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Metal-insulator-semiconductors structures (MIS) with a layer of silicon nanocrystals embedded within two SiO2 layers are fabricated by using plasma enhanced chemical vapor deposition. By using current-voltage (I-V) measurements with different sweep rates, we study the mechanism of electrons and holes charging/discharging characteristic of the MIS structures. Distinct current peaks duo to electrons...
In this paper, vertically AlN nanocone arrays have been successfully fabricated at 550degC. They are all single crystals with a wurtzite structure and grow along [0001] orientation. These AlN nanocones are found to have good field emission behaviors, suggesting they could be excellent cathode nanomaterials in future.
Preparation and characterization of large-area vacuum microelectronic arrays using nanoemitters is a challenge in the field of vacuum micro/nanoelectronics, and their potential application in functional devices such as flat panel display and imaging remains an attractive topic. The issues concerned include: i) design of device microstructure and integration of nanoemitters with desirable microstructures,...
The assembly of a single carbon nanocoil on the tip of an atomic force microscope probe has been demonstrated by utilizing dielectrophoresis in an isopropyl alcohol solution. The nanocoil adheres to the probe tip where the maximum electrical field exists. Its orientation due to the relative position between the probe tip and the dielectrophoresis electrode has been investigated. The capillary effect...
ZnO acicular nanostructure was designed and grown from aqueous solution on the conductive substrate. The diameter of ZnO was 50 nm and length was about 5 mum. due to the large aspect ratio, the as-prepare ZnO sample was applied in filed emission with turn-on electric intensity of 3.2 V/mum and enhancement factor beta of 2830.
We report the observation of various quantum behaviors of nanocrystalline silicon/crystalline silicon heterostructure diodes. Tunneling has been proved to be the dominant transport mechanism for the device-grade diode operating below 80 K. For the sample which is composed by highly ordered nanocrystalline silicon, interesting physical phenomena have been revealed, which include high electron mobility,...
In this work, we investigated the preparation and characterization of nanodiamond thin films on silicon substrate and then studied the electron field emission. We concluded that nanodiamond surface sp2 or sp3 hybridization play an important role in field emission, and some intrinsic relationship between top surface chemical state and emission feature will be established in our future research.
In this work, the low temperature solution method was used to synthesize the ZnO nanorods. Its density can by tuned by simple adjusting the thickness of the seed layer. ZnO seed layers with stepwise increasing thickness were first deposited on the Si substrate by direct current sputtering. Field emission properties of the ZnO nanorods with different density were systematically measured and compared...
Large scale crystalline Fe3O4 nanopyramid arrays are fabricated by CH4 and N2 plasma sputtering of hematite [0001] wafer. The nanopyramid arrays are characterized using SEM, TEM and EELS and the possible growth mechanism is discussed
W18O49 nanotip arrays were prepared by a two-step high-temperature, catalyst-free physical evaporation deposition process in high-purity argon gas. The prepared products were characterized by scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. Field emission measurements were carried out with a transparent...
In this paper, single tungsten oxide (WOx) nanotip has been welded on tungsten microtip by pulsed laser. Also, field emission characteristic and low resistance electrical contact were obtained using scanning electron microscopy (SEM)
In this paper, the effects of Ta & C compositions and process temperature on magnetic and structural properties of FeTaC films, the composition and temperature dependence of magnetic and structural properties of nanocrystalline FeTaxCy (x =7 - 9, y = 10 -18) soft magnetic films annealed at a temperature range of 400 -550degC in vacuum is presented.
FePt:C composite films with large magnetocrystalline anisotropy are in-situ fabricated in this study by sputter deposition. The microstructure and magnetic properties of the films are investigated using X-ray diffraction, transmission electron microscopy and polar magneto-optical Kerr analysis. Well-defined grain boundaries and relatively uniform grain with mean diameter of 5.6 nm are obtained by...
We report on the development of new elastomers and processes that utilize polymers such as PDMS, FSR (force sensitive resistor) polymer, MWCNT, and polyurethane to realize bioinspired sensors such as artificial haircells. In nature, haircell sensors are used by fish to sense flow, by spiders to sense vibration, and by some vertebrates for hearing and acoustics. An artificial haircell sensor is designed...
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