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Sensing Technology Needs in Long-Term Human Space Exploration
Online Presentations | 27 Jul 2005 | Contributor(s): Antony Jeevarajan
The sensing technologies are mainly derived from three broad areas, namely, absorbance, fluorescence and electrochemical. The development of a sensing system with unique requirements for space applications in these areas will be addressed. The application of these sensing systems in Tissue...
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Introduction to BioMEMS and Bionanotechnology
Online Presentations | 27 Jul 2005 | Contributor(s): Rashid Bashir
BioMEMS and Bionanotechnology have the potential to make significant impact in a wide range of fields and applications. This lecture series introduces the basic concepts and topics underlying the interdisciplinary areas of BioMEMS and Bionanotechnology. Advances in this field require the...
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Fine Tuning Microcantilever Vibrations for Ultrasensitive Analyte Mass Detection
Online Presentations | 27 Jul 2005 | Contributor(s): Arvind Raman
Microcantilever based biochemical sensing has shown tremendous promise for ultrasenstive detection in both liquid and ambient conditions. However improving the sensitivity, reliability and robustness of these sensors so they can achieve their potential needs substantial efforts in (a) chemical...
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Sensitivity Amplification in Biosensors using Nanoparticles and Enzymatic Macromolecules
Online Presentations | 27 Jul 2005 | Contributor(s): Cagri Savran
We present non-invasive methods for improving the sensitivity of label-free biosensors that offer the advantage of rapid and real-time detection but suffer from relatively low sensitivity. We present detection of cancer markers using the Quartz Crystal Microbalance and demonstrate that 2...
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A New Terahertz Heterodyne Detector Based on Single-Walled Carbon Nanotubes
Online Presentations | 27 Jul 2005 | Contributor(s): Sigfrid Yngvesson
We present non-invasive methods for improving the sensitivity of label-free biosensors that offer the advantage of rapid and real-time detection but suffer from relatively low sensitivity. We present detection of cancer markers using the Quartz Crystal Microbalance and demonstrate that 2...
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Nanofactories - In - Situ Production of Therapeutic Genes...
Online Presentations | 27 Jul 2005 | Contributor(s): James Leary
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Organic Electronics Part I: Chemical Modulation
Online Presentations | 27 Jul 2005 | Contributor(s): Jiri Janata
Organic semiconductors (OS) have been in the center of attention in at least two areas: in chemical ,sensors and in molecular electronics. Although the chemistry and physics governing them is the same their performance characteristics are apparently measured on different scales. Electrochemical...
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Tuning of Electronic Properties of Organic Semiconductors...
Online Presentations | 27 Jul 2005 | Contributor(s): Karin Potje-Kamloth
Intrinsic conducting polymers are key components in organic electronic devices. These materials are also known to be sensitive toward a variety of gases and vapors, which can be exploited by incorporation as chemical sensitive element in a nanoscale sensing system. The molecular interaction...
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Nanostructure Engineered Sensors for Gas Detection in Space and Terrestrial Applications
Online Presentations | 28 Jul 2005 | Contributor(s): Jing Li
A nanosensor technology has been developed using single walled carbon nanotubes (SWNTs) on a pair of interdigitated electrodes (IDE) processed with a silicon-based microfabrication and micromachining technique. These sensors have been exposed to nitrogen dioxide, methane, acetone, benzene,...
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Top-Metal/Molecular Monolayer Interactions and Final Device Performance
Online Presentations | 28 Jul 2005 | Contributor(s): Curt A Richter
The top-metal/molecular-monolayer interface is of critical importance in the formation of molecular electronic (ME) devices and test structures. I will discuss two experimental studies of ME devices in which the final device performance can be attributed to top-metal/molecule interactions:...
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Towards Molecular Electronic Circuitry: Selective Deposition of Metals on Patterned ...
Online Presentations | 28 Jul 2005 | Contributor(s): Amy Walker
We have developed a robust method by which to construct complex two- and three- dimensional structures based on controlling interfacial chemistry. This work has important applications in molecular/organic electronics, sensing, and other technologies. Our method is extensible to many different...
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Organic Electronics Part II: Electric Field Modulation
Online Presentations | 28 Jul 2005 | Contributor(s): Jiri Janata
A solid state platform has been designed and fabricated that allows characterization of candidate organic semiconductor materials used in organic field-effect transistors (OFET). A systematic experimental protocol has been outlined that allows the separation of contribution of contact resistance...
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Synthetic and Processing Strategies to New Molecular and Polymeric...
Online Presentations | 28 Jul 2005 | Contributor(s): Antonio Facchetti, Tobin Marks
Recent achievements in the design and synthesis of new arene/heteroaromatic oligomers/molecules functionalized with a variety of phenacyl, alkylcarbonyl, and perfluoroalkylcarbonyl will be presented. These organic semiconductors exhibit low-lying LUMOs allowing efficient electron...
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A Novel Diagnostic Assay Based On Nanomechanics
Online Presentations | 28 Jul 2005 | Contributor(s): Marko Dorrestijn
Micro-fabricated silicon cantilevers arrays offer a novel label-free approach where ligand-receptor binding interactions occurring on the sensor generate nanomechanical signals like bending or a change in mass that is optically detected in-situ. We report the detection of multiple unlabelled...
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DNA Charge Motion: Regimes and Behaviors
Online Presentations | 28 Jul 2005 | Contributor(s): Mark Ratner
Because DNA is a quasi-one-dimensional species, and because each base is a pi-type chromphore, it was long ago suggested that DNA could conduct electricity. This has become a widely investigated area, and remains of interest for fundamental science and for applications. We will discuss a very...
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Measurement of Single Molecule Conductance using STM-Based Break Junctions
Online Presentations | 28 Jul 2005 | Contributor(s): Nongjian Tao
We have measured single molecule conductance using a combined STM- and conducting AFM-based break junction method. The method works in aqueous solutions, which is suitable for biologically relevant molecules such as DNA and peptides, and also allows us to control electron transport through redox...
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Basic Electronic Properties of DNA
Online Presentations | 28 Jul 2005 | Contributor(s): M. P. Anantram
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Electrical Conduction through dsDNA-Molecule with Nanoscale Break Junctions
Online Presentations | 28 Jul 2005 | Contributor(s): Ajit Kumar Mahapatro, Kyung Jae Jeong, Sugata Bhattacharya, Gil Lee, David Janes
Measuring the electrical conductivity through a specific strand of DNA is of great interest to the nano-science and engineering community. This work focuses on the electrical conduction through 15 base-pair, double helix oligo-nucleotides with various sequences. The current-voltage...
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Novel Magnetic Materials for Biomolecular Diagnostics
Online Presentations | 28 Jul 2005 | Contributor(s): Gil Lee, David Janes, Sugata Bhattacharya, Kyung Jae Jeong, D. M. Oh, W. S. Chang
Paramagnetic particles have emerged as important tools for cell sorting,protein separation, and single molecule measurements. The particles used inthese applications must meet the following requirements: uniform in size,highly paramagnetic, stable in physiological salt buffer, functionizable,and...
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Field Regulation of Single Molecule Conductivity by a Charged Atom
Online Presentations | 29 Jul 2005 | Contributor(s): Robert Wolkow
A new concept for a single molecule transistor is demonstrated. A single chargeable atom adjacent to a molecule shifts molecular energy levels into alignment with electrode levels, thereby gating current through the molecule. Seemingly paradoxically, the silicon substrate to which the molecule...
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Probing Silicon-Based Molecular Electronics with Scanning Tunneling Microscopy
Online Presentations | 29 Jul 2005 | Contributor(s): Mark Hersam
In recent years, substantial progress has occurred in the field of molecular electronics [1]. In this paper, charge transport through molecule-semiconductor junctions is probed with ultra-high vacuum (UHV) scanning tunneling microscopy (STM). The presence of the semiconductor band gap enables new...