Shape Control of Cobalt Carbonate Particles by a Hydrothermal Process in a Mixed Solvent: An Efficient Precursor to Nanoporous Cobalt Oxide Architectures and Their Sensing Property

Abstract

Shape-controlled synthesis of CoCO 3 crystals has been achieved by a hydrothermal process in a mixed solvent of water and ethanol (or glycerol). Uniform CoCO 3 crystals with novel structures can be fabricated by tuning the volume ratio of water and ethanol (or glycerol). The results demonstrated that the as-prepared CoCO 3 crystal can act as an efficient precursor for production of nanoporous Co 3 O 4 particles with pore sizes of 2.5 and 60 nm by calcination at 500 °C. The nanoporous Co 3 O 4 particles show sensitive response and reversibility in sensing performance.

Magnetic greigite (Fe3S4) nanomaterials: Shape-controlled solvothermal synthesis and their calcination conversion into hematite (α-Fe2O3) nanomaterials

“…This kind of synthetic route, which generally involves starting with a bulk solid and obtaining a nanostructure by structural decomposition, is named after "Top-down process". Taking CdO [26] and Co 3 O 4 [27] nanoporous architectures as examples, they could be prepared simply by thermal decomposition of CdCO 3 and CoCO 3 in air, respectively.…”

Hydrazine-cadmium tellurite hybrid microcrystals: An efficient precursor to porous cadmium telluride and tellurium architectures through its thermal decomposition

“…It should be very interesting to study the evolution of morphologies and phase transformations during the thermal decomposition process. Since hydrazine is a very volatile material and a strong reducing agent, its vaporization should lead to highly porous structures as has previously been reported when CO 2 gas was evolved [28,29].…”

Tuning the Morphology of Metal Oxides for Catalytic Applications

“…[124][125][126][127][128][129][130][131][132][133][134][135] To date, hydrothermal and solvothermal treatments are still the major routes to fabricate these Co 3 O 4 superstructures. [126][127][128][129][130][131][132][133][134] Unfortunately, most of the hierarchical nanostructures consisted of arrays of interconnected particles with porous structures. [124][125][126][127][128] Although the building blocks were nanocubes, nanorods, and nanosheets with very smooth surfaces ( Figure 10.5c-h), nanosheets usually have diameters of several hundred nanometers or even several microns ( Figure 10.6).…”

“…[126][127][128][129][130][131][132][133][134] Unfortunately, most of the hierarchical nanostructures consisted of arrays of interconnected particles with porous structures. [124][125][126][127][128] Although the building blocks were nanocubes, nanorods, and nanosheets with very smooth surfaces ( Figure 10.5c-h), nanosheets usually have diameters of several hundred nanometers or even several microns ( Figure 10.6). [134][135][136][137][138][139][140][141][142][143][144][145] Hollow nanowires, nanotubes, nanoboxes, and nanocages have also been synthesized.…”