VGTU talpykla > Mechanikos fakultetas / Faculty of Mechanics > Moksliniai straipsniai / Research articles >

Lietuvių   English
Please use this identifier to cite or link to this item: http://dspace.vgtu.lt/handle/1/3861

Title: Modification of the AFM Sensor by a Precisely Regulated Air Stream to Increase Imaging Speed and Accuracy in the Contact Mode
Authors: Dzedzickis, Andrius
Bučinskas, Vytautas
Viržonis, Darius
Šešok, Nikolaj
Ulčinas, Artūras
Iljin, Igor
Šutinys, Ernestas
Petkevičius, Sigitas
Gargasas, Justinas
Morkvėnaitė-Vilkončienė, Inga
Keywords: atomic force microscopy
cantilever’s mathematical model
dynamic characteristics
nonlinear stiffness
high speed
Issue Date: 2018
Publisher: MDPI
Citation: Dzedzickis, A.; Bucinskas, V.; Viržonis, D.; Sesok, N.; Ulcinas, A.; Iljin, I.; Sutinys, E.; Petkevicius, S.; Gargasas, J.; Morkvenaite-Vilkonciene, I. Modification of the AFM Sensor by a Precisely Regulated Air Stream to Increase Imaging Speed and Accuracy in the Contact Mode. Sensors 2018, 18, 2694.
Series/Report no.: 18;8
Abstract: Increasing the imaging rate of atomic force microscopy (AFM) without impairing of the imaging quality is a challenging task, since the increase in the scanning speed leads to a number of artifacts related to the limited mechanical bandwidth of the AFM components. One of these artifacts is the loss of contact between the probe tip and the sample. We propose to apply an additional nonlinear force on the upper surface of a cantilever, which will help to keep the tip and surface in contact. In practice, this force can be produced by the precisely regulated airflow. Such an improvement affects the AFM system dynamics, which were evaluated using a mathematical model that is presented in this paper. The model defines the relationships between the additional nonlinear force, the pressure of the applied air stream, and the initial air gap between the upper surface of the cantilever and the end of the air duct. It was found that the nonlinear force created by the stream of compressed air (aerodynamic force) prevents the contact loss caused by the high scanning speed or the higher surface roughness, thus maintaining stable contact between the probe and the surface. This improvement allows us to effectively increase the scanning speed by at least 10 times using a soft (spring constant of 0.2 N/m) cantilever by applying the air pressure of 40 Pa. If a stiff cantilever (spring constant of 40 N/m) is used, the potential of vertical deviation improvement is twice is large. This method is suitable for use with different types of AFM sensors and it can be implemented practically without essential changes in AFM sensor design.
Description: This article belongs to the Section Physical Sensors
URI: http://dspace.vgtu.lt/handle/1/3861
ISSN: 1424-8220
Appears in Collections:Moksliniai straipsniai / Research articles

Files in This Item:

File Description SizeFormat
Modification of the AFM Sensor by a Precisely Regulated Air Stream to Increase Imaging Speed and Accuracy in the Contact Mode.pdf5.1 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback