Investigation Of The Electrode Polarization Effect For Biosensor Applications, 2019 Southern Methodist University
Investigation Of The Electrode Polarization Effect For Biosensor Applications, Anil Koklu
Mechanical Engineering Research Theses and Dissertations
My research focuses on electrokinetic transport. Particularly, in this dissertation, we focus on fabrication and testing of micro electrodes with nanostructured surfaces to minimize the electrode polarization (EP) effects for biosensor applications. In the first study, electrochemical deposition of gold nanoparticles on to planar gold electrodes was used to generate rough surfaces. Dendritic nanostructures that reduced EP up to two orders of magnitude was obtained by optimizing the deposition conditions. These structures also enhanced dielectrophoresis (DEP) response of our bio-chips, making them usable in physiological buffers. In further studies we discovered a universal scaling of EP in the frequency domain ...
Structural Health Monitoring Of Composite Parts: A Review, 2019 Union College - Schenectady, NY
Structural Health Monitoring Of Composite Parts: A Review, Jacob Pessin
Structural health monitoring has the potential to allow composite structures to be more reliable and safer, then by using more traditional damage assessment techniques. Structural health monitoring (SHM) utilizes individual sensor units that are placed throughout the load bearing sections of a structure and gather data that is used for stress analysis and damage detection. Statistical time based algorithms are used to analyze collected data and determine both damage size and probable location from within the structure. While traditional calculations and life span analysis can be done for structures made of isotropic materials such as steel or other metals, composites ...
Symmetry And Dopant Diffusion In Inverted Nanopyramid Arrays For Thin Crystalline Silicon Solar Cells, 2019 University of New Mexico, Albuquerque
Symmetry And Dopant Diffusion In Inverted Nanopyramid Arrays For Thin Crystalline Silicon Solar Cells, Seok Jun Han
Chemical and Biological Engineering ETDs
In this dissertation, we enhance the efficiency of thin flexible monocrystalline silicon solar cells by breaking symmetry in light trapping nanostructures and improving homogeneity in dopant concentration profile. These thin cells are potentially less expensive than conventional thick silicon cells by using less silicon material and making the cells more convenient to be handled when supported on polymer films. Moreover, these cells are widely applicable due to their flexibility and lightweight. However, for high efficiencies, these cells require effective light trapping and charge collection. We achieve these in cells based on 14-mm-thick free-standing silicon films with light-trapping arrays of nanopyramidal ...
Plasmonic Properties Of Nanoparticle And Two Dimensional Material Integrated Structure, 2019 University of Arkansas, Fayetteville
Plasmonic Properties Of Nanoparticle And Two Dimensional Material Integrated Structure, Desalegn Tadesse Debu
Theses and Dissertations
Recently, various groups have demonstrated nano-scale engineering of nanostructures for optical to infrared wavelength plasmonic applications. Most fabrication technique processes, especially those using noble metals, requires an adhesion layer. Previously proposed theoretical work to support experimental measurement often neglect the effect of the adhesion layers. The first finding of this work focuses on the impact of the adhesion layer on nanoparticle plasmonic properties. Gold nanodisks with a titanium adhesion layer are investigated by calculating the scattering, absorption, and extinction cross-section with numerical simulations using a finite difference time domain (FDTD) method. I demonstrate that a gold nanodisk with an adhesive ...
Characterization Of Hydride Vapor Phase Epitaxy Grown Gan Substrates For Future Iii-Nitride Growth, 2019 University of Arkansas, Fayetteville
Characterization Of Hydride Vapor Phase Epitaxy Grown Gan Substrates For Future Iii-Nitride Growth, Alaa Ahmad Kawagy
Theses and Dissertations
The aim of this research is to investigate and characterize the quality of commercially obtained gallium nitride (GaN) on sapphire substrates that have been grown using hydride vapor phase epitaxy (HVPE). GaN substrates are the best choice for optoelectronic applications because of their physical and electrical properties. Even though HVPE GaN substrates are available at low-cost and create the opportunities for growth and production, these substrates suffer from large macro-scale defects on the surface of the substrate.
In this research, four GaN on sapphire substrates were investigated in order to characterize the surface defects and, subsequently, understand their influence on ...
Gd5si4-Pvdf Nanocomposite Films And Their Potential For Triboelectric Energy Harvesting Applications, 2019 Virginia Commonwealth University
Gd5si4-Pvdf Nanocomposite Films And Their Potential For Triboelectric Energy Harvesting Applications, S. M. Harstad, P. Zhao, N. Soin, A. A. El-Gendy, Shalabh Gupta, Vitalij K. Pecharsky, J. Luo, Ravi L. Hadimani
Ames Laboratory Accepted Manuscripts
The triboelectric energy generators prepared using the combination of self-polarized, high beta-phase nanocomposite films of Gd5Si4-PVDF and polyamide-6 (PA-6) films have generated significantly higher voltage of 425 V, short-circuit current density of 30 mA/m(2) and a charge density of similar to 116.7 C/m(2) as compared to corresponding values of 300 V, 30 mA/m(2) and 94.7 mu C/m(2), respectively for the pristine PVDF-(PA-6) combination. The magnetic measurements of the Gd5Si4-PVDF films display a ferromagnetic behavior as compared to diamagnetic nature of pristine PVDF. The presence of magnetic nanoparticles in the ...
Reactive Ion Etching Selectivity Of Si/Sio2: Comparing Of Two ﬂuorocarbon Gases Chf3 And Cf4, 2019 Singh Center for Nanotechnology
Reactive Ion Etching Selectivity Of Si/Sio2: Comparing Of Two ﬂuorocarbon Gases Chf3 And Cf4, Meiyue Zhang, Pat Watson
Protocols and Reports
Two reactive ion etching (RIE) processes were studied to show the relative etch selectivity between SiO2 and Si using two ﬂuorocarbon gases, CF4 and CHF3. Results show that CHF3 gives better selectivity (16:1) over CF4 (1.2 :1). On the other hand, the etch rate of SiO2 of CF4 is approximately 52.8 nm/min, faster than CHF3 (32.4 nm/min).
Fabrication And Characterization Of Nanofiber Nylon-6-Mwcnt As An Electrochemical Sensor For Sodium Ions Concentration Detection In Sweat, Kelsey Mills
Williams Honors College, Honors Research Projects
Fabrication and characterization nylon-6-MWCNT nanofiber as an electrochemical sensor to detect sodium ion concentrations specifically in sweat. Using contact angle to determine surface morphology and chronoamperometry testing to identify ideal sensor conditions, tests optimized parameters like weight percent of nylon or other polymers, carbon nanotube (CNT) isomer, and solution concentration to determine reproducibility of functional sensors. Utilizing the electric qualities of carbon nanotubes partnered with the sodium ion selectivity of calixarene treatment and polymers unique properties like flexibility and scalability create open an arena for optimizing sodium ion sensors for further development for functional prototypes. Morphology tests showed that the ...
Fabrication And Characterization Of Planar-Structure Perovskite Solar Cells, 2019 University of Kentucky
Fabrication And Characterization Of Planar-Structure Perovskite Solar Cells, Guoduan Liu
Theses and Dissertations--Electrical and Computer Engineering
Currently organic-inorganic hybrid perovskite solar cells (PSCs) is one kind of promising photovoltaic technology due to low production cost, easy fabrication method and high power conversion efficiency.
Charge transport layers are found to be critical for device performance and stability. A traditional electron transport layer (ETL), such as TiO2 (Titanium dioxide), is not very efficient for charge extraction at the interface. Compared with TiO2, SnO2 (Tin (IV) Oxide) possesses several advantages such as higher mobility and better energy level alignment. In addition, PSCs with planar structure can be processed at lower temperature compared to PSCs with other ...
Straintronic Nanomagnetic Devices For Non-Boolean Computing, 2019 Virginia Commonwealth University
Straintronic Nanomagnetic Devices For Non-Boolean Computing, Md Ahsanul Abeed
Theses and Dissertations
Nanomagnetic devices have been projected as an alternative to transistor-based switching devices due to their non-volatility and potentially superior energy-efficiency. The energy efficiency is enhanced by the use of straintronics which involves the application of a voltage to a piezoelectric layer to generate a strain which is ultimately transferred to an elastically coupled magnetostrictive nanomaget, causing magnetization rotation. The low energy dissipation and non-volatility characteristics make straintronic nanomagnets very attractive for both Boolean and non-Boolean computing applications. There was relatively little research on straintronic switching in devices built with real nanomagnets that invariably have defects and imperfections, or their adaptation ...
Synthesis And Processing Of Nanocapsules Of Single And Multiple Cancer Drugs For Targeted Cancer Therapy, 2019 Georgia Southern University
Synthesis And Processing Of Nanocapsules Of Single And Multiple Cancer Drugs For Targeted Cancer Therapy, Md Mahmudul Hasan
Electronic Theses and Dissertations
Nanonization and encapsulation of cancer drug has been an effective way of making the drug injectable for EPR based passive targeted delivery. When cancer drugs are subjected to electrospray with high voltage like 30-45kV, it forms drug nanocrystal, which has same efficacy as the normal drug. UV-Vis is used to detect the presence of drug in the sample and later on, drug release pattern over the day is found through UV-Vis as well. The effect of spraying parameter on morphology of nanocrystals are investigated using Scanning Electron Microscope (SEM). On top of that, encapsulation of chemo drug into biocompatible polymer ...
Csar 62 Spin Curve, 2018 Singh Center for Nanotechnology
Csar 62 Spin Curve, Mohsen Azadi, Georgia Griggs, Glen De Villafranca, Gerald Lopez
Protocols and Reports
No abstract provided.
Exploration Of Radiation Damage Mechanism In Mems Devices., 2018 University of Louisville
Exploration Of Radiation Damage Mechanism In Mems Devices., Pranoy Deb Shuvra
Electronic Theses and Dissertations
We explored UV, X-ray and proton radiation damage mechanisms in MEMS resonators. T-shaped MEMS resonators of different dimensions were used to investigate the effect of radiation. Radiation damage is observed in the form of resistance and resonance frequency shift of the device. The resistance change indicates a change in free carrier concentration and mobility, while the resonance frequency change indicates a change in mass and/or elastic constant. For 255nm UV radiation, we observed a persistent photoconductivity that lasts for about 60 hours after radiation is turned off. The resonance frequency also decreases 40-90 ppm during irradiation and slowly recovers ...
Genetic Algorithm Design Of Photonic Crystals For Energy-Efficient Ultrafast Laser Transmitters, 2018 University of New Mexico
Genetic Algorithm Design Of Photonic Crystals For Energy-Efficient Ultrafast Laser Transmitters, Troy A. Hutchins-Delgado
Shared Knowledge Conference
Photonic crystals allow light to be controlled and manipulated such that novel photonic devices can be created. We are interested in using photonic crystals to increase the energy efficiency of our semiconductor whistle-geometry ring lasers. A photonic crystal will enable us to reduce the ring size, while maintaining confinement, thereby reducing its operating power. Photonic crystals can also exhibit slow light that will increase the interaction with the material. This will increase the gain, and therefore, lower the threshold for lasing to occur. Designing a photonic crystal for a particular application can be a challenge due to its number of ...
Nano And Microsensors For Mammalian Cell Studies, 2018 CUNY City College
Nano And Microsensors For Mammalian Cell Studies, Ioana Voiculescu, Masaya Toda, Naoki Inomata, Takahito Ono, Fang Li
Publications and Research
This review presents several sensors with dimensions at the nano- and micro-scale used for biological applications. Two types of cantilever beams employed as highly sensitive temperature sensors with biological applications will be presented. One type of cantilever beam is fabricated from composite materials and is operated in the deflection mode. In order to achieve the high sensitivity required for detection of heat generated by a single mammalian cell, the cantilever beam temperature sensor presented in this review was microprocessed with a length at the microscale and a thickness in the nanoscale dimension. The second type of cantilever beam presented in ...
Shaped 3d Microcarriers For Adherent Cell Culture And Analysis, 2018 University of California, Los Angeles
Shaped 3d Microcarriers For Adherent Cell Culture And Analysis, Chueh-Yu Wu, Daniel Stoecklein, Aditya Kommajosula, Jonathan Lin, Keegan Owsley, Baskar Ganapathysubramanian, Dino Di Carlo
Mechanical Engineering Publications
Standard tissue culture of adherent cells is known to poorly replicate physiology and often entails suspending cells in solution for analysis and sorting, which modulates protein expression and eliminates intercellular connections. To allow adherent culture and processing in flow, we present 3D-shaped hydrogel cell microcarriers, which are designed with a recessed nook in a first dimension to provide a tunable shear-stress shelter for cell growth, and a dumbbell shape in an orthogonal direction to allow for self-alignment in a confined flow, important for processing in flow and imaging flow cytometry. We designed a method to rapidly design, using the genetic ...
Hybrid Perovskite Characterization And Device Applications., 2018 University of Louisville
Hybrid Perovskite Characterization And Device Applications., Kasun Fernando
Electronic Theses and Dissertations
Hybrid perovskites are a group of materials that has shown a great impact in the field of scientific research in the past decade due to the efficiency gain within a short period of time. Hot casting is one technique that has been producing high efficient and stable solar cells. Electrical transportation of lateral device structure by such film is explored to understand basic properties and predict possible device applications using it. Under dark, memristive ability of the film was explored using various experiments. Unique uni-polar memristor ability was observed. Using the experimental results, a model is hypothesized using the concepts ...
Selected Applications Of Silicon Nanopillar Arrays., 2018 University of New Mexico
Selected Applications Of Silicon Nanopillar Arrays., Behnam Kheyraddini Mousavi
Electrical and Computer Engineering ETDs
Interaction of optical waves with nanostructures made of various material systems has been the subject of intensive research for many years. These researches have been mainly driven by the need to make smaller optical devices and exploiting the functionalities offered by light-matter interaction in nanoscale. Majority of the nanostructures are fabricated using electron beam (e-beam) lithography that is slow and expensive. As such alternative methods have been developed to enable nanoscale fabrication faster and less expensive. Among these interferometric lithography (IL) is a relatively simple method for quick fabrication of nanostructures. As IL method generates periodic patterns, exploring the potential ...
Tissue-Engineered Vascular Grafts: Recellularisation And Surface Functionalisation With Hybrid Magnetic Nanomedicine Developed With Theranostic Potential, 2018 Royal College of Surgeons in Ireland
Tissue-Engineered Vascular Grafts: Recellularisation And Surface Functionalisation With Hybrid Magnetic Nanomedicine Developed With Theranostic Potential, Tatiane Eufrásio Da Silva
Cardiovascular Disease is the number one cause of death in the world, with a mortality rate, globally of 35.1% representing 17.6 million lives lost annually. The majority of these deaths are related to vascular diseases, such as atherosclerotic plaques, which can obstruct blood flow perfusion of organs and tissue causing serious injuries or even death. In the heart, in order to prevent heart failure, blood flow to the tissue must be restored as quickly as possible, ideally via minimally invasive interventions such as stenting or other types of angioplasty as the gold standard. However, this is not always ...
Power Dissipation Of Wse2 Field-Effect Transistors Probed By Low- Frequency Raman Thermometry, 2018 University of Massachusetts Amherst