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Molecular layer deposition method for preparing titanium-containing organic-inorganic composite film
Atomic layer deposition (atomic layer deposition) is an advanced thin film deposition technology that has been rapidly developed in recent years. It has excellent advantages such as excellent uniformity, step coverage, conformality, repeatability, and precise control of thickness at the atomic scale. The use of atomic layer deposition technology to design and synthesize new functional nanomaterials and develop their applications in the fields of energy, catalysis, and environment are the current research hotspots.
Under the strong support of the Chinese Academy of Sciences, the National Natural Science Foundation of China, and the Ministry of Science and Technology, researchers from the 903 Group of State Key Laboratory for Coal Conversion of the Shanxi Coal Chemistry Research Institute of the Chinese Academy of Sciences have made progress in the preparation of new functional nanomaterials by atomic layer deposition. The results were published in Angew. Chem. Int. Ed. (2013, 35, 9196); ACS Nano (2012, 6, 11009); Adv. Funct. Mater. (2012, 24, 5157) and Small (2012, 25, 3390).
The controllable and orderly assembly of nanoparticles from the bottom-up method can result in special physicochemical properties that are different from those of general particle aggregates. The relevant researchers passed the German Maple Solids Research Institute and the German Maple Intelligent Systems Institute. Researchers from the University of Montreal and the Spanish CIC nanoGUNE Consolider Research Center, based on guided physical effects of Rayleigh instability, using carbon nanospiral as a template, successfully using ion sputtering and atomic layer deposition techniques The nanoparticle-shaped alumina-coated gold nanoparticle chains, the gold nanoparticles are super-regularly arranged, and the distance between the particles is determined by the rotation cycle of the carbon nanohelix. This study is free from the limitation of the Rayleigh-instability effect and enriches the This physical effect. The researchers further observed by confocal laser scanning microscopy that the alumina-coated gold nanoparticle chains exhibited a strong surface plasmon resonance effect.
Theoretical simulation and electron energy loss spectroscopy (EELS) analysis results show that the plasma nano-bean pod material has excellent subwavelength waveguide performance and is expected to be used in the field of optical nanodevices. The relevant results were published in Adv. Funct. Mater. (2012, 24, 5157) and were selected as the bottom cover article.
When the size of the material is reduced to the nanometer scale, a unique small size effect, a surface effect, a quantum size effect, and a macro quantum tunnel effect are exhibited, and the conventional body is exhibited in optical, electrical, magnetic, thermal, and sensitive materials. Different characteristics and functions of phase materials.
Recently, the researchers of the research group cooperated with researchers from the 909 Group of State Key Laboratory of Coal Conversion, the German Mape Institute for Microstructure Physics, the University of Montreal, and the Spanish CIC nanoGUNE Consolider Research Center to use atomic layer deposition technology for carbon nanotubes (CNTs). NiO nanoparticles with controlled size and uniform distribution were obtained on the surface. The effect of NiO particle size on the electrochemical performance of NiO/CNTs composites was studied. The results showed that the electrochemical activity of NiO/CNTs was enhanced with the increase of NiO size. Decreased, in which NiO (4.9 nm)/CNTs obtained by deposition of 400 cycles has the highest catalytic methanol oxidation activity, which is 88 times higher than commercial NiO nanopowders. The relevant results were published in Small (2012, 25, 3390) and were selected as bottom cover articles.
In addition, they collaborated with researchers from Hainan University and Fudan University to use atomic layer deposition techniques to coat Fe3O4 and Ni magnetic materials on chiral carbon nanohelices respectively. The results of transmission electron microscopy showed that the thickness of the magnetic coating prepared by this method Uniformly controllable. The researchers further conducted an electromagnetic wave absorption test on the composite material. The results show that by controlling the thickness of the magnetic material cladding layer, the electromagnetic parameters of the material can be effectively controlled and high-efficiency absorption performance can be obtained. The prepared magnetic coating is coated with a carbon nano-helix. The electromagnetic wave absorption field has important practical application value. The results were published on ACS Nano (2012, 6, 11009).
Recently, the research team of the research group has designed a new deposition of titanium-containing organics by collaborating with the scientists of the Institute of Chemistry of the Chinese Academy of Sciences and the researchers of the CIC nanoGUNE Consolider Research Center in Spain to design the surface chemical reaction of the molecular layer deposition process. - Method of inorganic composite membrane. After subsequent heat treatment to remove the organic components, the composite membrane is converted to a nitrogen-doped porous TiO2 membrane whose pore size is related to the length of the organic segments in the composite membrane. Thermogravimetry-mass spectrometry analysis showed that nitrogen was derived from the NH3 produced by the partial decomposition of organics.
Furthermore, nitrogen-doped porous TiO2/carbon nanocomposite spiral composites were prepared with carbon nanohelix as carrier. The composite exhibited good catalytic degradation of methylene blue in visible light. Such a nitrogen-doped porous TiO2 film with precisely controlled thickness can also be used in the field of visible light catalysis, solar cells, and the like. This result provides new ideas for the preparation of ultrathin organic-inorganic composite membranes with controllable composition and the controllable pore size of inorganic membrane materials using molecular layer deposition techniques. Related work was recently published on Angew. Chem. Int. Ed. (2013, 35, 9196).
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