Dissertations / Theses on the topic 'Nanostructures'
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Chang, Sehoon. "Organic/inorganic hybrid nanostructures for chemical plasmonic sensors." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39545.
Full textWiley, Benjamin J. "Synthesis of silver nanostructures with controlled shapes and properties /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/9923.
Full textJin, Kewang. "Fabrication and characterization of 1D oxide nanostructures /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20JIN.
Full textSrivastava, Devesh. "Fabrication of nanostructures and nanostructure based interfaces for biosensor application." Diss., Connect to online resource - MSU authorized users, 2008.
Find full textBude, Romain. "Synthèses et caractérisations de matériaux thermoélectriques nanostructurés." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC032/document.
Full textThe global thermoelectric markets are in expansion with a growing interest for the energy harvesting or the thermal management of electronic components. Despite numerous advantages, this technology development is limited by the materials performances. A way to improve them is to use nanostructures in order to decrease the lattice thermal conductivity.In this work, this approach is applied to bismuth telluride, material well known for its high performance around room temperature. Materials are obtained from solution synthesis of nanoparticles before hot press compaction.A first study focuses on the determination of an optimal grain size in the bulk materials. It is shown that control over the synthesis parameters allows control on the size of nanoparticles.Moreover, structural and physical analyses on the bulks after sintering show that the change of thesynthesis parameters allows control over the microstructure and thermoelectric properties of the bulks.A second study is based on the study of an optimal composition of Bi2Te3-xSex materials. Morphological analysis show a specific and complex structure with three phases in the bulks.It is postulated that these materials should have anisotropic transport properties. Consequently, their characterizations are difficult. Different characterization techniques are used in order to have a better understanding of their thermal conductivities. Thermal conductivity of the bulks is found low which confirm the interest of this approach. However the electrical conductivity is lower than the one of the materials obtained by more conventional methods. We show that the synthesis parameters of the particles can be optimized to increase the thermoelectric performances of the bulk materials
Akinyeye, Richard Odunayo. "Nanostructured polypyrrole impedimetric sensors for anthropogenic organic pollutants." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5301_1248150815.
Full textThe main aim of this study was to develop a novel strategy for harnessing the properties of electroconductive polymers in sensor technology by using polymeric nanostructured blends in the preparation of high performance sensor devices.
Mitchell, James Christopher. "DNA nanostructures." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400206.
Full textFinbow, Gerard Mark. "Modelling nanostructures." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624252.
Full textVentura, João Oliveira. "Magnetic nanostructures." Doctoral thesis, Porto : edição do autor, 2006. http://hdl.handle.net/10216/64289.
Full textVentura, João Oliveira. "Magnetic nanostructures." Tese, Porto : edição do autor, 2006. http://catalogo.up.pt/F?func=find-b&local_base=FCB01&find_code=SYS&request=000093736.
Full textYiu, Wing-ching James. "Synthesis of one-dimensional tungsten oxide nano-structures by thermal evaporation." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B32047770.
Full textMarceau, Ross K. W. "Design in light alloys by understanding solute clustering processes during the early stages of age hardening in Al-Cu-Mg alloys." Connect to full text, 2008. http://ses.library.usyd.edu.au/handle/2123/4008.
Full textTitle from title screen (viewed Jan 07, 2009). Includes two published articles co-authored with others. Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Australina Key Centre for Microscopy and Microanalysis, Electron Microscope Unit, Faculty of Science. Includes bibliographical references. Also available in print form.
Ung, Thi phuong lien. "Control disorder for electromagnetic localization in plasmonic devices for nanophotonic application." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV013/document.
Full textMetallic nanostructures allow to confine light at subwavelength scales by the excitation of surface plasmon. They open the way for many applications in imaging, photonic components development and quantum information. This thesis deals with the study of metallic nanostructures, semi-continuous or based on holes gratings with a controlled disorder, and their interaction with colloidal semiconductor nanocrystals that are very photostable. Combining several complementary experimental approaches (far-field spectroscopy, near-field optical microscopy, near-field active probe microscopy, characterization by confocal microscopy of the emission of nanocrystals coupled to the metallic surfaces), we were able to highlight specific characteristics of the plasmon modes of these different structures. For the gratings with a controlled disorder, we have in particular analyzed the emergence of intense localized modes and determined the influence of parameters such as the thickness of the gold layer, the diameter of the holes or the initial periodicity of the grating. The experimental results are in very good agreement with the numerical simulations carried out by FDTD
Lebold, Timo. "Mesoporous silica nanostructures." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-118194.
Full textGrobert, Nicole. "Novel carbon nanostructures." Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326914.
Full textLangdo, Thomas Andrew 1974. "Selective SiGe nanostructures." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8450.
Full textIncludes bibliographical references (p. 206-215).
Selective epitaxial growth (SEG) of SiGe on patterned SiO2/Si substrates by ultra-high vacuum chemical vapor deposition (UHVCVD) shows promise for the fabrication of novel SiGe microelectronic structures. This work explores selective growth conditions in the SiH2Cl2/SiH4/GeH4/H2 system between 650-850⁰C, without the addition of C12 or HC1, on substrates patterned by both conventional and interferometric lithography. We have achieved several important milestones for the fabrication of vertical MOSFETs by selective growth in 100 nm SiO2 features patterned by interferometric lithography. We have observed excellent selectivity to SiO2 masks with SiH2C12 at 750⁰C, perfect epitaxial Si filling of SiO2 features, the facet morphology during growth, and the effects of n-type doping on selective growth. We have also fabricated extremely sharp p-n diode doping profiles. With the above accomplishments we have demonstrated the feasibility of vertical MOSFET fabrication through selective epitaxial growth. To realize the advantages of advanced MOSFET designs on silicon-on-insulator (SOI) substrates, we have developed a facet-free raised source/drain process utilizing moderate n-type doping of Si selective growth and <110>-oriented vertical SiO2 sidewalls. However, to improve SiO2 spacer dimension fidelity and eliminate Si substrate overetching, a novel SiO2/Si3N4 spacer process was developed. The keys to the SiO2/Si3N4 spacer process are removal of the Si3N4 layer prior to growth and increased Si ELO growth by moderate in situ n-type doping. This process has wide ranging application to both SOI and bulk Si technologies for fabrication of low-resistance contacts in advanced devices.
(cont.) By a combination of interferometric lithography Si/SiO2 substrate patterning and Ge selective epitaxial growth, we have demonstrated threading dislocation blocking at the oxide sidewall which shows promise for dislocation filtering and the fabrication of low defect density Ge on Si for III-V device integration. Defects at the Ge film surface only arise at the merging of epitaxial lateral overgrowth (ELO) fronts from neighboring holes. These results confirm that epitaxial necking can be used to reduce threading dislocation density in any lattice-mismatched systems where dislocations are not parallel to growth directions. Investigation of Ge selective growth in micron-sized SiO2 features by plan-view TEM shows that substrate patterning on the order of microns is insufficient to filter dislocations in a large mismatch system ([epsilon] > 2%). Ge p-i-n photodetectors were selectively grown in micron-sized SiO2/Si features to correlate materials properties with electrical characteristics. For chemical protection and compatibility with Si microelectronics, Ge photodetector regions were capped with a thin n+ Si layer. Photodetectors fabricated on unpatterned substrates demonstrated leakage currents comparable to published results on Ge on Si photodetectors while leakage currents were noticeably degraded in devices grown on patterned substrates.
by Thomas Andrew Langdo.
Ph.D.
Werra, Julia Franziska Maria. "Probing plasmonic nanostructures." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17658.
Full textElectric and magnetic emitters can be used to probe different plasmonic nanostructures. By determining the modification of the radiation dynamics and the lifetimes, we can measure the photonic local density of states. This, being a property of the enviroment, does not only allow us to draw conclusions regarding the electronic and other physical properties of the latter but also regarding the general light-matter coupling properties of the plasmonic nanostructure. A strong light-matter coupling is important for future applications in quantum technology. If emitters couple specifically to plasmonic nanostructure, the latter do not only focus the emitted light at the sub-wavelength scale at the surface of the structure but also allow for such a strong light-matter coupling due to the field enhancement at the surface. In this work, we focus on two different basic plasmonic systems: first, we study analytically the influence of graphene on electric and magnetic emitters, and second we discuss lifetime modifications and radiation dynamics close to silver and gold nanostructures. In the first part of this work, we specifically focus on the influence of graphene exhibiting a finite band gap on the emitter. In the second part, we model the propagation of electromagnetic fields in three-dimensional space making use of the discontinuous Galerkin time-domain method with extended functionalities. This framework we apply to model the first three-dimensional scanning-probe fluorescence-lifetime imaging microscopy by use of a single quantum-emitter as well as for a self-consistent description of emitters in the proximity of a gold pentamer. The combination of these studies stress that the strength of emitters lies in the detection of electronic, optical and magnetic properties.
D'Imperio, Luke A. "Biosensing-inspired Nanostructures:." Thesis, Boston College, 2019. http://hdl.handle.net/2345/bc-ir:108627.
Full textNanoscale biosensing devices improve and enable detection mechanisms by taking advantage of properties inherent to nanoscale structures. This thesis primarily describes the development, characterization and application of two such nanoscale structures. Namely, these two biosensing devices discussed herein are (1) an extended-core coaxial nanogap electrode array, the ‘ECC’ and (2) a plasmonic resonance optical filter array, the ‘plasmonic halo’. For the former project, I discuss the materials and processing considerations that were involved in the making of the ECC device, including the nanoscale fabrication, experimental apparatuses, and the chemical and biological materials involved. I summarize the ECC sensitivity that was superior to those of conventional detection methods and proof-of-concept bio-functionalization of the sensing device. For the latter project, I discuss the path of designing a biosensing device based on the plasmonic properties observed in the plasmonic halo, including the plasmonic structures, materials, fabrication, experimental equipment, and the biological materials and protocols
Thesis (PhD) — Boston College, 2019
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics
Chauvin, Nicolas. "Spectroscopie de la boîte quantique unique dans les systèmes InAs sur InP et InAs sur GaAs émettant à 1,3 µm : application aux sources localisées." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0051/these.pdf.
Full textQuantum dots are very promising in the field of quantum information which requires the use of single photons for quantum cryptography or quantum calculation. Thus, it is necessary to understand the physic of single InAs/GaAs and InAs/InP quantul dots emitting in 1. 3 to 1. 5 micrometer spectral range, wavelengths adapted for the transmission through optical fibres. In this thesis, we studied the exciton-biexciton complex, the fine structure splitting, the impact of the temperature and charged excitons in single quantum dots. We observed the dependence of the biexciton binding energy and of the fine structure splitting as a function of the InAs/InP quantum dot size. Moreover, the studies as a function of the temperature showed that the linewidth of the exciton recombination is in the meV range nitrogen temperature and in the 10-15 me V range at room temperature for the InAs/GaAs dots
Bottein, Thomas. "Synergetic combination of top-down and bottom-up lithography processes for large scale nanostructures applied to photonics." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0175/document.
Full textThe scope of this thesis is to adopt a hybrid approach through the synergetic combination of bottom-up and top-down lithography methods to fabricate nanostructures with interesting structural and optical properties. This multidisciplinary approach is a vast fruitful field where many combinations are promising but remains unexplored so far. By taking interest in, and bringing together, both materials chemistry and clean-room nanofabrication techniques, this work tries to find practical solutions to tackle some of the current challenges in nanofabrication. In details, we focus on the study of selected lithography techniques (in particular nanoimprint) and demonstrate the possibility to increase the fabrication throughput and obtain nanostructures on a centimeter scale. The nanofabricated structures are then mainly used as Mie resonators for their optical properties and their ability to modify incoming light. Demonstrators of several millimeters are produced and are shown to exhibit interesting optical properties; emphasizing the feasibility of our approach
Bottein, Thomas. "Synergetic combination of top-down and bottom-up lithography processes for large scale nanostructures applied to photonics." Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0175.
Full textThe scope of this thesis is to adopt a hybrid approach through the synergetic combination of bottom-up and top-down lithography methods to fabricate nanostructures with interesting structural and optical properties. This multidisciplinary approach is a vast fruitful field where many combinations are promising but remains unexplored so far. By taking interest in, and bringing together, both materials chemistry and clean-room nanofabrication techniques, this work tries to find practical solutions to tackle some of the current challenges in nanofabrication. In details, we focus on the study of selected lithography techniques (in particular nanoimprint) and demonstrate the possibility to increase the fabrication throughput and obtain nanostructures on a centimeter scale. The nanofabricated structures are then mainly used as Mie resonators for their optical properties and their ability to modify incoming light. Demonstrators of several millimeters are produced and are shown to exhibit interesting optical properties; emphasizing the feasibility of our approach
France-Lanord, Arthur. "Transport électronique et thermique dans des nanostructures." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS566/document.
Full textThe perpetual shrinking of microelectronic devices makes it crucial to have a proper understanding of transport mechanisms at the nanoscale. While simple effects are now well understood in homogeneous materials, the understanding of nanoscale transport in heterosystems needs to be improved. For instance, the relationship between current, resistance, and heat flux in nanostructures remains to be clarified. In this context, the subject of the thesis is centered around the development and application of advanced numerical methods used to predict electronic and thermal conductivities of nanomaterials. This manuscript is divided into three parts. We begin with the parameterization of a classical interatomic potential, suitable for the description of multicomponent systems, in order to model the structural, vibrational, and thermal transport properties of both silica and silicon. A well-defined, reproducible, and automated optimization procedure is derived. As an example, we evaluate the temperature dependence of the Kapitza resistance between amorphous silica and crystalline silicon, and highlight the importance of an accurate description of the structure of the interface. Then, we have studied thermal transport in graphene supported on amorphous silica, by evaluating the mode-wise decomposition of thermal conductivity. The influence of hydroxylation on heat transport, as well as the significant role played by collective excitations of phonons, have come to light. Finally, electronic transport properties of graphene supported on quasi-two-dimensional silica, a system recently observed experimentally, have been investigated. The influence on transport properties of ripples in the graphene sheet or in the substrate, which often occur in samples and whose amplitude and wavelength can be controlled, has been evaluated. We have also modeled electrostatic gating, and its impact on electronic transport
Wang, Debin. "Thermochemical nanolithography fabrication and atomic force microscopy characterization of functional nanostructures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34776.
Full textSönnichsen, Carsten. "Plasmons in metal nanostructures." [S.l.] : [s.n.], 2001. http://edoc.ub.uni-muenchen.de/archive/00002367.
Full textCazayous, Maximilien. "Interférences Raman et Nanostructures." Phd thesis, Université Paul Sabatier - Toulouse III, 2002. http://tel.archives-ouvertes.fr/tel-00001850.
Full textSönnichsen, Carsten. "Plasmons in metal nanostructures." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-23678.
Full textRørvik, Per Martin. "Synthesis of ferroelectric nanostructures." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-5136.
Full textVan, Hoof Thibaut. "Modèles de nanostructures bimétalliques." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210972.
Full textHodgson, Matthew J. P. "Electrons in model nanostructures." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/15657/.
Full textZhu, Ningjia. "Conductance fluctuations in nanostructures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30431.pdf.
Full textPigeau, Benjamin. "Magnetic vortex dynamics nanostructures." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00779597.
Full textEspeland, Erlend. "Gold Nanostructures on Graphite." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22433.
Full textZhu, Ningjia. "Conductance fluctuations in nanostructures." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34492.
Full textDe, Jesus Tiago. "Admittance fluctuations in nanostructures." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36906.
Full textWe also considered in this thesis the magneto-conductance fluctuations of a quasi-1D quantum wire with artificial impurities (antidots). This problem can only be solved numerically because of the finite size of the artificial impurities. We develop a novel transfer matrix technique to solve the quantum scattering problem by computing the scattering wave function, as a function of the external magnetic field. The Landauer-Buttiker equation is used to compute the magneto-conductance. This work is motivated by the experimental study [1], where several conductance fluctuations anomalies were reported. Our numerical results give good quantitative agreement with the experimental data and confirms the physical picture obtained from the experiment.
Todorov, Tchavdar N. "Quantum transport in nanostructures." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334909.
Full textGiddings, Alexander Devin. "Dilute magnetic semiconductor nanostructures." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10521/.
Full text鄭蔚 and Wei Zheng. "Dynamic conductance of nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243939.
Full textWang, Chaoming. "Thermally annealled plasmonic nanostructures." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5556.
Full textID: 031001538; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Adviser: Ming Su.; Title from PDF title page (viewed August 21, 2013).; Thesis (Ph.D.)--University of Central Florida, 2012.; Includes bibliographical references (p. 95-108).
Ph.D.
Doctorate
Materials Science Engineering
Engineering and Computer Science
Materials Science and Engineering
Eisenbach, Markus. "Magnetic anisotropy in nanostructures." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364862.
Full textLiljestrand, Julia. "Dynamics of magnetic nanostructures." Thesis, Uppsala universitet, Materialfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-297634.
Full textWalton, Stephanie Katharine. "Magnetism in frustrated nanostructures." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25964.
Full textCéreyon, Arnaud. "Amplification Raman et nanostructures." Lyon 1, 2008. http://www.theses.fr/2008LYO10133.
Full textJURE, LIONEL. "Nanostructures sur substrat semiconducteur." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10113.
Full textZheng, Wei. "Dynamic conductance of nanostructures /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B24367382.
Full textCarpenter, Robert. "Exchange bias in nanostructures." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/9080/.
Full textXia, Sijing. "Fabrication of protein nanostructures." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/10126/.
Full textBarr, Joshua. "Transport in Interacting Nanostructures." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/301551.
Full textHagelberg, Frank. "Magnetism in Carbon Nanostructures." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu_books/151.
Full texthttps://dc.etsu.edu/etsu_books/1164/thumbnail.jpg
SPEISER, EUGEN. "Raman spectroscopy on nanostructures." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2008. http://hdl.handle.net/2108/566.
Full textAnand, Aman Roberts James Andrew. "Studying interactions of gas molecules with nanomaterials loaded in a microwave resonant cavity." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-4009.
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