DOI: 10.17586/2226-1494-2016-16-6-1056-1062


FEATURES OF MEASURING IN LIQUID MEDIA BY ATOMIC FORCE MICROSCOPY

M. V. Zhukov, I. V. Kukhtevich


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For citation: Zhukov M.V., Kukhtevich I.V. Features of measuring in liquid media by atomic force microscopy. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2016, vol. 16, no. 6, pp. 1056–1062. doi: 10.17586/2226-1494-2016-16-6-1056-1062

Abstract

Subject of Research.The paper presents results of experimental study of measurement features in liquids by atomic force microscope to identify the best modes and buffered media as well as to find possible image artifacts and ways of their elimination. Method. The atomic force microscope Ntegra Aura (NT-MDT, Russia) with standard prism probe holder and liquid cell was used to carry out measurements in liquids. The calibration lattice TGQ1 (NT-MDT, Russia) was chosen as investigated structure with a fixed shape and height. Main Results. The research of probe functioning in specific pH liquids (distilled water, PBS - sodium phosphate buffer, Na2HPO4 - borate buffer, NaOH 0.1 M, NaOH 0.5 M) was carried out in contact and semi-contact modes. The optimal operating conditions and the best media for the liquid measurements were found. Comparison of atomic force microscopy data with the results of lattice study by scanning electron microscopy was performed. The features of the feedback system response in the «probe-surface» interaction were considered by the approach/retraction curves in the different environments. An artifact of image inversion was analyzed and recommendation for its elimination was provided. Practical Relevance. These studies reveal the possibility of fine alignment of research method for objects of organic and inorganic nature by atomic force microscopy in liquid media.


Keywords: atomic force microscopy, probe, buffered media, calibration lattice, image artifact

Acknowledgements. The work was partially financially supported by the Government of the Russian Federation (grant 074-U01), the Russian Foundation for Basic Research (16-32-00806).

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