Article
Materials Science, Multidisciplinary
Dan Zhao, Rui Liu, Cheng Luo, Yang Guo, Chengyi Hou, Qinghong Zhang, Yaogang Li, Wei Jia, Hongzhi Wang
Summary: The study focuses on the in-situ assembly of carbon nanotubes (CNTs) using macroscopic dielectrophoresis, overcoming the limitation of small size in traditional manipulation methods. Through optimizing voltage and frequency, ordered CNTs chains can be obtained under the action of alternating current dielectrophoresis, which can restore immediately upon powering up after being damaged. Different conductive patterns on non-woven fabric can be achieved by controlling the position of the electrodes in a wet environment.
ADVANCED FIBER MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Heather G. Wise, Hidemasa Takana, Anthony B. Dichiara
Summary: The continuous flow assembly of colloidal nanoparticles from aqueous suspensions into macroscopic materials using a field-assisted double flow focusing system allows the integration of renewable cellulose nanofibrils (CNFs) with single-walled carbon nanotubes (SWNTs) to produce high-performance functional filament nanocomposites. The nanoscale orientational anisotropy of the CNFs and SWNTs is achieved by an alternating electric field and extensional sheath flows. The resulting macroscopic filaments exhibit improved mechanical, electrical, and liquid sensing properties, showing promise for environmentally friendly and scalable manufacturing of multifunctional fibers.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Masafumi Inaba, Takenori Oda, Masaki Kono, Nisarut Phansiri, Takahiro Morita, Shota Nakahara, Michihiko Nakano, Junya Suehiro
Summary: The study fabricated CNT/SnO2 heterojunction gas sensors using one-step dielectrophoretic assembly and investigated the effect of CNT/SnO2 ratio on gas detection properties. The results showed that the UV-irradiated CNT/SnO2 heterojunction gas sensor had a high response to 1 ppm NO2 in artificial air.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Shitao Shen, Xiaofeng Qin, Haoqiang Feng, Shuting Xie, Zichuan Yi, Mingliang Jin, Guofu Zhou, Eser Metin Akinoglu, Paul Mulvaney, Lingling Shui
Summary: In this paper, an electromicrofluidic assembly platform (eMAP) is proposed and validated for achieving 3D colloidal assembly within water droplets. By using dielectrophoresis and (di)electrowetting effects, reconfigurable colloidal configurations can be observed and dynamically programmed. This platform allows designable chemical and physical anisotropies for functional materials and devices, and enables high throughput mass production of microcapsules and optoelectronic units.
Article
Biochemical Research Methods
Abdullah Abdulhameed, Mohd Nazim Mohtar, Mohd Nizar Hamidon, Izhal Abdul Halin
Summary: The study validates a novel DEP setup that reduces the medium drag velocity by using a top glass cover, addressing issues with CNT assembly on large-scale electrode structures. Experimental results show successful assembly and alignment of CNT bridges on ITO electrodes, along with deriving an equation for optimizing CNT concentration. The deposition of long CNTs on ITO electrodes has potential applications in transparent electronics and microfluidic systems.
Article
Chemistry, Analytical
Joevonte Kimbrough, Lauren Williams, Qunying Yuan, Zhigang Xiao
Summary: This study successfully fabricated carbon nanotube field-effect transistors on a wafer scale using dielectrophoresis method, and tested their performance. It was found that 87% of the fabricated CNTFETs were functional, with 30% having an I-DS on/off ratio larger than 20 and 70% having a ratio lower than 20. The research provides an effective method for the wafer-scale fabrication of CNT electronic devices.
Article
Chemistry, Multidisciplinary
Gaurav Anand, Samira Safaripour, Craig Snoeyink
Summary: This study presents a novel non-electrophoretic, electric field-based separation mechanism that can transport ions based on their dielectric properties. While similar to dielectrophoresis, this polarization-based mechanism is remarkably more efficient at small length scales compared to any dielectrophoretic separation mechanism for particles. The concentration change of the working solute, sodium fluorescein, is shown to decrease by approximately 20% in an electric field region compared to a non-electric field region with an applied electric field strength as low as 0.75 MV m(-1) across a 100 μm channel. Existing macroscopic theoretical models such as electrohydrodynamics and equilibrium thermodynamics underestimate the concentration change by two orders of magnitude for the same electric field strength, suggesting a missing key physics in the electric field-based equilibrium thermodynamic model.
Article
Chemistry, Physical
Wenshan Li, Frank Hennrich, Benjamin S. Flavel, Simone Dehm, Manfred Kappes, Ralph Krupke
Summary: Dielectrophoresis (DEP) describes the motion of suspended objects in an inhomogeneous electric field. Researchers have extensively studied DEP in aqueous and organic solutions, with recent applications focused on polymer-wrapped single-walled carbon nanotubes (SWCNTs) in organic solvents due to the availability of ultra-pure SWCNT content.
Article
Thermodynamics
Hao Dang, Dongxing Song, Zizhen Lin, Meng An, Weigang Ma, Xing Zhang
Summary: This study proposes a strategy to enhance the thermophoresis of confined nano-liquid using an external electric field, and demonstrates its feasibility through molecular dynamics simulation. The work has great potential applications in seawater desalination, cellular uptake and drug carrier, and nanofiltration membranes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Hideki Sato, Masatoshi Hiromura
Summary: This study demonstrates the self-assembly formation of dense carbon nanotube (CNT) filaments using gas discharge breakdown. The detachment of CNTs from a CNT mat on the cathode caused by ion irradiation triggers the reassembly of CNT filaments. The characteristics of CNT filament formation were influenced by the discharge gas pressure and were significantly enhanced by the addition of a collection electrode.
Article
Engineering, Electrical & Electronic
Abdullah Abdulhameed, Izhal Abdul Halin, Mohd Nazim Mohtar, Mohd Nizar Hamidon
Summary: This study investigates the effects of electrode geometry on the dielectrophoretic assembly of multi-walled carbon nanotube bundles. A computational model is used to predict the motion and assembly location of the bundles, and experimental work is conducted to validate the simulation results. The density and shape of the assembled bundles are controlled by optimizing the electrode dimensions and adjusting the AC signal parameters.
JOURNAL OF ELECTROSTATICS
(2022)
Review
Engineering, Biomedical
Eduardo Anaya-Plaza, Ahmed Shaukat, Inka Lehtonen, Mauri A. Kostiainen
Summary: The strategy of combining biomolecules and synthetic components to develop biohybrids is becoming increasingly popular for preparing highly customized and biocompatible functional materials， allowing the excellent properties of carbon nanotubes (CNTs) to be applied to biomedical applications. The resulting well-defined composites of CNTs conjugated with relevant biomolecules enable the exploitation of nanoscale properties at the micro- and macroscale, with potential applications in tissue engineering, sensors, and wearable electronics. This review presents the underlying chemistry behind the CNT-based biohybrid materials and discusses the future directions of the field.
ADVANCED HEALTHCARE MATERIALS
(2021)
Article
Chemistry, Analytical
Tuo Zhou, Matthew Michaels, Lawrence Kulinsky
Summary: A novel method of electrode healing using electrokinetically assembled carbon nanotube (CNT) bridges is presented in this research, with conductive bridges successfully assembled across electrode gaps ranging from 20 microns to well over 170 microns. This work represents a significant milestone in expanding the length of electrically conductive CNT bridges and fixing them with electrodeposited polypyrrole.
Review
Environmental Sciences
Drisya G. Chandran, Loganathan Muruganandam, Rima Biswas
Summary: The contamination of water sources is accelerating due to the rapid growth in world population, industrialization, and urbanization. This poses a major concern as the non-biodegradable heavy metals in waterways disrupt the ecological balance. The removal of heavy metals from water has become increasingly important, with adsorption techniques using novel adsorbents like carbon nanomaterials attracting attention. This review paper focuses on the fundamental concepts, structures, and unique surface properties of these adsorbents, as well as the negative effects of heavy metals and the adsorption mechanism. It also discusses the current research status of sustainable wastewater treatment, the applications and adsorption capacity of carbon nanomaterials, functionalized carbon nanotubes, graphene, and graphene oxide, and the use of MD simulations and density functional theory (DFT) for heavy metal removal. Additionally, it addresses the influence of factors such as electric field and pressure on heavy metal adsorption.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
X. W. Meng, X. Kang
Summary: Water transport through a single-walled carbon nanotube (SWCNT) with a small nanogap under a vertical electric field is studied using molecular dynamics simulations. The results show that the water transfer rate and properties in the SWCNT with a nanogap change with increasing electric field. This study is of importance for the design of energy-saving devices.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Cedric Fischer, Thomas Quirin, Christophe Chautems, Quentin Boehler, Joris Pascal, Bradley J. Nelson
Summary: Remote magnetic navigation (RMN) allows for precise and accurate wireless steering of magnetic catheters through complex structures. This study proposes a localization method that uses multiple Hall sensors to measure the magnetic fields produced by the magnetic navigation systems (MNSs) and estimate the full sensor pose. The results provide insights into the minimal requirements for an MNS in terms of localization accuracy.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Chemistry, Multidisciplinary
Wenqi Zhang, Peidong Chao, Donglei Chen, Zhan Yang, Lixin Dong
Summary: A hybrid core-shell structured nanowire is proposed for a long-term stable electron source based on an isolated platinum/multi-walled carbon nanotube (Pt/MWCNT). The hybrid nanowire is prepared by growing a Pt shell on a metallic MWCNT through a field-emission-induced deposition (FEID) method. It demonstrates good stability and tolerance to poor working conditions, with a lifetime hundreds of times longer than that of the pristine bare MWCNT.
Article
Nanoscience & Nanotechnology
Chunyang Li, Lu Li, Fanqing Zhang, Zhongyi Li, Wenfu Zhu, Lixin Dong, Jing Zhao
Summary: In this paper, a high-performance FeFET based on monolayer MoS2 coupled with C60 doped ferroelectric copolymer P(VDF-TrFE) is proposed. The inserted C60 molecules enhance the alignment of dipoles effectively at low voltage, allowing the modified device to demonstrate large memory window, high current on/off ratio, long retention time, and remarkable endurance. In addition, in situ logic application can be realized by constructing facile device interconnection without building complex complementary semiconductor circuits. The results of this study are expected to pave the way for future low consumption computing-in-memory applications based on high-quality 2D FeFETs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Chaojian Hou, Kun Wang, Wenqi Zhang, Donglei Chen, Xiaokai Wang, Lu Fan, Chunyang Li, Jing Zhao, Lixin Dong
Summary: The current state-of-the-art in situ transmission electron microscopy (TEM) characterization technology can manipulate specimens at the nanoscale and provide atom-level material attributes. However, there is a barrier between material attributes investigations and device-level application explorations due to immature in situ TEM manufacturing technology and sufficient external stimuli. This study proposes an in situ opto-electromechanical TEM characterization platform by integrating an ultra-flexible micro-cantilever chip with optical, mechanical, and electrical coupling fields. The platform enables static and dynamic in situ device-level TEM characterizations using molybdenum disulfide (MoS2) as the channel material. The experiments demonstrate electron-beam modulation behavior and bending of MoS2 nanodevices, revealing piezoresistive and opto-electromechanical coupling properties. Real-time atom-level characterization is achieved using this approach, providing a step towards advanced in situ device-level TEM characterization technology.
ADVANCED MATERIALS
(2023)
Article
Robotics
Quentin Boehler, Simone Gervasoni, Samuel L. Charreyron, Christophe Chautems, Bradley J. Nelson
Summary: This article discusses the use of magnetic navigation systems in remote magnetic navigation to steer magnetic objects. The design, workspace definition, measurement methodology, and evaluation metrics of these systems are explored and illustrated with examples.
IEEE TRANSACTIONS ON ROBOTICS
(2023)
Article
Computer Science, Information Systems
Jiaen Wu, Barna Becsek, Alessandro Schaer, Henrik Maurenbrecher, George Chatzipirpiridis, Olgac Ergeneman, Salvador Pane, Hamdi Torun, Bradley J. Nelson
Summary: A novel algorithm based on reduced support vector machine (RSVM) and finite state machine (FSM) is developed for real-time and reliable detection of gait phases. The algorithm is implemented on a microcontroller of a wearable device and evaluates its performance with healthy subjects, showing promising real-time performance and robustness.
IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS
(2023)
Article
Chemistry, Physical
Kun Wang, Chaojian Hou, Longqing Cong, Wenqi Zhang, Lu Fan, Xiaokai Wang, Lixin Dong
Summary: Expanding micro-/nanostructures into 3D ones not only boosts structural integration level and enhances device functionality, but also enables the development of parallel microrobots and adaptive 3D micro-antennas. This study proposes a synergetic 3D micro-/nanoshape transformation technique, rolling-up kirigami, combining kirigami and rolling-up techniques. The dynamic rolling-up process allows for mutual competition and cooperation among flabella, and the translated-rotated conversion offers a platform for developing tunable devices.
Article
Physics, Applied
Muhammad Zubair, Yi Dong, Bin Cai, Xiao Fu, Hailu Wang, Tangxin Li, Jinjin Wang, Shuning Liu, Mengjia Xia, Qixiao Zhao, Runzhang Xie, Hangyu Xu, Xiaoyong Jiang, Shuhong Hu, Bo Song, Xiaolong Chen, Jiadong Zhou, Lixin Dong, Jinshui Miao
Summary: This study reports nonvolatile floating gate photo-memory devices based on ReS2/h-BN/SnS2 van der Waals heterostructures, which exhibit a large memory window, a high program/erase current ratio, excellent retention characteristics, and the ability to achieve multi-bit information storage. Pulsed laser illumination allows for obtaining multiple photo-memory states. Additionally, a neuromorphic computing network is constructed based on these devices with high recognition accuracy. This work paves the way for miniaturization and high-density integration of future optoelectronics for neuromorphic hardware applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Zhongyi Li, Kun Wang, Chaojian Hou, Chunyang Li, Fanqing Zhang, Wu Ren, Lixin Dong, Jing Zhao
Summary: This article introduces a novel artificial intelligence (AI) microrobot that can respond to changes in the external environment without an onboard energy supply and transmit signals wirelessly in real time. It can enhance the local radiofrequency (RF) magnetic field and achieve a large penetration sensing depth and high spatial resolution. The research is of great significance for early disease discovery and accurate diagnosis, and has the potential for large-scale production of functional microrobots.
MICROSYSTEMS & NANOENGINEERING
(2023)
Editorial Material
Robotics
Bradley J. Nelson
Article
Engineering, Electrical & Electronic
Wenqi Zhang, Donglei Chen, Chaojian Hou, Shuideng Wang, Kun Wang, Lixin Dong
Summary: A joint nanorobotic manipulation system connecting a scanning electron microscope and a spherical aberration-corrected transmission electron microscope is proposed for nanofabrication and structure construction. Experimental results demonstrate the system's ultrahigh precision and cost efficiency, indicating a new trend for nanorobotic manipulation.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Hailu Wang, Yi Dong, Xiao Fu, Xuezhi Zhao, Qixiao Zhao, Mengjia Xia, Mengyang Kang, Chaoyu Zhao, Zhihao Xu, Yicheng Zhu, Liang Gao, Jiang Tang, Lixin Dong, Jinshui Miao, Weida Hu
Summary: This research proposes a novel short-wave infrared photodetector utilizing solution-processed colloidal quantum dots as the absorber material, combined with zinc oxide and lead sulfide. The photodiode exhibits a broad short-circuit photocurrent response and high linear dynamic range, indicating its potential for large-scale fabrication of infrared focal plane arrays.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Joaquin Llacer-Wintle, Jan Renz, Lukas Hertle, Andrea Veciana, Denis von Arx, Jiang Wu, Pere Bruna, Marija Vukomanovic, Josep Puigmarti-Luis, Bradley J. Nelson, Xiang-Zhong Chen, Salvador Pane
Summary: Magnetoelectricity allows solid-state materials to generate electricity under magnetic fields. A new magnetopyroelectric (MPE) effect is demonstrated in nanostructured composites of magnetic and pyroelectric materials. The composites consist of magnetic iron oxide nanoparticles dispersed in a ferroelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) matrix. This new approach provides an opportunity to develop magnetoelectric materials for various applications.
MATERIALS HORIZONS
(2023)
Article
Automation & Control Systems
Zejie Yu, Kun Wang, Chaojian Hou, Donglei Chen, Shuideng Wang, Wenqi Zhang, Zhi Qu, Xiaokai Wang, Lixin Dong
Summary: A memsensor, designed as a sensor with/in memory, can work in a passive mode, making it suitable for environments where a local/onboard power supply is not available. In this report, molybdenum disulfide (MoS2) memsensors are integrated on microrobots for hydrogen peroxide (H2O2) detection in a passive mode. The sensors have a crossbar configuration and are microfabricated with Au/MoS2/Au. The proposed calibration and sensing method show an acceptable resolution of 200 nmol/L to 2 mu mol/L.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Materials Science, Multidisciplinary
Ran Cai, Lixia Bao, Wenqi Zhang, Weiwei Xia, Chunhao Sun, Weikang Dong, Xiaoxue Chang, Ze Hua, Ruiwen Shao, Toshio Fukuda, Zhefei Sun, Haodong Liu, Qiaobao Zhang, Feng Xu, Lixin Dong
Summary: This study reveals, for the first time, the potassiation/depotassiation mechanisms of tetragonal FeSe nanoflakes in potassium-ion batteries through in situ high-resolution transmission electron microscopy. It is found that the intercalation behavior and structural evolutions differ among nanoflakes of different sizes. Small-sized nanoflakes exhibit better cycling performance with well-maintained structural integrity.
