透射电子显微镜(transmission electron microscopy,TEM)在工作状态时要求精确的合轴,电子枪作为TEM电子光学系统主要部件之一,要求电子源必须与镜筒中整个电磁透镜系统严格合轴,否则会造成到达样品的电子束流减少,引入球差等不良影响...透射电子显微镜(transmission electron microscopy,TEM)在工作状态时要求精确的合轴,电子枪作为TEM电子光学系统主要部件之一,要求电子源必须与镜筒中整个电磁透镜系统严格合轴,否则会造成到达样品的电子束流减少,引入球差等不良影响。在操作中灯丝像的对称性是判断电子枪是否合轴的重要判据。研究了TDX-200透射电子显微镜灯丝像的调节过程,给出了透射电子显微镜灯丝像的具体调节步骤,并通过课题室透射电子显微镜TDX-200进行了实际验证。展开更多
Highly adhesive cold cathodes with high field emission performance are fabricated by using a screen-print- ing method. The emission density of carbon nanotube （CNT） cold cathode reaches 207.0 mA cm-2 at an electric ...Highly adhesive cold cathodes with high field emission performance are fabricated by using a screen-print- ing method. The emission density of carbon nanotube （CNT） cold cathode reaches 207.0 mA cm-2 at an electric field of 4.5 Vμm-1 under continuous driving mode, and high peak current emission of 315.8 mA corresponding to 4.5 A cm 2 at the electric field of 10.3 V μm-1 under pulsed driving mode. The emission patterns of the cold cathodes are of excellent uniformity that was revealed by vivid luminescent patterns of phosphor coated transparent indium tin oxide （ITO） an- ode. The cold cathodes also exhibit highly stable emission under continuous and pulsed driving modes. The high adhe- sion of CNTs to molybdenum substrates results in robust cold cathodes and is responsible for the high field emission performance. This robust CNT emitter could meet the operating requirements of continuous and pulsed electron sources, and it provides promising applications in various vacuum- micro/nanoelectronic devices.展开更多
文摘透射电子显微镜(transmission electron microscopy,TEM)在工作状态时要求精确的合轴,电子枪作为TEM电子光学系统主要部件之一,要求电子源必须与镜筒中整个电磁透镜系统严格合轴,否则会造成到达样品的电子束流减少,引入球差等不良影响。在操作中灯丝像的对称性是判断电子枪是否合轴的重要判据。研究了TDX-200透射电子显微镜灯丝像的调节过程,给出了透射电子显微镜灯丝像的具体调节步骤,并通过课题室透射电子显微镜TDX-200进行了实际验证。
基金supported by the National Natural Science Foundation of China(51002161)One-Three-Five Strategic Planning of Chinese Academy of Sciences
文摘Highly adhesive cold cathodes with high field emission performance are fabricated by using a screen-print- ing method. The emission density of carbon nanotube （CNT） cold cathode reaches 207.0 mA cm-2 at an electric field of 4.5 Vμm-1 under continuous driving mode, and high peak current emission of 315.8 mA corresponding to 4.5 A cm 2 at the electric field of 10.3 V μm-1 under pulsed driving mode. The emission patterns of the cold cathodes are of excellent uniformity that was revealed by vivid luminescent patterns of phosphor coated transparent indium tin oxide （ITO） an- ode. The cold cathodes also exhibit highly stable emission under continuous and pulsed driving modes. The high adhe- sion of CNTs to molybdenum substrates results in robust cold cathodes and is responsible for the high field emission performance. This robust CNT emitter could meet the operating requirements of continuous and pulsed electron sources, and it provides promising applications in various vacuum- micro/nanoelectronic devices.
