Hua Zhang

Bio: Hua Zhang is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Medicine & Graphene. The author has an hindex of 163, co-authored 1503 publications receiving 116769 citations. Previous affiliations of Hua Zhang include Shenzhen University & Zhengzhou University.

Epitaxial Growth of Hetero-Nanostructures Based on Ultrathin Two-Dimensional Nanosheets

Abstract: Ultrathin two-dimensional (2D) nanosheets, such as graphene and MoS2, which are demonstrated to be fundamentally and technologically important in many applications, have emerged as a unique family of nanomaterials in chemistry and material science over the past decade. The single-crystalline nature and ultrathin thickness of these 2D nanosheets make them ideal templates for the epitaxial deposition of nanostructures, which offer many possibilities to engineer microsized 2D p-n hetero-junctions at atomic/nanometer scale. This Perspective aims to provide information on the epitaxial growth of hetero-nanostructures based on ultrathin 2D nanosheets. Various methods for the epitaxial growth of nanostructures based on ultrathin 2D nanosheets or in situ growth of lateral or vertical epitaxial 2D semiconductor hetero-nanostructures are introduced. The advantages of these 2D epitaxial hetero-nanostructures for some applications, such as electronics, optoelectronics, and electrocatalysis, are also presented. On the basis of the current status of 2D epitaxial hetero-nanostructures, the future prospects of this promising area are discussed.

Tubular TiC fibre nanostructures as supercapacitor electrode materials with stable cycling life and wide-temperature performance

Abstract: Highly active electrode materials with judicious design of nanostructure are important for the construction of high-performance electrochemical energy storage devices. In this work, we have fabricated a tubular TiC fibre cloth as an interesting type of stable supercapacitive material. Hollow microfibres of TiC are synthesized by carbothermal treatment of commercial T-shirt cotton fibres. To demonstrate the rationale of nanostructuring in energy storage, the hollow fibres are further covered by interwoven TiC nanotube branches, forming 3D tubular all-TiC hierarchical fibres with high electrical conductivity, high surface area, and high porosity. For energy storage functions, organic symmetric supercapacitors based on the hollow fibre–nanotube (HFNT) TiC cloth electrodes are assembled and thoroughly characterized. The TiC-based electrodes show very stable capacitance in long charge–discharge cycles and at different temperatures. In particular, the integrated TiC HFNT cloth electrodes show a reasonably high capacitance (185 F g−1 at 2 A g−1), better cycling stability at high-rates (e.g., 97% retention at room temperature after 150 000 cycles, and 67% at −15 °C after 50 000 cycles) than other control electrodes (e.g., pure carbon fibre cloths). It is envisaged that this 3D tubular TiC fibre cloth is also useful for solar cells and electrocatalysis.

Surface-Charge-Mediated Formation of H-TiO2@Ni(OH)2 Heterostructures for High-Performance Supercapacitors

Abstract: An electrochemically favorable Ni(OH)2 with porously hierarchical structure and ultrathin nanosheets in a core-shell structure H-TiO2 @Ni(OH)2 is achieved through modulating the surface chemical activity of TiO2 by hydrogenation, which creates a defect-rich surface of TiO2 , thereby facilitating the subsequent nucleation and growth of Ni(OH)2 . These configuration-tailored H-TiO2 @Ni(OH)2 core-shell nanowires exhibit a superior electrochemical performance and good flexibility.

Fabrication of graphene nanomesh by using an anodic aluminum oxide membrane as a template.

Abstract: Graphene, a one-atom-thick two-dimensional carbon sheet, has been extensively studied owing to its broad applications in nanoelectronics, [ 1 , 2 ] nanocomposites, [ 3 , 4 ] chemical sensors and biosensors, [ 5–10 ] solar cells, [ 11–13 ] and electrical and optical devices. [ 14–16 ] However, the application of graphene in fi eldeffect transistors (FETs) is limited because of its semi-metallic behavior with zero bandgap. [ 17 , 18 ] Cutting graphene sheets into nanoribbons led to bandgap opening, with current ON/OFF ratio large enough for transistor operation. [ 19–23 ] Unfortunately, FET devices based on the individual nanoribbons exhibited low driving current and conductance. [ 22 ]

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Fast parallel algorithms for short-range molecular dynamics

Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

Abstract: Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.