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Photoinduced triboelectric polarity reversal and enhancement of a new metal/semiconductor triboelectric nanogenerator
摘要： We reported a novel metal/semiconductor triboelectric nanogenerator (TENG) based on Au and TiO2 as the friction layers. Upon illumination, the current polarity rapidly reverses compared to the dark state. The negative and positive short-circuit current approximately increase by 12 and 2 times, respectively. Particularly, a photocurrent plateau appears due to the formation of metal-semiconductor Schottky contact in the device. By carefully analyzing the charge transfer in dark and under illumination, it is found that the accumulation of a large number of photoelectrons on the surface of TiO2 and the increase of conductivity are the reasons for the reversal current polarity and significant current increase under illumination. Our work provides a new approach for improving TENG output and a new understanding about the effect of surface states on the triboelectric performance especially the polarity of TENG.
关键词： ultrathin Au,photoelectrons,triboelectric polarity reversal,Triboelectric nanogenerator,TiO2 surface states
更新于2025-09-23 15:23:52
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Metal nanowire–polymer matrix hybrid layer for triboelectric nanogenerator
摘要： In this work, we studied the surface potential of a metal–polymer hybrid layer and its effect on the performance of a triboelectric nanogenerator (TENG). Ag nanowires (AgNWs) separately embedded in two different polymers–one with a positive tribopotential and the other with a negative tribopotential–were prepared as model hybrid systems. The surface potentials of the hybrid system were systematically investigated by Kelvin probe force microscopy. The results demonstrated that each component of the hybrid layer affected the other component because of the difference in their work functions. The following two important findings were obtained. First, the surface potential of each polymer shifted drastically toward that of Ag and the surface potential of Ag shifted toward that of each polymer. Second, higher density of AgNWs led to higher Ag-induced charge density in the polymer, which consequently resulted in larger shift in the surface potential of the polymer. TENG performance measurements revealed that the tribopotential difference between the contact surfaces of the AgNW–polymer hybrid layer and the perfluoroalkoxy alkane (or Nylon) used as the top triboelectric layer governed the TENG performance. Our systematic investigation of the surface potential of a hybrid surface consisting of two materials with different surface potentials provides insight into the design of triboelectric layers for high-performance TENGs.
关键词： triboelectric nanogenerator,silver nanowire,kelvin probe force microscopy,hybrid,surface potential
更新于2025-09-23 15:22:29
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A theoretical modeling analysis for triboelectrification controlled light emitting diodes
摘要： In this paper, we demonstrate the use of triboelectric nanogenerator (TENG) as a mean of mechanical light triggering to control InGaN-based light-emitting diodes (LEDs). Light extraction from the LED is two successive steps process. First, the voltage produced by the TENG is used to control the gate-to-source current of a MOSFET transistor through adjusting the transistor channel width and length. The second step is forwarding the drain-source current resulting from MOSFET transistor to the LED as its injection current to induce spontaneous emission from the LED surface to the air. Three LED colors are considered: red, green and blue. Significant emitted power from these InGaN-based LEDs in the RGB wavelength band is observed for both P-MOSFET and N-MOSFET transistor configurations. The emitted optical spectrum is controlled by optimizing the combined TENG-MOSFET-RGB LED geometry; dimensions and the bias voltage between the drain and source terminals of the MOSFET transistor. With recent advances in TENGs as an energy harvesting technology, it is expected that this study offers an approach to enhance the light extraction of various LED devices. With the enhancements in the performance of optoelectronic devices, the field of tribo- phototronics has attracted more attention, and in this work, we introduce the first theoretical framework, to the best of our knowledge, based on finite element modeling. This study provides significant insights into the working principles of tribo-Phototronic devices as well as guidelines for future device design.
关键词： MOSFET,Light-emitting diodes,Finite element modeling,Triboelectric nanogenerator,Tribo-phototronics
更新于2025-09-23 15:21:01
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The Progress of PVDF as a Functional Material for Triboelectric Nanogenerators and Self-Powered Sensors
摘要： Ever since a new energy harvesting technology, known as a triboelectric nanogenerator (TENG), was reported in 2012, the rapid development of device fabrication techniques and mechanical system designs have considerably made the instantaneous output power increase up to several tens of mW/cm2. With this innovative technology, a lot of researchers experimentally demonstrated that various portable/wearable devices could be operated without any external power. This article provides a comprehensive review of polyvinylidene fluoride (PVDF)-based polymers as effective dielectrics in TENGs for further increase of the output power to speed up commercialization of the TENGs, as well as the fundamental issues regarding the materials. In the end, we will also review PVDF-based sensors based on the triboelectric and piezoelectric effects of the PVDF polymers.
关键词： sensor,triboelectric nanogenerator,PVDF
更新于2025-09-23 15:21:01
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Tunable Work Function of MgxZn1-xO as a Viable Friction Material for Triboelectric Nanogenerator
摘要： Since the invention of triboelectric nanogenerators (TENGs), their output performance has been improved through various approaches such as material surface modification, device structure optimization and so on, but rarely through the development of new friction materials. In this work, magnetron sputtered MgxZn1-xO film is developed as a viable friction material, that rubs against polydimethylsiloxane (PDMS) in TENG. The work function, measured by Kelvin probe microscopy, of the MgxZn1-xO films can be effectively tuned by varying Mg composition, x, and exposed surface facets, which are shown to dominate the charge transfer behavior. In addition, film thickness also plays an important role, affecting the output performance. The output voltage and total charge of a TENG with MgxZn1-xO film are demonstrated to be tremendously enhanced by 55 and 90 times, respectively, compared to that of a TENG with ZnO film. Even more intriguingly, the tribo-output polarity can be reversed by adjusting the relative work function through varying the preferred growth orientation of the MgxZn1-xO film, for a given value of Mg content.
关键词： surface facet,triboelectric nanogenerator,work function,ZnO,MgxZn1-xO,thickness effect
更新于2025-09-23 15:19:57
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A multifunctional and highly flexible triboelectric nanogenerator based on MXene-enabled porous film integrated with laser-induced graphene electrode
摘要： The ambient dissipated energy such as the vast scale of mechanical energy in the agricultural system (e.g., leaf swing energy) and the writing motion existing extensively in our daily life are underutilized. Herein, to address these issues and overcome the limitations of conventional batteries, we fabricated a highly ?exible and e?ective triboelectric nanogenerator (TENG) based on MXene and polydimethylsiloxane (PDMS) composite (PDMS/MXene) ?lm and laser-induced graphene (LIG) electrode. The introduction of conductive and electronegative MXene into PDMS to fabricate porous ?lm, not only enhances the electrical conductivity but also increases the triboelectronegativity. As a result, the output performance is signi?cantly improved, 7-fold greater than the pure ?at PDMS-based TENG. The developed TENG with excellent performance, considerable adhesion, and outstanding ?exibility was successfully applied for harvesting leaf swing energy and being used as a writing board to collect writing energy. Furthermore, we developed a MXene-based TENG array acting as a self-powered sensor for handwriting recognition. In this regard, MXene-enabled TENG possesses a great promising in harvesting mechanical energy from the agricultural ?eld (e.g., leaf swing energy) and human activities (e.g., writing), moreover, it can further be applied in writing or tactile sensing for pad, robotics, and man-machine interaction ?eld.
关键词： MXene,Writing energy,Laser-induced graphene,Triboelectric nanogenerator,Leaf swing energy
更新于2025-09-19 17:13:59
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Hybrid energy harvester with bi-functional nano-wrinkled anti-reflective PDMS film for enhancing energies conversion from sunlight and raindrops
摘要： The hybrid energy harvester composed of a solar cell and a water-drop triboelectric nanogenerator (WD-TENG) has been reported to harvest energy from sunlight or raindrops depends on the changing natural environment. However, the reported integrated WD-TENGs always reduce the light absorption of solar cells, resulting in a decline of solar cell efficiency. Here, a bi-functional nano-wrinkled polydimethylsiloxane (nw-PDMS) film is introduced to fabricate the hybrid energy harvester, serving as both the anti-reflective layer of the solar cell and the triboelectric layer of the WD-TENG, and simultaneously enhancing the energy harvesting efficiency from sunlight and raindrop. With significantly enhanced transmittance due to the anti-reflective coating, the power conversion efficiency of the solar cell has improved from 12.55% to 13.57%. In addition, due to the high aspect ratio, surface fluorination and strong hydrophobicity of the nw-PDMS film, both open circuit voltage (VOC-T) and short-circuit current (ISC-T) of the WD-TENG have huge enhancement by 385.5% and 299.1%, respectively. In this work, the introducing of bi-functional nw-PDMS film provides a simple and convenient strategy for designing hybrid energy harvester with enhanced output performances, which is a general route for Si-based solar cell and other kinds of solar cells.
关键词： solar cell,nano structure,raindrop energy,triboelectric nanogenerator,anti-reflective coating
更新于2025-09-19 17:13:59
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Flexible Self-Powered Real-Time Ultraviolet Photodetector by Coupling Triboelectric and Photoelectric Effects
摘要： The portable UV photodetector is used to remind human timely from the overexposure to UV radiation. However, the traditional UV photodetector cannot meet the practical demands and power supply problem hinders its further development. In this work, we demonstrated a flexible, transparent and self-powered UV photodetector, by coupling of triboelectric effect and photoelectric effect. The device integrates a flexible ZnO nanoparticles (NPs) UV photodetector, a transparent and flexible film based TENG (TFF-TENG), commercial chip resisters and LEDs on PET thin film. The TFF-TENG could harvest mechanical energy from finger tapping and sliding motion and power the ZnO NPs UV photodetector to realize self-powered detection. The voltage of the constant resistors connected with UV photodetector in series changes from 0.5 to 19 V under the UV light with power intensities increasing from 0.46 to 21.8 mW/cm2 and the voltage variation is reflected by the number of LEDs directly. The excellent flexibility and transparency of the device could extend its application scenarios; for example, such a portable device could be applied to real-time monitoring of the UV radiation to remind human from intense UV light.
关键词： flexible,triboelectric nanogenerator,self-powered sensor,transparent,UV photodetector
更新于2025-09-19 17:13:59
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Transcatheter Self-Powered Ultrasensitive Endocardial Pressure Sensor
摘要： Changes in endocardial pressure (EP) have important clinical significance for heart failure patients with impaired cardiac function. As a vital parameter for evaluating cardiac function, EP is commonly monitored by invasive and expensive cardiac catheterization, which is not feasible for long-term and continuous data collection. In this work, a miniaturized, flexible, and self-powered endocardial pressure sensor (SEPS) based on triboelectric nanogenerator (TENG), which is integrated with a surgical catheter for minimally invasive implantation, is reported. In a porcine model, SEPS is implanted into the left ventricle and the left atrium. The SEPS has a good response both in low- and high-pressure environments. The SEPS achieves the ultrasensitivity, real-time monitoring, and mechanical stability in vivo. An excellent linearity (R2 = 0.997) with a sensitivity of 1.195 mV mmHg?1 is obtained. Furthermore, cardiac arrhythmias such as ventricular fibrillation and ventricular premature contraction can also be detected by SEPS. The device may promote the development of miniature implantable medical sensors for monitoring and diagnosis of cardiovascular diseases.
关键词： minimally invasive,cardiovascular disease,self-powered,triboelectric nanogenerator,endocardial pressure sensor
更新于2025-09-10 09:29:36
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Effects of Environmental Atmosphere on the Performance of Contact–Separation Mode TENG
摘要： With great potential applications, triboelectric nanogenerator (TENG), is widely studied from various aspects, while systematic investigations about the effects of environmental atmosphere on its performance remain to be carried out. Here, a test system based on a piston-structured TENG and one-way valve gas line is built, employing the contact–separation mode. A series of tests about short-circuit transfer charges (QSC) and open-circuit voltage (VOC) are studied among three kinds of dielectric materials (PTFE, Kapton, PET), in five pure gases (N2, O2, CO2, Ar, He). At a static gas flow rate of 3 L min?1 or static gas pressure of 6 kPa above 1 atm, multicycle statistics demonstrate that TENGs achieve the highest performance in CO2 and the lowest in He. Meanwhile, Kapton-based TENG shows the greatest disparity in different atmosphere, followed by PET-based TENG, and PTFE-based TENG. A microscale discharge mechanism is introduced to explain all the above. Moreover, a negative linear relationship between QSC and the static gas pressure above 1 atm is found. This study is an important reference for a high-performance TENG configuration and device packaging in the future.
关键词： microscale discharge,performance,piston structure,environmental atmosphere,triboelectric nanogenerator
更新于2025-09-04 15:30:14