of a soluble silver chalcogenide nanocluster

“…The grid was washed three times with toluene (2 μL) afterwards. Since sulfur compounds are not stable when exposed to the electron beam, 36,37 the expected particles in the micrographs should consist of Ag with trace amounts of S. Nevertheless the size of the particles provides information about the cluster core size. If a significant decomposition of the cluster in organic solvents occurs, the size of the remaining and/or reassembled particles should be significantly different from the values measured by XRD.…”

A Late Triassic Dinosauromorph Assemblage from New Mexico and the Rise of Dinosaurs

“…20. A minority of segments are Ag-rich with little or no S, probably due to the decomposition of Ag-S compounds by the electron beam (38). This beam damage also distorted the phase and prevented accurate images from being acquired with high-resolution TEM.…”

Ag nanoprisms with Ag2S attachment

“…On the other hand, Ag 2 S is both a direct narrow-band-gap semiconducting metal sulfide and an effective ionic semiconductor in which Ag + ions behave just like free electrons in metals resulting in cationic vacancy rich Ag 2 S phase3940. Such unique chemical and structural properties could endow it as an excellent host mediator for preparation of Ag 2 S-based heterodimers with improved properties36373842434445. In addition to the connectivity to Ag, Ag 2 S nanocrystals have also been demonstrated recently to act as a mediator/catalyst for preparation of semiconductor/semiconductor heterodimers such as Ag 2 S/ZnS and Ag 2 S/CdS in solution41.…”