Article
Physics, Fluids & Plasmas
R. Mark Bradley, Patrick D. Shipman
Summary: In this study, the patterns created by scanning an atomic force microscope tip over a polymer surface were investigated using a mesoscopic model. The research discovered that the steady-state solution is only stable below a critical value, beyond which periodic stick-slip motion occurs.
Article
Physics, Applied
Gwangmook Kim, YoungJun Cho, Min-Kyun Cho, Dohun Kim, Wooyoung Shim
Summary: Cantilever-free scanning probe microscopy has potential for high-throughput topography imaging. However, the current imaging mechanism lacks efficiency in detection precision and bandwidth, limiting the application of this measurement system. We present a contact resistance-based imaging system using RF reflectometry, achieving sub-micrometer-scale topography imaging with a resolution of 230 nm and a bandwidth of approximately 8.5 MHz.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Luke Oduor Otieno, Bernard Ouma Alunda, Jaehyun Kim, Yong Joong Lee
Summary: Improving the imaging rate of a high-speed atomic force microscope requires specialized hardware and software, with ongoing efforts to enhance general applications. A compact HS-AFM scan-head design with minimal Z-scanner loading is presented in this study as an efficient solution for faster imaging.
Article
Chemistry, Multidisciplinary
Genwang Wang, Ye Ding, Haotian Long, Yanchao Guan, Xiwen Lu, Yang Wang, Lijun Yang
Summary: This paper reports on the simulations of electric and force fields at the tips of metallic probes irradiated by polarized laser output from a scanning near-field optical microscope probe. The results demonstrate that polarized laser can induce nanoscale evanescent fields with high intensity, which effectively move nanoparticles. The paper also discusses schemes with dual probes, showing that different combinations of metallic probes and polarized lasers provide diverse near-field and corresponding optical force.
APPLIED SCIENCES-BASEL
(2022)
Article
Food Science & Technology
Xia Gao, Shengnan Yang, Juan You, Tao Yin, Shanbai Xiong, Ru Liu
Summary: This study investigated the effect of high intensity ultrasound (HIU) and NaCl on the physicochemical properties of myosin. It was found that the combination of HIU and NaCl improved the solubility and stability of myosin, resulting in the formation of denser microstructures. This led to enhanced gelation properties and water holding capacity of myosin gels.
Article
Physics, Fluids & Plasmas
Pedro J. Martinez, Enrico Gnecco, Juan J. Mazo
Summary: This study investigates the quantifiable characteristics of wave-like features observed on polymer surfaces when examined with AFM, and demonstrates the presence of ripples and dotted regions under different parameter values. The amplitude, period, and orientation of these features are numerically estimated, revealing a cooperative process involving the scanning of multiple lines leading to the emergence of ripples.
Article
Engineering, Chemical
Chenwei Li, Yating Zhang, Haijun Zhang
Summary: Nanobubbles on the solid surface play a crucial role in the removal of fine coal/minerals from slurry. This study investigates the nucleation process of surface nanobubbles and its effect on particle interaction. The findings reveal that surface hydrophobicity is more important than surface roughness in nanobubbles nucleation. The presence of nanobubbles enhances adhesion force and collision probability, leading to improved removal efficiency in flotation techniques.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
Weina Zhang, Hongxiang Lei, Liyun Zhong, Wenjie Liu, Juan Li, Yuwen Qin
Summary: Optical manipulation of metal nanowires is crucial for optoelectronic nanosystems, but their strong absorption or scattering properties pose challenges. In this study, precise manipulation of a single Ag nanowire was achieved using an optical scattering force. The forces and torques exerted on the nanowire were analyzed and quantitatively calculated, providing insights into the manipulation mechanism. This scattering-force-based method is stable and applicable for nontransparent structures.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Seyede Zahra Mohammadi, Hossein Nejat Pishkenari, Majid Mohammadi Moghaddam, Mohammadreza Sajjadi
Summary: The study introduced a novel strategy based on particle motion mode to control the manipulation process of bio-particles using an atomic force microscope. The control equations consider 6 degrees of freedom, and the manipulation process includes sticking and sliding phases. A simple proportional controller was shown to be able to safely steer particles to their target point without any overshoot.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Review
Chemistry, Physical
Andrius Dzedzickis, Juste Rozene, Vytautas Bucinskas, Darius Virzonis, Inga Morkvenaite-Vilkonciene
Summary: This paper provides a systematic review of atomic force microscopy (AFM), focusing on analyzing the available technical solutions and design of different parts, particularly the cantilever. Many recent scientific articles propose innovative AFM control and imaging algorithms, some of which are based on artificial intelligence.
Article
Physics, Applied
D. F. S. Costa, J. L. B. de Araujo, C. L. N. Oliveira, J. S. de Sousa
Summary: This work presents an analytical model for describing atomic force microscopy force curves of standard linear solid and power-law viscoelastic materials, considering the effects of indenter geometry and finite thickness. It is found that conical/pyramidal cantilevers are less affected by finite thickness effects compared to other shapes, such as spherical and flat punch indenters. Finite element modeling of the stress field distribution within the sample confirms this. The study also analyzes systematic errors when analyzing finite thickness samples with an infinite thickness force model, showing that for spherical indenters and indentation depths up to 20% of sample thickness, the mechanical response of viscoelastic materials will inaccurately resemble purely elastic behavior, even within timescales where viscoelastic relaxation should occur.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Xuanyu Huang, Xiaojian Xiang, Jinghui Nie, Deli Peng, Fuwei Yang, Zhanghui Wu, Haiyang Jiang, Zhiping Xu, Quanshui Zheng
Summary: The article introduces a microscale generator - the Schottky superlubric generator (S-SLG), which can generate high current and power densities while maintaining stable high electrical current density over a long lifetime. Experimental results demonstrate the enduring and virtually unlimited persistence of the S-SLG.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
N. Makarova, I Sokolov
Summary: The brush model provides a consistent interpretation of AFM indentation data by considering a non-Hertzian deformation of the pericellular brush-like layer and provides a less depth-dependent measurement of the effective Young's modulus of the cell body. The model is robust and the errors due to uncertainties in the model and experimental data are within 4%.
Article
Materials Science, Multidisciplinary
Aleksandra Misovic, Danica Bajuk Bogdanovic, Dejan Kepic, Vladimir Pavlovic, Miroslav Huskic, Navid Hasheminejad, Cedric Vuye, Nemanja Zoric, Svetlana Jovanovic
Summary: The study synthesized graphene oxide and silver nanowires to create chemically stable composites with improved electrical properties. Increasing the mass ratio of silver nanowires to graphene oxide resulted in improved surface quality of the composite film and decreased sheet resistance. Additionally, the effects of gamma irradiation on the structure of the composites were studied for the first time at doses of 15, 25, and 35 kGy.
Article
Chemistry, Multidisciplinary
Sy Hieu Pham, Anthony Ferri, Antonio Da Costa, M. M. Saj Mohan, Van Dang Tran, Duy Cuong Nguyen, Pascal Viville, Roberto Lazzaroni, Rachel Desfeux, Philippe Leclere
Summary: This study reports the high performance of transparent conductive electrodes (TCEs) based on silver nanowires (AgNWs) percolation networks. By optimizing the deposition conditions, AgNWs exhibit low sheet resistance and high optical transmittance. Conductive atomic force microscopy measurements reveal low resistivity of individual AgNWs and high current levels within the network. Thin-film electrodes based on AgNWs show great potential for future flexible electronic devices.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Xinli Ma, Jing Zhang, Jiawei Lai, Mingwen Zhang, Jingchuan Zheng, Sen Wu, Xiaodong Hu, Qinsheng Wang, Xuetao Gan, Dong Sun, Jing Liu
Summary: This study introduces Re doping to produce monolayer MoS2 with valley degree of freedom and anisotropy, achieving improved electrical and optoelectrical performances. The anisotropic optical response of Re-doped MoS2 increases with Re concentration, indicating promising potential for developing polarization sensitive valleytronic devices. The anisotropic response is attributed to strain induced by dopants, preserving optical helicity dependent valley selection rules in the 2H lattice structure.
Article
Automation & Control Systems
Fan Feng, Xin Zhang, Junming Zhang, Hoay Beng Gooi
Summary: This article proposes two impedance compensation methods to enhance the stability of the dual active bridge (DAB) converter-based energy storage systems (ESSs): optimizing the DAB feedback controller design and proposing a family of impedance shaping regulators. The effectiveness of these methods is validated through experimental results, showing improved stability of DAB-based ESSs.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Li Liu, Jiupeng Wu, Hongyi Xu, Zhengyun Zhu, Na Ren, Qing Guo, Junming Zhang, Kuang Sheng
Summary: This study investigates and compares the characteristics and ruggedness of SiC MPS diodes with hexagonal and circular cell designs, and finds that the circular cell design brings better performance and ruggedness.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Nanoscience & Nanotechnology
Guangyu Geng, Enxiu Wu, Linyan Xu, Xiaodong Hu, Xiaopu Miao, Jing Zou, Sen Wu, Jing Liu, Yang Liu, Zhongdu He
Summary: This study develops a method to manipulate the dielectric properties of two-dimensional boron nitride (h-BN) through ion implantation and successfully constructs MoTe2 heterojunction by controlling the dielectric properties of h-BN. By modulating the dielectric properties of h-BN, stable anti-ambipolar behavior can be achieved, and a ternary inverter based on anti-ambipolar transistor has been preliminarily implemented.
Article
Engineering, Electrical & Electronic
Yuxin Feng, Shuai Shao, Jiakun Du, Qian Chen, Junming Zhang, Xinke Wu
Summary: This study proposes a short-circuit and over-current fault detection solution based on TMR technology, which can non-invasively measure the current of SiC MOSFET modules and detect faults by comparing the measured current with a threshold. Experimental results demonstrate the superior performance of this method in fault detection.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Instruments & Instrumentation
Nianhang Lu, Shasha Xiao, Rui Zhang, Jirui Liu, Long Ma, Sen Wu
Summary: This paper presents a novel thin head atomic force microscope (AFM) that can be easily integrated with an upright optical microscope (OM). By using an obliquely incident laser beam, the effective thickness of the AFM head is reduced, allowing the accommodation of an objective lens without obstruction. In addition, a multi-function digital controller was developed to control the AFM and communicate with the OM.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Engineering, Electrical & Electronic
Zhi Gao, Shuai Shao, Wentao Cui, Junming Zhang, Xiangrong Chen, Kuang Sheng
Summary: This article proposes a voltage balancing technique for series-connected power devices in voltage source converters, which achieves voltage sharing among devices by balancing the capacitor voltages in the active clamping module. The method shows good balancing performance, scalability, and low power losses.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yang He, Xun Wang, Shuai Shao, Junming Zhang
Summary: In this article, a dynamic current balancing method based on a new active gate driver (AGD) is proposed to improve current sharing in parallel applications. The AGD adjusts the gate drive current of SiC mosfets by di/dt feedback control and voltage controlled current source, changing the switching trajectory to achieve current balance. The proposed AGD can be easily used for multiple paralleled devices using a master-slave control strategy. Experimental results show that the proposed AGD effectively reduces the turn-on and turn-off switching energy imbalances in paralleled devices.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yang He, Junming Zhang, Shuai Shao
Summary: This article presents a symmetric power circuit layout based on decoupled paralleled modular switching cells (MSCs) to address the current imbalance issue in the parallel connection of silicon carbide metal-oxide-semiconductor transistors. By explaining the current sharing mechanisms of typical asymmetric power circuit layouts, it is found that the layout with distributed dc decoupling capacitors has the potential to modify the current paths. The construction of the symmetric layout with MSCs concept is elaborated through mathematical analysis, and experiments validate the effectiveness of the decoupled MSCs method in reducing peak current imbalance to only 4.1%.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Mechanical
Yifu Wan, Tong Guo, Sen Wu, Xinyu An
Summary: In this study, a four-axis measurement system is developed and a tilt scanning measurement method using a chromatic confocal sensor is proposed to measure curved surfaces. The measurement area is divided into different parts, and the proposed method greatly expands the measurement range. The effectiveness of the developed measurement system and the tilt scanning measurement method is clearly verified by measuring a spherical specimen with a radius of 50 mm.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Engineering, Electrical & Electronic
Lyuyi Lin, Junming Zhang, Shuai Shao
Summary: This article proposes a variable switching frequency (VSF) multimode control scheme to optimize the device losses at each operating point for a single-phase T-type hybrid-bridge inverter. The scheme is designed based on V-I plane analysis and can be applied in both unity power factor (PF) and nonunity PF operations. Experimental results show that the proposed optimal VSF scheme can achieve higher efficiency than the conventional constant switching frequency (CSF) scheme over a wide power range.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Hui Chen, Weicong Lin, Shuai Shao, Xinke Wu, Junming Zhang
Summary: This article introduces the tunnel magnetoresistance (TMR) as a promising current sensor due to its high sensitivity, low power consumption, small footprint, and noninvasive measurement. However, voltage spikes and gain variations in the TMR sensor output caused by fast voltage commutations and skin effect in high-frequency power converters are addressed. A comb-shaped shield is proposed to reduce output spikes, and the optimal shield parameters are determined. The optimal mounting position of TMR for different widths of printed circuit board (PCB) tracks is also identified. The proposed methods ensure TMR current measurement accuracy across a wide switching frequency range.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Baixun Zheng, Yuecai Fang, Guangyao Zhang, Junming Zhang
Summary: This paper designs and builds a short-circuit test platform for SiC MOSFETs to investigate the relationship between gate voltage, short-circuit withstand time, and short-circuit peak current overshoot. Based on the test results, a short-circuit protection scheme with a soft turn-off circuit is proposed, which can achieve fast short-circuit protection response and reduce fault peak current.
2022 19TH CHINA INTERNATIONAL FORUM ON SOLID STATE LIGHTING & 2022 8TH INTERNATIONAL FORUM ON WIDE BANDGAP SEMICONDUCTORS, SSLCHINA: IFWS
(2022)
Proceedings Paper
Automation & Control Systems
Weicong Lin, Shuai Shao, Junming Zhang
Summary: This paper uses tunnel magnetoresistance (TMR) to non-invasively measure the current in high frequency power converters, discussing the impact of skin effect and providing an empirical formula for optimal sensor placement. Experimental results show that placing the TMR sensor at the optimal location significantly reduces measurement delay. A comb-shaped shield is also proposed to suppress output spikes caused by common mode noise.
IECON 2021 - 47TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Huitian Bai, Sen Wu
Summary: This paper presents an autodetection method for flexible nanowires using a deep learning technique, utilizing YOLOv3 and FCN networks to segment nanowires in AFM images, followed by algorithms for posture and position detection, achieving high accuracy. The algorithm demonstrates over 90% reliability in the testing dataset and shows good robustness with minimal impact from image complexity.
NANOTECHNOLOGY AND PRECISION ENGINEERING
(2021)
