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Evaluation Of Chemically Sensitive Field Effect Transistors For Detection Of Organophosphorus Compounds
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Book Synopsis Evaluation of Chemically-sensitive Field-effect Transistors for Detection of Organophosphorus Compounds by : Jenny E. Shin (CAPT, USAF.)
Download or read book Evaluation of Chemically-sensitive Field-effect Transistors for Detection of Organophosphorus Compounds written by Jenny E. Shin (CAPT, USAF.) and published by . This book was released on 1989 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Impedance Modulation of Thin Films with a Chemically-sensitive Field-effect Transistor by : John M. Wiseman
Download or read book Investigation of the Impedance Modulation of Thin Films with a Chemically-sensitive Field-effect Transistor written by John M. Wiseman and published by . This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study resulted in the design and fabrication of a Chemically-Sensitive Field-Effect Transistor (CHEMFET) with an interdigitated gate electrode structure. The electrical performance of the CHEMFET, both in the time-domain and frequency domain, was evaluated for detecting changes in the molecular structure and chemical composition in three thin films: an epoxy, copper phthalocyanine (CuPc), and acetylcholinesterase (ACHE). The change in the chemical state of a film was manifested as a change in the electrical impedance of the interdigitated gate electrode structure. For the epoxy, its molecular structure changed as a result of the curing reaction. To induce a change in the chemical state of the CuPc and ACHE films they were exposed to part-per billion concentrations of a challenge gas, either nitrogen dioxide (NO2) or the the organophosphorus compound, diisopropyl methylphosphonate (DIMP). The results clearly show that the CHEMFET can detect chemical and structural changes in an epoxy and CuPc film. The sensitivity of the ACHE film was not unequivocally determined due to long term drift in the ACHE film's electrical properties. The most remarkable result of this effort was the demonstration of a unique selectivity feature in the CHEMFET's frequency dependent response to a challenge gas. The examination of the relative changes in the electrical properties of the CHEMFET at different frequencies showed that the CHEMFET can be used to distinguish between NO2 and Dimp EXPOSURE. Theses. (RH).
Book Synopsis Toxicological profile for diisopropyl methylphosphonate by :
Download or read book Toxicological profile for diisopropyl methylphosphonate written by and published by . This book was released on 1998 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This public health statement tells you about diisopropyl methylphosphonate and the effects of exposure. Diisopropyl methylphosphonate, or DIMP, is a chemical by-product resulting from the manufacture and detoxification of GB (also called Sarin), a nerve gas that the Army produced from 1953 to 1957.
Book Synopsis Evaluation of Doped Phthalocy Anines and a Chemically-sensitive Field-effect Transistor for Detecting Nitrogen Dioxide by : Thomas J. Jenkins (CAPT, USAF.)
Download or read book Evaluation of Doped Phthalocy Anines and a Chemically-sensitive Field-effect Transistor for Detecting Nitrogen Dioxide written by Thomas J. Jenkins (CAPT, USAF.) and published by . This book was released on 1989 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of an Interdigitated Gate Electrode Field-Effect Transistor for Detecting Organophosphorus Compounds by :
Download or read book Evaluation of an Interdigitated Gate Electrode Field-Effect Transistor for Detecting Organophosphorus Compounds written by and published by . This book was released on 1990 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study used integrated circuit microsensors to detect organophosphorus compounds. Chemically-sensitive thin films, copper phthalocyanine, DFPase, succinyl chloride, succinylcholine chloride, 2- naphthol(B), and L-histidine dihydrochloride, were deposited on interdigitated gate electrode (IGE) structures, with an average thickness of 2000A. Thin film electrical performance characteristics were measured for several parameters, including: DC resistance, AC impedance, time-domain, and spectral responses from 10 Hz to 1 MHz. Each microsensor contained nine IGEs; each IGE possessed an in situ field-effect transistor amplifier. After purging each sensor with filtered air, it was exposed to one or two of the following gases: diisopropyl fluorophosphate (DFP), diisopropyl methylphosphonate, and dimethyl methylphosphonate at concentrations spanning 100 ppb to 10 ppm (at 90% relative humidity and 23 deg C). Testing was conducted with microsensors heated to 30, 50, and 70 degrees C. All six candidate films, demonstrated various degrees of sensitivity to the challenge gases at 30 degrees C. DFPase was especially sensitive to the challenge gases at 100 ppb. Only copper phthalocyanine and L- histidine dihydrochloride demonstrated sensitivity above 30 degrees C. In particular 2-naphthol(B) showed complete reversibility and succinyl chloride demonstrated partial reversibility at 30 deg C. Copper phthalocyanine was reversible only at 70 deg C. Succinylcholine chloride demonstrated a unique band-reject filter response to the presence of DFP in any challenge gas sample.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1990-03 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrochemistry of Chemically Sensitive Field Effect Transistors by : Jiri Janata
Download or read book Electrochemistry of Chemically Sensitive Field Effect Transistors written by Jiri Janata and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is shown that ISFETs are closely related to conventional ion selective electrodes. The time response characteristics of these devices are examined in detail. The possibility of their use as direct charge sensors is critically evaluated. (Author).
Book Synopsis Investigation of the Sensitivity, Selectivity, and Reversibility of the Chemically-Sensitive Field-Effect Transistor (CHEMFET) to Detect Nitrogen Dioxide, Dimethyl Methylphosphonate, and Boron Trifluoride by :
Download or read book Investigation of the Sensitivity, Selectivity, and Reversibility of the Chemically-Sensitive Field-Effect Transistor (CHEMFET) to Detect Nitrogen Dioxide, Dimethyl Methylphosphonate, and Boron Trifluoride written by and published by . This book was released on 1993 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigated the sensitivity, selectivity, and reversibility of a chemically-sensitive field-effect transistor (CHEMFET) gas microsensor. Various physical operating parameters were tested to determine which produced the most significant sensitivity, selectivity, and reversibility which were computed from response changes generated from electrical conductivity modulations when exposed to challenge gases. The variable operating parameters included: thinfilm material, film thickness, challenge gas specie, challenge gas concentration, and operating temperature. Copper phthalocyanine and lead phthalocyanine were used as thin films to detect the following challenge gases: nitrogen dioxide, dimethyl methylphosphonate, boron trifluoride, methanol, carbon monoxide, vinyl chloride, and trichloroethylene. Tests revealed that copper phthalocyanine was the most sensitive to dimethyl methylphosphonate and boron trifluoride, whereas lead phthalocyanine was the most sensitive to the remaining challenge gases. The CHEMFET was selective to the binary challenge gas combinations. The films were most selective for nitrogen dioxide. The CHEMFET was fully reversibly, and the time duration for full reversibility increased with increasing challenge gas concentrations and increasing time of exposure.
Book Synopsis Investigation of the Sensitivity, Selectivity, and Reversibility of the Chemically-sensitive Field-effect Transistor (CHEMFET) to Detect Nitrogen Dioxide, Dimethyl Methylphosphonate, and Boron Trifluoride by : Neal Terence Hauschild (2LT, USAF.)
Download or read book Investigation of the Sensitivity, Selectivity, and Reversibility of the Chemically-sensitive Field-effect Transistor (CHEMFET) to Detect Nitrogen Dioxide, Dimethyl Methylphosphonate, and Boron Trifluoride written by Neal Terence Hauschild (2LT, USAF.) and published by . This book was released on 1993 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microelectrodes and Chemically Sensitive Field Effect Transistors by : John Cassidy
Download or read book Microelectrodes and Chemically Sensitive Field Effect Transistors written by John Cassidy and published by . This book was released on 1985 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Approaches and Evaluation of Architectures for Chemical and Biological Sensing Based on Organic Thin-film Field-effect Transistors and Immobilized Ion Channels Integrated with Silicon Solid-state Devices by : Daniel Hayes Fine
Download or read book Approaches and Evaluation of Architectures for Chemical and Biological Sensing Based on Organic Thin-film Field-effect Transistors and Immobilized Ion Channels Integrated with Silicon Solid-state Devices written by Daniel Hayes Fine and published by . This book was released on 2007 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is significant need to improve the sensitivity and selectivity for detecting chemical and biological agents. This need exists in a myriad of human endeavors, from the monitoring of production of consumer products to the detection of infectious agents and cancers. Although many well established methodologies for chemical and biological sensing exist, such as mass spectrometry, gas or liquid phase chromatography, enzymelinked immunosorbent (ELISA) assays, etc., it is the goal of the work described herein to outline aspects of two specific platforms which can add two very important features, low cost and portability. The platforms discussed in this dissertation are organic semiconductor field-effect transistors (OFETS), in various architectural forms and chemical modifications, and ion channels immobilized in tethered lipid bilayers integrated with solid state devices. They take advantage of several factors to make these added features possible, low cost manufacturing techniques for producing silicon and organic circuits, low physical size requirements for the sensing elements, the capability to run such circuits on low power, and the ability of these systems to directly transduce a sensing event into an electrical signal, thus making it easier to process, interpret and record a signal. In the most basic OFET functionality, many types of organic semiconductors can be used to produce transistors, each with a slightly different range of sensitivities. When used in concert, they can produce a reversible chemical "fingerprint". These OFETS can also be integrated with silicon transistors - in a hybrid device architecture - to enhance their sensitivity while maintaining their reversibility. The organic semiconductors themselves can be chemically altered with the use of small molecule receptors designed for specific chemicals or chemical functional groups to greatly enhance the interaction of these molecules with the transistor. This increases both sensitivity and selectivity for discrete devices. Specially designed nanoscale OFET configurations with individually addressable gates can enhance the sensitivity of OFETS as well. Finally, ion channels can be selected for immobilization in tethered lipid bilayer sensors which are already inherently sensitive to the analyte of choice or can be genetically modified to include receptors for many kinds of chemical or biological agents.
Book Synopsis Chemically Sensitive Silicon Nanowire Field Effect Transistors Linked with Microfluidic Channels for Enhanced Detection by :
Download or read book Chemically Sensitive Silicon Nanowire Field Effect Transistors Linked with Microfluidic Channels for Enhanced Detection written by and published by . This book was released on 2014 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Chemically Sensitive Field-effect Transistor Arrays and Selective Materials by : Brian Joseph Polk
Download or read book Development of Chemically Sensitive Field-effect Transistor Arrays and Selective Materials written by Brian Joseph Polk and published by . This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1975 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the IEEE 1992 National Aerospace and Electronics Conference, NAECON 1992 by :
Download or read book Proceedings of the IEEE 1992 National Aerospace and Electronics Conference, NAECON 1992 written by and published by . This book was released on 1992 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Chemistry of Chemically Sensitive Field Effect Transistors by : Mark S. Wrighton
Download or read book Surface Chemistry of Chemically Sensitive Field Effect Transistors written by Mark S. Wrighton and published by . This book was released on 1987 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report highlights the research accomplishments in connection with studies of microelectrochemical devices including transistors and diodes. A bibiliography of published work in connection with the contract is included.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
