A5101581129- Graphene research and applications
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Ga2O3 and related materials
- Quantum Dots Synthesis And Properties
- Carbon Nanotubes in Composites
- Magnetic properties of thin films
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- 2D Materials and Applications
- Chalcogenide Semiconductor Thin Films
- GaN-based semiconductor devices and materials
- Copper-based nanomaterials and applications
- Conducting polymers and applications
- Nanopore and Nanochannel Transport Studies
- Silicon Nanostructures and Photoluminescence
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Semiconductor materials and devices
- Advanced Sensor and Energy Harvesting Materials
- Multiferroics and related materials
- Thermal properties of materials
- Molecular Junctions and Nanostructures
Southern University of Science and Technology
2016-2025
Beijing Academy of Quantum Information Sciences
2022-2025
Yunnan Normal University
2015-2025
Quantum (Australia)
2024-2025
Dalian University of Technology
2017-2025
Dongyang People's Hospital
2025
Liaocheng People's Hospital
2025
Wenzhou Medical University
2025
Dalian University
2025
Peking University
2014-2024
By using ab initio calculations, we predict that a vertical electric field is able to open band gap in semimetallic single-layer buckled silicene and germanene. The sizes of the both germanene increase linearly with strength. Ab quantum transport simulation dual-gated effect transistor confirms opens gap, significant switching by an applied gate voltage also observed. Therefore, biased can work effectively at room temperature as transistors.
ZnO nanowires were mass produced using a physical vapor deposition approach. The nanowire monocrystallites have an average diameter around 60 nm and length up to few micrometers. unidirectional growth of the was controlled by conventional vapor-liquid-solid mechanism. Intensive UV light emission peaked 3.27 eV observed at room temperature, which assigned from free exciton under low excitation intensity. temperature ascribed decrease in structure defects as compared bulk materials,...
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTArtificial Lotus Leaf by NanocastingManhui Sun, Chunxiong Luo, Luping Xu, Hang Ji, Qi Ouyang, Dapeng Yu, and Yong ChenView Author Information Center for Microfluidics Nanotechnology, Peking University, 100871 Beijing, PR China, School of Physics, Ecole Normale Suéprieure, 24 rue Lhomond, 75231 Paris, France Cite this: Langmuir 2005, 21, 19, 8978–8981Publication Date (Web):August 16, 2005Publication History Received4 February 2005Revised22 July...
A large quantity of nanosized ZnO tubular structures was prepared using a very simple thermal evaporation mixed Zn–ZnO powders under wet oxidation condition. The nanotubes have hollow core with crystalline wall 8–20 nm in thickness. Optical properties were studied at room temperature. Raman peaks arising from the analyzed, which correspond well to that bulk sample. photoluminescence measurements revealed an intensive UV peak 377 corresponding free exciton emission, and broad about 500...
Advancing of the lead halide perovskite solar cells towards photovoltaic market demands large-scale devices high-power conversion efficiency, high reproducibility and stability via low-cost fabrication technology, in particular resistance to humid environment for long-time operation. Here we achieve uniform film based on a novel polymer-scaffold architecture mild-temperature process. These exhibit efficiency up ∼ 16% with small variation. The unencapsulated retain output 300 h highly (70%...
Silver nanowires with different diameters were synthesized by a hydrothermal chemical method. The elastic properties of the outer ranging from 20 to $140\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ measured using contact atomic force microscopy. apparent Young modulus is found decrease increase diameter. When diameter silver larger than $100\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, approaches constant value. size dependence attributed surface effect, which includes effects stress, oxidation layer,...
We report large-scale synthesis of silica nanowires (SiONWs) using an excimer laser ablation method. Silica was produced in the form amorphous at a diameter ∼15 nm and length up to hundreds micrometers. The SiONWs emit stable high brightness blue light energies 2.65 3.0 eV. intensity emission is two orders magnitude higher than that porous silicon. may have potential applications high-resolution optical heads scanning near-field microscope or nanointerconnections future integrated devices.
Well-aligned arrays of ZnO nanoneedles were fabricated using a simple vapor phase growth. The diameters the nanoneedle tips are as small several nanometers, which is highly in favor field emission. Field-emission measurements cathode showed emission current density high 2.4 mA/cm2 under 7 V/μm, and very low turn-on V/μm. Such attributed to aspect ratio nanoneedles. density, stability, make one promising candidates for field-emission displays.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBismuth Nanotubes: A Rational Low-Temperature Synthetic RouteYadong Li, Junwei Wang, Zhaoxiang Deng, Yiying Wu, Xiaoming Sun, Dapeng Yu, and Peidong YangView Author Information Department of Chemistry Tsinghua-Foxconn Nanotechnology Laboratory the Key Atomic & Molecular Nanosciences (Ministry Education, China), Tsinghua University Beijing, 100084, P.R. China Chemistry, California Berkeley, 94720 Physics, Peking Cite this: J. Am. Chem. Soc....
We report, for the first time, synthesis of high-quality p-type ZnO NWs using a simple chemical vapor deposition method, where phosphorus pentoxide has been used as dopant source. Single-crystal doped have their growth axis along 001 direction and form perfect vertical arrays on a-sapphire. P-type doping was confirmed by photoluminescence measurements at various temperatures studying electrical transport in single field-effect transistors. Comparisons low-temperature PL unintentionally...
Ionic transport in organometal halide perovskites is of vital importance because it dominates anomalous phenomena perovskite solar cells, from hysteresis to switchable photovoltaic effects. However, excited state ionic under illumination has remained elusive, although essential for understanding the unusual light-induced effects (light-induced self-poling, photo-induced segregation and slow photoconductivity response) optoelectronic applications. Here, we quantitatively demonstrate...
Dirac electronic materials beyond graphene and topological insulators have recently attracted considerable attention. Cd3As2 is a semimetal with linear dispersion along all three momentum directions can be viewed as three-dimensional analogue of graphene. By breaking either time-reversal symmetry or spatial inversion symmetry, the believed to transform into Weyl an exotic chiral anomaly effect, however experimental evidence still missing in Cd3As2. Here we show large negative...
Formamidinium-lead-iodide (FAPbI
The power conversion efficiency (PCE) of CH3NH3PbX3 (X = I, Br, Cl) perovskite solar cells has been developed rapidly from 6.5 to 18% within 3 years. However, the anomalous hysteresis found in I-V measurements can cause an inaccurate estimation efficiency. We attribute phenomena ferroelectric effect and build a model based on diode explain it. CH3NH3PbI3-xClx is strongly suggested by characterization methods E-P (electrical field-polarization) loop. curves greatly depend scan range as well...
Opening a sizable band gap without degrading its high carrier mobility is as vital for silicene graphene to application high-performance field effect transistor (FET). Our density functional theory calculations predict that opened in by single-side adsorption of alkali atom result sublattice or bond symmetry breaking. The size controllable changing the coverage, with an impressive maximum up 0.50 eV. ab initio quantum transport simulation bottom-gated FET based on sodium-covered reveals gap,...
Due to light-induced effects in CH3NH3-based perovskites, such as ion migration, defects formation, and halide segregation, the degradation of perovskite solar cells under maximum power point is generally implicated. Here we demonstrated that effect light-enhanced migration CH3NH3PbI3 can be eliminated by inorganic Cs substitution, leading an ultrastable cell. Quantitatively, barrier for 0.62 eV dark conditions, larger than CsPbI2Br (0.45 eV); however, it reduces 0.07 illumination, smaller...
The first electronic measurement of DNA translocation through ultrathin BN nanopores is demonstrated. show much higher detection sensitivity compared with SiN nanopores. has a spatial resolution as graphene. provide substantial opportunities in realizing high-spatial-sensitivity nanopore electrical devices for various applications.
Abstract Recent years have witnessed a rapidly growing interest in exploring the use of spin waves for information transmission and computation toward establishing spin-wave-based technology that is not only significantly more energy efficient than CMOS technology, but may also cause major departure from von-Neumann architecture by enabling memory-in-logic logic-in-memory architectures. A bottleneck advancing this excitation with short wavelengths, which must because wavelength dictates...
The strain dependence of conductance monolayer graphene has been studied experimentally here. results illustrate the notable transitions: slight increase, dramatic decrease, and sudden dropping by gradually increasing uniaxial strain. behaves reversibly tuning elastic tensile up to 4.5%, while it fails recover after plastic deformation at 5%. change in due is surprisingly high, which indicates potential applications electromechanical devices.
Organic-inorganic hybrid perovskites are promising candidates for the next-generation solar cells. Many efforts have been made to study their structures in search a better mechanistic understanding guide materials optimization. Here, we investigate structure instability of single-crystalline CH3NH3PbI3 (MAPbI3) film by using transmission electron microscopy. We find that MAPbI3 is very sensitive beam illumination and rapidly decomposes into hexagonal PbI2. propose decomposition pathway,...
Abstract Metal corrosion is a long‐lasting problem in history and ultrahigh anticorrosion one ultimate pursuit the metal‐related industry. Graphene, principle, can be revolutionary material for due to its excellent impermeability any molecule or ion (except protons). However, real applications, it found that metallic graphene forms an electrochemical circuit with protected metals accelerate once corrosive fluids leaks into interface. Therefore, whether used as under intense debate now. Here,...
We report the large-scale synthesis of silicon nanowires (SiNWs) using a simple but effective approach. High purity SiNWs uniform diameters around 15 nm were obtained by sublimating hot-pressed powder target at 1200 °C in flowing carrier gas environment. The emit stable blue light which seems unrelated to quantum confinement, related an amorphous overcoating layer oxide. Our approach can be used, principle, as general method for other one-dimensional semiconducting, or conducting nanowires.