Online Study On Electrical Property Of Nanomaterials

The traditional testing technology was usually confined to the large number ofnanometer materials, giving the whole properties of nanoscale materials or theaverage overall effect, little determined with single nanometer structure (such as asingle nanoparticles, nanowires, nanobelts, nanotubes, and nanorods). Therefore,micromanipulation technology is burgeoning day by day, and gradually applied toperformance testing of the nanometer materials.The scanning electron microscope micro/nano testing and processing platform isa combination of a scanning electron microscope and micromanipulations, which hasextended the human hands and eyes to the nano-scale. As observing in the real-time,we can manipulate and measure the nanomaterials on-line in the scanning electronmicroscope simultaneously. This has promoted the development of nanotechnology.This topic is based on the testing and processing platform and implemented the theelectrical properties on-line measurement of nanomaterials. Its main content is dividedinto three parts:The first part proposed the thought of establishing mathematical model toguidance the fabrication process of tungsten nanoprobes. Then, the mathematicalmodel to reveal the relation between pulling up speed, time, and the aspect ratio wasestablished. Based upon the model, pulling up tungsten wire gradually whileelectrochemical etching conducted, the probes with pre-determined straight line andexponential curve composited contour and aspect ratio were fabricated. Theexperimental values and theoretical design value give the better coherent, whichproves the mathematic model rational in turn.In the second part, we prepared electron beam curable epoxy-based conductiveadhesive doped with different conductive particles. Then, their curing properties werecharacterized by the infrared spectra measured before and after cured, which showsthat the conductive adhesive can be cured by the radiation of electron beam in ascanning electron microscope, and the extent of curing is very high. And the theresistance of a curable adhesive was measured using improved four-probes methodIn the third part, the tungsten nanoprobe prepared in the first part and the electronbeam curing conductive adhesive prepared in the second part were applied to the scanning electron microscope micro/nano testing and processing platform. And theelectrical property of carbon nanotubes and zinc oxide were researched throughestablishing ohmic contact.