Abstract: 3D bundle-shaped multi-walled carbon nanotubes and preparation method, includes the following steps: uniformly mixing bi-component alloy catalyst and transition metal in an inert gas environment in order to obtain a three-component nano-intermetallic alloy catalyst; disposing the intermetallic catalyst on the substrate; allowing hydrogen to flow through the substrate, and heating the substrate to a first temperature, and using the hydrogen to undergo a reduction of the intermetallic catalyst at the first temperature; applying a protective gas and a carbon source gas, heating the substrate to a second temperature, undergoing a reaction at the second temperature to generate the 3D bundle-shaped multi-walled carbon nanotubes, and collecting the 3D bundle-shaped multi-walled carbon nanotubes after annealing; wherein the second temperature is greater than or equal to the first temperature; a working electrode includes conductive drain material, a conductive bonding gent and a plurality of 3D bundle-shaped multi-wa

Abstract: A method for preparing a three-dimensional carbon nanotube composite structure comprises: providing a substrate; subjecting the substrate to nickel ion modification treatment to form at least one nickel ion nuclear seed on the substrate; providing a hydrogen gas to pass through the substrate and heating the substrate to a reduction temperature for reducing the nickel ion nuclear seed by the hydrogen gas at the reduction temperature; and supplying a carbon source gas and a protective gas to pass through the substrate and heating the substrate to a growth temperature so that the carbon atoms generated by the carbon source gas through the catalytic cracking of the nickel ion nuclear seed are deposited on the bottom of the nickel ion nuclear seed to form a carbon nanotube gradually, wherein the growth temperature is greater than or equal to the reduction temperature. The three-dimensional carbon nanotube composite structure prepared by the method and its application are also disclosed.

Abstract: 3D bundle-shaped multi-walled carbon nanotubes and preparation method, includes the following steps: uniformly mixing bi-component alloy catalyst and transition metal in an inert gas environment in order to obtain a three-component nano-intermetallic alloy catalyst; disposing the intermetallic catalyst on the substrate; allowing hydrogen to flow through the substrate, and heating the substrate to a first temperature, and using the hydrogen to undergo a reduction of the intermetallic catalyst at the first temperature; applying a protective gas and a carbon source gas, heating the substrate to a second temperature, undergoing a reaction at the second temperature to generate the 3D bundle-shaped multi-walled carbon nanotubes, and collecting the 3D bundle-shaped multi-walled carbon nanotubes after annealing; wherein the second temperature is greater than or equal to the first temperature; a working electrode includes conductive drain material, a conductive bonding gent and a plurality of 3D bundle-shaped multi-wa

Abstract: A method for detecting a gas sample includes the following steps of: providing a carbon aerogel sleeve; introducing a gas sample to the carbon aerogel sleeve, and then sequentially extracting, concentrating, activating, and re-concentrating the gas sample adsorbed by the carbon aerogel and detecting a concentration of the re-concentrated gas sample by a gas chromatograph-mass spectrometer (GC-MS); and extracting the carbon aerogel for several hours with reflux in a dichloromethane solvent and a n-hexane solvent several times per hour to remove the residual gas sample, and then drying the extracted carbon aerogel for reuse, wherein the dichloromethane solvent and the n-hexane solvent are at a volume ratio of 0.001-1000.

Abstract: A method for detecting a gas sample includes the following steps of: providing a carbon aerogel sleeve; introducing a gas sample to the carbon aerogel sleeve, and then sequentially extracting, concentrating, activating, and re-concentrating the gas sample adsorbed by the carbon aerogel and detecting a concentration of the re-concentrated gas sample by a gas chromatograph-mass spectrometer (GC-MS); and extracting the carbon aerogel for several hours with reflux in a dichloromethane solvent and a n-hexane solvent several times per hour to remove the residual gas sample, and then drying the extracted carbon aerogel for reuse, wherein the dichloromethane solvent and the n-hexane solvent are at a volume ratio of 0.001-1000.