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学者姓名：马赫
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Abstract ：
A flexible actuator, which can convert external stimuli to mechanical motion, is an essential component of every soft robot and determines its performance. As a novel two-dimensional material, MXene has been used to fabricate flexible actuators due to its excellent physical properties. Although MXene-based actuators exhibit excellent actuation performance, their bending deformation is solely due to the in-plane isotropy of the MXene film, and an MXene torsional actuator has not been reported. This study presents a flexible torsional actuator based on an MXene-carbon nanotube (CNT)-paraffin wax (PW) film. In this actuator, the MXene thin film acts as a light absorption layer with wavelength selectivity, superaligned CNT provides structural anisotropy for the composite film, and PW acts as the active layer. The chirality and helical structure of the actuator could be tuned by the orientation of the CNT film. Such an actuator delivers excellent actuation performance, including high work density (similar to 1.2 J/cm3), low triggering power (77 mW/cm2), high rotational speed (320 degrees/s), long lifetime (30,000 cycles), and wavelength selectivity. Inspired by vines, we used the torsional actuator as a spiral grabber, which lifted an object that weighs 20 times more than the actuator. The high-performance torsional actuator would be potentially used as a noncontact sensor, rotary motor, and grabbing tool in the soft robot system.
Keyword ：
torsional actuator torsional actuator paraffin wax paraffin wax soft robot soft robot MXene MXene carbon nanotube carbon nanotube
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| GB/T 7714 | Ding, Jun , Ma, He , Xiao, Xiao et al. Flexible Torsional Photoactuators Based on MXene-Carbon Nanotube-Paraffin Wax Films [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 . |
| MLA | Ding, Jun et al. "Flexible Torsional Photoactuators Based on MXene-Carbon Nanotube-Paraffin Wax Films" . | ACS APPLIED MATERIALS & INTERFACES (2022) . |
| APA | Ding, Jun , Ma, He , Xiao, Xiao , Li, Qingwei , Liu, Kai , Zhang, Xinping . Flexible Torsional Photoactuators Based on MXene-Carbon Nanotube-Paraffin Wax Films . | ACS APPLIED MATERIALS & INTERFACES , 2022 . |
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Abstract ：
Microactuators that convert external stimuli such as heat, light, current, and magnetic field into mechanical motion are essential components in microelectro-mechanical systems. To date, microactuators have been fabricated mainly using conventional microfabrication technologies and inorganic thin films, but although such technologies facilitate the mass production of microdevices, they are expensive and lack flexibility when either preparing only a few devices or facing special needs. Laser-direct-writing is an effective complement to microfabrication, but is seldom used in the construction of inorganic microactuators. In this work, a laser-direct-writing technique on the freestanding vanadium dioxide (VO2) film for fabricating microactuators with arbitrary shapes is developed. The precision of the laser direct writing attained 2 mu m under ultralow pulse energy of 52 pJ. The pulse energy is two orders of magnitude lower than that needed for patterning VO2 film and other semiconductor materials on substrates. The overall performance of the resulting VO2 microactuators is comparable with that of those fabricated by conventional microfabrication technologies, but the fabricating efficiency and flexibility are increased. Such a fabrication strategy can also be used to fabricate other smart microdevices, such as strain sensors and photodetectors.
Keyword ：
laser direct writing laser direct writing microactuator microactuator phase transition phase transition vanadium dioxide vanadium dioxide
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| GB/T 7714 | Li, Yuan , Ma, He , Tang, Fawei et al. Direct Laser Writing of Multishaped VO2 Microactuators Based on Freestanding VO2 Film [J]. | ADVANCED MATERIALS TECHNOLOGIES , 2022 , 8 (1) . |
| MLA | Li, Yuan et al. "Direct Laser Writing of Multishaped VO2 Microactuators Based on Freestanding VO2 Film" . | ADVANCED MATERIALS TECHNOLOGIES 8 . 1 (2022) . |
| APA | Li, Yuan , Ma, He , Tang, Fawei , Li, Chenyu , Wang, Bolun , Song, Xiaoyan et al. Direct Laser Writing of Multishaped VO2 Microactuators Based on Freestanding VO2 Film . | ADVANCED MATERIALS TECHNOLOGIES , 2022 , 8 (1) . |
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Abstract ：
With the growing demand for broadband wireless communication, high-resolution radar, security inspection, and biological analysis, terahertz (THz) technology has made significant progress in recent years. The wide applications of THz technology benefited from the rapid development of various THz functional devices. Metasurface, an essential means of manipulating THz waves, has widely been applied in multiple THz functional devices. However, it is still a great challenge to construct flexible THz metasurface devices due to the lack of flexibility of traditional semiconductor and metal materials. In this work, a two-dimensional material, MXene, is used to prepare flexible metasurfaces with frequency filtering and polarization functions. By further combining with the phase-transition-material vanadium dioxide, the VO2/MXene metasurface exhibits good performance in amplitude modulation under electrical stimulation. The modulation depth of the device reaches 86% under a lower trigger power of 11.6 mW/mm(2) and the response time is only similar to 100 ms. Such a flexible active metasurface with superior performance and high integration will be useful in THz imaging systems, THz sensing systems, etc.
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| GB/T 7714 | Li, Yuan , Ma, He , Wang, Yu et al. Electrically driven active VO2/MXene metasurface for the terahertz modulation [J]. | APPLIED PHYSICS LETTERS , 2022 , 121 (24) . |
| MLA | Li, Yuan et al. "Electrically driven active VO2/MXene metasurface for the terahertz modulation" . | APPLIED PHYSICS LETTERS 121 . 24 (2022) . |
| APA | Li, Yuan , Ma, He , Wang, Yu , Ding, Jun , Qi, Limei , Fu, Yulan et al. Electrically driven active VO2/MXene metasurface for the terahertz modulation . | APPLIED PHYSICS LETTERS , 2022 , 121 (24) . |
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Abstract ：
<正>由于具有多激励、宽谱响应、插入损耗小和响应速度快等优势, VO_2是一种理想的THz波主动调制材料。但是,由于传统半导体基底存在缺乏柔性、热容大、热导率低和不导电等问题,在硬质基底上难以实现高性能VO_2基THz波主动调制器件。为解决上述问题,申请人将VO2生长在顺排CNT薄膜上。顺排CNT薄膜具有沿CNT轴向有序排列的特性。
Keyword ：
偏振方向 偏振方向 二氧化钒 二氧化钒 THz THz 太赫兹波调制器 太赫兹波调制器
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| GB/T 7714 | 马赫 , 王钰 , 张新平 . 超低激发阈值柔性二氧化钒太赫兹波调制器 [J]. | 量子电子学报 , 2021 , 38 (01) : 123 . |
| MLA | 马赫 et al. "超低激发阈值柔性二氧化钒太赫兹波调制器" . | 量子电子学报 38 . 01 (2021) : 123 . |
| APA | 马赫 , 王钰 , 张新平 . 超低激发阈值柔性二氧化钒太赫兹波调制器 . | 量子电子学报 , 2021 , 38 (01) , 123 . |
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Abstract ：
Energy-efficient components that are capable of intelligently regulating room temperature are much demanded to reduce the energy consumption in buildings. In recent years, phase change materials (PCMs) have been widely investigated for intelligent temperature regulation by taking advantages of their unique thermal, optical, and mechanical properties across phase transition. In this review, we summarize the mechanisms of PCMs for intelligent temperature regulation, including latent heat, optical modulation, and mechanical deformation. We then discuss the traditional PCMs, such as organic and inorganic PCMs with huge latent heats, and emerging PCMs, such as VO2, for the applications in temperature controls, smart windows, and radiative cooling surfaces. We finally point out where to focus for these PCMs to realize applications in buildings. This review provides insights into future research of PCMs for their intelligent applications. (C) 2021 Elsevier Ltd. All rights reserved.
Keyword ：
Latent heat Latent heat Mechanical deformation Mechanical deformation Smart windows Smart windows Self-adaptive radiative surfaces Self-adaptive radiative surfaces Vanadium dioxide Vanadium dioxide
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| GB/T 7714 | Guo, Ruihan , Shan, Linbo , Wu, Yonghuang et al. Phase-change materials for intelligent temperature regulation [J]. | MATERIALS TODAY ENERGY , 2021 , 23 . |
| MLA | Guo, Ruihan et al. "Phase-change materials for intelligent temperature regulation" . | MATERIALS TODAY ENERGY 23 (2021) . |
| APA | Guo, Ruihan , Shan, Linbo , Wu, Yonghuang , Cai, Yimao , Huang, Ru , Ma, He et al. Phase-change materials for intelligent temperature regulation . | MATERIALS TODAY ENERGY , 2021 , 23 . |
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Abstract ：
Photoelectronic performance of organic-inorganic hybrid perovskites has been investigated extensively. Advancement in optoelectronic characterization and application of this group of materials in solar cells, light-emitting diodes, and lasers has been pushed forward rapidly. However, nonlinear optical properties for applications in optical logic devices have not been exploited. Moreover, long-lived excitons and charges limit the response speed of such materials and further construction of ultrafast devices. In this work, we make use of the high third-order optical nonlinearity of (CH3NH3)PbBr3 single crystals and develop a femtosecond optical switch (OS) based on strong two-photon processes through absorbing one pump and one probe photon. The fascinating band structure, with a steep edge at 2.22 eV between the transmission and strong absorption bands, endows single crystals of (CH3NH3)PbBr3 with perfect characteristics for two-photon optical switching in the near infrared. An on-off ratio of the probe pulses of about 90% and a speed faster than 400 fs have been achieved for this OS device. To the best of our knowledge, such high efficiency has not been realized for an ultrafast OS with any other materials and devices. Moreover, this is a first exploration, to our best knowledge, of the third-order optical nonlinearity of organic-inorganic hybrid halide perovskites for application in ultrafast optical logic devices with high reliability and low threshold in the near infrared. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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| GB/T 7714 | Zhang, Xinping , Wang, Meng , Ma, Lin et al. Ultrafast two-photon optical switch using single crystal hybrid halide perovskites [J]. | OPTICA , 2021 , 8 (5) : 735-742 . |
| MLA | Zhang, Xinping et al. "Ultrafast two-photon optical switch using single crystal hybrid halide perovskites" . | OPTICA 8 . 5 (2021) : 735-742 . |
| APA | Zhang, Xinping , Wang, Meng , Ma, Lin , Fu, Yulan , Guo, Jinxin , Ma, He et al. Ultrafast two-photon optical switch using single crystal hybrid halide perovskites . | OPTICA , 2021 , 8 (5) , 735-742 . |
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Abstract ：
Due to their high flexibility and adaptability, bionic robots have great potential in applications such as healthcare, rescue, and surveillance. The flexible actuator is an essential component of the bionic robot and determines its performance. Even though much progress has been achieved in bionic robot research, there still exists a great challenge in preparing a flexible actuator with a large stroke, high sensitivity, fast response, low triggering power, and long lifetime. This study presents a flexible actuator based on a paraffin wax and Ti3C2Tx MXene (PW-MX) film composite. Such a flexible actuator delivers an excellent actuation performance, including a large curvature change (2.2 x 10(2) m(-1)), high thermal sensitivity (4.6 m(-1)/degrees C), low triggering power of light (76 mW/cm(2)), wavelength selectivity, fast response (0.38 s), and long lifetime (>20000 cycles). Due to the high thermal sensitivity and the strong infrared absorption of the PW-MX film, crawling motion of an inchworm robot based on PW-MX film can be triggered by infrared irradiation from the human finger. To mimic living organisms with bioluminescence, we prepared a PW-MX actuator with green fluorescence by doping PW-MX film with CdSe/ZnS quantum dots. The integration of luminescent function enables the PW-MX actuator to deliver information under light stimulation and to camouflage under a background of green foliage actively. With its merits of ease of fabrication and high actuation performance, the flexible PW-MX actuator is expected to lend itself to more applications in the future.
Keyword ：
bionic robots bionic robots paraffin wax paraffin wax information delivery information delivery MXene MXene phase transition phase transition camouflage camouflage flexible actuator flexible actuator
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| GB/T 7714 | Xiao, Xiao , Ma, He , Zhang, Xinping . Flexible Photodriven Actuator Based on Gradient-Paraffin-Wax-Filled Ti3C2Tx MXene Film for Bionic Robots [J]. | ACS NANO , 2021 , 15 (8) : 12826-12835 . |
| MLA | Xiao, Xiao et al. "Flexible Photodriven Actuator Based on Gradient-Paraffin-Wax-Filled Ti3C2Tx MXene Film for Bionic Robots" . | ACS NANO 15 . 8 (2021) : 12826-12835 . |
| APA | Xiao, Xiao , Ma, He , Zhang, Xinping . Flexible Photodriven Actuator Based on Gradient-Paraffin-Wax-Filled Ti3C2Tx MXene Film for Bionic Robots . | ACS NANO , 2021 , 15 (8) , 12826-12835 . |
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Abstract ：
Quasi-one-dimensional (QID) semiconductor materials, such as carbon nanotubes, SbSI, MP15 (M = Li, Na, K), and selenium and tellurium nanowires, show amazing potential for applications in future nanoelectronic and optoelectronic devices. However, intricate chirality in the structure of carbon nanotubes limits their applications. Also, the performance of MP15 in optoelectronics has yet to be extensively explored. One new Q1D semiconductor material, fibrous phosphorus (FP), has recently received attention because its raw material is less toxic. However, the ability to characterize FP by phase identification is limited in the assessment of micro/nano-thickness, such as exfibrated FP. So, identifying a precise Raman spectrum will allow for much better characterization. Here, a sufficiently sharp Raman spectrum of FP was obtained and analyzed. Moreover, we demonstrated that high-quality, few-layer FP fibers with thicknesses as low as 5.55 nm can be produced by liquid-phase exfibration under ambient conditions in solvents. More importantly, an optoelectronic detector based on a single FP fiber field-effect-transistor configuration was investigated. A rise time as short as about 40 ms was obtained for the FP transistors, illustrating the potential of FP single bundle crystals as a new one-dimensional material for optoelectronic device applications.
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| GB/T 7714 | Zhang, Guoqing , Liu, Danmin , Tian, Nan et al. Liquid Exfibration and Optoelectronic Devices of Fibrous Phosphorus [J]. | INORGANIC CHEMISTRY , 2020 , 59 (2) : 976-979 . |
| MLA | Zhang, Guoqing et al. "Liquid Exfibration and Optoelectronic Devices of Fibrous Phosphorus" . | INORGANIC CHEMISTRY 59 . 2 (2020) : 976-979 . |
| APA | Zhang, Guoqing , Liu, Danmin , Tian, Nan , Liu, Beiyun , Li, Songyu , You, Congya et al. Liquid Exfibration and Optoelectronic Devices of Fibrous Phosphorus . | INORGANIC CHEMISTRY , 2020 , 59 (2) , 976-979 . |
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| GB/T 7714 | Ma, He , Wang, Yu , Rong, Lu et al. A flexible, multifunctional, active terahertz modulator with an ultra-low triggering threshold (vol 52, pg 631, 2020) [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2020 , 8 (30) : 10474-10474 . |
| MLA | Ma, He et al. "A flexible, multifunctional, active terahertz modulator with an ultra-low triggering threshold (vol 52, pg 631, 2020)" . | JOURNAL OF MATERIALS CHEMISTRY C 8 . 30 (2020) : 10474-10474 . |
| APA | Ma, He , Wang, Yu , Rong, Lu , Tan, Fangrui , Fu, Yulan , Wang, Guang et al. A flexible, multifunctional, active terahertz modulator with an ultra-low triggering threshold (vol 52, pg 631, 2020) . | JOURNAL OF MATERIALS CHEMISTRY C , 2020 , 8 (30) , 10474-10474 . |
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Abstract ：
Vanadium dioxide (VO2) attracts great attention due to its well-known metal-to-insulator transition. However, traditional VO(2)films grown on rigid substrates are inflexible, which limits their applications. In this work, we successfully prepared VO2/silicon nitride (VO2/SN) composite films by a simple template method. The VO2/SN film shows high flexibility, strong infrared absorption, and drastic resistance change (>10(3)) induced by the phase transition. The application of the VO2/SN film is presented by infrared sensing, which shows a high responsivity (720 V W-1) and short response time (409 ms).
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| GB/T 7714 | Ma, He , Wang, Yu , Fu, Yulan et al. A bottom-up strategy toward a flexible vanadium dioxide/silicon nitride composite film with infrared sensing performance [J]. | NANOSCALE , 2020 , 12 (22) : 11863-11867 . |
| MLA | Ma, He et al. "A bottom-up strategy toward a flexible vanadium dioxide/silicon nitride composite film with infrared sensing performance" . | NANOSCALE 12 . 22 (2020) : 11863-11867 . |
| APA | Ma, He , Wang, Yu , Fu, Yulan , Zhang, Xinping . A bottom-up strategy toward a flexible vanadium dioxide/silicon nitride composite film with infrared sensing performance . | NANOSCALE , 2020 , 12 (22) , 11863-11867 . |
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