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Synthesis of large-area graphene has been realized on the top of copper substrates by chemical vapor deposition (CVD) at ambient pressure with the flow of a mixture of hydrogen and methane gases. The graphene layers were transferred to the oxidized silicon wafers employing a undercutting method. The intense G (1570 cm-1) and 2D (2700 cm-1) bands observed from Raman spectroscopy reveals the presence...
The following topics are dealt with: nanotube and graphene-based nanowires; field effect transistors; nanomanipulation; modeling of nanostructures and devices; nanohelics and electromagnetic devices; nanofabrication; nanomaterials synthesis and characterisation; nanoscale thermoelectric materials and devices; optical devices; security and safety; chemical and biosensors; energy and environment; modeling...
The transport properties of zigzag graphene nanoribbons (ZGNRs) with different patterns of vacancies are investigated by using density functional theory and nonequilibrium Green's function (NEGF) formalism. It is found that the transport properties are different with a different lattice type vacancy (A-type or B-type vacancy). The conductance of ZGNRs is more sensitive to an interior vacancy than...
Stochastic resonance (SR) in carbon nanotube field-effect transistors (CNT-FETs) was investigated to enhance their weak-signal response. When weak pulse trains were applied to the gate of a CNT-FET operating in a subthreshold regime, the correlation coefficient between the input and output voltages increased upon addition of noise with optimized intensity. SR was observed both in air and in solutions...
Researchers have been looking for novel materials to improve the performance of photonic devices. Graphene has great potential to optoelectronic applications because of its excellent optical properties. Here, we demonstrate using the graphene-based photodetectors for infrared detection under a zero-bias operation. We have demonstrated to use an electric-field-assisted method to manipulate graphene...
Graphene is a two-dimensional monolayer comprised of carbon atoms. By its unique intrinsic properties, graphene has many advantages for gas sensing. In this paper, we find results of the gas sensing performance using uniform single crystal structure graphene by mechanical exfoliation method measured under room temperature, atmospheric pressure. Also, we discuss the effects of various thermal treatments...
Electromigration-based deposition (EMBD) is proposed for the fabrication of three-dimensional (3D) metallic nanostructures. The process is based on nanofluidic mass delivery at the attogram scale from metal-filled carbon nanotubes (m@CNTs) using nanorobotic manipulation inside a transmission electron microscope. By attaching a conductive probe to the sidewall of the CNT, it has been shown that mass...
In this paper, we report the C-V characteristics measured from nanowire capacitor (NWCAP), which has been fabricated by connecting in parallel a large number of identically processed nanowire FETs. By using the C-V data from nanowire devices, we examined the gate voltage response of undoped floating channel. Furthermore, the bias independent overlap capacitance and bias dependent fringing capacitance...
Built-in electrostatic fields in zincblende quantum dots originate mainly from-(1) the fundamental crystal atomicity and the interfaces between two dissimilar materials, (2) the atomistic strain relaxation, and (3) the piezoelectric polarization. In this paper, using the atomistic NEMO 3-D simulator, we study the origin and nature of various internal fields in InAs/GaAs quantum dots having three different...
We present the reliabilities in compressively strained SiGe channel pMOSFETs. A Si capping layer in SiGe channel pMOSFETs improved the negative bias temperature instability (NBTI) without device performance degradation. Also, the Si capped device exhibits the better NBTI reliability than the Si channel device. Because a Si capped structure forms the double barrier layer in the interface, it is the...
In this work, a numerical model of quantum transport in depletion-all-around (DAA) operation of n-InSb nanowire field effect transistor (NWFET) is developed. For incorporating quantum transport, 2D Poisson-Schrödinger equations are solved by finite element method and drain current is calculated by mode-space approach. Effects of gate and drain bias voltages and device dimensions on current-voltage...
Temperature and length scaling dependence of double gate tunnel FET has been analyzed considering the electric field of junction depletion region. In the ballistic limit Id has been found to be dominated by effective mass and insulator dielectric constant rather than bandgap. Hence, GaAs channel TFET has identified as higher current device than Si counterpart due to lower effective mass. However,...
We present a method to individually position single QDs with nanometer precision by electroosmotic flow control (EOFC). Using EOFC, we demonstrate the ability to individually select a QD from anywhere within a 100 μm control area inside a microfluidic chamber and place it at a desired position to with a 52 nm precision. The single photon emission of EOFC manipulated QDs is verified by photon anti-bunching...
We developed Optical pH regulation using gel tool impregnated with photochromic material for selective cell injection of nanosensor for intracellular measurement. The nanosensor was included in the fusogenic liposome. Membrane fusion of the liposome to the cell membrane was used for invasive cell injection of the nanosensor. The liposome fuses to the cell in weak acidic condition. Local pH regulation...
Successful commercialization of Nanosystems based devices largely depends on the development of manufacturing tools and strategies that address micro and nanoscale integration challenges at systems level. The present work brings out some of the challenges involved in accomplishing this, and presents both hardware and software based strategies used to accomplish this integration. Assembly at the nanoscale...
Cell tensegrity model has been widely accepted as a qualitative and recently quantitative method to describe the cellular mechanics. It is based on the fact the cell body is an inhomogeneous cytoskeleton based structure bounded by a soft membrane. Cell establishes force balance under certain structural arrangement through its focal adhesions and intercellular adhesions, under which the prestress is...
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