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Mechanically durable,super-repellent 3D printed microcell/nanoparticle surfaces

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Nano Research 2022年第6期15卷 5678-5686页

作者： Sajad Haghanifar Anthony J Galante Mehdi Zarei Jun Chen Susheng Tan Paul W Leu department of Industrial engineering University of PittsburghPittsburghPA 15261USA department of Mechanical engineering and Materials Science University of PittsburghPittsburghPA 15261USA department of electrical and computer engineering and peterson institute of nanoscience and engineering University of PittsburghPittsburghPA 15261USA department of Chemical engineering University of PittsburghPittsburghPA 15261USA

Three-dimensional(3D)printed re-entrant micropillars have demonstrated high static contact angles for an unprecedented variety of liquids,but have yet to achieve this with low contact angle hysteresis and excellent abrasion *** report on the demonstration of 3D printed microcell/nanoparticle structures that exhibit high static contact angle,low contact angle hysteresis,and high mechanical *** and microcells both exhibit high static contact angles with water and ethylene glycol(EG),but suffer from high contact angle hysteresis,indicative of rose petal *** modeling results indicate that micropillars are able to achieve higher static contact angle and breakthrough pressure simultaneously compared with ***,simulations also indicate that micropillars have higher maximum equivalent stress at their bases,so that they are more prone to mechanical *** address contact angle hysteresis and mechanical durability issues by the creation of 3D printed microcell/nanoparticle arrays that demonstrate super-repellency and retain their super-repellency after 100 cycles of mechanical abrasion with a Scotch-Brite abrasive pad under a pressure of 1.2 *** use of interconnected microcell structures as opposed to micropillars addresses mechanical durability *** contact angle hysteresis is realized by coating 3D printed structures with low surface energy nanoparticles,which lowers the solid–liquid contact area *** results demonstrate new 3D printed structures with mechanical durability and super-repellency through the use of microcell structures integrated with fluorinated nanoparticles.

关键词： superomniphobicity three-dimensional(3D)printing surface evolver mechanical durability microcell re-entrant micropillar

electrically injected GeSn lasers with peak wavelength up to 2.7 μm

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Photonics Research 2022年第1期10卷 222-229页

作者： YIYIN ZHOU SOLOMON OJO CHEN-WEI WU YUANHAO MIAO HUONG TRAN JOSHUA MGRANT GREY ABERNATHY SYLVESTER AMOAH JAKE BASS GREGORY SALAMO WEI DU GUO-EN CHANG JIFENG LIU JOE MARGETIS JOHN TOLLE YONG-HANG ZHANG GREG SUN RICHARD ASOREF BAOHUA LI SHUI-QING YU department of electrical engineering University of ArkansasFayettevilleArkansas 72701USA Microelectronics-Photonics Program University of ArkansasFayettevilleArkansas 72701USA department of Mechanical engineering Taiwan Chung-Cheng UniversityMing-HsiungChiayi 62102China department of Physics University of ArkansasFayettevilleArkansas 72701USA institute for nanoscience and engineering University of ArkansasFayettevilleArkansas 72701USA department of electrical engineering and Physics Wilkes UniversityWilkes-BarrePennsylvania 18766USA Thayer School of engineering Dartmouth CollegeHanoverNew Hampshire 03755USA School of electrical Energy and Computer EngineeringArizona State UniversityTempeArizona 85287USA department of electrical engineering University of Massachusetts BostonBostonMassachusetts 02125USA Arktonics LLCFayettevilleArkansas 72701USA

GeSn lasers enable the monolithic integration of lasers on the Si platform using all-group-Ⅳ direct-bandgap *** GeSn laser study recently moved from optical pumping into electrical *** this work,we present explorative investigations of GeSn heterostructure laser diodes with various layer thicknesses and material *** layer material was studied by using Si_(0.03)Ge_(0.89)Sn_(0.08) and Ge_(0.95)Sn_(0.05),and cap layer total thickness was also *** 190 nm SiGeSn-cap device had threshold of 0.6 kA/cm^(2) at 10 K and a maximum operating temperature(T_(max)) of 100 K,compared to 1.4 kA/cm^(2) and 50 K from 150 nm SiGeSn-cap device,***,the 220 nm GeSn-cap device had 10 K threshold at 2.4 kA/cm^(2) and T_(max) at 90 K,i.e.,higher threshold and lower maximal operation temperature compared to the SiGeSn cap layer,indicating that enhanced electron confinement using SiGeSn can reduce the threshold *** study of the active region material showed that device gain region using Ge_(0.87)Sn_(0.13) had a higher threshold and lower T_(max),compared to Ge_(0.89)Sn_(0.11).The performance was affected by the metal absorption,free carrier absorption,and possibly defect density *** maximum peak wavelength was measured as 2682 nm at 90 K by using Ge_(0.87)Sn_(0.13) in gain *** investigations provide directions to the future GeSn laser diode designs toward the full integration of group-Ⅳ photonics on a Si platform.

关键词： GeSn pumping absorption

Graphene Bridge Heterostructure Devices for Negative Differential Transconductance Circuit Applications

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Nano-Micro Letters 2023年第2期15卷 161-171页

作者： Minjong Lee Tae Wook Kim Chang Yong Park Kimoon Lee Takashi Taniguchi Kenji Watanabe Min‑gu Kim Do Kyung Hwang Young Tack Lee department of electrical and computer engineering Inha UniversityIncheon 22212Republic of Korea department of Materials Science and engineering The University of Texas at DallasRichardsonTX 75080USA Center for Opto‑Electronic Materials and Devices Post‑Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea department of Physics Kunsan National UniversityGunsan 54150Republic of Korea Advanced Materials Laboratory National Institute for Materials ScienceTsukuba 305‑0044Japan department of Information and Communication engineering Inha UniversityIncheon 22212Republic of Korea Division of nanoscience and Technology KIST SchoolUniversity of Science and Technology(UST)Seoul 02792Republic of Korea department of Electronic engineering Inha UniversityIncheon 22212Republic of Korea

Two-dimensional van der Waals(2D vdW)material-based heterostructure devices have been widely studied for high-end electronic applications owing to their heterojunction *** this study,we demonstrate graphene(Gr)-bridge heterostructure devices consisting of laterally series-connected ambipolar semiconductor/Gr-bridge/n-type molybdenum disulfide as a channel material for field-effect transistors(FET).Unlike conventional FET operation,our Gr-bridge devices exhibit nonclassical transfer characteristics(humped transfer curve),thus possessing a negative differential *** phenomena are interpreted as the operating behavior in two series-connected FETs,and they result from the gate-tunable contact capacity of the Gr-bridge ***-value logic inverters and frequency tripler circuits are successfully demonstrated using ambipolar semiconductors with narrow-and wide-bandgap materials as more advanced circuit applications based on non-classical transfer ***,we believe that our innovative and straightforward device structure engineering will be a promising technique for future multi-functional circuit applications of 2D nanoelectronics.

关键词： Graphene bridge Heterostructure device Non-classical transfer characteristics Multi-value logic inverter Frequency tripler

A Triethyleneglycol C60 Mono-adduct Derivative for Efficient Electron Transport in Inverted Perovskite Solar Cells

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Chinese Journal of Chemistry 2023年第4期41卷 431-442页

作者： Azhar Fakharuddin Konstantina-Kalliopi Armadorou Leandros P.Zorba Marinos Tountas Tobias Seewald Anastasia Soultati Polychronis Tsipas Emilia R.Schütz Nikolaos Tzoganakis Stylianos Panagiotakis Konstantina Yannakopoulou Athanasios Dimoulas Vassilis Psycharis Emmanuel Kymakis Abd Rashid bin Mohd Yusoff Konstantinos Aidinis Lukas Schmidt-Mende Georgios C.Vougioukalakis Mohammad Khaja Nazeeruddin Maria Vasilopoulou department of Physics University of Konstanz78457 KonstanzGermany institute of nanoscience and Nanotechnology National Center for Scientific Research DemokritosAgia Paraskevi15341 AthensGreece department of Chemistry National and Kapodistrian University of Athens15771 AthensGreece department of electrical&computer engineering Hellenic Mediterranean UniversityEstavromenosHeraklionGR-71410 CreteGreece department of Chemical engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbuk37673 Republic of Korea department of electrical and computer engineering Ajman UniversityP.O.Box 346AjmanUnited Arab Emirates Center of Medical and Bio-allied Health Sciences Research AjmanUnited Arab Emirates institute of Chemical Sciences and engineering École Polytechnique Fédérale de Lausanne(EPFL)Rue de l'Industrie 17CH-1951 SionSwitzerland

Inverted perovskite solar cells(PSCs)have attracted increasing attention in recent years owing to their low-temperature fabrication proces ***,they suffer from a limited number of electron transport materials available with[6,6]-phenyl C61 butyric acid methyl ester(PCBM)to be the most widely studied based on its appropriate energy levels and high electron *** low relative permittivity and aggregation tendency upon illumination of PCBM,however,compromises the solar cell efficiency whereas its modest hydrophobicity negatively impacts on the device *** electron transport materials with desired properties and appropriate degree of hydrophobicity are thus desirable for further developments in inverted ***,we synthesize a triethyleneglycol C60 mono-adduct derivative(termed as EPF03)and test it as a novel electron transport material to replace PCBM in inverted PSCs based on a quadruple cation(RbCsMAFA)*** also compare this derivative with two novel fullerenes decorated with two(EPF01)or one dodecyl(EPF02)long side *** latter two fail to perform efficiently in inverted PSCs whereas the former enabled a power conversion efficiency of 18.43%,which represents a 9%improvement compared to the reference device using PCBM(17.21%).The enhanced performance mainly stems from improved electron extraction and reduced recombination enabled by the insertion of the large relative permittivity amongst other properties of ***,our results indicate that triethylene glycol side chains can also passivate perovskite trap states,suppress ion migration and enhance photostability and long-term stability of EPF03 based perovskite solar cells.

关键词： Electron transport layer Defect passivation Biexponential trap flling Charge transfer Fullerenes

Human Machine Interface with Wearable Electronics Using Biodegradable Triboelectric Films for Calligraphy Practice and Correction

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Nano-Micro Letters 2022年第12期14卷 630-644页

作者： Shen Shen Jia Yi Zhongda Sun Zihao Guo Tianyiyi He Liyun Ma Huimin Li Jiajia Fu Chengkuo Lee Zhong Lin Wang Jiangsu engineering Technology Research Center for Functional Textiles Jiangnan UniversityNo.1800 Lihu AvenueWuxiP.R.China department of electrical and computer engineering National University of Singapore4 Engineering Drive 3Singapore 117576Singapore CAS Center for Excellence in nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083P.R.China China National Textile and Apparel Council Key Laboratory of Natural Dyes Soochow UniversitySuzhou 215123People’s Republic of China School of Material Science and engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

Letter handwriting,especially stroke correction,is of great importance for recording languages and expressing and exchanging ideas for individual behavior and the *** this study,a biodegradable and conductive carboxymethyl chitosan-silk fibroin(CSF)film is prepared to design wearable triboelectric nanogenerator(denoted as CSF-TENG),which outputs of V_(oc)≈165 V,I_(sc)≈1.4μA,and Q_(sc)≈72 mW cm^(−2).Further,in vitro biodegradation of CSF film is performed through trypsin and *** results show that trypsin and lysozyme have stable and favorable biodegradation properties,removing 63.1%of CSF film after degrading for 11 ***,the CSF-TENG-based human-machine interface(HMI)is designed to promptly track writing steps and access the accuracy of letters,resulting in a straightforward communication media of human and *** CSF-TENG-based HMI can automatically recognize and correct three representative letters(F,H,and K),which is benefited by HMI system for data processing and *** CSF-TENG-based HMI can make decisions for the next stroke,highlighting the stroke in advance by replacing it with red,which can be a candidate for calligraphy practice and ***,various demonstrations are done in real-time to achieve virtual and real-world controls including writing,vehicle movements,and healthcare.

关键词： Letter handwriting Triboelectric nanogenerator Biodegradable Human-machine interface Calligraphy practice

1D quasi-bound states in the continuum with large operation bandwidth in theω~k space for nonlinear optical applications

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Photonics Research 2022年第7期10卷 1575-1581页

作者： KAILI SUN HUI JIANG DMITRY ABYKOV VIEN VAN URIEL LEVY YANGJIAN CAI ZHANGHUA HAN Shandong Provincial Key Laboratory of Optics and Photonic Devices Center of Light Manipulation and ApplicationsSchool of Physics and ElectronicsShandong Normal UniversityJinan 250358China Image Processing Systems institute—Branch of the Federal Scientific Research Centre“Crystallography and Photonics”of Russian Academy of Sciences Samara 443001Russia department of electrical and computer engineering University of AlbertaEdmontonAlberta T6G 2V4Canada department of Applied Physics and Center for Nanoscience and NanotechnologyThe Hebrew University of JerusalemJerusalemIsrael

The phenomenon of bound state in the continuum(BIC)with an infinite quality factor and lifetime has emerged in recent years in photonics as a new tool to manipulate light-matter ***,most of the investigated structures only support BIC resonances at very few discrete points in theω~k *** when the BIC is switched to a quasi-BIC(QBIC)resonance through perturbation,its frequency will still be located within a narrow spectral band close to that of the original BIC,restricting their applications in many fields where random or multiple input frequencies beyond the narrow band are *** this work,we demonstrate that a new set of QBIC resonances can be supported by using a special binary grating consisting of two alternatingly aligned ridge arrays with the same period and zero-approaching ridge width difference on a slab *** QBIC resonances are distributed continuously over a broad band along a line in theω~k space and can thus be considered as 1 D *** the Q factors generally affected by the ridge difference,it is now possible to arbitrarily choose any frequencies on the dispersion line to achieve significantly enhanced light-matter interactions,facilitating many applications where multiple input wavelengths are required;e.g.,sum or difference frequency generations in nonlinear optics.

关键词： quasi nonlinear narrow

Insights into microstructural evolution and deformation behaviors of a gradient textured AZ31B Mg alloy plate under hypervelocity impact

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Journal of Materials Science & Technology 2021年第32期91卷 40-57页

作者： Weigui Zhang Kun Li Runqiang Chi Susheng Tan Peijie Li Beijing Innowind Aerospace Equipment Co. Ltd.Beijing 100854China College of Mechanical and Vehicle engineering Chongqing UniversityChongqing 400044China The State Key Lab of Mechanical Transmissions Chongqing UniversityChongqing 400044China Hypervelocity Impact Research Center Harbin Institute of TechnologyHarbin 150080China department of electrical and computer engineering and Petersen institute of nanoscience and engineering University of PittsburghPittsburghPennsylvania 15260USA department of Mechanical engineering Tsinghua UniversityBeijing 100084China

We have for the first time elucidated the microstructural evolution and deformation behaviors of a gradient textured AZ31 B Mg alloy plate under the ultrahigh strain rate of ~10~6 s^(-1) that is generated by a two-stage light gas gun with the hypervelocities of 1.6-4.4 km s^(-1). The hypervelocity impact cratering behaviors indicate that the cratering deformation of AZ31 B Mg alloy is mainly affected by the inertia and strength of the target material. The crater prediction equation of AZ31 B Mg alloy target under impact velocity of 5 km s^(-1) is given. The 2017 Al projectile completely melts in the Mg alloy target plate at the impact velocities of 3.8 km s^(-1) and 4.4 km s^(-1), and the microstructural evolution around the crater is: dynamic recrystallization zone, high-density twinning zone, low-density twinning zone, and Mg alloy matrix. It is found that the dynamic recrystallization, twinning and cracking are the main deformation behaviors for the AZ31 B Mg alloy to absorb the shock wave energy and release the stress generated by the hypervelocity impact. The main plastic deformation mechanisms of the Mg alloy target during hypervelocity impact are twinning and dislocation slip. Microstructure analysis shows the interactions of twins-twins, dislocations-dislocations, and twins-dislocations determine the strain hardening during the hypervelocity impact process, which eventually contributes the dynamic mechanical properties. The evolution of microhardness around the crater further demonstrates the microstructural evolutions and their interactions under the hypervelocity impacts.

关键词： AZ31B Mg alloy plate Hypervelocity impact Deformation behavior Shock wave propagation Microstructural evolution

^(1)H NMR tests on damaged and undamaged XLPE and SiR samples

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High Voltage 2019年第3期4卷 203-209页

作者： Lydia Gkoura Taiji Wang Athanasios Anastasiou Noureddine Harid Huw Griffiths Manu Haddad Michalis Fardis Marina Karayianni institute of nanoscience&Nanotechnology National Centre for Scientific Research(NCSR)DemokritosAthensGreece School of Chemical engineering National Technical University of AthensAthensGreece department of electrical and computer engineering Advanced Power and Energy Research CentreKhalifa UniversityAbu DhabiUnited Arab Emirates School of engineering Advanced High Voltage Engineering Research CentreCardiff UniversityCardiffUK

Cross-linked polyethylene(XLPE)and silicone rubber(SiR)samples were subjected to a high-voltage AC stress plane-plane configuration and inclined plane test,*** voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several *** stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance(NMR)***,^(1)H NMR spin-lattice(T_(1))and spin-spin(T_(2))relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR *** results show that there may be a moderate increase in the T_(1)and T_(2)values of the damaged samples in comparison with the undamaged *** raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.

关键词： XLPE rubber relaxation

A Wearable Multidimensional Motion Sensor for AI-Enhanced VR Sports

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Research 2023年第3期2023卷 105-115页

作者： Zi Hao Guo ZiXuan Zhang Kang An Tianyiyi He Zhongda Sun Xiong Pu Chengkuo Lee Beijing institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400People's Republic of China School of nanoscience and Technology University of Chinese Academy of SciencesBejing 100049People's Republic of China department of electrical and computer engineering National University of Singapore4 Engineering Drive 3Singapore 117576Singapore School of Mechanical and Materials engineering North China University of TechnologyBeijing 100144People's Republic of China

Regular exercise paves the way to a healthy ***,conventional sports events are susceptible to weather *** motion sensors for home-based sports are mainly limited by operation power consumption,single-direction sensitivity,or inferior data ***,by leveraging the 3-dimensional printing technique and triboelectric effect,a wearable self-powered multidimensional motion sensor has been developed to detect both the vertical and planar movement *** integrating with a belt,this sensor could be used to identify some low degree of freedom motions,e.g.,waist or gait motion,with a high accuracy of 93.8%.Furthermore,when wearing the sensor at the ankle position,signals generated from shank motions that contain more abundant information could also be effectively *** means of a deep learning algorithm,the kicking direction and force could be precisely differentiated with an accuracy of 97.5%.Toward practical application,a virtual reality-enabled fitness game and a shooting game were successfully *** work is believed to open up new insights for the development of future household sports or rehabilitation.

关键词： integrating printing Regular