Nano-crystalline diamond films are successfully deposited on silicon substrates via the hot filament chemical vapour deposition process using a CH_(4)/H_(2)/Ar gas mixture.The as-grown films are analysed by using fiel...Nano-crystalline diamond films are successfully deposited on silicon substrates via the hot filament chemical vapour deposition process using a CH_(4)/H_(2)/Ar gas mixture.The as-grown films are analysed by using field emission scanning electron microscopy,micro-Raman spectroscopy and x-ray diffraction.These results show that the films consist of nano-diamond grains with sizes ranging from 10 to 100 nm,and argon is an important element in the formation of nano-crystalline diamonds.展开更多
Field emission characteristics of single-walled carbon nanotubes were studied by using a simple method in a field emission microscope.The nanotube emission gun works effectively at the room temperature under a thresho...Field emission characteristics of single-walled carbon nanotubes were studied by using a simple method in a field emission microscope.The nanotube emission gun works effectively at the room temperature under a threshold field as low as 3.9mV/μm.A typical I-V relationship of field emission was obtained with a high current density.The observed stable bright spots on the fluorescent screen originate from an ensemble emission from micro-ropes of the single-walled carbon nanotubes.展开更多
The current blockage during DNA molecule translocation through a solid-state nanopore is very important in DNA analysis techniques based on nanopores.We use Poisson-Nernst-Planck descriptions of electrolyte behavior i...The current blockage during DNA molecule translocation through a solid-state nanopore is very important in DNA analysis techniques based on nanopores.We use Poisson-Nernst-Planck descriptions of electrolyte behavior in a nanopore with and without the presence of DNA molecules to simulate the nanopore conductance and current blockage of DNA molecules. Actual experimental parameters,such as pore size,length of nanopores,DNA drift velocity,and the charge issue of nanopores and DNA,are applied to evaluate the precise current blockage amplitude,which is found to agree very well with the experimental results.展开更多
基金Supported by Shenzhen Science and Technology Project(JCYJ20180306173022502)Shenzhen Strategic Emerging and Future Industrial Development Funds(20170426231005389)。
基金Supported by the National Natural Science Foundation of Beijing under Grant No.2002009.
文摘Nano-crystalline diamond films are successfully deposited on silicon substrates via the hot filament chemical vapour deposition process using a CH_(4)/H_(2)/Ar gas mixture.The as-grown films are analysed by using field emission scanning electron microscopy,micro-Raman spectroscopy and x-ray diffraction.These results show that the films consist of nano-diamond grains with sizes ranging from 10 to 100 nm,and argon is an important element in the formation of nano-crystalline diamonds.
基金Supported by the National Natural Science Foundation of China under Grant No.59672013the 3 rd“Zhou Peiyuan Special Foundation for Mathematics and Physics”。
文摘Field emission characteristics of single-walled carbon nanotubes were studied by using a simple method in a field emission microscope.The nanotube emission gun works effectively at the room temperature under a threshold field as low as 3.9mV/μm.A typical I-V relationship of field emission was obtained with a high current density.The observed stable bright spots on the fluorescent screen originate from an ensemble emission from micro-ropes of the single-walled carbon nanotubes.
基金Supported by the National Natural Science Foundation of China under Grant Nos 50902004 and 11023003the National Basic Research Program of China under Grant Nos 2009CB623703 and 2011CB707601the International Science&Technology Cooperation Program of China Sino Swiss Science and Technology Cooperation Program(2010DFA01810).
文摘The current blockage during DNA molecule translocation through a solid-state nanopore is very important in DNA analysis techniques based on nanopores.We use Poisson-Nernst-Planck descriptions of electrolyte behavior in a nanopore with and without the presence of DNA molecules to simulate the nanopore conductance and current blockage of DNA molecules. Actual experimental parameters,such as pore size,length of nanopores,DNA drift velocity,and the charge issue of nanopores and DNA,are applied to evaluate the precise current blockage amplitude,which is found to agree very well with the experimental results.
