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Articles 1 - 11 of 11
Full-Text Articles in Nanotechnology Fabrication
Hybrid Plasmonic Nanoantennas: Fabrication, Characterization, And Application, Shengjie Zhai
Hybrid Plasmonic Nanoantennas: Fabrication, Characterization, And Application, Shengjie Zhai
UNLV Theses, Dissertations, Professional Papers, and Capstones
As optical counterpart of microwave antennas, plasmonic nanoantennas are important nanoscale devices for converting propagating optical radiation into confined/enhanced electromagnetic fields. Presently, nanoantennas, with a typical size of 200-500 nm, have found their applications in bio-sensing, bio-imaging, energy harvesting, and disease cure and prevention. With the device feature size of next generation IC goes down to 22 nm or smaller, and biological/chemical sensing reaches the Gene’s level, the sizes of the corresponding nanoantennas have to be scaled down to sub-100nm level. In the literature, these sub-100nm nanoantennas are referred as deep subwavelength nanoantennas as size of such miniaturized nanoantennas is …
Thermally Actuated Resonant Silicon Crystal Nanobalances, Arash Hajjam
Thermally Actuated Resonant Silicon Crystal Nanobalances, Arash Hajjam
Electronic Theses and Dissertations
As the potential emerging technology for next generation integrated resonant sensors and frequency references as well as electronic filters, micro-electro-mechanical resonators have attracted a lot of attention over the past decade. As a result, a wide variety of high frequency micro/nanoscale electromechanical resonators have recently been presented. MEMS resonators, as low-cost highly integrated and ultra-sensitive mass sensors, can potentially provide new opportunities and unprecedented capabilities in the area of mass sensing. Such devices can provide orders of magnitude higher mass sensitivity and resolution compared to Film Bulk Acoustic resonators (FBAR) or the conventional quartz and Surface Acoustic Wave (SAW) resonators …
Fabrication And Characterization Of Vertically Aligned Carbon Nanofibers (Vacnf) As Amperometric Biosensors On A Silicon-Compatible Platform, Kimberly Caitlin Macarthur
Fabrication And Characterization Of Vertically Aligned Carbon Nanofibers (Vacnf) As Amperometric Biosensors On A Silicon-Compatible Platform, Kimberly Caitlin Macarthur
Masters Theses
This thesis presents fabrication, characterization and initial results of vertically aligned carbon nanofibers (VACNF)-based electrodes for use as electrochemical sensors. VACNFs are nanostructures that can be fabricated to the desired specifications using a plasma-enhanced chemical-vapor deposition process and are ideal candidates for electrode material because of their excellent electrical and structural properties. The first step of the fabrication of VACNFs on silicon substrates involved photolithography to pattern the interconnects and the catalysts (nickel dots). VACNFs were then grown on silicon substrates from the nickel catalysts, whose size determines the growth of a single nanofiber or a forest of nanofibers. This …
Molecular Dynamics Study Of Diffusion Of O2 Penetrates In Uncrosslinked Polydimethysiloxane (Pdms), Crosslinked Pdms, And Pdms-Based Nanocomposites, Varun Ullal
Graduate Theses and Dissertations
Molecular dynamics simulations are used to study diffusion of O2 molecules in pure polydimethysiloxane (PDMS), crosslinked PDMS, and PDMS-based nanocomposites. The PDMS chains and penetrates are modeled using a hybrid interatomic potential which treats the Si-O atoms along the chain backbone explicitly while coarse-graining the methyl side groups and penetrates. By tracking the diffusion of penetrates in the system and subsequently computing their mean-squared displacement, diffusion coefficients are obtained. In pure PDMS models of varying molecular weight, diffusivity of the O22 penetrates is found to have an inverse relationship with chain length. Simulation models with longer chains …
Plasma-Assisted Molecular Beam Epitaxial Growth Of Indium Nitride For Future Device Fabrication, Steven Paul Minor
Plasma-Assisted Molecular Beam Epitaxial Growth Of Indium Nitride For Future Device Fabrication, Steven Paul Minor
Graduate Theses and Dissertations
The need for energy conservation has heightened the search for new materials that can reduce energy consumption or produce energy by the means of photovoltaic cells. III-nitride alloys show promise for these applications due to their generally good transport properties and ability to withstand high power applications. Along with these, this family of semiconductor alloys has a direct bandgap energy range (0.7-6.2 eV) which spans the entire visible spectrum and encompasses a large portion of the available solar spectrum. Of the three root III-nitride semiconductors, AlN, GaN, and InN, InN has only recently become attainable epitaxially with qualities good enough …
Use Of Ultra High Vacuum Plasma Enhanced Chemical Vapor Deposition For Graphene Fabrication, Shannen Adcock
Use Of Ultra High Vacuum Plasma Enhanced Chemical Vapor Deposition For Graphene Fabrication, Shannen Adcock
Graduate Theses and Dissertations
Graphene, what some are terming the "new silicon", has the possibility of revolutionizing technology through nanoscale design processes. Fabrication of graphene for device processing is limited largely by the temperatures used in conventional deposition. High temperatures are detrimental to device design where many different materials may be present. For this reason, graphene synthesis at low temperatures using plasma-enhanced chemical vapor deposition is the subject of much research. In this thesis, a tool for ultra-high vacuum plasma-enhanced chemical vapor deposition (UHV-PECVD) and accompanying subsystems, such as control systems and alarms, are designed and implemented to be used in future graphene growths. …
High Frequency Characterization Of Carbon Nanotube Networks For Device Applications, Emmanuel Decrossas
High Frequency Characterization Of Carbon Nanotube Networks For Device Applications, Emmanuel Decrossas
Graduate Theses and Dissertations
This work includes the microwave characterization of carbon nanotubes (CNTs) to design new CNTs-based high frequency components. A novel developed method to extract the electrical properties over a broad microwave frequency band from 10 MHz to 50 GHz of carbon nanotubes (CNTs) in a powder form is performed. The measured scattering parameters (S-parameters) with a performance network analyzer are compared to the simulated one obtained from an in-house computed mode matching technique (MMT). An optimized first order gradient method iteratively changes the unknown complex permittivity parameters to map the simulated S-parameters with the measured one until convergence criteria are satisfied. …
Fabrication Of Vertical Silicon Nanowires Through Metal Assisted Deposition, Matthew Garett Young
Fabrication Of Vertical Silicon Nanowires Through Metal Assisted Deposition, Matthew Garett Young
Graduate Theses and Dissertations
Controlled and ordered growth of Si nanowires through a low temperature fabrication method compatible with CMOS processing lines is a highly desirable replacement to future electronic fabrication technologies as well as a candidate for a low cost route to inexpensive photovoltaics. This stems from the fact that traditional CMOS based electronics are hitting physical barriers that are slowing the Moore's Law trend as well as the demand for an inexpensive solar cell technology that can obtain grid parity. A fractional factorial growth study is presented that compares the growth of Au and Al catalyzed Si nanowires at temperatures ranging from …
Stabilizing Acetylcholinesterase On Carbon Electrodes Using Peptide Nanotubes To Produce Effective Biosensors, Todd J. Stevens
Stabilizing Acetylcholinesterase On Carbon Electrodes Using Peptide Nanotubes To Produce Effective Biosensors, Todd J. Stevens
Theses and Dissertations
A biosensor for the detection of organophosphates in water was created by immobilizing acetylcholinesterase (AChE) on a carbon screen printed electrode using peptide nanotubes (PNT) and Nafion®. This sensor was used with acetylthiocholine (ASCh) substrate to detect the inhibitory effects of malathion. The stability of the encapsulated enzyme was measured over 50 days of storage at 4°C in a phosphate buffer solution. The oxidation of thiocholine, a product of the enzymatic reaction of ASCh and AChE, was used to measure the activity of the encapsulated enzyme. Cyclic voltammograms were taken in an ASCh and phosphate buffer solution, and the peak …
Memristor-Based Reservoir Computing, Manjari S. Kulkarni
Memristor-Based Reservoir Computing, Manjari S. Kulkarni
Dissertations and Theses
In today's nanoscale era, scaling down to even smaller feature sizes poses a significant challenge in the device fabrication, the circuit, and the system design and integration. On the other hand, nanoscale technology has also led to novel materials and devices with unique properties. The memristor is one such emergent nanoscale device that exhibits non-linear current-voltage characteristics and has an inherent memory property, i.e., its current state depends on the past. Both the non-linear and the memory property of memristors have the potential to enable solving spatial and temporal pattern recognition tasks in radically different ways from traditional binary transistor-based …
Feedback Control For Electron Beam Lithography, Yugu Yang
Feedback Control For Electron Beam Lithography, Yugu Yang
Theses and Dissertations--Electrical and Computer Engineering
Scanning-electron-beam lithography (SEBL) is the primary technology to generate arbitrary features at the nano-scale. However, pattern placement accuracy still remains poor compared to its resolution due to the open-loop nature of SEBL systems. Vibration, stray electromagnetic fields, deflection distortion and hysteresis, substrate charging, and other factors prevent the electron-beam from reaching its target position and one has no way to determine the actual beam position during patterning with conventional systems. To improve the pattern placement accuracy, spatial-phase-locked electron-beam lithography (SPLEBL) provides feedback control of electron-beam position by monitoring the secondary electron signal from electron-transparent fiducial grids on the substrate. While …