A5005198509- Carbon Nanotubes in Composites
- Graphene research and applications
- Diamond and Carbon-based Materials Research
- Advancements in Battery Materials
- Semiconductor materials and devices
- Force Microscopy Techniques and Applications
- Supercapacitor Materials and Fabrication
- Metal and Thin Film Mechanics
- Advanced Battery Materials and Technologies
- ZnO doping and properties
- Mechanical and Optical Resonators
- 2D Materials and Applications
- Advanced Battery Technologies Research
- Advanced Sensor and Energy Harvesting Materials
- MXene and MAX Phase Materials
- Ga2O3 and related materials
- Electronic and Structural Properties of Oxides
- Nanotechnology research and applications
- Nanopore and Nanochannel Transport Studies
- Electrochemical sensors and biosensors
- Thermal properties of materials
- Advanced Materials Characterization Techniques
- Ion-surface interactions and analysis
- Additive Manufacturing and 3D Printing Technologies
- Advanced Photocatalysis Techniques
University of North Texas
2016-2025
Discovery Place
2020
Hanyang University
2010-2013
Florida International University
2004-2012
Harvard University
2012
Pohang University of Science and Technology
2006-2007
National Institute of Genetics
2007
Samsung (South Korea)
1999-2005
National Institute for Materials Science
2003
Kitakyushu Foundation for the Advancement of Industry, Science and Technology
1999-2003
A fully sealed field-emission display 4.5 in. in size has been fabricated using single-wall carbon nanotube (CNT)-organic binders. The displays were scalable at low temperature, below 415 °C, and CNTs vertically aligned paste squeeze surface rubbing techniques. turn-on fields of 1 V/μm field emission current 1.5 mA 3 (J=90 μA/cm2) observed. Brightness 1800 cd/m2 3.7 was observed on the entire area a panel from green phosphor-indium–tin–oxide glass. fluctuation found to be about 7% over cathode area.
Abstract Sensors are of great importance in different aspects research and industry. Future sensors will require high‐efficient low‐cost manufacturing, as well high‐performance functionality areas, such mechanical sensing, biomedical, optical applications. Recent advances 3D printing open a new paradigm for fabrication precision, customizable, seamless process. In this article, the state‐of‐the‐art methods manufacturing is reviewed performance printed sensing materials devices summarized....
Abstract Additively manufactured flexible and high‐performance piezoelectric devices are highly desirable for sensing energy harvesting of 3D conformal structures. Herein, the study reports a significantly enhanced piezoelectricity in polyvinylidene fluoride (PVDF) achieved through situ dipole alignment PVDF within PVDF‐2D molybdenum disulfide (2D MoS 2 ) composite by printing. The shear stress‐induced poling 2D harnessed during printing to boost without requiring post‐poling process....
Monoclinic gallium oxide nanowires are prepared here by arc discharge of GaN powder in the presence a small amount transition metal catalyst. The characterized X-ray diffraction, energy dispersive spectroscopy, and Raman evidence as to mechanism their formation (shown Figure) is obtained high-resolution transmission electron microscopy.
Vertically aligned carbon nanotubes were synthesized on Ni-deposited Si substrates using microwave plasma-enhanced chemical vapor deposition. The grain size of Ni thin films varied with the rf power density during magnetron sputtering process. We found that diameter, growth rate, and could be controlled systematically by films. With decreasing films, diameter decreased, whereas rate increased. High-resolution transmission electron microscope images clearly demonstrated to multiwalled.
A triode-type field emission display has been fabricated using carbon nanotube emitters. Purified single walled nanotubes were selectively deposited onto a cathode electrode in structure by an electrophoresis. Emission current was modulated with gate potentials of 100–300 V. high brightness 1000 cd/m2 uniform obtained at 900 V the anode and 200 gate. The fluctuation found to be less than 5% fully sealed display. Selective deposition electrophoresis shows feasibility for displays.
Graphene was grown directly on porous nickel films, followed by the growth of controlled lengths vertical carbon nanotube (CNT) forests that seamlessly emanate from graphene surface. The metal-graphene-CNT structure is used to fabricate field-emitter devices and double-layer capacitors. three-dimensional nanostructured hybrid materials, with better interfacial contacts volume utilization, can stimulate development several energy-efficient technologies.
We present a novel binder-free multiwall carbon nanotube (MWCNT) structure as an anode in Li ion batteries. The interface-controlled MWCNT structure, synthesized through two-step process of catalyst deposition and chemical vapor (CVD) directly grown on copper current collector, showed very high specific capacity, almost three times that graphite, excellent rate capability even at charging/discharging 3 C, no capacity degradation up to 50 cycles. Significantly enhanced properties this could...
Abstract The fabrication and functionalization of large‐area graphene its electrocatalytic properties for iodine reduction in a dye‐sensitized solar cell are reported. film, grown by thermal chemical vapor deposition, contains three to five layers monolayer graphene, as confirmed Raman spectroscopy high‐resolution transmission electron microscopy. Further, the film is treated with CF 4 reactive‐ion plasma fluorine ions successfully doped into X‐ray photoelectron UV‐photoemission...
We present the fabrication and electrical characterization of large graphene structure on polyethylene terephthalate (PET) flexible substrate. Graphene film was grown Cu foil by thermal chemical vapor deposition transferred to PET using hot press lamination. The graphene/PET shows high quality, transparent conductive with unique electrical-mechanical properties; ∼88.80% light transmittance ∼1.1742 kΩ/sq sheet resistance. demonstrate application as electrode for field emission displays. Our...
We demonstrate the direct deposition of two-dimensional (2D) MoS<sub>2</sub>thin film on Cu-foil and polymer substrates, exhibiting an excellent capacitance outstanding cyclic stability. The MoS<sub>2</sub>based supercapacitors will enable new opportunities in flexible electronics energy devices.
Two-dimensional (2D) materials have been a great interest as high-performance transparent and flexible electronics due to their high crystallinity in atomic thickness potential for variety applications optoelectronics. The present study explored the wafer scale production of MoS2 nanosheets with layer modulation from single multi-layer by using two-step method metal deposition CVD process. formation high-quality thickness-modulated film was confirmed Raman spectroscopy, AFM, HRTEM,...
We report the fabrication of graphene-WO3-Au hybrid membranes and evaluate their photocatalytic activity towards glucose oxidase mediated enzymatic oxidation. The dual-functionality gold nanoparticles in reinforcement visible light graphene-WO3 improving catalytic immobilized enzymes for unique photoelectrochemical sensing application is demonstrated. This work provides new insights into light-sensitive materials facilitates future.
Piezoelectricity in two-dimensional (2D) transition-metal dichalcogenides (TMDs) has attracted significant attention due to their unique crystal structure and the lack of inversion centers when bulk TMDs thin down monolayers. Although piezoelectric effect atomic-thickness been reported earlier, they are exfoliated 2D therefore not scalable. Here, we demonstrate a superior from large-scale sputtered, asymmetric MoS2 using meticulous defect engineering based on thermal-solvent annealing layer....
Neuromorphic computing based on two-dimensional transition-metal dichalcogenides (2D TMDs) has attracted significant attention recently due to their extraordinary properties generated by the atomic-thick layered structure. This study presents sulfur-defect-assisted MoS2 artificial synaptic devices fabricated a simple sputtering process, followed precise sulfur (S) vacancy-engineering process. While as-sputtered film does not show behavior, S vacancy-controlled exhibits excellent synapse with...