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    III-Nitride Membranes for Thermal Bio-Sensing and Solar Hydrogen Generation

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    Name:
    PhD thesis final Rami.pdf
    Size:
    7.126Mb
    Format:
    PDF
    Description:
    Final Dissertation
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    Type
    Dissertation
    Authors
    Elafandy, Rami T. cc
    Advisors
    Ooi, Boon S. cc
    Committee members
    Alshareef, Husam N. cc
    Salama, Khaled N. cc
    Merzaban, Jasmeen cc
    Gan, Qiaoqiang
    Program
    Electrical and Computer Engineering
    KAUST Department
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Date
    2017-09
    Embargo End Date
    2018-10-01
    Permanent link to this record
    http://hdl.handle.net/10754/625485
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation became available to the public after the expiration of the embargo on 2018-10-01.
    Abstract
    III-nitride nanostructures have generated tremendous scientific and technological interests in studying and engineering their low dimensional physics phenomena. Among these, 2D planar, free standing III-nitride nanomembranes are unrivalled in their scalability for high yield manufacture and can be mechanically manipulated. Due to the increase in their surface to volume ratio and the manifestation of quantum phenomena, these nanomembranes acquire unique physical properties. Furthermore, III-nitride membranes are chemically stable and biocompatible. Finally, nanomembranes are highly flexible and can follow curvilinear surfaces present in biological systems. However, being free-standing, requires especially new techniques for handling nanometers or micrometers thick membrane devices. Furthermore, effectively transferring these membrane devices to other substrates is not a direct process which requires the use of photoresists, solvents and/or elastomers. Finally, as the membranes are transferred, they need to be properly attached for subsequent device fabrications, which often includes spin coating and rinsing steps. These engineering complications have impeded the development of novel devices based on III-nitride membranes. In this thesis, we demonstrate the versatility of III-nitride membranes where we develop a thermal bio-sensor nanomembrane and solar energy photo-anode membrane. First, we present a novel preparation technique of nanomembranes with new characteristics; having no threading dislocation cores. We then perform optical characterization to reveal changes in their defect densities compared to the bulk crystal. We also study their mechanical properties where we successfully modulate their bandgap emission by 55 meV through various external compressive and tensile strain fields. Furthermore, we characterize the effect of phonon-boundary scattering on their thermal properties where we report a reduction of thermal conductivity from 130 to 9 W/mK. We employ these modifications to develop a thermal biosensor, which conformally gets attached to cells to measure their thermal properties. We also assess the statistical significance of our measurements to differentiate between different cell lines based on their measured thermal properties. Finally, we demonstrate the application of nanomembranes in solar-based water-splitting by merging them with nanowires to form nanowire membranes which are used to fabricate membrane photo-anodes. Finally, through optical, chemical and electrochemical measurements, we demonstrate their superior operations compared to typical fabrication techniques.
    Citation
    Elafandy, R. T. (2017). III-Nitride Membranes for Thermal Bio-Sensing and Solar Hydrogen Generation. KAUST Research Repository. https://doi.org/10.25781/KAUST-00HUD
    DOI
    10.25781/KAUST-00HUD
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-00HUD
    Scopus Count
    Collections
    PhD Dissertations; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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