Production of Fe and Cu Nanocrystalline Particles by Thermal Decomposition of Ferr- and Copper-Cyanides

Epitaxial Growth of Diamond-Shaped Au1/2Ag1/2CN Nanocrystals on Graphene

“…It has been shown that metal cyanide complexes can be easily decomposed in the solid phase because the ionic bonding between metal cations and CN − ions is relatively weak [31]. These facts were experimentally shown in the 1990s from ex situ studies of solid-phase thermolysis of several metal cyanides to metallic Au, Ag, Cu, Hg, and Fe (at ~300-~400 • C) [25,26,32]. Recent studies have shown that gold(I) cyanide (AuCN) can be decomposed to form metallic gold by various energy sources including heat, electron beams, ion beams, and optical laser [17,31,33].…”

“…These facts imply that the nature of preferential and epitaxial growth could be a universal characteristic of metal cyanides [21], which also have 1D chain structures. Although there exist various types of cyanide complexes based on single and mixed metal elements (Au, Ag, Cu, Hg, and Fe) [24][25][26][27], investigations on epitaxial growth have been performed only for the above-mentioned four materials (AuCN, AgCN, CuCN, and Cu 0.5 Au 0.5 CN). Therefore, a question is raised whether other types of metal cyanides form nanostructured materials epitaxially aligned on 2D materials.…”

Synthesis of nanoparticles using vapor-phase decomposition of copper(II) acetylacetonate

“…Possible reactions of the formation of copper oxides can be written down as (19) (20) (21) It is also necessary to take into account the reaction of secondary oxidation of Cu 2 O (22) Note that reactions (19) and (20) can be excluded from consideration, because, as was shown by Nagase et al [36], the copper oxidation occurs in a stage-bystage manner: copper(0) copper(I) copper(II). This order known as the Baikov principle of consecutive transformations [37] is probably explained by the higher activation energy of direct copper(0) copper(II) transition compared to two-stage transition.…”

“…Okuyama [20] used β -diketonate complexes of various metals for the vapor-phase synthesis of superconducting particles of bismuth, strontium, and calcium oxides, as well as of the mixtures of copper oxides. Daroczi et al [21] utilized the preparation of copper and iron nanoparticles by the thermal decomposition of copper ferrocyanide in an open vertical tube. There are no published data on the synthesis of copper and copper oxide particles in the gaseous phase involving Cu(acac) 2 , except for our latest studies [22][23][24][25][26].…”

“…This order known as the Baikov principle of consecutive transformations [37] is probably explained by the higher activation energy of direct copper(0) copper(II) transition compared to two-stage transition. Thus, the formation of copper(II) oxide particles can be considered as a sequence of the formation of copper(I) oxide [according to reaction (21)] and its secondary oxidation by reaction (22) with the formation of copper(II) oxide. The rate of reaction (21) is limited only by the flux of copper dimers (with the energy exceeding energy barrier E 1 , Eq.…”