A5087242105- Graphene research and applications
- 2D Materials and Applications
- Carbon Nanotubes in Composites
- Advanced Memory and Neural Computing
- Advancements in Battery Materials
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- MXene and MAX Phase Materials
- Diamond and Carbon-based Materials Research
- Graphene and Nanomaterials Applications
- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Supercapacitor Materials and Fabrication
- Nanopore and Nanochannel Transport Studies
- Electrocatalysts for Energy Conversion
- Molecular Junctions and Nanostructures
- Advanced Photocatalysis Techniques
- Advanced biosensing and bioanalysis techniques
- Nanotechnology research and applications
- Semiconductor materials and interfaces
- Thermal properties of materials
- Chalcogenide Semiconductor Thin Films
- Quantum and electron transport phenomena
- Gas Sensing Nanomaterials and Sensors
National Taiwan University
2009-2025
Tainan University of Technology
2015-2019
Institute of Atomic and Molecular Sciences, Academia Sinica
2009-2019
National Cheng Kung University
2012-2017
Massachusetts Institute of Technology
2007-2014
University of Pittsburgh
2010
University of Massachusetts Lowell
2009
IIT@MIT
2009
Oak Ridge National Laboratory
2009
Institute for Scientific and Technological Research
2009
Raman spectroscopy is here shown to provide a powerful tool differentiate between two different sp(2) carbon nanostructures (carbon nanotubes and graphene) which have many properties in common others that differ. Emphasis given the richness of both as prototype examples nanostructured materials. A glimpse toward future developments this field presented.
Health and environmental impacts of graphene-based materials need to be thoroughly evaluated before their potential applications. Graphene has strong cytotoxicity toward bacteria. To better understand its antimicrobial mechanism, we compared the antibacterial activity four types (graphite (Gt), graphite oxide (GtO), graphene (GO), reduced (rGO)) a bacterial model—Escherichia coli. Under similar concentration incubation conditions, GO dispersion shows highest activity, sequentially followed...
Hexagonal boron nitride (h-BN) is very attractive for many applications, particularly, as protective coating, dielectric layer/substrate, transparent membrane, or deep ultraviolet emitter. In this work, we carried out a detailed investigation of h-BN synthesis on Cu substrate using chemical vapor deposition (CVD) with two heating zones under low pressure (LP). Previous atmospheric (AP) CVD syntheses were only able to obtain few layer without good control the number layers. contrast, LPCVD...
In this contribution we demonstrate a method of synthesizing hexagonal boron nitride (h-BN) thin film by ambient pressure chemical vapor deposition on polycrystalline Ni films. Depending the growth conditions, thickness obtained h-BN is between ∼5 and 50 nm. The grows continuously entire surface region with uniform can be up to 20 μm in lateral size which only limited single crystal grains. structure was confirmed both electron X-ray diffraction. photoelectron spectroscopy shows B/N atomic...
This paper reviews progress that has been made in the use of Raman spectroscopy to study graphene and carbon nanotubes. These are two nanostructured forms sp2 materials major current interest. have attracted particular attention because their simplicity, small physical size exciting new science they introduced. review focuses on each these systems individually comparatively as prototype examples materials. In particular, this discusses power a probe characterization tool for materials, with...
Graphene nanoribbons can exhibit either quasi-metallic or semiconducting behavior, depending on the atomic structure of their edges. Thus, it is important to control morphology and crystallinity these edges for practical purposes. We demonstrated an efficient edge-reconstruction process, at scale, graphitic by Joule heating. During heating electron beam irradiation, carbon atoms are vaporized, subsequently sharp step-edge arrays stabilized, mostly with zigzag- armchair-edge configurations....
In this work, we demonstrate that graphene films synthesized by chemical vapor deposition (CVD) method can be used as thin transparent electrodes with tunable work function. By immersing the CVD-grown into AuCl3 solution, Au particles were formed on surface of spontaneous reduction metal ions. The potential adjusted (by up to ∼0.5 eV) controlling immersion time. Photovoltaic devices based n-type silicon interfacing fabricated benefit an electrode maximum power conversion efficiency (PCE)...
Here we report on the fabrication and characterization of a novel type strain gauge based percolative networks 2D materials. The high sensitivity carrier transport to induced morphology changes was exploited in sensors that can be produced from wide variety Highly reliable sensitive graphene-based thin film gauges were solution processed graphene flakes by spray deposition. Control could exerted through deposition-induced morphology. This exceptional property explained modeling flake–flake...
Graphene is expected to enable superior corrosion protection due its impermeability and chemical inertness. Previous reports, however, demonstrate limited inhibition even enhancement of graphene on metal surfaces. To the reliable complete passivation, origin low efficiency was investigated. Combining electrochemical morphological characterization techniques, nanometer-sized structural defects in vapor deposition grown were found be cause for passivation effect. Extremely fast mass transport...
Progress in the use of Raman spectroscopy to characterize graphene samples for number layers and doping level they contain is briefly reviewed. Comparisons prior studies on graphites carbon nanotubes are used inspiration define future promising directions research few layer graphenes.
Flexible and transparent pressure sensor arrays can find applications in many places such as touch panels, artificial skin, or human motion detection. However, conventional strain gauges are rigid opaque not suitable for applications. Graphene‐based percolative overcome these challenges but currently still the infancy of their development. In this work, performance graphene‐based is investigated guidelines to improve durability sensitivity graphene films sensing elements developed. It found...
2D materials' junctions have demonstrated capabilities as metal-free alternatives for the hydrogen evolution reaction (HER). To date, HER has been limited to heterojunctions of different compositions or band structures. Here, potential local strain modulation based on wrinkled heterostructures is demonstrated, which helps realize photoelectrocatalytically active junctions. By forming regions high and low tensile in WS2 monolayers, modification their structure internal electric field due...
Airborne nanoparticles released during the synthesis of single-walled and multi-walled carbon nanotubes were measured characterized. This study reported field measurements development nanotube production. Monitoring data taken sampling methods to characterize aerosol release developed along with modification production in a time period from 2006 2009. Particle number concentrations for diameters 5 nm 20 μm using fast mobility particle sizer aerodynamic sizer; particles furnace found be less...
Raman spectroscopy and in situ spectroelectrochemistry have been used to study the influence of defects on spectra semiconducting individual single-walled carbon nanotubes (SWCNTs). The were created intentionally part an originally defect-free nanotube, which allowed us analyze how this particular nanotube. formation was followed by that showed D band intensity coming from defective no original same It is shown presence also reduces symmetry-allowed features. Furthermore, changes resonance...
Multistate logic is recognized as a promising approach to increase the device density of microelectronics, but current approaches are offset by limited performance and large circuit complexity. We here demonstrate route toward increased integration that enabled mechanically tunable concept. Bi-anti-ambipolar transistors (bi-AATs) exhibit two distinct peaks in their transconductance can be realized single 2D-material heterojunction-based solid-state device. Dynamic deformation reveals...
The clean production of hydrogen from water using sunlight has emerged as a sustainable alternative toward large-scale energy generation and storage. However, designing photoactive semiconductors that are suitable for both light harvesting splitting is pivotal challenge. Atomically thin transition metal dichalcogenides (TMD) considered promising photocatalysts because their wide range available electronic properties compositional variability. trade-offs between carrier transport efficiency,...
A new and general approach to achieving efficient electrically driven light emission from a Si-based nano p-n junction array is introduced. wafer-scale of p-type silicon nanotips were formed by single-step self-masked dry etching process, which compatible with current semiconductor technologies. On top the nanotip array, layer n-type ZnO film was grown pulsed laser deposition. Both narrow line width 10 nm in cathodoluminescence spectra appearance multiphonon Raman up fourth order indicate...
The synthesis of graphene with controllable electronic and mechanical characteristics is significant importance for its application in various fields ranging from drug delivery to energy storage. Electrochemical exfoliation graphite has yielded widely varying behavior could be a suitable approach. Currently, however the limited understanding process obstructs targeted modification properties. We here investigate electrochemical impact parameters on produced graphene. Using situ optical...
In this work, we present efficient, robust, and transparent electromagnetic interference (EMI) shielding by a hybrid material comprised of nickel (Ni) mesh conformal graphene coating. We demonstrate that 20 nm-thick graphene/Ni can provide EMI effectiveness (SE) exceeding 12.1 dB (∼93.6% power attenuation) in the decimeter band while retaining high visible transmittance ∼83%. Its maximum achieved SE value was 26.6 (∼99.5% at 0.75 GHz. Furthermore, thicker Ni exhibited higher SE. Compared to...
The selective production of long, horizontally aligned carbon nanotubes (>1 mm) or short, randomly oriented (<50 μm) was achieved in a chemical vapor deposition process by influencing the catalyst pretreatment and reaction conditions. A detailed investigation undertaken to elucidate mechanism yielding two different morphologies. It found that duration catalytic growth nanotube plays vital role; is, actual period long is significantly higher (up 15 min more) compared short (10 s less)....