Sparse-coding denoising applied to reversible conformational switching of a porphyrin self-assembled monolayer induced by scanning tunnelling microscopy.

摘要: Scanning tunnelling microscopy (STM) was used to induce conformational molecular switching on a self-assembled monolayer of zinc-octaethylporphyrin graphite/tetradecane interface at room temperature. A reversible change controlled by applying tip voltage observed. Consecutive STM images acquired alternating voltages showed that 0.4 V the porphyrin presents arrangement formed alternate rows with two different types structural conformations and when potential is increased 0.7 only one type conformation. In this paper, we characterize these dynamics analyzing images, which were improved for better quality interpretation means denoising algorithm, adapted process from state art image processing analysis methods. remains best technique 'see' manipulate matter atomic scale. very sharp few angstroms surface can provide molecules atoms powerful resolution. However, are strongly affected noise necessary correct eliminate. This paper about new computational tools specifically developed denoise STM. The algorithms tested in obtained temperature, function bias voltage. Images high resolution, real time, show porphyrins have arrangements whether or V.