A cobalt(ii)heteroarylalkenolate precursor for homogeneous Co₃O₄ coatings by atomic layer deposition

Abstract

We present a new and efficient cobalt precursor, Co II (DMOCHCOCF 3 ) 2, to prepare Co 3 O 4 thin films and conformal coatings. In the synthesis of this Co complex, heteroaryl moieties and CF 3 -groups were combined leading to high thermal stability and volatility precursor. The suitability of this precursor for ALD deposition was tested on flat silicon substrates and TiO 2 /C nanofibers upon process optimization. Deposition at 200ºC results in homogeneous and smooth Co 3 O 4 thin films with a growth per cycle of 0.02 nm/cycle. Conformal coatings have been successfully obtained on TiO 2 /C nanofibers being thus an attractive platform for surface chemistry studies on high aspect ratio structures for future photocatalysts, sensors, supercapacitors and batteries.

Molecular Thorium Compounds with Dichalcogenide Ligands: Synthesis, Structure, 77Se NMR Study, and Thermolysis

“…Thermolysis , of carefully designed molecular precursors is potentially useful as a low-temperature synthesis approach to metastable solid-state materials, with compounds 1 and 4 presenting an opportunity to explore the low-temperature preparation of ternary solid-state materials. Of the two, the I/SeSe combination found in 4 was the most promising candidate to form a ternary phase at elevated temperatures because of the relative electronegativity of I and Se.…”

Thorium Cubanes–Synthesis, Solid-State and Solution Structures, Thermolysis, and Chalcogen Exchange Reactions

“…Molecular thermolysis , is potentially useful as a low-temperature approach to the synthesis of metastable solid-state materials, and the heterochalcogen compounds 3 and 4 present a unique opportunity to explore the low-temperature preparation of ternary solid-state materials. Thermolyses of 3 and 4 were performed at the same temperature conditions as for previously reported monomeric Th­(EPh) 4 compounds (Scheme ).…”

In Situ Monitoring of Dynamic Photocatalysis of Metal–Organic Frameworks by Three-Dimensional Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy

“…Conventional disinfection technologies, such as chemical spray inactivation and ultraviolet irradiation inactivation, might produce harmful byproducts, limiting their practical applications. Although heterogeneous photocatalysts can serve as sustained disinfectants since they can generate reactive oxygen species (ROS) against pathogens by photocatalysts, − their antipathogen efficiency is far from meeting demand, especially in the presence of other pollutants [e.g., particulate matter (PM), bioaerosols, etc. ]. , Alternatively, metal–organic frameworks (MOFs), as an up-to-date type of disinfectant, are expected to surpass traditional semiconductors owing to their unique photocatalytic features: (1) the photocatalytic performance of MOFs can be optimized at the molecular level by rationally adjusting metal clusters or organic ligands; (2) the large and well-arranged pore structure of MOFs is conducive to the introduction of guest molecules, which can directly contact the active sites on MOFs, thereby shortening the electron transport distance and improving the transport efficiency of carriers; and (3) the exposed unsaturated metal sites in MOFs serving as active sites could promote the photocatalytic reaction. − Thus, various MOFs have been designed and synthesized to date by changing or modifying metal sites and organic ligands.…”