Article
Mechanics
P. Yudin, K. Okamoto, T. Yamada, M. Tyunina
Summary: Advanced micro-and nano-electro-mechanical systems benefit from single-crystal-type epitaxial piezoelectric films, which have excellent performance due to their high crystal quality. In these films, strong mechanical coupling to non-piezoelectric substrates causes a difference in their operation compared to purely piezoelectric materials. We consider a general case where bending of the substrate is caused by the converse piezoelectric effect in the film. We provide a thermodynamic description and analytical expressions for curvature, stress release, and thickness changes in a stack of the parallel-plate thin-film capacitor coherent to the substrate, and discuss the implications for interferometric measurement of the converse piezoelectric response.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Xin Liang, Changan Wang
Summary: Strain has a significant influence on the lattice dynamics of crystalline solids. The lattice thermal conductivity of piezoelectric material PbTiO3 shows an unusual behavior under uniaxial strain along the c-axis, with a peak at the unstrained state. This is due to the competing effects of electrical polarization and elastic stiffness on the phonon velocity.
Review
Chemistry, Physical
Cheng Hu, Hongwei Huang
Summary: Semiconductor-based photocatalysis is an efficient technology for reducing energy consumption and environmental pollution, but charge recombination limits its efficiency. Piezo-photocatalysis, by coupling the piezoelectric effect with photoexcitation, can modulate charge carrier dynamics and improve catalytic energy conversion efficiency. This study introduces the mechanism and enhancement strategies of piezo-photocatalysis and reviews recent advances in energy applications. It also analyzes the challenges in the development of piezo-photocatalysis.
ACTA PHYSICO-CHIMICA SINICA
(2023)
Article
Physics, Applied
Minghao Zhao, Jianan Niu, Chunsheng Lu, Bingbing Wang, Cuiying Fan
Summary: The governing equation of a piezoelectric semiconductor (PSC) considering flexoelectricity and the strain gradient effect is derived in this paper. Theoretical analysis is carried out for a cantilever PSC nanowire subjected to a time-harmonic transverse shear force, revealing that the strain gradient effect has a greater impact on the natural frequency and stiffness of the nanowire compared to flexoelectricity. Conversely, flexoelectricity has a stronger influence on electric potential and carrier concentration. These findings provide insights for the design and optimization of PSC devices such as nanoscale energy harvesters.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Yecheng Ding, Xuefeng Zhao, Zeen Zhao, Yaojin Wang, Tom Wu, Guoliang Yuan, Jun-Ming Liu
Summary: Lead halide perovskite materials, such as MAPbBr3 and MAPbI3, have excellent semiconductor properties and are highly promising for applications in solar cells and photodetectors. This study demonstrates that periodic strain can manipulate the built-in electric field, leading to increased short-circuit current and open-circuit voltage. Additionally, the study suggests the potential of using piezoelectric effects for multifunctional sensing, enabling measurements of light intensity, dynamic pressure, and acceleration simultaneously.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Thermodynamics
Arun Ravi Varma, Umair Ahmed, Markus Klein, Nilanjan Chakraborty
Summary: The relationship between turbulent burning velocity, bending effect, and flame surface area is discussed, along with the effects of tangential strain rate, normal strain rate, displacement speed, and curvature.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Electrical & Electronic
Xiangyu Gao, Jinfeng Liu, Benjian Xin, Haonan Jin, Lichen Luo, Jingyu Guo, Shuxiang Dong, Zhuo Xu, Fei Li
Summary: This study presents a bending-bending mode piezoelectric actuator based on PIN-PMN-PT single crystals, featuring ultrahigh piezoelectric coefficient and lower driving voltage requirements, suitable for low-voltage precise actuation applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Physics, Multidisciplinary
Makoto Ashino, Keita Nishioka, Keiji Hayashi, Roland Wiesendanger
Summary: The mechanical behavior of atomically thin membranes is influenced by bending rigidity and Gaussian modulus, but these parameters have not been sufficiently investigated due to methodological drawbacks. This study used atomic force microscopy to extract bending rigidity and reveal Gaussian modulus through tip-induced topological defects. The findings have significance for developing two-dimensional materials and understanding cell biology.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Industrial
V Lafile, B. Galpin, L. Maheo, Cc Roth, V Grolleau
Summary: The bulge test is a vital tool for calibrating sheet metal hardening and anisotropic constitutive models, and has been significantly improved through the use of Digital Image Correlation in recent studies. A numerical study covering a wide range of specimen material behaviors and bulge geometries was conducted to overcome the need for large bulge diameter to sheet thickness ratios.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Dongze Yan, Jianxiang Wang, Jinwu Xiang, Yufeng Xing, Li-Hua Shao
Summary: All dielectric materials have flexoelectricity, but its effect is weak in solids. By using a composite foam based on PDMS and CCTO nanoparticles, an ultrahigh flexoelectric effect has been achieved. The flexoelectricity of the foam exceeds that of the solid matrix by more than 10,000 times, resulting in a density-specific equivalent piezoelectric coefficient 120 times that of PZT. The flexoelectricity output remains stable in 1,000,000 deformation cycles and can power LEDs and charge mobile phones and Bluetooth headsets.
Article
Chemistry, Analytical
Yonggang Liu, Shuliang Zhang, Aoke Zeng, Pengfei Yan
Summary: This paper presents a new type of actuator that integrates IDEs into a conventional piezoelectric sheet, increasing the strain by adjusting the width of electrodes and the gap. Experimental results show that the optimum polarization conditions are 800V, 60 minutes, and 150 degrees Celsius, and the strain of the IDEs piezoelectric actuator is 1.87 times that of the conventional piezoelectric actuator.
Article
Materials Science, Multidisciplinary
A. M. Smirnov, A. V. Kremleva, A. . Yu. Ivanov, A. V. Myasoedov, L. A. Sokura, D. A. Kirilenko, Sh. Sh. Sharofidinov, A. E. Romanov
Summary: This study presents the experimental data on orientation relationships for HVPE-grown K-Ga2O3 film on a-Al2O3 substrate and the theoretical model describing growth orientation dependences of stress-strain state and piezoelectric polarization in K-(AlxGa1-x)2O3 films with orthorhombic crystal structure grown on a-Al2O3 and K-Al2O3 substrates. Two possibilities for variation in films growth orientation for K-Ga2O3/a-Al2O3 and K-(AlxGa1-x)2O3/K-Al2O3 heterostructures are considered. The changes in elastic strain field and piezoelectric polarization in the film caused by differences in values of lattice parameters, elastic, and piezoelectric constants are demonstrated. Growth planes for K-Ga2O3/a-Al2O3 and K-(AlxGa1-x)2O3/K-Al2O3 heterostructures with low internal stresses and low or zero values of piezoelectric polarization are found.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Jacek Widlaszewski, Zdzislaw Nowak, Piotr Kurp
Summary: This study quantitatively describes the bending deformation induced by concurrent laser heating and mechanical loading, and identifies the contribution of a relatively less known mechanism of laser thermal bending in the hybrid process.
Article
Automation & Control Systems
Shijing Zhang, Hongfei Zhao, Xuefeng Ma, Jie Deng, Yingxiang Liu
Summary: This article proposes a three degrees of freedom (3-DOF) piezoelectric micromanipulator (PEMMR) based on the symmetric and antisymmetric bending of a cross-shaped beam. Instead of using piezoelectric stack actuators (PSAs) and flexible mechanisms, this article uses eight piezoelectric ceramic plates to achieve 3-DOF motions, overcoming the disadvantages of complex structure and high cost. The prototype achieves a small operating range, high displacement resolution, and output force, successfully verifying the design and analysis. The PEMMR has a low static capacitance and demonstrates potential in non-contact posture adjustment of microspheres in liquid.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Weimin Dong, Yingjie Sun, Biao Wang, Mengqi Zhu, Jing Li, Xinguang Xu, Jiyang Wang
Summary: The borate piezoelectric crystal BTBO was grown successfully using the TSSG method. It exhibits high longitudinal piezoelectric coefficient and resistivity, as well as good piezoelectric temperature stability, making it a potential candidate for piezoelectric applications.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Khaled M. Chahrour, Poh Choon Ooi, A. M. Eid, Ahmed Abdel Nazeer, Metwally Madkour, Chang Fu Dee, M. F. Mohd Razip Wee, Azrul Azlan Hamzah
Summary: The introduction of crystalline phase change and Ti3+ self-doping improved the electronic conductivity and photoelectrochemical activity of anodic TiO2 nanotubes, enhancing the detection efficiency and selectivity of photoelectrochemical sensors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Shaikh Muhammad Jahanzaib, Abdul O. Jalil, Samson Aisida, Zhao Tingkai, Chang-Fu Dee, Michael Sorokin, Ishaq Ahmad, Anwar Ul-Hamid
Summary: The radiation-induced damage in graphene irradiated with 8-MeV Cu2+ ions at varying fluences was studied, showing an increase in point defects with ion fluence. The metallic nature of graphene was observed to transform into semiconducting at a critical stage, leading to a total conversion of the structure into a massively disordered layer with decreased optical absorption. Density function theory calculations supported the experimental results obtained from the study.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Le Trung Hieu, Chung-Han Chiang, Deepak Anandan, Chang-Fu Dee, Azrul Azlan Hamzah, Ching-Ting Lee, Chung-Hsiung Lin, Edward Yi Chang
Summary: The electrical and thermal characteristics of AlGaN/GaN HEMT heterostructures grown on different substrates were investigated. It was found that the structure grown on SOI substrate exhibited better performance, with improved thermal-sensitive strain and reduced defect density, leading to enhanced temperature-dependence of the device.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yi Sheng Ng, Zhi Yong Yau, Poh Choon Ooi, Rahmat Zaki Auliya, Thiresamary Kurian, Mengying Xie, Sin Tee Tan, Yew Hoong Wong, Muhammad Aniq Shazni Mohammad Haniff, Wee Chen Gan, Chun Hui Tan, Sameer Al-Bati, Khatatbeh Ibtehaj, Azrul Azlan Hamzah, Chang Fu Dee
Summary: This study finds that the choice of electrode materials has an insignificant impact on the electrical output performance of PVDF-based PENGs. However, tuning the PVDF impedance by introducing 2D MXene nanofillers could be a useful approach to improve the performance.
SOLID-STATE ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Xia-Xi Zheng, Chun Wang, Jian-Hao Huang, Jen-Yao Huang, Daisuke Ueda, Krishna Pande, Chang Fu Dee, Ching Ting Lee, Edward-Yi Chang
Summary: This paper investigates the influence of group-III precursor injection rate on the material and electrical properties of InAlGaN/GaN heterostructures grown by Metalorganic Chemical Vapor Phase Deposition. It is demonstrated that high-quality GaN layers can be achieved by using the sputtered AlN/sapphire templates and optimized group-III injection rate, while maintaining high crystallinity and smooth surface of InAlGaN barrier layer.
Article
Materials Science, Multidisciplinary
Ping-Yu Tsai, Hoang-Tan-Ngoc Nguyen, Venkatesan Nagarajan, Chun-Hsiung Lin, Chang-Fu Dee, Shih-Chen Chen, Hao-Chung Kuo, Ching-Ting Lee, Edward Yi Chang
Summary: A high frequency enhancement mode quaternary InAlGaN/GaN MIS-HEMT with a recessed gate was fabricated using an oxygen-based digital etching technique. The threshold voltage of the device can be adjusted over a wide range using the digital etching technique, and the etch rate can be controlled with high flexibility. The fabricated device exhibits high performance.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Biomaterials
P. C. Sivanathan, Kai Shen Ooi, Muhammad Aniq Shazni Mohammad Haniff, Mohsen Ahmadipour, Chang Fu Dee, Norfilza Mohd Mokhtar, Azrul Azlan Hamzah, Edward Y. Chang
Summary: Beta-2-microglobulin (beta M-2) is widely used to detect and evaluate various diseases due to its important role in the human immune system and kidney function. Recent studies have shown that biosensors can be used for simple, rapid, and reliable quantification of beta M-2, overcoming the limitations of sophisticated detection methods.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2022)
Review
Engineering, Electrical & Electronic
Mohsen Ahmadipour, Ai Ling Pang, Mohammad Rezaei Ardani, Swee-Yong Pung, Poh Choon Ooi, Azrul Azlan Hamzah, M. F. Mohd Razip Wee, Muhammad Aniq Shazni Mohammad Haniff, Chang Fu Dee, Ebrahim Mahmoudi, Agus Arsad, Muhammad Zamharir Ahmad, Ujjwal Pal, Khaled M. Chahrour, Seyyed Arash Haddadi
Summary: Currently, analyzing the acetone concentration in exhaled breath has become an appealing and non-invasive approach for detecting diabetes mellitus. With the advancements in gas sensors, this method shows potential for clinical applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Coatings & Films
Tsu-Ting Lee, Kashi Chiranjeevulu, Sireesha Pedaballi, Daire Cott, Annelies Delabie, Chang-Fu Dee, Edward Yi Chang
Summary: In this study, the nucleation, growth, and development of Al2O3 atomic layer deposition (ALD) on a polycrystalline WS2 monolayer created by metal-organic chemical vapor deposition (MOCVD) were investigated. The results provide insights into the intrinsic reactivity of WS2 and the influence of ALD on the growth of WS2, which are crucial for further exploration of the structure and properties of TMD monolayers.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Engineering, Electrical & Electronic
Ping-Hsun Lee, Yueh-Chin Lin, Heng-Tung Hsu, Yi-Fan Tsao, Chang-Fu Dee, Pin Su, Edward Yi Chang
Summary: In this study, tall-gate-stem structures were used to improve the power performance of AlGaN/GaN HEMTs in the Ka-band. A film thinning process was also adopted to reduce parasitic capacitance. The results showed that devices with tall-gate-stem structures and film thinning process had higher cut-off frequency and maximum oscillation frequency values with lower parasitic capacitance. Load-pull measurement results demonstrated improved output power density and power added efficiency for the AlGaN/GaN HEMT with a tall gate stem at Ka-band.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2023)
Article
Chemistry, Analytical
Muhammad Musoddiq Jaafar, Mohd Farhanulhakim Mohd Razip Wee, Hoang-Tan-Ngoc Nguyen, Le Trung Hieu, Rahul Rai, Ashish Kumar Sahoo, Chang Fu Dee, Edward Yi Chang, Burhanuddin Yeop Majlis, Clarence Augustine T. H. Tee
Summary: This study investigated the effect of a titanium/gold guiding layer on the surface acoustic wave propagation of GaN/sapphire substrate. It was found that the guiding layer could transform the propagation modes, act as a sensing layer for biomolecule binding, and influence the output signal in terms of frequency or velocity. The GaN/sapphire device integrated with a guiding layer could potentially be used as a biosensor and in wireless telecommunication applications.
Article
Chemistry, Physical
Nurul Ellena Abdul Razak, Chang Fu Dee, Morgan Madhuku, Ishaq Ahmad, Edward Yi Chang, Hung Wei Yu, Burhanuddin Yeop Majlis, Dilla Duryha Berhanuddin
Summary: The study shows that the luminescence at silicon band edge is greatly enhanced when co-implanted with boron and carbon. The role of boron in band edge emissions in silicon was investigated by introducing defects into the lattice structures. The aim was to increase the light emission intensity from silicon by boron implantation, resulting in the formation of dislocation loops. Photoluminescence measurements were performed to observe the emissions in the near-infrared region. Two main peaks were observed at approximately 1112 and 1170 nm in the samples incorporated with boron, with significantly higher intensities compared to pristine silicon samples.
Article
Chemistry, Analytical
Anis Amirah Alim, Roharsyafinaz Roslan, Sh. Nadzirah, Lina Khalida Saidi, P. Susthitha Menon, Ismail Aziah, Dee Chang Fu, Siti Aishah Sulaiman, Nor Azian Abdul Murad, Azrul Azlan Hamzah
Summary: This study focuses on the performance of a graphene-based field-effect transistor (FET) as a biosensor. A top-gate FET with a titanium dioxide-reduced graphene oxide (TiO2-rGO) nanocomposite as the transducer material was developed using the finite element method. Taguchi mixed-level method was used to design 18 3D models, investigating the effects of various factors on the device performance. The results showed that the channel length had the most significant impact on the drain current (I-d) value.
Article
Engineering, Electrical & Electronic
Ming-Wen Lee, Yueh-Chin Lin, Po-Sheng Chang, Yi-Fan Tsao, Heng-Tung Hsu, Chang-Fu Dee, Edward Yi Chang
Summary: This study presents the fabrication of AlGaN/GaN high-electron-mobility transistors (HEMTs) using Stepper Lithography on a 4-inch wafer for Ka-Band applications. A small gate length of 100 nm was achieved through a 2-Step Photolithography Process, and the gate region of the AlGaN/GaN HEMT was defined using two lithography steps to form gamma-shaped gates. The results demonstrate high electrical performance uniformity and excellent RF performance, indicating the potential of AlGaN/GaN HEMT fabrication with high yield for 5G applications using Stepper Lithography.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Khaled M. Chahrour, Poh Choon Ooi, Ahmed Abdel Nazeer, Latifa A. Al-Hajji, Peverga R. Jubu, Chang Fu Dee, Mohsen Ahmadipour, Azrul Azlan Hamzah
Summary: Highly arranged porous anodic titania nanotube arrays were fabricated through anodization, followed by decoration of CuO/Cu nanoparticles and impregnation into graphene oxide aqueous solution to produce CuO/Cu/GO-ATNT. The resulting CuO/Cu/rGO nanocomposite ATNT electrode showed superior electro-catalytic performance for non-enzymatic glucose sensing. The electrode exhibited high sensitivity, low detection limit, wide linear range, stability, reproducibility, and selectivity. Rating: 9/10.
NEW JOURNAL OF CHEMISTRY
(2023)
