https://dberard.com/home-built-stm/
This project is my attempt to build a low-cost scanning tunneling microscope (STM) capable of atomic resolution imaging in air. The piezo scanners typically used in STM typically cost at least hundreds of dollars. Some time ago I came across John Alexander’s simple STM project, in which he used a cheap piezo buzzer element with one of the electrodes cut into quadrants to enable XYZ motion. This type of scanner is less rigid than what is usually used for STM, but I decided to give it a try and see how far I could get with it. Turns out I was able to image highly-oriented pyrolytic graphite (HOPG) with my STM with atomic resolution! The image below shows the hexagonal lattice structure of graphite.
Home-Built STM
This project is my attempt to build a low-cost scanning tunneling microscope (STM) capable of atomic resolution imaging in air. The piezo scanners typically used in STM typically cost at least hundreds of dollars. Some time ago I came across John Alexander’s simple STM project, in which he used a cheap piezo buzzer element with one of the electrodes cut into quadrants to enable XYZ motion. This type of scanner is less rigid than what is usually used for STM, but I decided to give it a try and see how far I could get with it. Turns out I was able to image highly-oriented pyrolytic graphite (HOPG) with my STM with atomic resolution! The image below shows the hexagonal lattice structure of graphite.Overview of the technique
STM is a tool capable of imaging surfaces with atomic resolution. In STM, a sharp metallic needle is brought within a few angstroms of the surface of a conductive sample and a small bias voltage is applied across the gap. If the gap is small enough (<1 a="" achieve="" across="" acts="" all="" ambient="" amplifier.="" amplifier="" an="" and="" applied="" are="" as="" atom="" atomic="" atomically="" atoms="" axes="" be="" by="" can="" capable="" closer="" closest="" conditions.="" constant="" constructed.="" controls="" cross="" current="" directions.="" distance.="" electrode="" electrons="" enough="" even="" exponential="" exponentially.="" fed="" feedback="" flow="" function="" gap="" hard="" his="" if="" image="" images="" in="" increases="" individual="" into="" is="" loop="" maintain="" makes="" measured="" measuring="" might="" motion="" mounted="" moves="" na="" nbsp="" nearly="" nm="" not="" of="" on="" p="" pa="" piezo="" piezoelectric="" position="" quantum="" range="" raster="" relationship="" resolution.="" resolve="" resulting="" sample.="" sample="" scan="" scanner="" sensitive="" sharp="" single="" stm="" sub-angstrom="" surface="" the="" then="" therefore="" think="" this="" through="" tip-sample="" tip="" to="" topography="" transimpedance="" tunneling.="" tunneling="" tunnelling="" typically="" under="" used="" via="" voltage="" what="" which="" will="" with="" y="" you="" z-axis="">
For more about this project, click one of the links below or in the top menu:
ONE MORE HERE:
Another one here:
http://www.instructables.com/id/A-Low-Cost-Atomic-Force-Microscope-%E4%BD%8E%E6%88%90%E6%9C%AC%E5%8E%9F%E5%AD%90%E5%8A%9B%E9%A1%AF%E5%BE%AE%E9%8F%A1/
No comments:
Post a Comment