Sequential Phase Transition during Fabricating β-Ag₂S Film on Ag Electrode by Wet Chemical Process

Abstract

A wet chemical process was used for low-cost fabrication of Ag2S flat thin films on the Ag electrodes utilized for an atomic switch. By precisely controlling the dipping condition, a flat thin film of β-Ag2S (cubic) was successfully fabricated. When a Ag thin film was dipped into a 0.01%-Na2S aqueous solution, α-Ag2S (monoclinic) was first precipitated, and then β-Ag2S, a Ag(I) ion conductor, was precipitated on the surface after dipping for 12 h. Because the ion-conduction in β-Ag2S is much larger than that in α-Ag2S with negligibly small, the results are important information for utilization of Ag2S for electric devices such as atomic switch. By combining the fabricated β-Ag2S electrodes with an organic field effect transistor structure, a Ag wire was grown on the surface of the β-Ag2S electrode only when the FET was in the "on" state.

Performance of Ag–Ag2S core–shell nanoparticle-based random network reservoir computing device

“…In the first stage, the Ag-Ag 2 S core-shell NPs were synthesized using the Brust-Schiffrin procedure according to previous works. 14,27) Structural properties such as particle dimension and chemical bonding at the surface of NPs were previously determined by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. 26) The resulting NPs were core-shell structures with dimensions of a few tens of nanometers.…”

Ag2S atomic switch-based ‘tug of war’ for decision making

“…‡ A former study suggests that only β-Ag 2+δ S is able to sufficiently transport Ag + ions to build a filament. 22 However, we are not convinced that their XRD spectrum actually belongs to β-Ag 2+δ S. 23 Also this crystal phase is reported to be unstable at room temperature. 24 α-Ag 2+δ S. Because of the isolation layer on top, sulfurisation was limited to the edges of the electrode, resulting in protruded α-Ag 2+δ S around the original position of Ag, especially in larger electrodes, see Fig.…”

Recent progress in nanostructured silver sulfide: from synthesis and nonstoichiometry to properties

“…This type of heterostructures that contain Ag and Ag 2 S nanowires or an Ag lm with Ag 2 S/Ag nanoclusters are considered for the production of biosensors, 183 resistive switches, and nonvolatile memory devices. [48][49][50]194,197,199 The action of the resistive switch is based on the phase transformation between nonconducting a-Ag 2 S acanthite and superionic b-Ag 2 S argentite.…”