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This paper presents the advantages of carbon nanotubes and graphene for spintronics. The advantage of CNT and graphene can be illustrated by experimental data on the basic structure composed a lateral channel connected to magnetic electrodes. In the simplest situation, i.e lateral channels between ferromagnetic sources and drains, the spin signal is simply the change ΔR between the parallel and antiparallel...
The following topics are dealt with: functionalization and modification of nanotubes and nanowires; electron emission phenomena; vacuum electronics; graphene related materials; field and photoelectron emission; materials, processing and equipment; nanodevices; nanomagnetism and spintronics.
The paper presents the growth and optimization of carbon nanotube (CNT) and CNT/zinc oxide nanostructures to produce novel electron sources. The emitters studied in this project are based on regular array of vertically aligned 5 μm height and 50 nm diameter CNTs with a pitch of 10 μm. Such a cathode design allows to minimize electric field shielding effects and thus help in optimizing the emitted...
Summary form only given. Developing wireless nanodevices and nanosystems is of critical importance for sensing, medical science, environmental/infrastructure monitoring, defense technology and even personal electronics. It is highly desirable for wireless devices to be self-powered without using battery. This is a new initiative in today's energy research for mico/nano-systems in searching for sustainable...
In the formation of SWCNT controlling of its diameter and chirality will be shown to be affected by controlling the size of the metal catalyst. The usual size of carbon nanohorn (CNH) particles is about 80 nm but its smaller size of less than 30nm is needed for a biomedical application purpose because of their permeation through biological cell membranes. The small CNHs have been successfully realized...
Current work on using nanostructured carbon surfaces in supercapacitors and batteries to enable enhanced performance is discussed. The emphasis is on solid electrolyte based batteries and supercapacitors which can be flexible and change form factor. This is a new concept for energy storage systems driven by the requirements of next generation mobile communication devices which will be designed to...
The author discusses possible renewable energy solutions to exploit solar energy, control of materials complexity to examine energy storage, and use of designer nanoplatforms to solve efficiency issues in using conventional architectures for lighting. Key areas at present being developed in the quest for solution processable solar cells are introduced, and how nanotechnology can be used to optimise...
A growing number of one-dimensional nanomaterials including nanotubes, nanorods and nanowires have been synthesized and found to give attractive field electron emission performance. Field emission from a two-dimensional (2D) regime is emerging as new hot topic, due to graphene can offer ones such opportunity, and its open surface and sharp edge may be beneficial for field emission. Two-dimensional...
Summary form only given. By using the in situ thermal analysis-mass spectroscopic technique, the CVD growth process of CNTs with benzene precursor has been clearly illuminated and the six-membered-ring-based growth mechanism through surface diffusion is deduced. Moreover, by applying this mechanism to the synthesis with pyridine precursor, nitrogen-doped CNTs (NCNTs) with predominant pyridinic N over...
Pure carbon nanotubes have been known to exhibit ambipolarity. This is very different from the conventional semiconductors that are controlled by an intentional doping with extrinsic materials. The ambipolarity has been a serious drawback in adopting carbon nanotubes for CMOS technology. Carbon nanotubes show p-type behavior in ambient conditions. The difficulty arises from the absence of stable n-type...
In this paper, the use of carbon nanostructures as GPa high-pressure deformation and reaction cells on the nanoscale is presented. Controlled irradiation of multiwalled carbon nanotubes can cause large pressure (up to 40GPa) buildup within the nanotube cores that can plastically deform, extrude, and break solid materials that are encapsulated inside the core. Compressive forces from graphitic shells...
Summary form only given. In this talk, I will summarize the recent research on carbon nanotubes (CNTs) and graphene-related materials done in my group. It includes the dip-pen nanolithography-based controlled fabrication of CNT arrays on solid substrates, "needle-scratching" method based fabrication of large-area catalyst patterns used for growth of ultralong (0.5 mm) and high density single-walled...
Summary form only given. Carbon nanotubes (CNTs), one of the most popular nanoscale materials, have been investigated intensively over the last decade for many of their potential applications. These studies were largely based on theoretical and experimental results from limited numbers of prototype CNT-based devices including field effect transistors (FETs), electron field emitters, interconnects,...
This paper presents direct growth approach for production of graphene and carbon nanotubes in an on-chip manner towards integrated devices. Vertically aligned arrays of carbon nanotubes and edge-oriented graphene are synthesized by microwave plasma-enhanced chemical vapor deposition using methane and hydrogen as precursors. Cyclic voltammetry (CV) and electrochemical energy impedance measurements...
Summary form only given. Transmission electron microscope (TEM) undergoes the revolutionary improvement recent years. The introduction of Cs-corrector on TEM column has greatly increased TEM imaging resolution. A resolution of sub Angstrom is realistic. At the same time, the atomic scale spatial resolution for analysis becomes also possible. These, combined with much improved analytical energy resolution,...
With the rapid development of broadcasting, communication and aviation industry, the study of vacuum electron devices has become the key issue of the researchers around the world. Being the heart of electron tubes and magnetrons, the cathode plays an important role in these devices. Two kinds of cathodes, rare earth oxide-Mo cermet (RE2O3-Mo in brief) secondary emission materials and Scandia doped...
In order to study the characteristics of barium tungsten cathodes coated with Os film during activation, a photoelectron spectroscopy using synchrotron radiation (SPRES) at Beijing Synchrotron Radiation Laboratory is utilized. SPRES is a far more sensitive tool to determine surface composition than either XPS or AES. The cathode, manufactured by ourselves, has a stated impregnant composition of 6BaO/CaO/2Al...
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