【摘 要】
:
Large scale tungsten nanowires and tungsten nanodots are prepared in a controllable way.The preparation is based on mechanisms of chemical vapor transportation
【机 构】
:
Institute of Nuclear Energy and New Energy System Materials, School of Materials Sciences and Engine
论文部分内容阅读
Large scale tungsten nanowires and tungsten nanodots are prepared in a controllable way.The preparation is based on mechanisms of chemical vapor transportation and phase transformation during the reduction of ammonium metatungstate (AMT) in H2.The AMT is first encapsulated into the hollow core of nanostructured carbon with hollow macroporous core/mesoporous shell (NC-HMC/MS) and forms nanorods,which are the precursors of both tungsten nanowires and tungsten nanodots.Just by controlling H2 flow rate and heating rate in the reduction process,the AMT nanorods could tu into nanowires (under low rate condition) or nanodots (under high rate condition).Besides,via heat treatment at 1200 ℃,the as-obtained nano-sized tungsten could convert into W2C nanorods or WC nanodots respectively.Furthermore,the diameter of the as-obtained tungsten or tungsten carbide is confined within 50 nm by the NC-HMC/MS,and no agglomeration appears in the obtained nanomaterials.
其他文献
本实验以一个由“羊角椒×方灯笼甜椒”的杂交而成的牛角椒组合作为供体,通过花药培养技术构建一个由103个DH系组成的DH群体,以此DH群体为试验材料,对该DH群体进行单果重等5个果
Molecular dynamics simulations are conducted to study self-interstitial migration in zirconium.By defining crystal lattice points where more than one atom is pr
Inteal effects of the dynamic behaviors and nonlinear characteristics of a coupled fractional order hydropower generation system (HGS) are analyzed. A mathemati
本试验通过对三个番茄品种(红博士、俄毕德、合作918)的种子进行人工老化后,获得了中、中下、低三组不同活力程度的老化种子,再用聚乙二醇(PEG)、赤霉素、磷酸二氢钾三种渗透控制药
《新闻记者》杂志是我每期必看的杂志之一,多年来,它以其编排新颖、信息量大、给人以知识、启迪而受到众多读者的欢迎。作为一名热爱《新闻记者》杂志的读者,当然希望它能在
The effects of different coating layers on lithium metal anode formed by reacting with different controlled atmospheres (argon,CO2-O2(2∶1),N2,and CO2-O2-N2(2∶
The magnetic properties and magnetization reversible processes of L10 FePt (3 nm)/Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) heterostructure were investigated by using
The influences of total ionizing dose (TID) on the single event effect (SEE) sensitivity of 34-nm and 25-nm NAND flash memories are investigated in this paper.
We present a first-principles study of the structural,dielectric,and lattice dynamical properties for chalcopyrite semiconductor ZnSnP2.The structural propertie
In order to validate the similarity principle of microwave breakdown, a two-dimensional (2D) fluid model of low-pressure microwave argon plasma is established a