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Title: Development of functionalised multiwalled carbon nanotube polyaniline composites for electrical applications
Researcher: Sobha, A.P.
Guide(s): Prof. (Dr.) Sunil K. Narayanankutty
Keywords: Carbon nanotubes
Conducting Polymers
Morphology studies
MWCNT-Polymer composites
Nano Science
University: Cochin University of Science and Technology
Completed Date: 26/08/2015
Abstract: Combining intrinsically conducting polymers with carbon nanotubes newline(CNT) helps in creating composites with superior electrical and thermal newlinecharacteristics. These composites are capable of replacing metals and newlinesemiconductors as they possess unique combination of electrical conductivity, newlineflexibility, stretchability, softness and bio-compatibility. Their potential newlinefor use in various organic devices such as super capacitors, printable newlineconductors, optoelectronic devices, sensors, actuators, electrochemical newlinedevices, electromagnetic interference shielding, field effect transistors, newlineLEDs, thermoelectrics etc. makes them excellent substitutes for present day newlinesemiconductors. newlineHowever, many of these potential applications have not been fully newlineexploited because of various open ended challenges. Composites meant for newlineuse in organic devices require highly stable conductivity for the longevity of newlinethe devices. CNT when incorporated at specific proportions, and with newlinespecial methods contributes quite positively to this end. newlineThe increasing demand for energy and depleting fossil fuel reserves newlinehas broadened the scope for research into alternative energy sources. A newlineunique and efficient method for harnessing energy is thermoelectric energy newlineconversion method. Here, heat is converted directly into electricity using a newlineclass of materials known as thermoelectric materials. Though polymers have newlinelow electrical conductivity and thermo power, their low thermal conductivity newlinefavours use as a thermoelectric material. The thermally disconnected, but newlineelectrically connected carrier pathways in CNT/Polymer composites can satisfy the so-called phonon-glass/electron-crystal property required for newlinethermoelectric materials. newlineStrain sensing is commonly used for monitoring in engineering, newlinemedicine, space or ocean research. Polymeric composites are ideal candidates newlinefor the manufacture of strain sensors. Conducting elastomeric composites newlinecontaining CNT are widely used for this application. These CNT/Polymer newlinecomposites offer resistance change over a large strain range due to the low newlineYoungand#8223;s modulus and higher elasticity. They are also capable of covering newlinesurfaces with arbitrary curvatures. newlineDue to the high operating frequency and bandwidth of electronic newlineequipments electromagnetic interference (EMI) has attained the tag of an newline environmental pollutantand#8223;, affecting other electronic devices as well as newlineliving organisms. Among the EMI shielding materials, polymer composites newlinebased on carbon nanotubes show great promise. High strength and stiffness, newlineextremely high aspect ratio, and good electrical conductivity of CNT make newlineit a filler of choice for shielding applications. A method for better dispersion, newlineorientation and connectivity of the CNT in polymer matrix is required to newlineenhance conductivity and EMI shielding. newlineThis thesis presents a detailed study on the synthesis of functionalised newlinemultiwalled carbon nanotube/polyaniline composites and their application newlinein electronic devices. The major areas focused include DC conductivity newlineretention at high temperature, thermoelectric, strain sensing and electromagnetic newlineinterference shielding properties, thermogravimetric, dynamic mechanical newlineand tensile analysis in addition to structural and morphological studies. newline
Pagination: P:214
Appears in Departments:Department of Polymer Science & Rubber Technology

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01_title.pdfAttached File718.47 kBAdobe PDFView/Open
02_certificate.pdf1.22 MBAdobe PDFView/Open
03_ certificate.pdf1.1 MBAdobe PDFView/Open
04_ acknowledgements.pdf91.53 kBAdobe PDFView/Open
05_ preface.pdf523.15 kBAdobe PDFView/Open
06_contents.pdf1.03 MBAdobe PDFView/Open
07_chapter 1.pdf1.89 MBAdobe PDFView/Open
08_chapter 2.pdf1.74 MBAdobe PDFView/Open
09_chapter 3.pdf2.64 MBAdobe PDFView/Open
10_chapter 4.pdf2.58 MBAdobe PDFView/Open
11_chapter 5.pdf2.27 MBAdobe PDFView/Open
12_chapter 6.pdf1.88 MBAdobe PDFView/Open
13_chapter 7.pdf1.26 MBAdobe PDFView/Open
14_ abbreviations.pdf730.67 kBAdobe PDFView/Open
15_ list of publications.pdf1.41 MBAdobe PDFView/Open

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