A5002477721- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Force Microscopy Techniques and Applications
- Tactile and Sensory Interactions
- Advanced Materials and Mechanics
- Nanomaterials and Printing Technologies
- Nanowire Synthesis and Applications
- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Metal and Thin Film Mechanics
- Microstructure and mechanical properties
- Muscle activation and electromyography studies
- Gas Sensing Nanomaterials and Sensors
- Carbon Nanotubes in Composites
- Graphene research and applications
- EEG and Brain-Computer Interfaces
- ZnO doping and properties
- Advanced Fiber Optic Sensors
- Neuroscience and Neural Engineering
- Advanced Surface Polishing Techniques
- Non-Invasive Vital Sign Monitoring
- Advanced ceramic materials synthesis
- Surface Modification and Superhydrophobicity
- Acoustic Wave Resonator Technologies
- Aluminum Alloys Composites Properties
North Carolina State University
2016-2025
North Central State College
2014-2024
Fuyang Normal University
2015-2024
Chinese Academy of Medical Sciences & Peking Union Medical College
2024
University of North Carolina at Chapel Hill
2015-2023
Jinan University
2008-2023
Southern University of Science and Technology
2023
Chongqing University
2014-2023
Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality
2021-2022
Shanghai Pulmonary Hospital
2017
A highly conductive and stretchable conductor with silver nanowires (AgNWs) embedded just below the surface of poly(dimethylsiloxane) (PDMS) is fabricated. Stable conductivity 5285 S cm−1 achieved in a large range tensile strain (0–50%) after few cycles stretching/releasing substrate. This stable electric response due to buckling AgNW/PDMS thin layer, which attributed irreversible sliding AgNWs PDMS matrix. can be printed fabricate patterned conductors feature size as small 50 μm.
Considerable efforts have been made to achieve highly sensitive and wearable sensors that can simultaneously detect multiple stimuli such as stretch, pressure, temperature or touch. Here we develop stretchable multifunctional strain (up 50%), pressure ∼1.2 MPa) finger touch with high sensitivity, fast response time (∼40 ms) good mapping function. The reported utilize the capacitive sensing mechanism, where silver nanowires are used electrodes (conductors) Ecoflex is a dielectric. nanowire...
Stretchable electronics are attracting intensive attention due to their promising applications in many areas where electronic devices undergo large deformation and/or form intimate contact with curvilinear surfaces. On the other hand, a plethora of nanomaterials outstanding properties have emerged over past decades. The understanding nanoscale phenomena, materials, and has progressed point substantial strides nanomaterial-enabled become realistic. This review summarizes recent advances one...
The transfer of synthesized 2D MoS2 films is important for fundamental and applied research. However, it problematic to translate the well-established processes graphene due different growth mechanisms surface properties. Here we demonstrate a surface-energy-assisted process that can perfectly centimeter-scale monolayer few-layer from original substrates onto arbitrary with no observable wrinkles, cracks, polymer residues. unique strategies used in this include leveraging penetration water...
The Young's modulus and fracture strength of silicon nanowires with diameters between 15 60 nm lengths 1.5 4.3 mum were measured. nanowires, grown by the vapor-liquid-solid process, subjected to tensile tests in situ inside a scanning electron microscope. decreased while increased up 12.2 GPa, as nanowire diameter decreased. also decrease side surface area; increase rate for chemically synthesized was found be much higher than that microfabricated thin films. Repeated loading unloading...
We report the development of a material testing system for in situ electron microscopy (EM) mechanical nanostructures. The consists an actuator and load sensor fabricated by means surface micromachining. This previously undescribed nanoscale makes possible continuous observation specimen deformation failure with subnanometer resolution, while simultaneously measuring applied electronically nanonewton resolution. achievement was made integration electromechanical thermomechanical components...
This paper reports the quantitative measurement of a full spectrum mechanical properties fivefold twinned silver (Ag) nanowires (NWs), including Young's modulus, yield strength, and ultimate tensile strength. In-situ testing Ag NWs with diameters between 34 130 nm was carried out inside scanning electron microscope (SEM). strength all increased as NW diameter decreased. The maximum in our tests found to be 2.64 GPa, which is about 50 times bulk value close theoretical...
We demonstrate a class of microstrip patch antennas that are stretchable, mechanically tunable, and reversibly deformable. The radiating element the antenna consists highly conductive stretchable material with screen-printed silver nanowires embedded in surface layer an elastomeric substrate. A 3-GHz 6-GHz 2-element array fabricated. Radiating properties characterized under tensile strain agree well simulation results. is reconfigurable because resonant frequency function applied strain....
The nonlinear mechanical response of monolayer graphene on polyethylene terephthalate (PET) is characterised using in‐situ Raman spectroscopy and atomic force microscopy. While interfacial stress transfer leads to tension in as the PET substrate stretched, retraction during unloading imposes compression graphene. Two failure mechanisms, shear sliding under buckling compression, are identified. Using a shear‐lag model, strength found range between 0.46 0.69 MPa. critical strain for onset...
A glucose-responsive closed-loop insulin delivery system mimicking pancreas activity without long-term side effect has the potential to improve diabetic patients' health and quality of life. Here, we developed a novel device using painless microneedle-array patch containing insulin-loaded vesicles. Formed by self-assembly hypoxia H2O2 dual-sensitive diblock copolymer, polymersome-based vesicles (d-GRPs) can disassociate subsequently release triggered generated during glucose oxidation...
Abstract Wavy ribbons of carbon nanotubes (CNTs) are embedded in elastomeric substrates to fabricate stretchable conductors that exhibit excellent performance terms high stretchability and small resistance change. A CNT ribbon with a thin layer sputtered Au/Pd film is transferred onto prestrained poly(dimethylsiloxane) (PDMS) substrate buckled out‐of‐plane upon release the prestrain. Embedded PDMS, wavy able accommodate large stretching (up prestrain) little change resistance. For prestrain...
We present gas-permeable, ultrathin, and stretchable electrodes enabled by self-assembled porous substrates conductive nanostructures. An efficient scalable breath figure method is employed to introduce the skeleton, then silver nanowires (AgNWs) are dip-coated heat-pressed offer electric conductivity. The resulting film has a transmittance of 61%, sheet resistance 7.3 Ω/sq, water vapor permeability 23 mg cm–2 h–1. With AgNWs embedded below surface polymer, electrode exhibits excellent...
High-resolution, large-scale printing of highly conductive AgNWs for flexible and stretchable electronics using EHD is presented. The printed patterns show the smallest line width 45 μm electrical conductivity as high ∼5.6 × 10<sup>6</sup>S m<sup>−1</sup>. AgNW-based wearable heaters ECG electrodes are fabricated.
Mechanical force-based stimulus provides a simple and easily accessible manner for spatiotemporally controlled drug delivery. Here we describe wearable, tensile strain-triggered delivery device consisting of stretchable elastomer microgel depots containing loaded nanoparticles. By applying strain to the film, release from microdepot is promoted due enlarged surface area diffusion Poisson's ratio-induced compression on microdepot. Correspondingly, both sustained by daily body motions...
We present wearable dry electrodes made of silver nanowires for long-term electrophysiological sensing such as electrocardiography and electromyography.
A wearable skin hydration sensor in the form of a capacitor is demonstrated based on impedance measurement. The consists two interdigitated or parallel electrodes that are made silver nanowires (AgNWs) polydimethylsiloxane (PDMS) matrix. flexible and stretchable nature AgNW/PDMS electrode allows conformal contact to skin. insensitive external humidity change calibrated against commercial system an artificial over wide range. packaged into wristband, together with network analyzer chip,...
We present our efforts toward enabling a wearable sensor system that allows for the correlation of individual environmental exposures with physiologic and subsequent adverse health responses. This will permit better understanding impact increased ozone levels other pollutants on chronic asthma conditions. discuss inefficiency existing commercial off-the-shelf components to achieve continuous monitoring system-level nano-enabled improving wearability power consumption. Our consists wristband,...
This article provides the latest advances from NSF Advanced Self-powered Systems of Integrated sensors and Technologies (ASSIST) center. The work in center addresses key challenges wearable health environmental systems by exploring technologies that enable ultra-long battery lifetime, user comfort wearability, robust medically validated sensor data with value added multimodal sensing, access to open architecture streams. vison ASSIST is use nanotechnology build miniature, self-powered,...
A compact and flexible circularly polarized (CP) wearable antenna is introduced for wireless body-area network systems at the 2.4 GHz industrial, scientific, medical (ISM) band, which implemented by employing a low-loss composite of polydimethylsiloxane (PDMS) silver nanowires (AgNWs). The radiation enabled placing planar linearly loop monopole above finite anisotropic artificial ground plane. By truncating plane to contain only 2 unit cells, an integrated with form factor 0.41λ0 × 0.045λ0...
Body temperature is an important indicator of the health condition. It critical importance to develop a smart sensor for wearable applications. Silver nanowire (AgNW) promising conductive material developing flexible and stretchable electrodes. Here, breathable thermoresistive based on AgNW composites developed, where percolation network encased in thin polyimide film. The coefficient resistance tailored by modifying density thermal annealing temperature. patterned with Kirigami structure,...