The Experts below are selected from a list of 348216 Experts worldwide ranked by ideXlab platform
Yu Zhou - One of the best experts on this subject based on the ideXlab platform.
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Zhiguo Wang, Fakun Wang, Jia Zhang, Chengyan Xu, Tianyou Zhai, Yong Qing Fu, Yu Zhou, Pingan HuAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully u...
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Mingjin Dai, Zhiguo Wang, Fakun Wang, Jia Zhang, Tianyou Zhai, Yunfeng Qiu, Wenwu Cao, Dechang Jia, Yu ZhouAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully used for real-time health monitoring, proving their suitability for the fabrication of flexible piezotronic devices due to their large Piezoelectric responses and excellent mechanical durability.
Zhiguo Wang - One of the best experts on this subject based on the ideXlab platform.
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Zhiguo Wang, Fakun Wang, Jia Zhang, Chengyan Xu, Tianyou Zhai, Yong Qing Fu, Yu Zhou, Pingan HuAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully u...
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Mingjin Dai, Zhiguo Wang, Fakun Wang, Jia Zhang, Tianyou Zhai, Yunfeng Qiu, Wenwu Cao, Dechang Jia, Yu ZhouAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully used for real-time health monitoring, proving their suitability for the fabrication of flexible piezotronic devices due to their large Piezoelectric responses and excellent mechanical durability.
Dragan Damjanovic - One of the best experts on this subject based on the ideXlab platform.
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enhanced electromechanical response of ferroelectrics due to charged domain walls
Nature Communications, 2012Co-Authors: Tomas Sluka, M. Y. Gureev, A K Tagantsev, Dragan Damjanovic, N SetterAbstract:While commonly used Piezoelectric materials contain lead, non-hazardous, high-performance Piezoelectrics are yet to be discovered. Charged domain walls in ferroelectrics are considered inactive with regards to the Piezoelectric response and, therefore, are largely ignored in this search. Here we demonstrate a mechanism that leads to a strong enhancement of the dielectric and Piezoelectric properties in ferroelectrics with increasing density of charged domain walls. We show that an incomplete compensation of bound polarization charge at these walls creates a stable built-in depolarizing field across each domain leading to increased electromechanical response. Our model clarifies a long-standing unexplained effect of domain wall density on macroscopic properties of domain-engineered ferroelectrics. We show that non-toxic ferroelectrics like BaTiO(3) with dense patterns of charged domain walls are expected to have strongly enhanced Piezoelectric properties, thus suggesting a new route to high-performance, lead-free ferroelectrics.
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domain wall contributions to the properties of Piezoelectric thin films
Journal of Electroceramics, 2007Co-Authors: Nazanin Bassirigharb, Ichiro Fujii, Eunki Hong, Susan Troliermckinstry, D V Taylor, Dragan DamjanovicAbstract:In bulk ferroelectric ceramics, extrinsic contributions associated with motion of domain walls and phase boundaries are a significant component of the measured dielectric and Piezoelectric response. In thin films, the small grain sizes, substantial residual stresses, and the high concentration of point and line defects change the relative mobility of these boundaries. One of the consequences of this is that thin films typically act as hard Piezoelectrics. This paper reviews the literature in this field, emphasizing the difference between the nonlinearities observed in the dielectric and Piezoelectric properties of films. The effect of ac field excitation levels, dc bias fields, temperature, and applied mechanical stress are discussed.
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Piezoelectric hysteresis analysis and loss separation
Journal of Applied Physics, 2001Co-Authors: G Robert, Dragan Damjanovic, N SetterAbstract:Losses in Piezoelectrics are approached by considering a description of direct stress–charge displacement hysteresis. Shortcomings of the usual loss models (viscous and Rayleigh, taken separately) are briefly demonstrated. Then, a mixed model for Piezoelectric losses superimposing viscous and Rayleigh types of descriptions is proposed and validated for a modified lead titanate and lead zirconate titanate (PZT). It is shown for PZT that viscous and Rayleigh-like loss contributions can be effectively separated by fitting the Piezoelectric hysteresis loop with an expression combining the two lossy responses. The possibility to obtain all the necessary parameters that describe Piezoelectric stress nonlinearity from one single Piezoelectric loop is also demonstrated in the case of PZT. The origins of the mixed loss behavior are interpreted as arising from domain wall motion in terms of internal friction mechanisms and of pinning energy ranges.
Pingan Hu - One of the best experts on this subject based on the ideXlab platform.
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Zhiguo Wang, Fakun Wang, Jia Zhang, Chengyan Xu, Tianyou Zhai, Yong Qing Fu, Yu Zhou, Pingan HuAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully u...
Fakun Wang - One of the best experts on this subject based on the ideXlab platform.
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Zhiguo Wang, Fakun Wang, Jia Zhang, Chengyan Xu, Tianyou Zhai, Yong Qing Fu, Yu Zhou, Pingan HuAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully u...
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two dimensional van der waals materials with aligned in plane polarization and large Piezoelectric effect for self powered Piezoelectric sensors
Nano Letters, 2019Co-Authors: Mingjin Dai, Zhiguo Wang, Fakun Wang, Jia Zhang, Tianyou Zhai, Yunfeng Qiu, Wenwu Cao, Dechang Jia, Yu ZhouAbstract:Piezoelectric two-dimensional (2D) van der Waals (vdWs) materials are highly desirable for applications in miniaturized and flexible/wearable devices. However, the reverse-polarization between adjacent layers in current 2D layered materials results in decreasing their in-plane Piezoelectric coefficients with layer number, which limits their practical applications. Here, we report a class of 2D layered materials with an identical orientation of in-plane polarization. Their Piezoelectric coefficients (e22) increase with layer number, thereby allowing for the fabrication of flexible piezotronic devices with large Piezoelectric responsivity and excellent mechanical durability. The Piezoelectric outputs can reach up to 0.363 V for a 7-layer α-In2Se3 device, with a current responsivity of 598.1 pA for 1% strain, which is 1 order of magnitude higher than the values of the reported 2D Piezoelectrics. The self-powered Piezoelectric sensors made of these newly developed 2D layered materials have been successfully used for real-time health monitoring, proving their suitability for the fabrication of flexible piezotronic devices due to their large Piezoelectric responses and excellent mechanical durability.
