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Nanoscale tweezers are integrated to deep reactive ion etching (DRIE)-processed microelectrodes by localized chemical vapor deposition using focused ion beam (FIB-CVD). The MEMS electrodes for electrostatic actuation of nano tweezers are fabricated on a heavily doped SOI wafer, which works as the interconnecting platform to control nanoscale device from macro-world. Unlike the carbon nano tube (CNT)-based...
Carbon nanofibers (CNFs) are synthesized at 450-650degC by a catalytic CVD method using nickel powders reduced from nickel carbonate as catalyst without other supporting materials, and acetylene as carbon source. It is found that the nickel powders present a considerable catalytic efficiency in the growth of the CNFs at the temperature between 500-550degC. TEM observation shows that a large portion...
The WC-Co composite nano-coatings bonded strongly with steel substrate has been made by vacuum fusion sintering (VFS). Diffusion plays a crucial role in VFS processes, of which the atoms diffusion nearby interface is a vital variable which influences the interfacial bond strength. The atoms diffusion during the vacuum fusion sintering (VFS) process was firstly studied by molecular dynamics and by...
Hydrogenated and oxygenated nano-crystalline boron-doped diamond (BDD) films were prepared by hydrogen-plasma treatment and boiling in the strong acids, respectively. Surface characteristics of the two diamond films have been investigated by scanning electron microscopy (SEM) and Raman spectroscopy. In order to clarify detailed electronic structures of surface-treated nano-crystalline diamond films,...
Aligned nanofibers, filament bundle composed of large number of nanofibers have potential applications such as biomaterials, composite materials etc. A series of electrospinning experiment has been conducted to investigate the electrospinning process, through which, some parameters such as polymer solution concentration, bias voltage, distance between spinneret and collector, solution flow rate etc...
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...
This paper reports the fabrication and experiment of a micro time of flight (TOF) mass spectrometer adopting a new ion generation method using a carbon nanostructure. The device is composed of an ion source and an ion separator. The ion source generates electrons by the field emission method. Carbon nanostructure has good field emission property. The emitted electrons collide with sample molecules...
In order to study antibacterial properties of nanometer TiO2 thin films, nanometer Fe3+-TiO2 films have been prepared on glass by RF magnetron co-sputtering method. The films were characterized by SEM, XRD, and XPS. The influence of Fe element and calcination temperature on the films structure was investigated. The principle of substitution impurity to improve the activity was discussed. The bactericidal...
In order to understand the formation mechanism of nano- materials during the arc discharge in liquid, serial experiments were conducted on synthesis of nano-materials by arc discharge both in water and in liquid nitrogen. Previous research showed that the stability of arc discharge affected the nano-products significantly. In this paper, the cross magnetic field (CMF) was introduced to disturb the...
Surface plasmon waves (SP) are electromagnetic waves that propagate at the interface between a metal such as gold or silver and a dielectric. In a manner similar to the propagation of photons through a Fabry-Perot filter, the propagation of SP can be blocked by periodic nanostructures on the surface. This phenomenon can be described with a band gap in the SP dispersion relation. By taking advantage...
The relation of direct proportion between absorbance and nanometer grain content is educed by analysing the extinction law which the monochromatic light passes turbid solution of nanometer grain. The feasibility mensurating nanometer grain content for complex material by spectrophotometric method is verified according to the composite deposit of Ni-P/alpha-Al2O3 (30nm). The results show that the standard...
GaN nanorods with vertebra-like morphology were synthesized by nitriding Ga2O3/ZnO films at 1000degC for 20min. Ga2O3 thin films and ZnO middle layers were pre-deposited in turn on Si(III) substrates by r.f. magnetron sputtering system. In the flowing ammonia ambient, ZnO was reducted to Zn and Zn sublimated at 1000degC. Ga2O3 was reducted to Ga 2O and Ga2O reacted with NH3 to synthesize GaN nanorods...
Field emission properties of carbon nanotubes (CNTs) filled with single crystalline Cu nanoneedles at their tips have been investigated in situ with an STM-TEM holder. The CNTs are synthesized using an alkali doped Cu catalyst by a thermal chemical vapor deposition method. Experiments show that CNTs filled with Cu have a much lower turn-on voltage (generally lower than 75V) than those without Cu (>...
Two opposite shape transformation processes are observed during the synthesis of alumina nanofibers. In liquid phase alumina hydrate nanospheres are assembled into nanofibers by hydrolysis of aluminum alkoxide, while in vacuum state the nanofibers are disassembled into nanospheres by electron beam irradiation. A number of parameters which dominate the processes are investigated, including the aging...
Nano-sized ZnO crystals with catalytic, electrical, optoelectronic, and photochemical properties have been considered as an important candidate in both fundamental research and practical studies. However, controllable synthesis of ZnO in morphology and size with a simple method under mild conditions still represents a challenge. We proved that ZnO nanostructures, including particles and nanorods,...
Described in this paper is a novel method to fabricate the isolated nano-beams in the normal (111) Si wafers. The cantilever and the double clamped beams with nano thickness are anchored through the metal wires, which are isolated to the substrate electrically. The thickness of the beams is determined by dry etching. The beams are released by KOH etching. As the bottom of the beams is (111) plane,...
We report on electrophoretic alignment of ZnO nanobelt bunches and their electrical and optical properties. The nanobelts were trapped onto a pair of electrodes by using alternating electrical current at frequency between 5 ~ 50 MHz and peak-to-peak amplitude from 2 to 20 V. Their electrical transport properties associated with the photoelectricity were studied at room temperature in the air ambient...
In this paper, we investigated the self-cleaning effects of biomimetic dry adhesives, which are made of e-beam photoresist and carbon nanotubes (CNT). Although the photoresist and the CNT are both intrinsically hydrophilic, superhydrophobic behavior was obtained when they were patterned or synthesized into nano-fibrils. The intrinsic hydrophilicity indicates that these materials possess sufficient...
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