Weidong Wang

Weidong Wang
Xidian University · School of Mechano-Electronic Engineering

PhD

About

121
Publications
23,467
Reads
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1,222
Citations
Citations since 2016
73 Research Items
1122 Citations
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Introduction
Weidong Wang currently works at the School of Mechano-Electronic Engineering, Xidian University, China. He has been as a visiting scholar at Rice University, USA, from 2009 to 2010, and a visiting scholar at Northwestern University, USA, from 2016 to 2017. His main research interests include MEMS/NEMS, nanomaterials and nanomechanics.
Additional affiliations
May 2016 - June 2017
Northwestern University
Position
  • Visting Scholar
July 2015 - present
Xidian University
Position
  • Professor
December 2014 - January 2015
City University of Hong Kong
Position
  • Senior Visiting Scholar
Education
September 2001 - June 2007
Xidian University
Field of study
August 2000 - March 2003
Xidian University
Field of study
August 1996 - July 2000
Xidian University
Field of study

Publications

Publications (121)
Article
Full-text available
A molecular dynamics study on nanoindentation experiments is carried out for some single-layer rectangular graphene films with four edges clamped. Typical load-displacement curves are obtained, and the effects of various factors including indenter radii, loading speeds, and aspect ratios of the graphene film on the simulation results are discussed....
Article
Molecular dynamics simulations on nanoindentation of circular monolayer molybdenum disulfide (MoS2) film are carried out to elucidate the deformation and failure mechanisms. Typical force-deflection curves are obtained, and in-plane stiffness of MoS2 is extracted according to a continuum mechanics model. The measured in-plane stiffness of monolayer...
Article
Flexible tactile sensors (FTS), which have been extensively used in force sensing devices, are gaining tremendous attentions in various application fields, such as robots, electronic skin (E-Skin), human-machine interaction (HMI), and many other rapidly developing frontier technologies. However, fabricating FTS achieving both high sensitivity and b...
Article
Significant efforts have been devoted to enhancing the sensitivity and working range of flexible pressure sensors to improve the precise measurement of subtle variations in pressure over a wide detection spectrum. However, achieving sensitivities exceeding 1000 kPa−1 while maintaining a pressure working range over 100 kPa is still challenging becau...
Article
Full-text available
China first in-situ lunar dust experiment is performed by a lunar dust detector in Chang’E-3 mission. The existed dust (less than 20 µm in diameter) properties, such as levitation, transportation and adhesion, are critical constraints for future lunar exploration program and even manned lunar exploration. Based on the problems discussed above, the...
Article
As a wireless basic unit, flexible antennas hold a wide range of applications in wearable electronics, soft robotics, and Things of Internet (IoT). However, most of the current flexible antennas are encapsulated by silicone elastomers with poor gas permeability, which severely hinders the evaporation of skin moisture and sweat. In addition, convent...
Article
Full-text available
Radial artery pulse pressure contains abundant cardiovascular physiological and pathological information, which plays an important role in clinical diagnosis of traditional Chinese medical science. However, many photoelectric sensors and pressure sensors will lose a large number of waveform features in monitoring pulse, which will make it difficult...
Article
Flexible piezoelectric sensors hold great promising for applications in electronic skin (E-skin), wearable devices, and biomedical devices. However, it is still challenging to apply flexible piezoelectric sensors to respiratory health monitoring which requires an extremely low detection limit. To address this challenge, a flexible bionic piezoelect...
Article
Reducing lunar dust adhesion to various material surfaces is important for protecting equipment from damage during lunar exploration missions. In this study, we investigate the lunar dust-mitigation ability and dust adhesion force of aluminum (Al) substrates prepared using different etching methods. Among them, composite etching methods (combining...
Article
Flexible pressure sensors hold great potential for applications in human–machine interaction and flexible robotics, but the balance of their sensitivity and sensing range remains a challenge. Here, we proposed a flexible piezoresistive pressure sensor based on poly (3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT: PSS) and cross inte...
Article
Flexible sensors with proximity and tactile sensing have attracted great interest in electronic skins (E-skin), human-machine interfaces (HMI), and soft robotics. However, it remains challenging to have both proximity and haptic sensing ability in one flexible device, yet enable wireless sensing. Here, based on the edge electric field and piezo-cap...
Article
The high demand for flexible force sensors with both strain and pressure sensing has attracted considerable attention for various application scenarios, such as electronic skins and smart prostheses. However, successful application of these sensors in real-world is challenging because the performance of the sensors can be severely degraded under ap...
Article
Full-text available
Flexible pressure sensors play an important role in flexible robotics, human-machine interaction (HMI), and human physiological information. However, most of the reported flexible pressure sensors suffer from a highly nonlinear response and a significant decrease in sensitivity at high pressures. Herein, we propose a flexible novel iontronic pressu...
Article
As a representative of immiscible alloy systems, the Cu-Ta system was the research topic because of its potential application in industry, military and defense fields. In this study, an amorphous Cu-Ta alloy film was manufactured through magnetron sputter deposition, which was characterized by scanning electron microscopy (SEM) and transmission ele...
Article
Full-text available
As a typical type of MEMS acceleration sensor, the inertial switch can alter its on-off state while the environmental accelerations satisfy threshold value. An exhaustive summary of the design concept, performance aspects, and fabrication methods of the micro electromechanical system (MEMS) inertial switch is provided. Different MEMS inertial switc...
Article
Nature materials usually possess unique hierarchical structures, like spongy bone, tendon and bamboo, and often exhibit remarkable mechanical properties. In this paper, inspired by the structural hierarchy of biological materials, the novel configuration design of unit cell with inner hierarchy was developed. The new lattice configuration takes adv...
Article
Investigation on the adhesion effect of lunar dust particles on contacting interface improves in lunar dust protection and prolongs the equipment service life. In this work, the contact mathematical adhesion model between an ultra-fine lunar dust particle and the aluminum-based rough surface is established based on the fractal theory. The research...
Article
Full-text available
Highlights The iontronic pressure sensor achieved an ultrahigh sensitivity ( S min > 200 kPa ⁻¹ , S max > 45,000 kPa ⁻¹ ). The iontronic pressure sensor exhibited a broad sensing range of over 1.4 MPa. Pseudocapacitive iontronic pressure sensor using MXene was proposed. ABSTRACT Flexible pressure sensors are unprecedentedly studied on monitoring h...
Article
Full-text available
In this paper, an inverse method is proposed for measuring the elastoplastic properties of metallic materials using a spherical indentation experiment. In the new method, the elastoplastic parameters are correlated with sub-space coordinates of indentation imprints using proper orthogonal decomposition (POD), and inverse identification of material...
Article
Full-text available
Monitoring biophysical signals such as body or organ movements and other physical phenomena is necessary for patient rehabilitation. However, stretchable flexible pressure sensors with high sensitivity and a broad range that can meet these requirements are still lacking. Herein, we successfully monitored various vital biophysical features and imple...
Article
The omnipresent ultralow-frequency vibrations and swings contain a huge amount of mechanical energy, but the low harvesting efficiency hinders their application as a practical power source. To address this issue, this paper reports an innovative eccentric mass-driven rotor (EMDR) that is capable of transforming ultralow-frequency excitations to uni...
Article
Optical position encoders have been invented and investigated for several decades for precision measurement. In this article, a comprehensive survey on the optical position encoders, from two aspects of industrial products and academic instruments, is presented. The technical background of the optical position encoder is introduced, and the popular...
Article
Full-text available
When the lander approaches the lunar surface, the rocket exhaust will erode the surface and eject massive high-speed dust, which could damage the payloads on the lander or interfere with subsequent surface operations. This process also provides a unique opportunity to study the plume-dust interaction and the wind erosion on the surface of airless b...
Article
This paper presents an inverse computation method for measuring the anisotropic plasticity properties of materials using indentation. The advantage of this method is that, material plastic parameters are treated as stochastic variables with statistical distributions, of which potential uncertainties in numerical optimization process are considered....
Article
Full-text available
An in situ coupling approach is used to fabricate the porous carbon liquid with permanent porosity by directly dispersing hollow carbon nanospheres in polymerized ionic liquids. It is a kind of homogenous and stable type III porous liquid at room temperature. Because of the well‐preserved permanent porosity, this unique porous carbon liquid is capa...
Article
Rotational motions are generally enabled by the flow energy for generating electricity or by the electric energy to drive various mechanical motions. Here, we report a fundamentally different approach (which we name “semi-flexible rotor”) that uses omnipresent ultralow-frequency (<5 Hz) vibrations as the energy source to achieve high-speed rotation...
Article
Based on a bistable mechanism, a novel low- ${g}$ MEMS inertial switch with dual functions of self-locking and reverse-unlocking is presented, along with its fabrication and verification. This MEMS switch is fabricated on a Silicon-On-Insulator (SOI) wafer by using deep reactive ion etching (DRIE), Bosch processing, and wafer bonding technologies....
Article
Full-text available
The laser-engraved method was introduced to fabricate the electrode for the sensor.The sensor showed a wide linear working range, superior sensitivity, and fast response time and also exhibited excellent viability in a wet situation.Wireless integrated network sensors successfully monitored the health states. The laser-engraved method was introduce...
Article
Full-text available
Flexible transparent conductive films are indispensable for nowadays wearable electronic devices with various applications. However, existing solutions such as ITO and metal mesh were limited by their poor intrinsic stretching ability. In this work, we designed and fabricated silver nanowires (AgNWs) on graphene hybrid films for enhanced mechanical...
Article
Full-text available
Background The study on explosive boiling phenomenon has received increasing attention because it involves many industries, such as advanced micro-, nano-electromechanical and nano-electronic cooling systems, laser steam cleaning and so on. Objective In present work, the explosive boiling of ultra-thin liquid film over two-dimensional nanomaterial...
Article
Full-text available
Atomic simulations give a good explanation of the changes in the physical properties of a material. In this work, the tension behaviors of nanopolycrystalline Cu–Ta alloys are investigated through molecular dynamics (MD) simulations, and the influences of several important factors on the mechanical properties of the materials are studied. Firstly,...
Article
Flexible sensor with superior sensitivity and widened working range is urgently demanded to cater for the rapid progress of wearable electronics and mechnosensational human-machine interfaces. However, the manufacturing of the wearable sensor with promising sensitivity in a broad working range is a challenge for the soft property of the sensing mat...
Conference Paper
Full-text available
The study of nanocrystalline(NC) polycrystals is a hot topic, and the study of nanomaterial properties by molecular dynamics has become the first choice for many researchers. The purpose of this paper is to simulate the tensile tests of single and polycrystalline tantalum by molecular dynamics(MD) to obtain its mechanical properties. Firstly, the R...
Conference Paper
Full-text available
The lipid bilayer membrane is a major component of cells and intracellular membranes in vivo, and plays an indispensable role in organisms. Currently in the medical field, lipid bilayer membranes are used as devices for targeted delivery of proteins, nucleic acids and drugs in the treatment of a variety of diseases. Based on coarse-grained molecula...
Article
A highly sensitive portable piezoresistive sensor with a fast response-time in an extended linear working range is urgently needed to meet the rapid development of the artificial intelligence (AI), interactive human–machine interface and ubiquitous flexible-electronics. However, it is a challenge to rationally couple these figure-of-merits (sensiti...
Article
Full-text available
A molecular dynamics (MD) study is carried out to reveal the phenomenon about the normal and explosive boiling of ultra-thin liquid argon film absorbed on MoS2 surface with different wetting conditions. The three-phase molecular system is composed of a solid MoS2 wall, a liquid argon film and a vapour argon region. Initially, the three-phase simula...
Article
Flexible fiber-shaped supercapacitors (FFSSs) hold promising prospect to meet the increasingly high requirements of the wearable electronics. However, today it remains a great challenge to construct advanced supercapacitor with high areal capacity and favorable rate capability to achieve superior energy density in facile route is a great challenge....
Article
The uniformity of substrate temperature is an important factor to be considered in the design of microchannel heat sink which has been widely used in the micro-channel reactors, electric chip cooling and various type fuel cells. Therefore, two novel annular microchannel heat sink designs are proposed to improve the flow distribution and substrate t...
Article
Full-text available
Atomistic simulations are capable of providing insights into physical mechanisms responsible for mechanical properties of the transition metal of Tantalum (Ta). By using molecular dynamics (MD) method, temperature and pressure dependences of the elastic properties of Ta single crystals are investigated through <100> tensile loading. First of all, a...
Article
Full-text available
In the original publication of this article [1] the third author was typesetted by mistake. The correct name of the third author should be Kang-qi Fan. The publisher apologizes to the readers and authors for the inconvenience. The original publication has been corrected.
Article
A bi-directional hybrid energy harvester (HEH) is presented in this paper to scavenge energy from ultra-low frequency mechanical excitations. The proposed HEH consists of two piezoelectric cantilever beams, a suspended magnet, and a set of coil. Specifically, the two piezoelectric beams work as a conventional piezoelectric energy harvester (PEH), w...
Article
Full-text available
The single-layer molybdenum disulfide (SLMoS2) nanosheets have been experimentally discovered to exist in two different polymorphs, which exhibit different electrical properties, metallic or semiconducting. Herein, molecular dynamics (MD) simulations of nanoindentation and uniaxial compression were conducted to investigate the phase transition of S...
Article
Capturing mechanical energy from our living environment is an effective approach for implementing self-sustained electronics. One of the key challenges is how to generate more electricity from the low-frequency and multi-directional excitations. To address this interesting issue, this paper reports a hybrid energy harvester (HEH) that consists of a...
Article
Full-text available
Based on the density functional theory (DFT), the electronic properties of O-doped pure and sulfur vacancy-defect monolayer WS2 are investigated by using the first-principles method. For the O-doped pure monolayer WS2, four sizes (2 × 2 × 1, 3 × 3 × 1, 4 × 4 × 1 and 5 × 5 × 1) of supercell are discussed to probe the effects of O doping concentratio...
Article
Full-text available
Monolayer molybdenum disulfide (MoS₂) has obtained much attention recently and is expected to be widely used in flexible electronic devices. Due to inevitable bending in flexible electronic devices, the structural and electronic properties would be influenced by tensile strains. Based on the density functional theory (DFT), the structural and elect...
Chapter
Full-text available
The single-layer molybdenum disulfide (SLMoS2) belongs to a graphene-like layered two-dimensional (2D) nanocrystal, consisting of S-Mo-S sandwich structure. The pristine SLMoS2 holds unique properties due to its intrinsic direct bandgap of ~1.8 eV and high elastic modulus of ~0.2 TPa, which attracts extensive applications on 2D nanodevices. Since L...
Article
Transition metal dichalcogenides (TMDs) have attracted considerable interest for exploration of next-generation electronics and optoelectronics in recent years. Fabrication of in-plane lateral heterostructures between TMDs has opened up excellent opportunities for engineering two-dimensional materials. The creation of high quality heterostructures...