A5075825851- Graphene research and applications
- 2D Materials and Applications
- Carbon Nanotubes in Composites
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Mechanical and Optical Resonators
- Nanowire Synthesis and Applications
- MXene and MAX Phase Materials
- Advancements in Battery Materials
- Conducting polymers and applications
- Photonic and Optical Devices
- Supercapacitor Materials and Fabrication
- Plasmonic and Surface Plasmon Research
- Graphene and Nanomaterials Applications
- Advanced Sensor and Energy Harvesting Materials
- Quantum and electron transport phenomena
- Diamond and Carbon-based Materials Research
- Thermal properties of materials
- Nanopore and Nanochannel Transport Studies
- Advanced Memory and Neural Computing
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Gold and Silver Nanoparticles Synthesis and Applications
- Force Microscopy Techniques and Applications
Massachusetts Institute of Technology
2016-2025
China Huadian Corporation (China)
2023-2025
Shanghai Jiao Tong University
2023-2025
Hohai University
2025
IIT@MIT
2006-2024
Beijing Aerospace Flight Control Center
2022-2024
Hebei University of Chinese Medicine
2022-2024
Korea Aerospace University
2024
Qufu Normal University
2021-2024
Foshan University
2022-2024
Chemical sensors based on individual single-walled carbon nanotubes (SWNTs) are demonstrated. Upon exposure to gaseous molecules such as NO(2) or NH(3), the electrical resistance of a semiconducting SWNT is found dramatically increase decrease. This serves basis for nanotube molecular sensors. The exhibit fast response and substantially higher sensitivity than that existing solid-state at room temperature. Sensor reversibility achieved by slow recovery under ambient conditions heating high...
In this work we present a low cost and scalable technique, via ambient pressure chemical vapor deposition (CVD) on polycrystalline Ni films, to fabricate large area ( approximately cm2) films of single- few-layer graphene transfer the nonspecific substrates. These consist regions 1 12 layers. Single- or bilayer can be up 20 mum in lateral size. The are continuous over entire patterned lithographically by prepatterning underlying film. transparency, conductivity, ambipolar characteristics...
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...
Monolayer molybdenum disulfide (MoS2) is a two-dimensional direct band gap semiconductor with unique mechanical, electronic, optical, and chemical properties that can be utilized for novel nanoelectronics optoelectronics devices. The performance of these devices strongly depends on the quality defect morphology MoS2 layers. Here we provide systematic study intrinsic structural defects in vapor phase grown monolayer MoS2, including point defects, dislocations, grain boundaries, edges, via...
Two-dimensional (2D) materials, such as molybdenum disulfide (MoS2), have been shown to exhibit excellent electrical and optical properties. The semiconducting nature of MoS2 allows it overcome the shortcomings zero-bandgap graphene, while still sharing many graphene's advantages for electronic optoelectronic applications. Discrete components, field-effect transistors, sensors photodetectors made from few-layer show promising performance potential substitute Si in conventional electronics...
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...
Excellent sensors for molecular hydrogen,to be used, e.g., leakage control in H2-based energy sources, are fabricated by functionalization of single-walled carbon nanotubes (SWNTs) with a non-continuous coating palladium. These sensors, large electrical conductivity modulation the presence small H2 concentrations air, show fast response and high sensitivity even at room temperature. The Figure presents an AFM image Pd-coated SWNT.
Graphene is a monolayer of carbon atoms packed into two-dimensional (2D) honeycomb crystal structure, which special material with many excellent properties. In the present study, we will discuss possibility that graphene can be used as substrate for enhancing Raman signals adsorbed molecules. Here, phthalocyanine (Pc), rhodamine 6G (R6G), protoporphyin IX (PPP), and violet (CV), are popular molecules widely probe, deposited equally on SiO2/Si using vacuum evaporation or solution soaking. By...
We present a method for synthesizing MoS2/Graphene hybrid heterostructures with growth template of graphene-covered Cu foil. Compared to other recent reports,(1, 2) much lower temperature 400 °C is required this procedure. The chemical vapor deposition MoS2 on the graphene surface gives rise single crystalline hexagonal flakes typical lateral size ranging from several hundred nanometers micrometers. precursor (ammonium thiomolybdate) together solvent was transported by carrier gas at room...
We report the synthesis of high-quality single-walled carbon nanotubes (SWNT) by chemical vapor deposition (CVD) methane at 1000°C on supported Fe2O3 catalysts. The type catalyst support is found to control formation individual or bundled SWNTs. Catalysts crystalline alumina nanoparticles produce abundant SWNTs and small bundles. amorphous silica particles only SWNT Studies ends lead an understanding their growth mechanism. Also, we present results CVD NiO, CoO NiO/CoO
The synthesis of bulk amounts high quality single-walled carbon nanotubes (SWNTs) is accomplished by optimizing the chemical compositions and textural properties catalyst material used in vapor deposition (CVD) methane. A series catalysts are derived systematically varying catalytic metal compounds support materials. optimized consist Fe/Mo bimetallic species supported on a novel silica−alumina multicomponent material. SWNT yielding exhibits surface-area large mesopore volume at elevated...
We engineered functional cardiac patches by seeding neonatal rat cardiomyocytes onto carbon nanotube (CNT)-incorporated photo-cross-linkable gelatin methacrylate (GelMA) hydrogels. The resulting constructs showed excellent mechanical integrity and advanced electrophysiological functions. Specifically, myocardial tissues cultured on 50 μm thick CNT-GelMA 3 times higher spontaneous synchronous beating rates 85% lower excitation threshold, compared to those pristine GelMA Our results indicate...
In this article, the role of kinetics, in particular, pressure reaction chamber chemical vapor deposition (CVD) synthesis graphene using low carbon solid solubility catalysts (Cu), on both large area thickness uniformity and defect density are presented. Although thermodynamics system remains same, based whether process is performed at atmospheric (AP), (LP) (0.1−1 Torr) or under ultrahigh vacuum (UHV) conditions, kinetics growth phenomenon different, leading to a variation resulting over...
Dynamically reconfigurable metasurfaces open up unprecedented opportunities in applications such as high capacity communications, dynamic beam shaping, hyperspectral imaging, and adaptive optics. The realization of performance metasurface-based devices remains a great challenge due to very limited tuning ranges modulation depths. Here we show that widely tunable metasurface composed optical antennas on graphene can be incorporated into subwavelength-thick cavity create an electrically...
We report selective ionic transport through controlled, high-density, subnanometer diameter pores in macroscopic single-layer graphene membranes. Isolated, reactive defects were first introduced into the lattice ion bombardment and subsequently enlarged by oxidative etching permeable with diameters of 0.40 ± 0.24 nm densities exceeding 10(12) cm(-2), while retaining structural integrity graphene. Transport measurements across ion-irradiated membranes subjected to situ revealed that created...
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....
The thinnest semiconductor, molybdenum disulfide (MoS2) monolayer, exhibits promising prospects in the applications of optoelectronics and valleytronics. A uniform highly crystalline MoS2 monolayer a large area is desirable for both fundamental studies substantial applications. Here, utilizing various aromatic molecules as seeding promoters, large-area, crystalline, was achieved with chemical vapor deposition (CVD) at relatively low growth temperature (650 °C). dependence results on seed...
Modulation doping of a semiconducting single-walled carbon nanotube along its length leads to an intramolecular wire electronic device. The is doped n -type for half and p the other half. Electrostatic gating can tune system into - junctions, causing it exhibit rectifying characteristics or negative differential conductance. also be tuned -type, exhibiting single-electron charging conductance at low temperatures. low-temperature behavior manifested by quantum dot formed chemical inhomogeneity tube.
Recently, monolayers of layered transition metal dichalcogenides (LTMD), such as MX2 (M = Mo, W and X S, Se), have been reported to exhibit significant spin-valley coupling optoelectronic performances because the unique structural symmetry band structures. Monolayers in this class materials offered a burgeoning field fundamental physics, energy harvesting, electronics, optoelectronics. However, most studies date are hindered by great challenges on synthesis transfer high-quality LTMD...