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- 摘要
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- 实验方案
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Realization of a infrared detector free of bandwidth limit based on quartz crystal tuning fork
摘要： A new type of photoelectric detector based on a standard quartz crystal tuning fork (QCTF) with resonant frequency of ～32 kHz is developed for infrared spectroscopy applications. Analogous to the photoelectric effect of traditional semiconductor detectors, we utilize the piezoelectric effect of the QCTF to gauge the light intensity. To demonstrate this technique, the spectral absorption features of C2H2 molecule have been recorded and compared with a commercial mercury cadmium-telluride (MCT) detector. The proposed detection technique may pave a new way towards developing a new type of photodetector without bandwidth limit and complicated cryogenic cooling.
关键词： Infrared detector,Piezoelectric effect,QCTF,Laser spectroscopy
更新于2025-09-23 15:23:52
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One-Structure-Based Multi-Effects Coupled Nanogenerators for Flexible and Self-Powered Multi-Functional Coupled Sensor Systems
摘要： The simultaneous monitoring of multi-physical signals is essential for future sensor systems, but is currently only realized by integrating a variety of sensor types into a single device. However, the ability to use a single sensor structure that shares common electrodes can provide a route to multi-functional sensing while also decreasing device size and increasing spatial resolution. Here we report a ferroelectric barium titanate film-based multi-effect coupled nanogenerator for scavenging light, mechanical, and thermal energies to realize a self-powered multi-functional coupled sensor system without using any external power source. The coupled nanogenerator exhibits a strong coupling enhancement with detection sensitivities of 0.42 nA/(mW/cm2) during illumination by 405 nm light, 1.43 nA/kPa for pressure detection, and -8.85 nA/K for temperature sensing, where both the light and pressure sensing performances have the highest sensitivities during a cooling temperature variation of ~19.5 K and the largest temperature detection sensitivity can be achieved during strong light illumination of 83.2 mW/cm2. Moreover, the coupled nanogenerator array can be integrated into flexible forms for tactile pressure, temperature, and light sensors, and enabling coupled sensing for the development of electronic skins.
关键词： photovoltaic effect,pyroelectric effect,piezoelectric effect,electronic skin
更新于2025-09-23 15:19:57
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Output error of converse piezoelectric fiber voltage sensor caused by optical fiber factors
摘要： In fiber voltage sensor, imperfect fiber splicing angle and length difference between the sensing fiber and the compensating fiber usually influence the system output performance. This article established the mathematical model of the system output error using the Jones matrix and analyzed the relationship between the system output error and the above two error factors, respectively. The results show that the angle error of 90(cid:2) splice has a significant influence on the system output, and the tolerance of angle error varies with different test voltages. When the test voltage is higher than 6 kV, if the expected system error is less than 0.02%, the splicing angle error should be less than 0.15(cid:2). Additionally, the length difference also has a significant influence on the system output accuracy. The length difference between sensing fiber and compensating fiber should be less than 1 mm when the test voltage is 110 kV so that the system can meet the accuracy requirements of IEC 0.2s. This research provides a reference for the development of fiber voltage sensor based on the converse piezoelectric effect and also provides a basis for the design of intelligent power detection robot system.
关键词： Optical voltage sensor,mathematical modeling,converse piezoelectric effect,output error
更新于2025-09-12 10:27:22
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Piezoelectric Modulation of Broadband Photoresponse of Flexible Tellurium Nanomesh Photodetectors
摘要： Flexible photodetector shows great potential applications in intelligent wearable devices, health monitoring, and biological sensing. In this work, single crystal β-tellurium nanowires were grown on flexible muscovite by molecular beam epitaxy, constructing high-density ordered nanomesh structure. The prepared photodetectors based on tellurium nanomesh exhibit excellent mechanical flexibility, fast response in a broad range from ultraviolet to near-infrared, and good photosensitivity. We found that the flexible photodetectors with Shottky contact drastically suppressed dark current, while the response speed was lowered in comparison to the devices with ohmic contact, as holes would take long time to tunnel through the Shottky barrier between metal and p-type Te. Moreover, photoresponse of flexible Shottky photodetectors can be modulated by piezoelectricity of tellurium, and pronounced photocurrent increase after many times of bend. Under external stress, polarization charges could tune Shottky barrier height of the metal/tellurium, resulting in variation of photocurrent. The research not only explores the broadband photoresponse and piezoelectric effect of tellurium nanomesh, but also promotes the integration and development of broadband flexible optoelectronic devices.
关键词： tellurium nanomesh,piezoelectric effect,broadband photoresponse,molecular beam epitaxy,flexible photodetector
更新于2025-09-11 14:15:04
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Micropyramid silicon wafer with ZnO nanowires as high efficiency piezoelectric nanogenerator
摘要： The piezoelectric nanogenerator (PENG) is an important landmark in the development nanotechnology. The PENG, conventing mechanical energy to electrical energy in nanoscale, relies on the coupling of piezoelectric and semiconducting properties of nanomaterials. This approach offers a potential solution for harvesting energy from the environment for self-powered nanotechnology. How to improve the conversion efficiency is still one of the most factors for current PENG. Here, based on the fundamental research of piezoelectric nanogenerators, we propose a simple, robust, and scalable approach for fabricating a nanowire nanogenerator in which, ZnO nanowires is grown on the micro-pyramid textured surface of the silicon wafer and then a nanogenerator is fabricated by simply combine two substrates with ZnO nanowires face-to-face. The proposed geometry allows the nanogenerator to collect multi-faceted mechanical energy. This pyramid structure of the ZnONWs nanogenerators can generate piezoelectric current with an average signal about 3nA when the device was drove by ultrasonic waves at 40 kHz.
关键词： pyramid Si,piezoelectric effect,ZnO nanowires,nanogenerator
更新于2025-09-10 09:29:36
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Experimental Investigation of Surface Acoustic Wave Acoustoelectric Effect using a Graphene Film on Lithium Niobate
摘要： Experimental results of the measured surface acoustic wave (SAW) acoustoelectric effect (AE) using single-layer thin-film graphene on 128°, Y-cut, and X-propagating lithium niobate (128-LN) are presented. The use of an AE amplifier in SAW communication devices, especially in gigahertz bands, could make fundamental advancements in radios, sensors, and other applications. Experimental results at 1350 MHz show the delay line asymmetry of 3 dB, given as the ratio of the forward versus reverse peak SAW frequency response, with an applied dc voltage on the graphene film.
关键词： surface acoustic wave (SAW),Piezoelectric effect,surface acoustic wave (SAW) filters
更新于2025-09-10 09:29:36
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Applications of Piezoelectrics: Old and New
摘要： Piezoelectric materials convert electrical energy to mechanical energy and vice versa, resulting in observed properties that are electromechanically coupled. When a piezoelectric is deformed, that mechanical energy is transformed to electrical energy, which is known as the direct piezoelectric effect. When the reverse occurs, and an electric field is applied, the material physically deforms, resulting in the converse piezoelectric effect. Therefore, piezoelectric materials can be used in both sensor and actuator applications. The magnitude of the piezoelectric response is often expressed as the longitudinal piezoelectric coefficient, d33. When measuring the direct piezoelectric effect, d33 is the polarization generated per unit of mechanical stress, where the field and stress are along the same direction. In the converse effect, d33 is the induced mechanical strain per unit of electric field applied, with the field and stress also in the same direction. Another measure of effectiveness of a piezoelectric is called the electromechanical coupling factor, k. This value expresses the efficiency of conversion from mechanical to electrical energy or vice versa.
关键词： actuator applications,electromechanical coupling factor,sensor applications,direct piezoelectric effect,Piezoelectric materials,converse piezoelectric effect
更新于2025-09-09 09:28:46
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Dynamic regulating of single-mode lasing in ZnO microcavity by piezoelectric effect
摘要： Realizing single-mode-lasing output while being able to dynamically select and regulate a specified resonant mode could bring revolutionary impact for laser technology, on-chip data communication, and optical sensing/switches. Here, we demonstrate a single-mode lasing achieved by the piezoresistive and piezoelectric polarization synergistic effect on an epoxy-encapsulated ZnO microresonator. Based on relative shifts of gain spectrum and the resonant wavelength, the lasing mode in a hexagonal ZnO rod can be selected and regulated dynamically within a certain range. The relationship between the corresponding applied strain and the tunable refractive index is analyzed in depth and discussed systematically. Our studies open up exciting avenues for constructing optical mode-phase modulator, high-sensitive optical switches and color-perceived optical sensing.
关键词： optical sensing,ZnO microresonator,single-mode lasing,piezoelectric effect,dynamic regulation
更新于2025-09-04 15:30:14