Proceedings of the 2nd IEEE Conference on Nanotechnology
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Infrared absorption and emission in conducting polymer/GaSb nanocomposites
- Trang 181-183
Nanocomposites consisting of GaSb nanoparticles in conducting polymer matrices (MEH-PPV) were fabricated and investigated. The nanocrystal-bearing sample, in contrast with the film polymer samples, exhibits an inductive effect attributable to minority-carrier injection and capture into the nanocrystals. Electroluminescence with a spectral maximum around 1600 nm wavelength was obtained for both sig......
#Electromagnetic wave absorption #Nanocomposites #Polymer films #Optical fiber communication #Nanoparticles #Nanocrystals #Electroluminescence #Quantization #Optical polymers #Optical fiber LAN
High yield non destructive purification of single wall carbon nanotubes monitored by EPR measurements
- Trang 439-442
A chemical purification method has been developed which leads to highly pure and little damaged single wall nanotubes (SWNT) with a 55 to 65% overall yield. It combines a short and soft acid reflux with a hydrogen peroxide reflux. Electron paramagnetic resonance (EPR) measurements have been used to assess the residual amount of both catalyst and amorphous carbon. By this method, the acid treatment......
#Purification #Carbon nanotubes #Monitoring #Paramagnetic resonance #Amorphous materials #Raw materials #Biomembranes #Chemical technology #Electrons #Laser ablation
A new two-layer quantum-dot large-neighborhood cellular nonlinear network (QLN-CNN) using quantum-dot cellular automata
- Trang 355-357
A novel structure of QLN-CNN is proposed. The new structure of the QLN-CNN contains two layers of QCA array and introduces concepts of the A cloning templates, the B cloning templates, and the thresholds. The gene-decoding concept of CNNs is also used in this structure. Thus it operates more like real CNNs. In this paper, three CNN operations are proven to be achieved by this new structure through......
#Quantum dots #Cellular networks #Neurons #Quantum cellular automata #Cellular neural networks #Electrostatics #Stationary state #Cloning #MATLAB #Logic
Design and analysis of a high speed operational amplifier made by 60 nm gate-length MOSFETs
- Trang 209-212
In this paper, a high speed operational amplifier (op amp) with 60 nm gate length MOSFET (nano-MOSFET) is presented. Cascode input stage is implemented to improve frequency response. After verifying the availability of cascode form in designing high speed op amp via SPICE model, we give simulation results to prove the speed of cascode op amp has no advantage compared with simple two-stage op amp i......
#Operational amplifiers #MOSFETs #Capacitance #Circuit simulation #Availability #SPICE #Analog circuits #Threshold voltage #Semiconductor device modeling #Doping
An high precision interferometric system for nanodeplacement measurements
- Trang 41-43
This paper presents the principle of an air wavelength standard for high accuracy length metrology. According to the definition of the metre, nanometric accuracy by interferometric measurement techniques can be reached only for measurements made under vacuum or by taking into account the fluctuations of the refractive index of air. We have developed a new type of laser source whose wavelength is i......
#Wavelength measurement #Refractive index #Fluctuations #Optical interferometry #Laser stability #Length measurement #Optical refraction #Frequency #Laser transitions #Tunable circuits and devices
An RF circuit model for carbon nanotubes
- Trang 393-396
We develop an rf circuit model for single walled carbon nanotubes for both dc and capacitively contacted geometries. By modeling the nanotube as a nano-transmission line with distributed kinetic and magnetic inductance as well as distributed quantum and electrostatic capacitance, we calculate the complex, frequency dependent impedance for a variety of measurement geometries. Exciting voltage waves......
#Radio frequency #Circuits #Carbon nanotubes #Solid modeling #Geometry #Kinetic theory #Electrostatics #Quantum capacitance #Frequency dependence #Impedance
Electron transport in nanoscale bipolar transistors
- Trang 103-106
As base widths are reduced to tens of nanometers in modern bipolar transistors, current transport becomes quasi-ballistic. Classical transport models do not capture transport at this scale. We report the development of a new one-dimensional bipolar transistor simulator - nanoBJT, to study electron transport in nanoscale transistors. The simulator incorporates a variety of carrier transport models,......
#Bipolar transistors #Poisson equations #Electron emission #MOSFETs #Physics #Boltzmann equation #Distribution functions #Design automation #Art #Gallium arsenide
Thermal longevity of nano-multilayer magnetic media
- Trang 71-74
A common concern about the use of particles a few nanometers in size is their stability. This paper addresses a technique for estimating the longevity on the basis of measurements that can be made in a reasonable time. Using the recently developed Preisach-Arrhenius model, the decay rate can be quantified using the chemical potential. Measurements in Co/Pt multilayer media have shown that at room ......
#Magnetization #Chemicals #Life estimation #Switches #Time measurement #Magnetic field measurement #Magnetic multilayers #Temperature #Atmospheric modeling #Magnetic materials
Coherent LO phonons generated by high-velocity electrons in two-dimensional channels and their impact on carrier transport
- Trang 1-4
We show that Cerenkov generation of confined LO phonons by drifting electrons can be achieved in biased quantum wells (QWs). Both linear and nonlinear regimes of phonon generation are analyzed. The kinetic parameters of the drifting electrons are estimated by using momentum and energy balance equations for electron scattering by the confined optical phonons. Our findings suggest that high efficien......
#Phonons #Optical scattering #Electron optics #Nonlinear optics #Optical saturation #Carrier confinement #Kinetic theory #Nonlinear equations #Particle scattering #Scattering parameters
Surface-mounted thin-film actuators in pointing systems applications
- Trang 465-470
In this paper, high-fidelity modeling, precision positioning, vibration and disturbance attenuations, as well as tracking control problems for flexible beams with thin-film PZT actuators are studied. The mathematical models of the beam are described by partial differential equations. Nonlinear actuator dynamics are integrated to perform design, and guarantee accurate performance analysis with outc......
#Transistors #Actuators #Mathematical model #Pi control #Vibration control #Attenuation #Partial differential equations #Performance analysis #Hysteresis #Degradation