70,639 research outputs found
Electrical Nanoprobing of Semiconducting Carbon Nanotubes using an Atomic Force Microscope
We use an Atomic Force Microscope (AFM) tip to locally probe the electronic
properties of semiconducting carbon nanotube transistors. A gold-coated AFM tip
serves as a voltage or current probe in three-probe measurement setup. Using
the tip as a movable current probe, we investigate the scaling of the device
properties with channel length. Using the tip as a voltage probe, we study the
properties of the contacts. We find that Au makes an excellent contact in the
p-region, with no Schottky barrier. In the n-region large contact resistances
were found which dominate the transport properties.Comment: 4 pages, 5 figure
Improvement of control and analysis techniques of a SPM model
Bakalářská práce se zabĂ˝vá zdokonalovánĂm vĂ˝ukovĂ©ho modelu mikroskopu atomárnĂch sil (AFM). SoučástĂ práce je rešerše stávajĂcĂch analogii mezi makroskopickĂ˝mi jevy a fenomĂ©ny spojenĂ˝mi s mikroskopii rastrovacĂ sondou. Dále byla vybrána vhodná analogie, která byla následnÄ› implementována do jiĹľ existujĂcĂho modelu mikroskopu atomárnĂch sil. Do modelu byl integrován i jednodeskovĂ˝ poÄŤĂtaÄŤ, kterĂ˝ zajistĂ ovládánĂ i bez nutnosti pĹ™ipojenĂ externĂho poÄŤĂtaÄŤe. Na závÄ›r byly vyhodnoceny vlastnosti pouĹľitĂ© sondy a analogie mezi modelem a skuteÄŤnĂ˝mi mikroskopy atomárnĂch sil.This Bachelor Thesis is focused on development of a model of an atomic force microscope (AFM). First part of the thesis is research of already existing analogies between macroscopic phenomena and phenomena connected to scanning probe microscopy. A suitable analogy was chosen and implemented into an existing AFM model. A single-board computer was integrated into the model to enable control without connecting an external computer. In final chapters, probe behaviour and analogies between the model and real atomic force microscopes are discussed.
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