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In recent years, there has been an increasing interest in the monitoring and controlling of pH. It has become an important aspect of many industrial wastewater and water quality treatment processes. At the same time, the demand for smaller electronic devices used for various industrial, commercial, and research applications has greatly increased. In this paper, we propose a fabrication method of Ion-Sensitive...
We present a successful inkjet printing capability for solar electrodes with line widths below 100 μm. A Theologically tailored conductive silver nano-ink was created to meet the rheological requirement of industrial printheads (XAAR 1001). The jetting optimization for the printhead was done using a desktop R&D inkjet printer from PiXDRO (OTB Solar). Printer-integrated software allowed the optimization...
We have investigated the copolymer polyvinylidene fluoride, (PVDF-trifluoroethylene) for energy harvesting. Polyvinylidene fluoride (PVDF) nanofibers were electrospun on indium tin oxide (ITO) coated plastic. The electrical response of nanofibers at different frequencies was investigated. The experimental results demonstrate that the duty cycle of electrical response pulses is increased as the frequency...
We present an approach for complete inkjet printing of solar cell front contacts for the implementation of "selective emitter approach", which can help in solar cell efficiency improvement. The fabrication of optimized emitters that can allow the low recombination below the silver front contact is an important process in solar cell fabrication. This selective emitter approach presents a...
This paper reports a microcontact printing (μCP) using flexible flat polydimethylsiloxane (PDMS) stamps with metal embedment. In conventional μCP process, self-assembled monolayer (SAM) ink can be transferred by conformal contact between a structural PDMS stamp and a substrate. In our research we utilized that hexadecanethiol (HDT), one of SAM ink molecules for μCP, can be soaked to the PDMS, but...
We study the mobility and high field velocity in graphene placed upon various substrates, such as BN, SiC, or SiO2. The transport is subject to the intrinsic phonons in graphene, as well as flexural modes, but it is the remote polar modes from the substrate and impurities sited between the substrate layer and the graphene that dominate the mobility and velocity.
Single gate and double gate GNRFETs with 5–20% doping of potassium (K) in source (S), drain (D) and channel region having width (W)=2 and 5 nm have been synthesized. On-to-off current ratio (Ion/Ioff) and sub-threshold swing (S) for single gate GNRFET having W=2nm with 10% of K doping have been found to be ∼10 and ∼20mV/dec, respectively whereas these value for double gate have been found ∼10 and...
An attractive+ to graphene for a range of applications is graphene oxide (GO). GO is an insulator because of the hydroxyl, carboxyl, carbonyl and epoxide functional groups presenting on the basal surface or edge and becomes a semiconductor or semimetal as it is reduced back toward graphene. Here we demonstrate that graphene oxide can be reversibly reduced and oxidized in nanometer-scale by applying...
The authors report fabrication of vertical Schottky diodes using sub-100nm diameter n-type doped Silicon nanopillars. The nanopillars were fabricated using a top-down approach employing the Bosch process. Square-shaped islands of Silicon dioxide patterned using electron beam lithography and deposited by thermal evaporation acted as hard masks for vertical inductively coupled plasma (ICP) etching....
One of the key components of modern device structures is the metal-semiconductor (MS) contact with low symmetric contact resistance. We report on a MS contact structure utilizing graphene insertion. In this strategy, graphene reduces or even eliminates in ideal conditions, the Fermi-level pinning at a MS junction. Since the metal, Ni, deposited on graphene reduced the work function of graphene, the...
Self assembled Copper-Silicide nanowires were fabricated on a 600 °C annealed Si(111) substrate by electron beam evaporation technique. In situ scanning electron microscopy images of self assembled Copper-Silicide nanowires and nanoislands were obtained. In situ four point probe electrical resistivity measurements were performed on Copper-Silicide nanowires using Pt-Ir probes. The cross section geometry...
This work presents a new technology suitable for localized infrared (IR) phototherapy. Specified regions of a VO2 thin film were programmed to different transmissivity values in the near IR. Such programming was done through photothermal actuation of the thin film, achieved by controlling the scanning of a red laser over its surface. The thermally-induced phase transition of the VO2 thin film comes...
DNA sequencing using nanopore-based sensors attracts considerable interests because of the possibility of ultimate sensitivity of single-molecule resolution. Due to the fast DNA translocation speed on the order of microsecond, the sensor requires a wide bandwidth exceeding a megahertz. Such a high frequency signal transmits through the electrolyte and the sensor measures ionic current changes. The...
We present a novel method for separating circulating tumor cells (CTCs) with high recovery and purity at the same time using a micro-slit filter chip and a fully automated fluidic system. Considering white blood cells (WBCs) as big as CTCs are also captured with CTCs during filtration, we amplified the size of CTCs specifically using microbeads (3 μm) coated with anti-Epithelial Cell Adhesion Molecule...
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