DNA/octadecylamine(ODA) monolayers were transferred onto silicon substrates and the morphologies of the monolayers were investigated by Atomic Force Microscope(AFM). AFM images show that the morphologies of DNA dissol...DNA/octadecylamine(ODA) monolayers were transferred onto silicon substrates and the morphologies of the monolayers were investigated by Atomic Force Microscope(AFM). AFM images show that the morphologies of DNA dissolved in pure water are very different from those of DNA dissolved in the NaCl solution. When DNA molecules are dissovled in pure water, they will form ball-like structure in the monolayer. When the DNA molecules are dissolved in NaCl solution, they will form bunch lines. This DNA line offers a valuable template to direct the formation of unique inorganic nanomaterials.展开更多
A novel aerosol method for the production of alighed carbon nanotubes was presented. Multi-walled carbon nanotubes(MWNTs) with fairly uniform diameters and aligned MWNT bundles were obtained by using solutions of orga...A novel aerosol method for the production of alighed carbon nanotubes was presented. Multi-walled carbon nanotubes(MWNTs) with fairly uniform diameters and aligned MWNT bundles were obtained by using solutions of organometallics such as ferrocene in hydrocarbon solvents. A hollow and multi-walled structure was observed with diameter ranging from 15 to 50 nm,leading aspect ratio to be over 200. The quality of the product is dependent on the pyrolysis temperature,carrier gas flow rate and the catalyst precursor concentration. For the sample synthesized at 900 ℃,G/D is 1.81. G/D of samples obtained at 850 ℃ and 800 ℃ are 1.18 and 0.77,respectively. The inclusion of acetylene to an atomized spray of ferrocene in hexane yield aligned MWNT bundles with a narrow diameter distribution.展开更多
文摘DNA/octadecylamine(ODA) monolayers were transferred onto silicon substrates and the morphologies of the monolayers were investigated by Atomic Force Microscope(AFM). AFM images show that the morphologies of DNA dissolved in pure water are very different from those of DNA dissolved in the NaCl solution. When DNA molecules are dissovled in pure water, they will form ball-like structure in the monolayer. When the DNA molecules are dissolved in NaCl solution, they will form bunch lines. This DNA line offers a valuable template to direct the formation of unique inorganic nanomaterials.
基金Projects(50772033 50372020) supported by the National Natural Science Foundation of China
文摘A novel aerosol method for the production of alighed carbon nanotubes was presented. Multi-walled carbon nanotubes(MWNTs) with fairly uniform diameters and aligned MWNT bundles were obtained by using solutions of organometallics such as ferrocene in hydrocarbon solvents. A hollow and multi-walled structure was observed with diameter ranging from 15 to 50 nm,leading aspect ratio to be over 200. The quality of the product is dependent on the pyrolysis temperature,carrier gas flow rate and the catalyst precursor concentration. For the sample synthesized at 900 ℃,G/D is 1.81. G/D of samples obtained at 850 ℃ and 800 ℃ are 1.18 and 0.77,respectively. The inclusion of acetylene to an atomized spray of ferrocene in hexane yield aligned MWNT bundles with a narrow diameter distribution.
