Article
Materials Science, Multidisciplinary
Sara Zanchi, Antoine Pascaud, Fabrice Domingues Dos Santos, Sylvie Tence-Girault, Sebastien Roland
Summary: This article studies the electric responsiveness of P(VDF-co-TrFE) copolymer and P(VDF-ter-TrFE-ter-CTFE) terpolymer films in response to an external electric field. Factors such as chemical composition and thermal treatment affect the performance of these electroactive films. The study analyzes the nanoscale response using piezoresponse force microscopy on thin films (~100 nm thick), and the macroscopic response by measuring the electric displacement-electric field loops on thick films (~20 μm thick). The chemical composition (CTFE content) is crucial in defining the electroactive behavior at both scales, while the thermal treatment has a more significant impact at the nanoscale. The orientation, shape, and size of the crystalline lamellae affect the sensitivity of the electric dipoles to the applied electric field, and controlled growth of edge-on lamellar stacks improves the piezoresponse of the film.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Analytical
Sean Toffessi Siewe, Samuel Calle, Francois Vander Meulen, Damien Valente, Jean-Marc Gregoire, Aline Banquart, Stephanie Chevalliot, Arnaud Capri, Franck Levassort
Summary: Tailored backings with high acoustic impedance and strong attenuation are needed for miniaturized high-frequency transducer design. The use of multiphasic metallic backings in this study has shown promising results in terms of sensitivity and bandwidth for imaging applications.
Article
Acoustics
Aline Banquart, Samuel Calle, Jean-Marc Gregoire, Frederic Ossant, Lionel Fritsch, Arnaud Capri, Jean-Marc Inglese, Stephanie Chevalliot, Franck Levassort
Summary: An innovative inkjet printing method was used to deposit P(VDF-TrFE) film on silicon wafers for fabricating a high-frequency annular array prototype. A polymer-based lens with low acoustic attenuation was added to the deposition, and the prototype showed promising electromechanical performance. Dynamic focusing was applied in reception, leading to improved lateral resolution. The next step is to increase the acoustic attenuation in the silicon wafer for a fully operational multielement transducer.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Yi-Jen Huang, Po-Han Hsiao, Chun-Chieh Wang, Chun-Jen Su, Jen-Hao Chang, Yu-Cheng Kuo, Wen-Ching Ko
Summary: Soft piezoelectric composite nanofibers composed of P(VDF-TrFE) and P(VDF-TrFE-CTFE) were prepared by coaxial electrospinning technique. The relationship between crystal structures and piezoelectric responses was investigated. The piezoelectric voltages of the composite nanofibers were approximately 3.0 V and 3.5 V at 10 Hz and 100 Hz, respectively. In-situ WAXS was used to observe the effect of applied voltage on lattice strains in different lattice orientations. Crystallographic studies on the composite nanofibers revealed co-crystallization, which led to higher piezoelectric voltages in the composite nanofibers.
Article
Nanoscience & Nanotechnology
Zulmari Silva Pedraza, Yizhan Wang, Corey Carlos, Zhongmin Tang, Jun Li, Weibo Cai, Xudong Wang
Summary: This study explores the use of piezoelectric microparticles as a method for inducing irreversible electroporation of breast cancer cells. The results show a reduction in cell viability, suggesting that this approach may offer a more benign cancer treatment option.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Tu-Ngoc Lam, Chia-Yin Ma, Po-Han Hsiao, Wen-Ching Ko, Yi-Jen Huang, Soo-Yeol Lee, Jayant Jain, E-Wen Huang
Summary: The coaxial core/shell composite electrospun nanofibers exhibit superior mechanical and electrical properties compared to individual polymers, with enhanced mechanical anisotropy, good strength-ductility balance, and comparable dielectric responses. Additionally, an impressive piezoelectric coefficient is achieved in the composite structure, showcasing the promising approach of coaxial electrospinning in tuning the performance of electroactive polymers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Engineering, Electrical & Electronic
Cheng Fang, Zijie Zhao, Jie Fang, Jun Zou
Summary: This article presents a new optically transparent transducer for photoacoustic microscopy (PAM) using poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) film. The transducer is fabricated using a simplified process based on precutting and direct lamination. Experimental results show that the transducer has good optical transmittance and acoustic performance, making it useful for different imaging applications in PAM systems.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Xinping Hu, Yaping Che, Zijie Zhang, Qun-Dong Shen, Baojin Chu
Summary: Multifunctional materials were achieved by designing composites of P(VDF-TrFE) ferroelectric polymer and BiFeO3-BaTiO3 nanofibers, combining the properties of the polymer and nanofibers to improve dielectric, piezoelectric, and pyroelectric properties, as well as to create multiple functionalities such as ferromagnetism, magnetoelectric effect, photothermal effect, photostriction, and photo-electric response. The composite materials can detect mechanical, magnetic, and optical signals and generate actuation by electrical and optical stimuli.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Energy & Fuels
Jiaheng Nie, Yaming Zhang, Minjiang Dan, Jizheng Wang, Lijie Li, Yan Zhang
Summary: Perovskite solar cells are being studied as a candidate for next-generation solar devices due to their rapid increased power conversion efficiency. Introducing internal polarization by doping P(VDF-TrFE) into perovskite can effectively improve the key characteristics of the solar cell. Experimental results show that this simple polarization method has effectively improved the PCE up to 22.1%.
Article
Polymer Science
Pedro M. Resende, Jean-David Isasa, Georges Hadziioannou, Guillaume Fleury
Summary: This study presents a facile and noninvasive approach to evaluate the relative ratio of defects in TrFE segments through a detailed analysis of polymer Raman spectra. By varying the content of TrFE in P-(VDF-TrFE) samples, the contribution of TrFE unit modes can be determined and validated through other analysis techniques. Based on the findings, a defect quantification ratio is proposed to predict chain conformation and electroactive behavior.
Article
Chemistry, Physical
Pengshan Xie, Yulong Huang, Wei Wang, You Meng, Zhengxun Lai, Fei Wang, SenPo Yip, Xiuming Bu, Weijun Wang, Dengji Li, Jia Sun, Johnny C. Ho
Summary: The research presents InGaAs nanowire artificial synapses wrapped in poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)), capable of operating with record-low subfemtojoule power consumption. By adjusting the thickness of top P(VDF-TrFE) films, essential synaptic behaviors are effectively mimicked and modulated, while long-term depression is realized through visible light application. Combined with optimal P(VDF-TrFE) films, the synaptic devices exhibit more linear characteristics and faster learning processes, demonstrating potential advantages for neuromorphic computing systems.
Article
Engineering, Electrical & Electronic
Zhong Li, Meirong Zhang, Ying Zhang, Tao Lu, Weiwei Zhu, Zhicheng Zhang
Summary: This research explores the energy harvesting performance of poly(vinylidene trifluoroethylene) (P(VDF-TrFE)) films with different chemical compositions and thicknesses. The results show that these films can meet certain power consumption levels and are suitable for self-sustained sensing systems, with tunable system parameters.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Multidisciplinary Sciences
Henrik Staaf, Anurak Sawatdee, Cristina Rusu, David Nilsson, Philipp Schaeffner, Christer Johansson
Summary: The study investigates the magnetoelectric coupling between Metglas films and P(VDF-TrFE), utilizing graphite ink and a noncontact readout method to achieve high magnetoelectric coupling values. 2D laser Doppler vibrometer measurements are applied to reveal the complex vibration patterns resulting in strong resonant response.
SCIENTIFIC REPORTS
(2022)
Article
Polymer Science
Lavanya Muthusamy, Balaadithya Uppalapati, Samee Azad, Manav Bava, Goutam Koley
Summary: Self-polarized energy harvesting materials have gained attention for their simple fabrication method and versatile application potential. In this study, P(VDF-TrFE)/carbon black (CB) composite thin films were investigated, with the increase of CB content resulting in enhanced crystallinity, dipolar orientation, and piezoelectric performance. The surface roughness of the films increased with higher CB content, leading to increasing piezoelectric voltage. However, the maximum value was reached at 0.6 wt.%, after which the sample had low resistance.
Article
Chemistry, Multidisciplinary
Yong Liu, Wei-Guo Liu, Da-Bin Lin, Xiao-Ling Niu, Shun Zhou, Jin Zhang, Shao-Bo Ge, Ye-Chuan Zhu, Xiao Meng, Zhi-Li Chen
Summary: Vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) films are widely used in various applications due to their high electroactive, optical, and nonlinear optical properties. In this study, multilayer structured ultrathin films were fabricated using the Langmuir-Blodgett technique with accurate control over the thickness per layer. The films exhibited high density when the collapse pressure and optimal dipping value of P(VDF-TrFE) (25:75) were 60~70 mN/m and 15 mN/m, respectively. The surface topography and optical properties of the LB films were characterized, showing transparency in the visible and IR regions but high absorption in the UV region. The transmittance of the films ranged from 50% to 85% in the visible region and decreased linearly with the number of monolayers.
Article
Chemistry, Analytical
Anowarul Habib, Sanat Wagle, Adit Decharat, Frank Melandso
Article
Engineering, Electrical & Electronic
Jin-Dong Wang, Jia-Jia Jiang, Fa-Jie Duan, Shuo-Ya Cheng, Cheng-Xiang Peng, Wei Liu, Xing-Hua Qu
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2020)
Article
Instruments & Instrumentation
A. Habib, S. Wagle, A. Decharat, F. Melandso
SMART MATERIALS AND STRUCTURES
(2020)
Article
Engineering, Multidisciplinary
Prakhar Kumar, Nitin Yadav, Muhammad Shamsuzzaman, Krishna Agarwal, Frank Melandso, Anowarul Habib
Summary: Acoustic microscopy has various applications from NDT to medical imaging, where artifacts may appear during scanning, but can be corrected using a novel algorithm for more accurate information and improved image quality.
Article
Physics, Applied
Kaushik Shukla, Azeem Ahmad, Balpreet Singh Ahluwalia, Frank Melandso, Anowarul Habib
Summary: In scanning acoustic microscopy (SAM), the image quality is influenced by factors such as noise level, resolution, and interaction of waves with sample boundaries. Traditional equations for reflection and transmission coefficients fail to accurately describe curved/rough boundaries. In this study, a finite element method-based modeling approach was presented to calculate the loss coefficients in SAM. Calculation of losses based on energy for defining acoustic reflection and transmission losses, as well as their dependence on the radius of curvature of the test object, were also discussed.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Optics
Ke Wang, Chengxiang Peng, Zuoxun Hou
Summary: This study investigates the effect of laser fluence on the dark noise performance of a CMOS image sensor and proposes a short-time etching method to improve its electrical performance while suppressing dark noise and maintaining near-infrared response enhancement.
Article
Microbiology
Chao-Jian Hu, Wen-Dong Xian, Yi-Qing Lv, Cheng-Xiang Peng, Rong-Xu Shan, Ze-Chang Cheng, Qian Lv, Ye Tian, Jian-Yu Jiao, Sha Tan, Wen-Jun Li
Summary: Two closely related moderately thermophilic bacteria, strains SYSU G05006T and SYSU G05005, were isolated from a sample collected from Rehai National Park, Tengchong, Yunnan Province, PR China. They were closely related to Caldovatus sediminis based on the phylogenetic analysis and were described as a new species, Caldovatus aquaticus sp. nov. Strain SYSU G05006T had a genome size of 3.87 Mbp and showed optimal growth at 55 degrees C and pH 6.0.
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
(2022)
Article
Chemistry, Analytical
Abhishek Ranjan, Azeem Ahmad, Balpreet Singh Ahluwalia, Frank Melandso
Summary: This study demonstrates the generation and detection of Scholte waves inside polystyrene microparticles using experimental analysis and COMSOL simulation. Different sizes of microspheres were optically excited and the acoustic signals were detected. The results obtained from the experimental and COMSOL analysis show close agreement in both time and frequency domain. The theoretical wave velocity of the Scholte wave was calculated and found to be close to the experimental results. A representation of pressure wave motion showing the Scholte wave generation is presented at different times.
Article
Chemistry, Analytical
Sayantani Bhattacharya, Nitin Yadav, Azeem Ahmad, Frank Melandso, Anowarul Habib
Summary: Lead Zirconate Titanate (PZT) is widely used in ultrasound transducers, sensors, and actuators due to its large piezoelectric coefficient. However, micro-defects in PZT sensors can cause a decline in performance, making it necessary to identify and locate these defects using non-destructive structural health monitoring (SHM) methods. Traditional ultrasound SHM techniques are not optimal for non-stationary signals, so this study implements a point contact excitation and detection method and applies Haar discrete wavelet transformation (DWT) for signal processing. The results show successful distinction of defects up to 100 μm in diameter.
Article
Acoustics
Himanshu Singh, Arif Sheikh Ahmed, Frank Melandso, Anowarul Habib
Summary: A point contact/Coulomb coupling technique is used to visualize ultrasonic waves in PZT ceramics. Different types of noise, including speckle, Gaussian, Poisson, and salt and pepper noise, corrupt the ultrasonic signal and degrade the quality of images. This study implements deep learning-based convolutional autoencoders for noise modeling and denoising of ultrasonic images. Quantitative analysis using PSNR and SSIM metrics shows that speckle noise model performs better than other noise models.
Proceedings Paper
Optics
Pan Zheng, Feng Xingtai, Peng Chengxiang
Summary: This paper presents an image processing platform suitable for spaceborne equipment. The platform has high computing precision, fast computing speed, good stability, and low power consumption.
AOPC 2022: OPTICAL SENSING, IMAGING, AND DISPLAY TECHNOLOGY
(2022)
Proceedings Paper
Optics
Chengxiang Peng, Ke Wang, Jinyi Guo, Zheng Pan, Zhen Wang, Haian Zhou
Summary: This paper proposes a stimulated HDR fusion algorithm based on pulse coupled neural network that takes into account the spatial distribution and the relation of pixels of the image brightness. It obtains the brightness mapping function using linear fitting and improves the image entropy and spatial frequency.
AOPC 2022: OPTICAL SENSING, IMAGING, AND DISPLAY TECHNOLOGY
(2022)
Proceedings Paper
Optics
Haian Zhou, Nuo Nan, Zenglong Liu, Zheng Pan, Xingtai Feng, Chengxiang Peng
Summary: This study uses the TLE and SGP4 models to calculate the position and velocity of satellites in the TEME and ECI coordinate systems, and analyzes the influence of the Earth's precession and nutation on the imaging trajectory.
AOPC 2022: OPTICAL SENSING, IMAGING, AND DISPLAY TECHNOLOGY
(2022)
