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In this paper we demonstrate a fully integrated 300 V low current charge pump design which has been manufactured using Teledyne DALSA's triple well 800 nm high voltage IC process. This charge pump is powered by a 5 V supply, drawing less than 2% of the USB 2.0 maximum current, thus enabling future low-cost compact point-of-care diagnostic devices that would be connected to and powered off a laptop...
We propose a new class of semiconductor transistor devices based on graphene/SiC and graphene/Si Schottky junctions that have the potential to be transformative. By using the graphene as collector/emitter in a bipolar transistor (BJT) and not as a channel material, there is relaxation of the tolerances in graphene thickness and quality, simplifying growth, device design and fabrication. This also...
Electromechanical resonators in the micro (MEMS) and nano (NEMS) regimes have emerged as promising tools for use in diverse applications such as ultrasensitive physical, chemical, and biological sensors, with detection limits as low as a single molecule. The advent of state-of-the-art micro-fabrication techniques has enabled a high throughput platform for commercialization. However, the sensitivity...
Nickel-zinc ferrite nanoparticles with compositions of NixZn1−xFe2O4, where x = 0.1 − 0.9, were synthesized using a water-based precipitation technique. These nanoparticles were then calcined at high temperature to improve crystallinity and were characterized to determine their magnetic and dielectric properties. After selecting the synthesized composition with the most favorable magnetodielectric...
The pH sensing response of the alternating current (AC) on the source/drain was investigated on lithographically defined Si NGFETs which were modified with APDMES. The sensors were measured under different frequency and the sensitivity was improved (∼ 2 to 8 times) in a frequency range from 100Hz to 100KHz, with the maximum of improvement around the cut-off frequency.
We report the enhancement of electrostatic transfer characteristics of fabricated graphene field-effect transistor (FET) by hexamethyldisilazane (HMDS) surface treatment. Charge carrier mobility increases by over 50% on average for both electron and hole. Impurity concentration also reduces by over 50% on average and charge neutrality point usually moves towards zero gate voltage. Electrostatic transfer...
We present a microfabricated platform that allows simultaneous application of controlled stretch/compression forces and fluid flow shear stresses during endothelial cell (EC) live-cell monitoring. Our device employs a highly flexible magnetic composite polymer (M-CP) for actuation of a flexible microchannel system. We combine our M-CP with micropatterned non-magnetic polydimethylsiloxane (PDMS), resulting...
The last several decades have seen nanoscience concepts move from research level students and educators to undergraduate level content. More recently, high school educators have used nanotechnology to ignite student interest in science. Nanotechnology is now discussed with younger children in both formal and informal settings. In addition to fueling an interest in science and science careers, nanoscience...
By the use of novel techniques like Silicon-on-insulator (SOI) wafer and electron beam lithography (EBL), the development of new types of NEMS-sensors, like a nanoscale Thermal-Time-of-Flight (TToF) sensor, are possible. While scaling the dimensions to a nanoscale level, new side effects will become non neglectable. Within the research and development of a nanoscale TToF sensor such a side effect...
In this paper, we propose and demonstrate a new method for local cell stiffness measurement using multiple probes system. Thin glass pipettes were employed to measure the stiffness of cells on a general culture dish. The thin micropipettes were prepared and their spring constant was measured using the Atomic Force Microscopy (AFM) cantilever before stiffness measurement. The deformation of the pipette...
We develop highly flexible and compressible 3D interconnected porous PDMS structures by using sugar cubes as templates. The porous structures can be compressed to more than 80% without any side-wall buckling comparable with bulk polymers. Force sensitive resistors were fabricated by filtration of the CNT solution inside the porous structure of PDMS. We found that sufficient acid treatment can increase...
First principles-based calculations of the electronic and phonon properties of monolayer MoS2 are performed to assess the thermoelectric performance of this 2D material. By comparing monolayer MoS2 to bulk Bi2Te3, a good and well-characterized thermoelectric, it is found that the intrinsic properties of MoS2 are similar to Bi2Te3 in terms of thermoelectric figure-of-merit. While the advantage of Bi...
We propose a new concept “Lab in a Droplet (LiD)” as a micro to nano scale self-assembly technique. The liquid bridge force is used for assembly of microstructures automatically. Micro/nano objects are ejected from an inkjet nozzle and they are automatically assembled inside a droplet by the liquid bridge force. In this paper, we conducted preliminary experiment to check the possibility of LiD. The...
Microtubule gliding on a kinesin-coated surface may be applied as a nanoactuator to manipulate nanoscale materials in a microfluidic environment. However, controlling the velocity and direction of microtubule gliding has been a major challenge for bioengineering. To develop a novel method of molecular manipulation, we propose a technique to control the velocity of gliding microtubules by light irradiance,...
We report on the morphological, electrical and optical characteristics of Carbon nanotube (CNT) films on different transparent substrates, obtained using spray deposition. The effect of different substrate materials on the characteristics of spayed CNT films with varying thickness is investigated. While film morphology is shown to depend on the underlying surface characteristics, no significant changes...
For polymer solar cells, the efficiency loss is caused by considerable carrier recombination in active layer based on low carrier diffusion length or low carrier collection. Here, to increase the carrier collection, ZnO nanorods are inserted between thin ZnO seed layer and active layer. Consequently, the carrier transport is improved by using ZnO nanorods, and then the carrier collection rate and...
The synthesis of single-crystal silicon (Si) nanowires by a metal-catalyst-free vapor-liquid-solid (VLS) process was studied. Silicon nanowires have been successfully synthesized by simple thermal treatment without any metal catalyst. For cases without metal catalysts, Si nanowires are grown by VLS processes assisted by sulfur. It is thought that single-crystal Si nanowires are grown by a VLS process...
In this work Barium Titanate- Polyvinylpyrrolidone (BaTiO3/PVP) composite nanofibers are synthesized via electrospinning with sol-gel precursor. BaTiO3 nanofibers are obtained after calcinning the composite at 960 °C for 20 h. The morphology and crystal structure of the electrospun composite nanofibers are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and FT-IR analyses...
Recently, resistive switches have been constructed from nanogap electrodes. We have already reported a simple method for the fabrication of nanogaps with well-controlled tunnel resistance, which is called “activation”. Since the activation is considered to be the method of transferring atoms across the nanogap, it is expected that a resistive switching effect is caused in the nanogaps controlled by...
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