A5100454174- Advancements in Battery Materials
- Carbon Nanotubes in Composites
- Supercapacitor Materials and Fabrication
- Graphene research and applications
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- Advanced battery technologies research
- Perovskite Materials and Applications
- Crystallization and Solubility Studies
- Catalytic Processes in Materials Science
- X-ray Diffraction in Crystallography
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- ZnO doping and properties
- Laser-Plasma Interactions and Diagnostics
- Ga2O3 and related materials
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Sensor and Energy Harvesting Materials
- Luminescence Properties of Advanced Materials
- Organic Electronics and Photovoltaics
- Gas Sensing Nanomaterials and Sensors
- Mechanical and Optical Resonators
- GaN-based semiconductor devices and materials
Center for High Pressure Science and Technology Advanced Research
2020-2025
PLA Army Engineering University
2019-2025
China Academy of Engineering Physics
2016-2025
Peking University
2016-2025
Peking University People's Hospital
2019-2025
Qingdao University
2016-2025
Tianjin University
2014-2025
Hangzhou Dianzi University
2016-2025
Anhui University
1992-2025
Fudan University
2004-2025
Single-wall fullerene nanotubes were converted from nearly endless, highly tangled ropes into short, open-ended pipes that behave as individual macromolecules. Raw nanotube material was purified in large batches, and the cut 100- to 300-nanometer lengths. The resulting pieces formed a stable colloidal suspension water with help of surfactants. These suspensions permit variety manipulations, such sorting by length, derivatization, tethering gold surfaces.
The research field on perovskite solar cells (PSCs) is seeing frequent record breaking in the power conversion efficiency (PCE). However, organic-inorganic hybrid halide perovskites and organic additives common hole-transport materials (HTMs) exhibit poor stability against moisture heat. Here we report successful fabrication of all-inorganic PSCs without any labile or expensive components. entire process can be operated ambient environment humidity control (e.g., a glovebox). Even...
For efficient use of metal oxides, such as MnO2 and RuO2, in pseudocapacitors other electrochemical applications, the poor conductivity oxide is a major problem. To tackle problem, we have designed ternary nanocomposite film composed (MnO2), carbon nanotube (CNT), conducting polymer (CP). Each component MnO2/CNT/CP provides unique critical function to achieve optimized properties. The performance evaluated by cyclic voltammetry, constant-current charge/discharge cycling techniques. Specific...
Hydrogen adsorption on crystalline ropes of carbon single-walled nanotubes (SWNT) was found to exceed 8 wt. %, which is the highest capacity any material. first adsorbed outer surfaces ropes. At pressures higher than about 40 bar at 80 K, however, a phase transition occurs where there separation individual SWNTs, and hydrogen physisorbed their exposed surfaces. The pressure this provides tube-tube cohesive energy for much material 5 meV/C atom. This small affected strongly by quality order in
The synergism of large surface area, multiscale porous structure, and good conductivity endows hierarchical carbon nanocages with high-level supercapacitive performances. Further nitrogen doping greatly improves the hydrophilicity, which boosts performances to an ultrahigh specific capacitance up 313 F g(-1) at 1 A g(-1).
Monitoring changes in vegetation growth has been the subject of considerable research during past several decades, because important role regulating terrestrial carbon cycle and climate system. In this study, we combined datasets satellite-derived Normalized Difference Vegetation Index (NDVI) climatic factors to analyze spatio-temporal patterns their linkage with temperature precipitation temperate boreal regions Eurasia (> 23.5°N) from 1982 2006. At continental scale, although a...
We have induced large elastic strains in ropes of single-wall carbon nanotubes, using an atomic force microscope lateral mode. Freely suspended were observed to deform as strings with tension proportional elongation. Ropes elastically deformed over >10 cycles without showing signs plastic deformation. The maximum strain observed, 5.8±0.9%, gives a lower bound 45±7 GPa for the tensile strength (specifically, yield stress) nanotube ropes.
Flexible and lightweight energy storage systems have received tremendous interest recently due to their potential applications in wearable electronics, roll-up displays, other devices. To manufacture such systems, flexible electrodes with desired mechanical electrochemical properties are critical. Herein we present a novel method fabricate conductive, highly flexible, robust film supercapacitor based on graphene/MnO(2)/CNTs nanocomposites. The synergistic effects from graphene, CNTs, MnO(2)...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTInfrared Spectral Evidence for the Etching of Carbon Nanotubes: Ozone Oxidation at 298 KDouglas B. Mawhinney, Viktor Naumenko, Anya Kuznetsova, John T. Yates, J. Liu, and R. E. SmalleyView Author Information Surface Science Center, Department Chemistry University Pittsburgh Pittsburgh, Pennsylvania 15260 Chemistry, Rice Houston, Texas 77005 Cite this: Am. Chem. Soc. 2000, 122, 10, 2383–2384Publication Date (Web):February 29, 2000Publication...
The rapidly increasing use of silver nanoparticles (Ag NPs) in consumer products and medical applications has raised ecological human health concerns. A key question for addressing these concerns is whether Ag NP toxicity mechanistically unique to nanoparticulate silver, or if it a result the release ions. Furthermore, since NPs are produced large variety monomer sizes coatings, their physicochemical behavior depends on media composition, important understand how variables modulate toxicity....
Ethanol sensing has important applications, including breath alcohol checkers. A highly selective and stable ethanol sensor—see Figure—based on single-crystalline divanadium pentoxide nanobelts is described, representing a new strategy for the design of novel practicable gas sensors. Potential problems caused by changes relative humidity or presence other gases are ruled out.
Silver nanoparticles (AgNPs) are increasingly used as antimicrobial additives in consumer products and may have adverse impacts on organisms when they inadvertently enter ecosystems. This study investigated the uptake toxicity of AgNPs to common grass, Lolium multiflorum. We found that root shoot Ag content increased with increasing AgNP exposures. inhibited seedling growth. While exposed 40 mg L−1 GA-coated AgNPs, seedlings failed develop hairs, had highly vacuolated collapsed cortical...
Semiconducting single-walled carbon nanotubes are studied in the diffusive transport regime. The peak mobility is found to scale with square of nanotube diameter and inversely temperature. maximum conductance, corrected for contacts, linear inverse These results good agreement theoretical predictions acoustic phonon scattering combination unusual band structure nanotubes. measurements set upper bound performance transistors operating
Single-walled nanotubes (SWNTs) produced by plasma laser vaporization (PLV) and containing oxidized surface functional groups have been studied for the first time with NEXAFS. Comparisons are made to SWNTs catalytic synthesis over Fe particles in high-pressure CO, called HiPco material. The results indicate that acid purification cutting of single-walled either HNO3/H2SO4 or H2O2/H2SO4 mixtures produces (O/C = 5.5−6.7%), which exhibit both π*(CO) σ*(CO) C K-edge NEXAFS resonances. This...
The emergence of perovskite solar cells (PSCs) has generated enormous interest in the photovoltaic research community. Recently, cesium metal halides (CsMX3, M = Pb or Sn; X I, Br, Cl mixed halides) as a class inorganic perovskites showed great promise for PSCs and other optoelectronic devices. However, CsMX3-based usually exhibit lower power conversion efficiencies (PCEs) than organic–inorganic hybrid PSCs, due to unfavorable band gaps. Herein, novel mixed-Pb/Sn mixed-halide perovskite,...
A series of two-dimensional (2D) hybrid organic-inorganic perovskite (HOIP) crystals, based on acene alkylamine cations (i.e., phenylmethylammonium (PMA), 2-phenylethylammonium (PEA), 1-(2-naphthyl)methanammonium (NMA), and 2-(2-naphthyl)ethanammonium (NEA)) lead(II) halide PbX42-, X = Cl, Br, I) frameworks, their corresponding thin films were fabricated examined for structure-property relationship. Several new or redetermined crystal structures are reported, including those (NEA)2PbI4,...
Lithium-sulfur batteries (Li-S) have attracted soaring attention due to the particularly high energy density for advanced storage system. However, practical application of Li-S still faces multiple challenges, including shuttle effect intermediate polysulfides, low conductivity sulfur and large volume variation cathode. To overcome these issues, here we reported a self-templated approach prepare interconnected carbon nanotubes inserted/wired hollow Co3S4 nanoboxes (CNTs/Co3S4-NBs) as an...
Highly purified single-wall carbon nanotubes (SWNTs) were fluorinated to form "fluorotubes", which then solvated as individual tubes in various alcohol solvents via ultrasonication. The solvation of fluorotubes was verified by dispersing the on a mica substrate and examining them with atomic force microscopy (AFM). Elemental analysis reveals that light sonication does not remove significant amounts fluorine. While these solutions are metastable, they will persist long enough (over week)...