Facile Synthesis and Fine Morphological Tuning of Ag₂O

Abstract

The morphological evolution of the Ag2O cubic crystal system was examined with the goal of controlling and fine-tuning the morphologies of the microcrystalline products. A variety of Ag2O microcrystalline shapes could be prepared through the reduction of a silver-pyridine complex in solution at room temperature. The concentrations NaOH and AgNO3 significantly affected the morphology of the Ag2O final product. The Ag2O morphology evolved from a simple truncated cube to an 8-pod with three arms along the ⟨111⟩ directions as the concentration of NaOH increased. The Ag2O morphology evolved from an edge-truncated cube to a rhombic dodecahedron as the total reactant concentrations increased, holding the AgNO3/pyridine/NaOH molar ratio constant. The morphological evolution from an 8-pod to a rhombic dodecahedron via an 8 × 3-pod, a 6 × 4-pod, a smoothed squared 6-pod, a concave rhombic dodecahedron, and a truncated rhombic dodecahedron was also observed. The crystal growth mechanism underlying the morphological evolution of Ag2O microcrystals is discussed.

Pure green chemical approach for synthesis of Ag2O nanoparticles

“…Over the past decade, a variety of techniques have been employed for the synthesis of Ag 2 O with different morphologies. For example, the Ag 2 O hexapod was prepared by making silver ions (Ag + ) react with hydroxide ions in the presence of ammonia, pyridine, or bis-(p-sulfonatophenyl)phenylphosphine dihydrate dipotassiumto control the morphological shapes (8)(9)(10)(11). A lot of electrochemical synthesis methods offered Ag 2 O particles in different shapes in micro and nanosizes (12,13).…”

Facet‐Dependent Electrical Conductivity Properties of Silver Oxide Crystals

“…It is also ap -type semiconductor with an arrow band gap of 1.46 eV.A g 2 Oc rystals with cubic, octahedral,a nd rhombicd odecahedral morphologies and sharp faces have been reported. [18][19][20][21][22][23] Very recently,w eh ave developed as impler methodt o prepareA g 2 Oc rystals with diverses hapes including rhombic dodecahedra. [24] The facet-dependent photocatalytic activities of Ag 2 Oc ubes, octahedra, and rhombic dodecahedra were also compared, showingt heir relative catalytic activity order is completely reversed of that seen in Cu 2 Oc rystals.…”

Green Synthesis of Ag Thin Films on Glass Substrates and Their Application in Surface-Enhanced Raman Scattering

“…This is probably because the cluster Figure 3(a); all peaks correspond to those reported for bulk Ag 2 O with a cubic structure (JCPDS file 12-0793). 23 To further confirm the formation of Ag atoms from Ag 2 O, XPS was used to examine the change in oxidation state for Ag after the reduction reaction had occurred.…”