Download or read book Fabrication and Characterization of a High density Carbon Nanotube Microelectrode Array for Use in an Epiretinal Prosthesis written by Adam Khalifa and published by . This book was released on 2013 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Fabrication and Characterization of a Microelectrode Array written by Lalitha Dabbiru and published by . This book was released on 2006 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microelectrode Arrays for Retinal Cell Stimulation written by Arti Patel and published by . This book was released on 2002 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microfabrication of an Implantable Silicone Microelectrode Array for an Epiretinal Prosthesis written by Mariam Nader Maghribi and published by . This book was released on 2003 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth Fabrication and Characterization of Carbon Nanotubes Nanotube Films and Nanowires written by Yongho Choi and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Furthermore these grids provide a low cost, mass producible, efficient, reliable, and versatile platform for direct TEM, AFM, SEM, and Raman analysis of as-grown nanomaterials, eliminating the need for any post-processing growth. We also explored fabrication and characterization of single-walled carbon nanotube films which are three-dimensional films of tens of nanometers thickness, consisting of an interwoven mesh of single-walled carbon nanotubes. We demonstrate, for the first time, patterning of SWNT films down to submicron lateral dimensions as small as 50 nm using e-beam lithography and inductively coupled plasma (ICP) etching. This simple and efficient "top-down" patterning capability developed could open up tremendous opportunities for integrating single-walled nanotube films into a wide range of electronic and optoelectronic devices. Furthermore, we fabricate and characterize the effect of device geometry on the dark current of metalsemiconductor- metal (MSM) photodetectors based on SWNT film-GaAs Schottky contacts. We observed that dark currents of the MSM devices scale rationally with device geometry, such as the device active area, finger width, and finger spacing. These results open up the possibility of integrating SWNT films as transparent and conductive Schottky electrodes in conventional semiconductor electronic and optoelectronic devices.

Download or read book Design Fabrication and Characterization of Microelectrodes for Brain machine Interfaces written by Erin Patrick and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The long-term goal in the design of brain-machine interfaces (BMIs) is to restore communication and control of prosthetic devices to individuals with loss of motor function due to spinal cord injuries, amyotrophic lateral sclerosis, or muscular dystrophy, for example. One of the great challenges in this effort is to develop implantable systems that are capable of processing the activity of large ensembles of cortical neurons. This work presents the design, fabrication, characterization, and in vivo testing of a neural recording platform for a pre-clinical application. The recording platform is a flexible, polyimide-based microelectrode array that can be hybrid-packaged with custom electronics in a fully-implantable form factor. Results from the microelectrode array integrated with an amplifier integrated circuit include data from in vivo neural recordings showing consistent single-unit discrimination over 42 days. Moreover, results from the electrochemical assessment of the corrosion properties of the tungsten microwire electrodes used on the microelectrode array admonish the use of tungsten in long-term implants.

Download or read book Fabrication and Interface Modeling of Carbon Nanotube coated Microelectrode Array for Sensitive Dopamine Detection written by Suwen Li and published by . This book was released on 2014 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fabrication and Characterization of Carbon Nanotubes for Biomedical Applications written by Zhiyang Rong and published by . This book was released on 2008 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Recently, nanomaterials have been vigorously studied for the development of biosensors. Among them, carbon nanotubes (CNTs) have stimulated enormous interest for constructing biosensors due to their unique physical and chemical properties such as high surface-to-volume ratio, high conductivity, high strength and chemical inertness. Our study is to develop a general design of biosensors based on vertically aligned CNT arrays. Glucose biosensor is selected as the model system to verify the design of biosensors. In the preliminary design, glucose oxidase (GOx) is attached to the walls of the porous alumina membrane by adsorption. Porous highly ordered anodized aluminum oxide (AAO) prepared by two-step anodization are used as templates. Deposited gold on both sides of template surfaces serve as a contact and prevent non-specific adhesion of GOx on the surface. In order to find out optimized thickness of gold coating, the oxidation and reduction (redox) reaction in [Fe(CN)6]3\168C /[Fe(CN)6]4\168C system is monitored by Cyclic Voltammetry (CV). Subsequently, enzymatic redox reaction in glucose solutions is also attempted by CV. We expect protein layers with GOx form a conductive network. However, no obvious enzymatic redox reaction is detected in the voltammogram. To take advantage of the attractive properties of CNTs, the design of enzyme electrodes is modified by attaching CNT onto the sidewalls of AAO template nanopores and then immobilizing GOx to the sidewalls and tips of CNTs. AAO templates provided vertical, parallel, well separated and evenly spacing nanochannels for CNT growth. Cobalt is used as a catalyst to fabricate CNTs. As a result, multi-walled carbon nanotubes (MWCNTs) are fabricated inside the AAO templates by catalytic chemical vapor deposition (CCVD). Characterization of AAO templates and cobalt electrochemical deposition are employed by scanning electron microscope (SEM), and energy dispersive X-ray spectrometry (EDS). Detailed structure and texture of CNTs are examined by transmission electron microscope (TEM).

Download or read book Fabrication and Characterization of Two Types of Micro electrode Arrays written by Neal Sleszynski and published by . This book was released on 1988 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fabrication and Characterization of Schottky Diodes Using Single Wall Carbon Nanotubes written by Brandon E. Luquette and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Density Controlled Carbon Nanotube Array Electrodes written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CNT materials comprising aligned carbon nanotubes (CNTs) with pre-determined site densities, catalyst substrate materials for obtaining them and methods for forming aligned CNTs with controllable densities on such catalyst substrate materials are described. The fabrication of films comprising site-density controlled vertically aligned CNT arrays of the invention with variable field emission characteristics, whereby the field emission properties of the films are controlled by independently varying the length of CNTs in the aligned array within the film or by independently varying inter-tubule spacing of the CNTs within the array (site density) are disclosed. The fabrication of microelectrode arrays (MEAs) formed utilizing the carbon nanotube material of the invention is also described.

Download or read book Fabrication and Characterization of Silicon Microwire Neural Electrode Arrays on Flexible Substrates written by Farid Azzazy and published by . This book was released on 2014 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neuroprosthetic devices are widely employed in clinical and research settings. However, most of these devices suffer from diminishing device performance over time, likely due to the reactive tissue response of the central nervous system and scarring to biological tissue from the implantation procedure. In an effort to minimize acute tissue trauma while maintaining high spatial resolution, this thesis presents a novel miniaturized neural implant device capable of recording high-density neural signals from cortical tissue with penetrating silicon microwire sensing elements on a flexible conformable substrate. In addition to reduced tissue scarring, it is possible to improve on current commercially available neural probe designs by reducing the mechanical property mismatch between the electrode interface and neural tissue. Neural electrodes fabricated on flexible substrates have received an increase in attention in recent years; however, these designs offer moderate spatial resolution because signals are typically recorded from the surface of neural tissue in thin film style electrode designs. The MEA presented in this thesis is fabricated by a hybrid integration technology that takes advantage of both rigid penetrating pillars, similar yet smaller than commercially available technology, and is fabricated on thin film polyimide substrates. The thin film polyimide substrate allows for the electrode to make intimate contact with surrounding cortical tissue around sulci and gyri of the brain, and the silicon microwire sensing elements, which penetrate into the cortex, enable this MEA to have the potential for the best spatial resolution. The impedance of these MEAs was characterized and found to be in the range of a few hundred kilohms making them suitable for both local field potentials and single unit recordings.

Download or read book A Carbon Nanotube Microelectrode Array for Neural Stimulation written by Ke Wang and published by . This book was released on 2006 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microelectrode Array Fabrication for Electrochemical Detection with Carbon Nanotubes written by James Clark and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High density Stretchable Microelectrode Arrays written by Liang Guo and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerous applications in neuroscience research and neural prosthetics, such as retinal prostheses, spinal-cord surface stimulation for prosthetics, electrocorticogram (ECoG) recording for epilepsy detection, etc., involve electrical interaction with soft excitable tissues using a surface stimulation and/or recording approach. These applications require an interface that is able to set up electrical communications with a high throughput between electronics and the excitable tissue and that can dynamically conform to the shape of the soft tissue. Being a compliant and biocompatible material with mechanical impedance close to that of soft tissues, polydimethylsiloxane (PDMS) offers excellent potential as the substrate material for such neural interfaces. However, fabrication of electrical functionalities on PDMS has long been very challenging.

Download or read book Lokale chemische Stimulation von Zelllinien durch Dispensieren von Tropfen mit dem StimuDrop written by Ramona Samba and published by . This book was released on 2013 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Closing the Loop Around Neural Systems written by Steve M Potter and published by Frontiers Media SA. This book was released on 2014-12-03 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closed-loop neurophysiology has been accelerated by recent software and hardware developments and by the emergence of novel tools to control neuronal activity with spatial and temporal precision, in which stimuli are delivered in real time based on recordings or behavior. Real-time stimulation feedback enables a wide range of innovative studies of information processing and plasticity in neuronal networks. This Research Topic e-Book comprises 16 Original Research Articles, seven Methods Articles, and seven Reviews, Mini- Reviews, and Perspectives, all peer-reviewed and published in Frontiers in Neural Circuits. The contributions deal with closed loop neurophysiology experiments at a variety of levels of neural circuit complexity. Some include modeling and theoretical analyses. New enabling technologies and techniques are described. Novel work is presented from experiments in vitro, in vivo, and in humans, along with their clinical and technological implications for improving the human condition.