Bio-mimicking graphene films,deposited on textured nickel substrates,were synthesized by the following method:replicating the surface textures of the lotus leaf by polymer duplication,fabricating textured nickel substrates by electroplating on the polymer coated with a Au film,preparing bio-mimicking graphene oxide films on the nickel substrates by vacuum filtration,and electrochemical reduction.By controlling the vacuum filtration,this replica method can not only replicate the lotus leaf structure by a graphene film,but also can achieve a novel cell-like graphene film.
YANG Juan YAN XlngBin WANG Ying LUO BaoMin WANG LiPing XUE QunJi
本文采用丝网印刷技术制备了具有高粘接性能的碳纳米管冷阴极.该碳纳米管冷阴极在直流连续及脉冲场下均具有优异的场发射性能,同时具有高发射电流密度与发射总电流,可以满足高功率器件对冷阴极电子源的使用需求.在直流连续场下,该冷阴极的电流发射密度可达到207.0 mA cm^(-2)(电场强度为4.5 Vμm^(-1)).在脉冲场(200 Hz,10μs)激发下,峰值电流密度最高可达4.5 A cm^(-2)(电场强度为103 Vμm^(-1)),同时具有高的峰值发射电流(315.8 mA).为观察阴极发射均匀性,采用荧光板为阳极进行实时监测,发现此印刷阴极发射较均一;稳定性测试表明该阴极在连续及脉冲场下均具有良好的发射稳定性.该冷阴极同时具有高电流密度及高发射电流,可以满足高功率真空电子器件的使用要求,在真空微纳电子器件中显示出巨大的应用前景.
In this paper, activated carbons （ACs） with high specific surface areas were successfully synthesized by simple one-step carbonization-activation from paulownia sawdust biomass, and the effects of the synthetic conditions on their CO2 capture capacity were investigated as well. The results show that, when the mass ratio between activator and biomass is 4, the activation temperature is 700℃ and the activation time is 1 h, as-made AC provides the most micropores for CO2 adsorption. As a consequence, the maximum CO2 uptake of 8.0 mmol/g is obtained at 0 ℃ and 1 bar.
Xiao-Li ZhuPei-Yu WangChao PengJuan YangXing-Bin Yan
Amorphous carbon nanoparticles （a-CNPs） on a multi-walled carbon nanotube （MWCNT） film, deposited on a silicon substrate, were synthesized using an electrodeposition combination from a methanol suspension of polydiallyldimethylammonium chloride-modified MWCNTs. A low-voltage electropho- retic deposition of the MWCNTs and a high-voltage electrochemical deposition of the a-CNPs were carried out to yield homogenously attached a-CNPs on the surfaces of the MWCNTs, and form a composite film with good adhesion to the substrate. This scalable technology can produce a large area of a-CNP/MWCNT film. And the field emission investigations show that the a-CNP/MWCNT film has turn- on electric field of 3.17 V μm- 1 （at 10 μA cm-2） and threshold field of 4.62 V μm-1 （at 1 mA cm-2）, which are lower than those of the MWCNT film. The a-CNP/MWCNT film can be deposited simply with large areas and may be a promising cathode material applied in field emission displays.
Juan YangXing-Bin YanJiang-Tao ChenDong-Fei SunQun-Ji Xue
