188 research outputs found
Solution-processed thin films for electronics from single-walled carbon nanotubes and graphene:
No full textSingle-walled carbon nanotubes (SWNTs) and graphene are sp2 hybridized carbon nanostructures which exhibit extraordinary electronic properties arising from their unique energy dispersions and dimensionalities. A major issue preventing implementation of these materials into integrated electronic devices is the absence of large-scale controllable synthesis and subsequent manipulation. To circumvent this issue, solution processing of SWNTs and graphene has been proposed. Deposition of thin film networks allows the realization of a new class of materials that are useful for large-area or “macro-electronics” on flexible and inexpensive platforms.
In this thesis, controllable and efficient solution-based deposition of SWNT and graphene thin film networks and their opto-electronic properties are investigated. Topics such as material dynamics in liquid, chemical structures, defects, morphology, and doping are studied utilizing various spectroscopy and microscopy analysis along with complementary electrical measurements. Further insight is provided through demonstrations of proof-of-principle thin film transistors, organic photovoltaics, and field emitters based on solution-processed SWNT and graphene thin films.Ph.D.Includes bibliographical references (p. 134-150)by Goki Ed
Transparent and conducting electrodes for organic electronics from reduced graphene oxide
No full textPartially oxidized graphene as a precursor to graphene
No full textSolution exfoliation of graphite holds promise for large-scale bulk synthesis of graphene. Non-covalent exfoliation is attractive because the electronic structure of graphene is preserved but the yield is low and the lateral dimensions of the sheets are small. Chemical exfoliation via formation of graphite oxide is a highly versatile and scalable route but the covalent functionalization of graphene with oxygen significantly alters the properties. Here, we report a new method for large-scale facile synthesis of micron-sized partially oxidized graphene (POG) sheets with dramatically improved electronic properties compared to other solution-phase exfoliated graphene. Due to low initial oxygen content (∼12%), POG requires only mild annealing (<300 °C) to achieve a sheet resistance of 28 kΩ sq-1 at the neutrality point, only a factor of ∼4 larger than the intrinsic sheet resistance of pristine graphene (∼6 kΩ sq-1) and substantially lower than graphene exfoliated by other methods. Such a partial oxidation approach opens up new promising routes to solution based high-performance, low temperature, transparent and conducting graphene-based flexible electronics. © 2011 The Royal Society of Chemistry
LIGHT-MATTER INTERACTION IN 2D SEMICONDUCTORS AND PHOTONIC DEVICE IMPLEMENTATION
No full textPh.DDOCTOR OF PHILOSOPHY (FOS
MEASURING TIME-RESOLVED POLARISATION-SENSITIVE NONLINEAR PROCESSES IN 2D MATERIALS
No full textMaster'sMASTER OF SCIENCE (RSH-FOS
CLASSICAL AND QUANTUM TRANSPORT PROPERTIES OF SEMICONDUCTING TRANSITION METAL DICHALCOGENIDE NANOSHEETS
No full textPh.DDOCTOR OF PHILOSOPH
PHONONS AND EXCITONS IN 2D TRANSITION METAL DICHALCOGENIDES
No full textPh.DDOCTOR OF PHILOSOPHY (FOS
SINGLE IMPURITY TUNNELING CURRENT AND PHOTOCURRENT MEASUREMENT IN 2D MATERIAL BY CONDUCTIVE ATOMIC FORCE MICROSCOPY
No full textPh.DDOCTOR OF PHILOSOPHY (FOS
STRUCTURAL AND CHEMICAL MODIFICATIONS OF TWO-DIMENSIONAL TRANSITION METAL DICHALCOGENIDES
Full text linkPh.DDOCTOR OF PHILOSOPH
EXCITONIC PROPERTIES OF CHEMICALLY SYNTHESIZED TWO-DIMENSIONAL ORGANIC-INORGANIC HYBRID PEROVSKITES NANOSHEETS
No full textPh.DDOCTOR OF PHILOSOPH
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