Balantekin, Müjdat
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Balantekin, Mujdat
Balantekin, M
Balantekin, M.
Balantekin, M
Balantekin, M.
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Email Address
mujdatbalantekin@iyte.edu.tr
Main Affiliation
03.05. Department of Electrical and Electronics Engineering
Status
Former Staff
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1NO POVERTY
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
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7AFFORDABLE AND CLEAN ENERGY
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
2
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10REDUCED INEQUALITIES
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Documents
25
Citations
359
h-index
11
Documents
24
Citations
299
Scholarly Output
7
Articles
3
Views / Downloads
5744/3296
Supervised MSc Theses
3
Supervised PhD Theses
0
WoS Citation Count
11
Scopus Citation Count
13
Patents
0
Projects
3
WoS Citations per Publication
1.57
Scopus Citations per Publication
1.86
Open Access Source
7
Supervised Theses
3
| Journal | Count |
|---|---|
| Measurement Science and Technology | 1 |
| Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites - 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013 | 1 |
| Review of Scientific Instruments | 1 |
| Ultramicroscopy | 1 |
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7 results
Scholarly Output Search Results
Now showing 1 - 7 of 7
Master Thesis Graphene Transfer Approaches With Different Support Materials on the Substrates With Cavities(Izmir Institute of Technology, 2019) Duman, Sinem; Balantekin, Müjdat; Çelebi, CemA micro capacitive sensor characteristically embraces a thin conductive membrane which is freely suspended above an immovable counter electrode in a parallel plate geometry. Such capacitive structures are found in broad range of applications as a transducer like capacitive micro-machined ultrasonic transducer (CMUT), pressure sensor, resonator and biological or chemical material sensing element. The input can be an ultrasound wave, pressure, chemical or biological mass attachment which result in the deflection of the membrane. Emerging nano materials have shown great potential as candidates for generation of nano and micro electromechanical systems (NEMS, MEMS). Among these nano materials, graphene is regarded as a promising material because of its ultra low mass, thickness, high surface to volume ratio, flexibility, and extraordinary electrical and mechanical properties. However, the transfer of graphene on substrates with micro scale cavities is challenging since the fabrication of large area membranes with a smaller air gap often results in membrane tearing or collapse driven by capillary or electrostatic forces. This study presents a research on the fabrication and the characterization of graphene membranes to be used in micro capacitive sensor applications. Substrates which span a large array of circular and hexagonal micro cavities between 2-100 μm in diameter are fabricated. Graphene transfer with different support materials are studied to fabricate graphene micro membranes. Up to 5 μm diameter membranes on 300 nm deep cavities are demonstrated via scanning electron microscope (SEM) and atomic force microscope (AFM) tools.Conference Object High-Speed Imaging in Noncontact Atomic Force Microscopy(CRC Press, 2013) Balantekin, MüjdatWe analyze the high-speed operating method that we recently developed to be used in noncontact atomic force microscopes (AFM). We simulated the method on various samples and it is shown that the method can minimize the time spent for noncontact AFM imaging experiments. The initial simulation results showed that even with an ordinary AFM cantilever imaging speeds faster than 10 frames/second can be achieved.Master Thesis Nonlinear Controller Design for High Speed Dynamic Atomic Force Microscope System(Izmir Institute of Technology, 2018) Coşar, Alper; Balantekin, MüjdatIn this study, the performances of conventionally used PI controller and a nonlinear H∞ controller, are compared in the state-of-the-art High-Speed Dynamic Atomic Force Microscope (HS-AFM). The state-of-the-art HS-AFM system is modeled via MATLAB/ SIMULINK for four different cantilevers, i.e., small high-frequency and regular lowfrequency cantilevers used in air and liquid environments. For the modeled system, PI and H∞ controllers are designed and implemented by using both analytical methods and toolboxes available in MATLAB. Simulations are performed in ideal condition, and under exogenous effects such as noise, disturbance and parametric uncertainty. In ideal condition, achieved maximum frame rate, and the percentage of topography acquisition error with two controllers are calculated for each cantilever. Also, performances of controllers in the system are tested under exogenous effects. It is observed that with the H∞ controller, the topography of the selected sample can be obtained with up to 2 times less acquisition error. It is also observed that PI controller is better in disturbance rejection, but H∞ controller is more robust under the effect of noise. For each cantilever, similar results to the ideal condition is obtained in case of uncertainty. Most distinctive results are obtained with high-frequency cantilevers, as H∞ controller enables a 2 times higher frame rate (14.3 fps) compared to the PI controller (7.1 fps) with the same level of acquisition error in the state-of-the-art HS-AFM operated in liquid environment.Article Citation - WoS: 3Citation - Scopus: 3High-Speed Tapping-Mode Atomic Force Microscopy Using a Q-Controlled Regular Cantilever Acting as the Actuator: Proof-Of Experiments(American Institute of Physics, 2014) Balantekin, Müjdat; Satır, Sarp; Torello, David; Değertekin, F. L.We present the proof-of-principle experiments of a high-speed actuationmethod to be used in tapping-mode atomic force microscopes (AFM). In this method, we do not employ a piezotube actuator to move the tip or the sample as in conventional AFM systems, but, we utilize a Q-controlled eigenmode of a cantilever to perform the fast actuation. We show that the actuation speed can be increased even with a regular cantilever.Master Thesis Analysis of Cantilevers for High-Speed Atomic Force Microscopy(Izmir Institute of Technology, 2018) Brar, Harpreet Singh; Balantekin, MüjdatIn life sciences, High-Speed Atomic Force Microscopy (HS-AFM) is now widely accepted as a dynamic event visualizer for numerous biological samples such as live cells, membrane lipids, ATP-proteins, enzymatic reactions, DNA-protein interactions, etc. HSAFM’s unique ability to observe surface topography of the samples with height data and with a resolution of up-to a single atom makes it a prominent tool in Nano measurements. HS-AFM Imaging technique’s speed and response is limited by various factors including cantilever probes, operating environment, scanning techniques etc. Cantilevers are indispensable and integral part of HS-AFM Systems, thereby necessitating their own critical evaluations. Therefore, evaluation of various parameters like resonance frequency, stiffness and Q-factor of cantilevers is an active area of research. The simulated research work mimics the experimental conditions of HS-AFM operation in air and liquid environment. The damping mechanisms such as viscous and acoustic damping of the medium, squeeze film damping, and damping due to viscoelasticity of the material are included in the finite element simulations. High frequency soft cantilevers suitable for HS-AFM with the stiffness of ~1 N/m and with the first flexural eigenmode resonance frequency of ~1.5 MHz (in liquid) and ~5 MHz (in air) are studied. Numerous small rectangular and modified cantilevers of Silicon and Polymer (SU-8) materials with the length of ~5 to 10 μm, width of ~1 to 2.5 μm and thickness of ~0.1 to 0.6 μm are analyzed. Our aim in this research is to identify appropriate cantilever geometries and materials for HS-AFM applications.Article Citation - WoS: 5Citation - Scopus: 7High-Speed Dynamic Atomic Force Microscopy by Using a Q-Controlled Cantilever Eigenmode as an Actuator(Elsevier Ltd., 2015) Balantekin, MüjdatWe present a high-speed operating method with feedback to be used in dynamic atomic force microscope (AFM) systems. In this method we do not use an actuator that has to be employed to move the tip or the sample as in conventional AFM setups. Instead, we utilize a Q-controlled eigenmode of an AFM cantilever to perform the function of the actuator. Simulations show that even with an ordinary tapping-mode cantilever, imaging speed can be increased by about 2 orders of magnitude compared to conventional dynamic AFM imaging.Article Citation - WoS: 3Citation - Scopus: 3Manipulating the Frequency Response of Small High-Frequency Atomic Force Microscope Cantilevers(IOP Publishing, 2020) Brar, Harpreet Singh; Balantekin, MüjdatWe study small (less than 10 mu m-long) high-frequency (greater than 1 MHz) cantilevers specially designed for visualization of biomolecular processes in high-speed atomic force microscopes. The frequency responses of the first three flexural eigenmodes are investigated for the modified geometries. It is found that the Q-factors can be significantly altered in the desired way by reengineering the cantilever geometry without affecting its main operational parameters, such as the spring constant and the resonance frequency of the first flexural eigenmode in an air environment. In addition, higher-order flexural resonances can be moved away from the fundamental resonance with these geometrical modifications. The Q-factors in liquid, on the other hand, do not show a significant difference due to high viscous damping of the medium. Regular cantilevers modified by a focused ion beam are used to demonstrate the validity of the finite element simulation model.