Дисертації з теми "Raman spectroscopic characterization"
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Yerci, Selcuk. "Spectroscopic Characterization Of Semiconductor Nanocrystals." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608177/index.pdf.
Повний текст джерелаPullen, Aletha Marie. "Spectroscopic characterization of carbon based molecular electronic junctions." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1099671322.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xvii, 208 p.; also includes graphics (some col.). Includes bibliographical references (p. 189-208).
Shad, Farhad Ali. "Spectroscopic Identification and Characterization of Gemstone Minerals." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-450827.
Повний текст джерелаTan, Yan. "Raman spectroscopic study of induced pluripotent stem cells : characterization, identification, and discrimination." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/40716.
Повний текст джерелаRosso, Kevin M. "Detection limits of CO₂in fluid inclusions using microthermometry and Raman spectroscopy and the spectroscopic characterization of CO₂." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/40534.
Повний текст джерелаMaster of Science
Rosso, Kevin Michael. "Detection limits of CO₂ in fluid inclusions using microthermometry and Raman spectroscopy and the spectroscopic characterization of CO₂ /." This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01052009-091123/.
Повний текст джерелаSchäfer, Philipp. "Spectroscopic Characterization of DC Pulsed Sputtered Amorphous Silicon." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-165157.
Повний текст джерелаSanoria, Abhishek [Verfasser], Matthias [Akademischer Betreuer] Rehahn, and Markus [Akademischer Betreuer] Busch. "Developing Raman microscopy as a routine spectroscopic technique for morphology and microstructure characterization of plastics / Abhishek Sanoria ; Matthias Rehahn, Markus Busch." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1122286317/34.
Повний текст джерелаKüpper, Sebastian [Verfasser], та Sebastian [Akademischer Betreuer] Schlücker. "Vibrational spectroscopic characterization of the photochromic molecule α-dinitrobenzylpyridine bypolarization-resolved linear and nonlinear Raman scattering / Sebastian Küpper ; Betreuer: Sebastian Schlücker". Duisburg, 2021. http://d-nb.info/1230322590/34.
Повний текст джерелаAntunez, de Mayolo Eduardo. "Study of the Optical Properties of sp2-Hybridized Boron Nitride." Thesis, Linköpings universitet, Tillämpad optik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125738.
Повний текст джерелаRoig, Blandine. "Caractérisation de tissus cutanés par spectroscopie bimodale : Réflectance Diffuse et Raman." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS031/document.
Повний текст джерелаThis thesis relates to the combination of two in vivo skin characterization techniques. On the one hand, Diffuse Reflectance Spectroscopy (DRS) enables skin optical properties characterization by quantifying light absorption and light elastic scattering. On the other hand, Raman microspectroscopy provides information on molecular compositions of tissues with no need of labeling. Localization and quantification functions of Raman microspectroscopy are both distorted in scattering media such as skin. Therefore, the aim of this thesis was to assess the effect of light-matter interactions on these functions. A bimodal method is proposed to achieve quantitative biochemical characterization of cutaneous tissues in vivo. The main idea is to develop a procedure of Raman spectra correction based on the quantified optical properties provided by DRS. This work was divided in three complementary approaches: the development of a system enabling diffuse reflectance and optical properties measurements in the same zone as Raman microspectroscopy; the fabrication of optical phantoms improving our knowledge on absorption, elastic scattering and Raman scattering phenomena; and the development of a Raman spectra correction model as function of the skin optical properties given by DRS measurements
Brocero, Guillaume. "Comparaison de méthodes de caractérisation thermique de transistors de puissance hyperfréquence de la filière nitrure de gallium." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC222/document.
Повний текст джерелаAt the moment, AlGaN/GaN HEMTs (High Electron Mobility Transistors) are the most promising for high-power hyperfrequency applications, essentially due to their large carrier density and a high electronic mobility. However, the temperature generating during operational conditions is a crucial parameter to measure, in order to estimate the reliability and durability of components. For these reasons, we compared thermoreflectance and Raman spectroscopy, that are non-destructive and possessing a submicronic spatial resolution. These techniques have already proven their feasibility as thermal characterization methods in both continuous wave and pulsed operational modes. We compare here their adaptability and performance to the conception of a thermal test bench. These methods are known for characterizing specific types of material: metals for thermoreflectance and semiconductors for Raman spectroscopy, leading us to the eventuality to combine them. We compared several results measured by thermoreflectance method with equipment from two different manufacturers that commercialize this technology, so we could highlight some aspects and drawbacks that are note relayed in the literature. With Raman spectroscopy, we identified metrology parameters allowing to realize a thermal measurement setup as reproducible as possible, and we also present an innovative method to probe surface material, especially metals
Bagnall, Kevin Robert. "Multiphysics characterization of GaN HEMTs via micro-Raman spectroscopy." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111720.
Повний текст джерелаCataloged from PDF version of thesis. "June 2017."
Includes bibliographical references (pages 215-226).
Microelectronic devices based on solid-state transistor technology are a key innovation that have transformed modern society and affected many aspects of our daily lives. As we continue to increase the density and functionality of transistors, progress is limited by the intrinsic material properties of the most common semiconductor, silicon (Si). Therefore, there is an increasing need for compound semiconductor technologies with more favorable material properties, such as gallium nitride (GaN) high electron mobility transistors (HEMTs), which can operate at significantly higher voltages, current densities, and power densities than Si-based field effect transistors of the same size. However, these more strenuous operating conditions combined with the desire to operate GaN HEMTs in harsher environmental conditions lead to elevated channel temperatures, reduced device performance, and premature device failure. Thus, there is a great need to develop modeling and experimental approaches to characterize the temperature, structural evolution, and electrical performance of GaN HEMTs with microscale and even nanoscale spatial resolution. This thesis explores the application of micro-Raman spectroscopy to experimental characterization of temperature, stress, strain, and electric field in GaN HEMTs with ~1 pim spatial and ~30 ns temporal resolution, respectively. Although micro-Raman spectroscopy has been one of the most common experimental techniques for measuring temperature and stress in GaN HEMTs for the last fifteen years, many of the previous works in the field have been empirical and unable to satisfactorily explain basic features of the Raman response of HEMTs under bias. This thesis demonstrates for the first time the correct electric field dependence of the optical phonon frequencies of wurtzite GaN and measurement of the electric field along the c-axis of the GaN buffer in HEMTs biased in the pinched OFF state. With this holistic understanding of the phonon frequency dependence on temperature, stress, electric field, and strain, a methodology for simultaneously measuring temperature, stress, and electric field using the shift of three Raman peaks has been developed. Theoretical and experimental characterization of the fundamental transient thermal response of GaN HEMTs is also presented using time-resolved micro-Raman thermometry. The novel developments in this thesis represent a new "multiphysics" approach to microscale characterization of semiconductor devices, which we anticipate to have a significant impact in developing a more mechanistic and physics-based approach to transistor reliability rather than relying merely upon the statistics of a population of devices. Such an approach, we believe, will enable new semiconductor devices with unprecedented reliability and performance.
by Kevin Robert Bagnall.
Ph. D.
Boustany, Nada. "Characterization of mucosal dysplasia with ultraviolet resonance Raman spectroscopy." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/9809.
Повний текст джерела"August, 1997."
Includes bibliographical references.
by Nada Boustany.
Ph.D.
Govani, Jayesh R. "Spectroscopic characterizations of organic/inorganic nanocomposites." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
Повний текст джерелаSanii, Laurie Shireen. "Application of Spectroscopy to Protein Characterization." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7641.
Повний текст джерелаQasim, Hasan, and hasanqasim05@gmail com. "Optical spectroscopy characterization of nano-scale photonic structures." RMIT University. Science Engineering and Technology, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080829.162734.
Повний текст джерелаMuttavarapu, Ramya Sudha. "CHARACTERIZATION OF COLD DRAWN POLY L LACTIC ACID BY RAMAN SPECTROSCOPY AND RAMAN HYPERSPECTRAL IMAGING." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1427797659.
Повний текст джерелаMohun, Ritesh. "Raman spectroscopy for the characterization of defective spent nuclear fuels during interim storage in pools." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0288/document.
Повний текст джерелаA specific signature characteristic of irradiation damages in uranium dioxide, the most used nuclear fuel, referred as « triplet defect bands» has recently been evidenced by Raman Spectroscopy. The objective of this study is to determine how this signature can be used to characterize actual spent nuclear fuel stored in pools. For that purpose, three separate effect studies were carried out. Firstly, an electron irradiation experiment shows that the triplet defect bands are due to ballistic interactions and result from the formation displacements in the uranium sub-lattice. Post electron irradiation, the enhanced oxidation of UO2 samples is observed and attributed to the migration of irradiation induced oxygen vacancies towards the surface. The formation kinetics of the triplet defect bands in UO2 when exposed to an inert (Ar) and a reactive (aerated water) contact medium is then investigated through the use of an in-situ Raman installation. Both kinetics can be fitted using a direct impact model, but with different numerical values. Finally, to simulate actual spent nuclear fuels in laboratory conditions, the study of different mixed oxide compounds shows that chemical doping impacts the apparition of the Raman triplet defect bands. The experimental results obtained in this work will be used as complementary data for the interpretation of Raman results of actual defective spent nuclear fuels stored in pool conditions
Wei, Shijun. "Trace Analysis of Crystalline Silica Aerosol Using Vibrational Spectroscopy." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595849455064302.
Повний текст джерелаDreyer, Erin C. "Characterization of electrodeposited chitosan films by atomic force microscopy and raman spectroscopy." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3596.
Повний текст джерелаThesis research directed by: Dept. of Material Science and Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
McGovern, William Robert. "Characterization of carbon-molecule-metal junctions by cyclic voltammetry, raman spectroscopy and X-Ray photoelectron spectroscopy." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1114560996.
Повний текст джерелаIbrahim, Mohamed Asim Yousif. "Co-processing of drugs and co-crystal formers and its effect on pharmaceutical dosage-form performance : co-crystallization of urea/2-methoxybenzamide, caffeine/malonic acid, caffeine/oxalic acid and theophylline/malonic acid systems : solid-state characterization including imaging, thermal, X-ray and Raman spectroscopic techniques with subsequent evaluation of tableting behaviour." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/12760.
Повний текст джерелаIbrahim, Mohamed Asim Y. "Co-processing of drugs and co-crystal formers and its effect on pharmaceutical dosage-form performance. Co-crystallization of urea/ 2-methoxybenzamide, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid systems: Solid-state characterization including imaging, thermal, X-ray and Raman spectroscopic techniques with subsequent evaluation of tableting behaviour." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/12760.
Повний текст джерелаIslamic University of Omdurman and the Ministry of Higher Education in Sudan
Barron, Brent Christian. "Characterization of normal aging and cataractous processes in the eye lens by laser raman spectroscopy." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/30052.
Повний текст джерелаCastan, Alice. "Growth and Characterization of Single-walled Carbon Nanotubes from Chemically Synthesized Catalyst Precursors." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS028/document.
Повний текст джерелаThe work presented in this manuscript is focused on the study of single-walled carbon nanotube (S WCNT) growth by chemical vapor deposition, through the tuning of catalyst nanoparticle composition. The properties of S WCNTs strongly depend on their atomic structure, making structurally selective growth essential for future applications. Here we present a new and original method combining surface chemistry and coordination chemistry, for S CNT growth using a wide range of mono- and bimetallic catalyst systems, formed by the reduction of chemically synthesized catalyst precursors.A thorough study of this process is presented for three metallic precursor systems (Fe, NiFe, NiC), derived from the Prussian blue compound family. An extensive characterization of the precursors, ca -talysts, and the resulting S CNTs has allowed to evidence effects of catalyst composition on growth phenomena.We also show the importance of cross-characterization of SWCNT growth samples, through a comparative study between TEM, and Raman spectroscopy for diameter distribution assessment of our growth samples, and on diameter-sorted SWCNT samples.Preliminary results on the use of cyanosols and polyoxomet alates for SWCNT growth with additional bimetallic catalyst systems (FePd , and CoW) are also presented , highlighting the rich potential of inorganic chemistry and coordination chemistry in the field of SWCNT growth
Wang, Hequn. "Multimodality microscopy and micro-Raman spectroscopy for in vivo skin characterization and diagnosis." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44206.
Повний текст джерелаWieligor, Monika Katarzyna. "Characterization of planar defects in silicon carbide nanowires." [Fort Worth, Tex.] : Texas Christian University, 2010. http://etd.tcu.edu/etdfiles/available/etd-04292010-110338/unrestricted/Wieligor.pdf.
Повний текст джерелаSinjab, Faris. "Integrated AFM-Raman for molecular characterization of peptide nano- and micro-tubes." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/28411/.
Повний текст джерелаBanda, Sumanth. "Characterization of Aligned Carbon Nanotube/Polymer Composites." VCU Scholars Compass, 2004. http://scholarscompass.vcu.edu/etd/1316.
Повний текст джерелаMuralidharan, Ranjani. "Investigation and characterization of Pt-modified Au catalysts and polymer composites by electrochemistry, Raman and surface enhanced Raman spectroscopy (SERS)." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5084.
Повний текст джерелаKranert, Christian. "Investigation of wide-bandgap semiconductors by UV Raman spectroscopy: resonance effects and material characterization." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-160062.
Повний текст джерелаZhou, Yan. "Synthesis, Characterization and Application of SERS-active Metal Nanoparticles." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458644099.
Повний текст джерелаHung, Yi-chen Hung. "Characterization of Nonequilibrium Reacting Molecular Plasmas and Flames using Coherent Anti-Stokes Raman Spectroscopy." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531930166735281.
Повний текст джерелаMalcolm, Kirkland D. "Characterization of the thermal properties of chemical vapor deposition grown diamond films for electronics cooling." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55037.
Повний текст джерелаSheremet, Evgeniya. "Micro- and Nano-Raman Characterization of Organic and Inorganic Materials." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-188175.
Повний текст джерелаBabocsi, Krisztina. "Characterization of II-VI semiconductor nanostructures by low wavenumber raman- and four-wave-mixing spectroscopy." Doctoral thesis, [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975014862.
Повний текст джерелаRivero, Clara A. "Structural characterization of As-S-Se glasses for waveguide applications using near-infrared raman spectroscopy." Honors in the Major Thesis, University of Central Florida, 2001. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/242.
Повний текст джерелаBachelors
Arts and Sciences
Physics
Abbasian, Shojaei Iraj. "Optical Characterization of Single Semiconductor Heterostructure Nanowires and Topological Materials Utilizing Rayleigh and Raman Spectroscopy." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1624914783701404.
Повний текст джерелаEschimese, Damien. "Design, fabrication, and characterization of TIP-enhanced Raman spectroscopy probes based on metallic nano-antennas." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I020/document.
Повний текст джерелаSince the start of the 2000s the evolution of tip-enhanced Raman spectroscopy (TERS) has enabled the simultaneous measurement of localized structural, molecular, and physicochemical properties. TERS technology combines scanning probe microscopy -- atomic force microscopy (AFM) -- with near field optical microscopy. The combined technique is referred to as AFM-TERS. The technique harnesses and exploits the generation of surface plasmons on metal surfaces. These plasmons lead to the generation of confined electromagnetic waves in a sub-wavelength volume at the very tip of the AFM-TERS probe. The main technological challenge today is the design and optimization of an AFM-TERS probe having nanometer-sized dimensions -- and the controlled, reproducible batch fabrication of such structures. The objective of the work presented in this PhD thesis was to design, fabricate, and characterize a new type of AFM probe capable of bettering the current state-of-the-art performances. The PhD was carried out in collaboration with HORIBA and funded partly by a French ‘CIFRE’ grant. In order to meet these objects, comprehensive numerical modelling led to the design of an optimized metal nanostructuring having maximum electromagnetic exaltation -- placed at the extremity of a silicon-based AFM cantilever. A new combined micro and nano fabrication process was developed to achieve this -- to be performed using the existing equipment found in the IEMN cleanroom. The process encompasses techniques such as masking using electron beam (ebeam) lithography and UV photolithography, thermal evaporation of metals and ‘lift-off’ techniques, and highly-controlled dry etching of small silicon mesas structures and deep etching for MEMS cantilever releasing. The process enables the batch-fabrication manufacture of AFM-TERS probes containing matter on the millimeter scale (the silicon probe support), the micrometer scale (the silicon cantilever), and the nanometer scale (the combined metallic disk and cone having sub-wavelength dimensions). This method allows nanostructuring on the optical/plasmonic behavior of TERS probes, the key factor which will lead to higher performance in TERS. Finally, a further study concerning the inclined evaporation of metallic nanostructures via an ebeam-derived lithographic shadow mask was performed in order to control the size and shape of the nanostructuring. The study proved this approach to be feasible. Furthermore, numerical modelling of such structures suggests that they are potential original candidates for both TERS and SERS (surface-enhanced Raman spectroscopy)
Agyepong, Andoh-Baidoo Rosemarie. "SPECTROSCOPIC CHARACTERIZATIONS OF THE COMPOUND II INTERMEDIATE OF SOYBEAN PEROXIDASE FROM SOYBEAN SEED COATINGS." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/20.
Повний текст джерелаBaniasadi, Fazel. "Structure Characterization and Electronic Properties Investigation of Two-Dimensional Materials." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103904.
Повний текст джерелаDoctor of Philosophy
Graphite (consisting of graphene as building blocks) and TMDS in bulk form are layered and with exfoliation one can reach to few layers which is called two-dimension. Two dimensional materials like graphene have been used in researches vastly due to their unique properties, e.g. high carrier mobility, and tunable electronic properties. Transition metal dichalcogenides (TMDs) with a general formula of MX2, where M represents transition metal elements (groups 4-10) and X represents chalcogen elements (S, Se or Te), are another family of two-dimensional materials which have been extensively studied in the past few years. Besides exfoliation, there are also synthesis methods to produce two dimensional materials, e.g. chemical vapor deposition and chemical vapor transport. Normally, after synthesizing these materials, researchers investigate structure and electronic properties of these materials. There might be some atoms which no longer exist in the structure; hence, those are replaced by either vacancies or other elements which all of them are called defects. In chapter 1, defects in graphene and transition metal dichacolgenides were investigated, carefully. Later, dynamic behavior of defects in these materials were investigated and finally, the effect of defects on the electronic properties of the two dimensional materials were investigated. Chapter two talks about a case study which is two dimensional 1T-PtSe2. In this chapter, 5 different kinds of defects were studied using scanning tunneling microscopy and spectroscopy investigations and density functional theory was used to prove our assumptions of the origin of defects. Also, another thing which is investigated by researcher is that how atoms in two dimensional materials vibrate and how the number of layers in the two dimensional material influences vibrations of atoms. Other than this, electronic properties of these materials is dependent upon the number of layers. When these materials are synthesized, there is a stress applied to the material due the mismatch between the material and its substrate, so it is worth investigating the effect of stress (strain) on the structure, and electronic properties of the material of interest. For this purpose, 2M-WS2 was exfoliated on Si/SiO2 substrate and the layer dependency of its vibrational modes was investigated using Raman spectroscopy and density functional theory calculation. Also, in order to investigate the influence of stress (strain) on the electronic properties of two dimensional 2M-WS2, a single monolayer of this materials underwent a series of strains in density functional theory calculations and the effect of strain on the electronic properties of this material was investigated.
Marczak, Marcin. "Alignment and characterization of semiconducting nanowires." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10048/document.
Повний текст джерелаThis work is divided into three sections. The fist part deals with the results of Raman scattering of well-separated silicon nanowires (SiNW) grown by CVD method and deposited on an Au surface. The Raman spectra analysis indicates the presence of two silicon phases: crystalline (cSi) - 520 cm-l and amorphous (aSi) - 470 cm-l, forming core (cSi) - shell (aSi) structure. The Raman spectra have been acquired from three points along cone shaped nanowires: base, centre and tip. Based on the Stokes/anti-Stokes intensity ratios, the position and full width at half maximum of the Raman peaks, temperatures of the Tasi > Tcsi was determined. It suggests that the nanowire cSi core is in a good thermal contact with the metallic substrate, thus improving the heat evacuation of the SiNW core, for which the thermal conductivity is known to be low. Additionally a boron doping of SiNW from Fano-like asymmetry of the peak at 520 cm-l was estimated at 10*19 cm-3. ln the second part a new approach to SiNWs manipulation is presented. At the beginning the travelling wave dielectrophoresis (twDEP) micro liquid pump design and work principle is presented. Our device is used to simultaneously pump a weakly ionic NW suspension and to trap and to rotate NWs. The rotation is out-of-plane with respect to the electrodes. To maximize liquid pumping the cross-over frequency of the RC replacement circuit representing the liquid conductivity and the insulating layer covering the electrodes was determined by impedance spectroscopy. The observed propagation and rotation of nanowires is explained by means of a frequency dependent competition between trapping and drag forces. ln the third part a procedure, based on static DEP, to prepare a suspended nanowire structures is presented. They are used for: (1) nanoelectromechanical systems (e.g.for a biosensor); (2) nanowire field effect transistor coupled to Raman spectrometer (to observe a change in asymmetry of Fanolike 520cm-1 peak in function of the gate voltage)
Greek, Lloyd Shane. "Development and characterization of an optical fiber based instrument for ultraviolet resonance Raman spectroscopy of biomolecules." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0003/NQ27149.pdf.
Повний текст джерелаLi, Ran. "Molecular Characterization of Human Tissue Samples by Raman Spectroscopy with Different Laser Modes and Excitation Wavelengths." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365419543.
Повний текст джерелаStångberg, Valgeborg Fredrik. "Toward a Novel Gas Cell for X-Ray Spectroscopy : Finite Element Flow Simulation and Raman Characterization." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394134.
Повний текст джерелаJonzon, Julia. "Characterization andmodeling of amorphous andcrystalline ratios in poly-acrylates." Thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-40092.
Повний текст джерелаDiehn, Sabrina Maria. "Analysis of data from multimodal chemical characterizations of plant tissues." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/23065.
Повний текст джерелаThe pre-processing and analysis of spectrometric and spectroscopic data of plant tissue are important in a wide variety of research areas, such as plant biology, agricultural science, and climate research. The focus of the thesis is the optimized utilization of data from plant tissues, which includes data from Matrix-Assisted-Laser Desorption/Ionization time of flight mass spectrometry, Raman spectroscopy, and Fourier transform infrared spectroscopy. The ability to attain a classification using these methods is compared, in particular after combination of the data with each other and with additional chemical and biological information. The discussed examples are concerned with the investigation and classification within a particular plant species, such as the distinction of samples from different populations, growth conditions, or tissue substructures. The data were analyzed by exploratory tools such as principal component analysis and hierarchical cluster analysis, as well as by predictive tools that included partial least square-discriminant analysis and machine learning approaches. Specifically, the results show that combination of the methods with additional plant-related information in a consensus principal component analysis leads to a comprehensive characterization of the samples. Different data pre-treatment strategies are discussed to reduce non-relevant spectral information, e.g., from maps of plant tissues or embedded pollen grains. The results in this work indicate the relevance of the targeted utilization of spectrometric and spectroscopic data and could be applied not only to plant-related topics but also to other analytical classification problems.
Kudlacik, Dennis [Verfasser], Jörg [Akademischer Betreuer] Debus, and Heinz [Gutachter] Hövel. "Characterization of semiconductor nanostructures by spin-flip Raman spectroscopy / Dennis Kudlacik ; Gutachter: Heinz Hövel ; Betreuer: Jörg Debus." Dortmund : Universitätsbibliothek Dortmund, 2018. http://d-nb.info/1166950786/34.
Повний текст джерелаMuro, Claire K. "Further Development of Raman Spectroscopy for Body Fluid Investigation| Forensic Identification, Limit of Detection, and Donor Characterization." Thesis, State University of New York at Albany, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10275358.
Повний текст джерелаThe challenges to forensic body fluid analysis have placed limitations on the type of information that investigators can acquire and how that information can be collected. In recent years, Raman spectroscopy has proven itself useful for characterizing body fluids. In 2008, a large-scale investigation was undertaken to explore the use of Raman spectroscopy as a means of identifying body fluids. This work resulted in multidimensional Raman spectroscopic signatures for the five main body fluids: semen, peripheral blood, saliva, vaginal fluid, and sweat. These studies were incredibly successful and created the foundation for years of continued research. Accordingly, the studies included in this thesis have been specifically chosen to frame the previous research projects. They include a suite of projects aimed to advance and validate the developed method.
First, a statistical model was developed to automatically identify and differentiate body fluids based on their Raman spectra. The multidimensional spectroscopic signatures mentioned above are very effective at identification, but they are body fluid-specific. In other words, they individually evaluate whether or not an unknown spectrum is from a particular body fluid, such as blood. Additionally, each signature was built on spectra from a limited number of donors. To improve on this capability, a single classification model was built on the Raman spectra from 60 donors (12 for each body fluid). This model was externally validated with an additional 15 donors in order to objectively assess the model’s performance. All of the external validation donors were correctly identified, illustrating how accurate and robust the model is.
Second, the limit of detection (LOD) for the classification model was explored as a form of validation. It is vitally important that a method’s limits be established before deploying it into use. The LOD of peripheral blood was investigated. Peripheral blood is unique from other body fluids because its Raman spectrum has been attributed almost entirely to one molecule- hemoglobin. Because hemoglobin is only found in red blood cells (RBCs), the Raman spectrum of peripheral blood essentially results purely from RBCs. Given this, we chose to start with a single RBC, and then increase the volume until identification was successful. We found that we were able to conclusively and confidently identify peripheral blood using a single red blood cell. This limit is 5000X smaller than the amount of blood required for DNA analysis, demonstrating the sensitivity of the developed method.
Finally, the method was further advanced by incorporating donor characterization into the process. Besides identifying body fluids, the method can now extract “phenotypic” information about the donor. Raman spectroscopy and multivariate data analysis were used to determine the biological sex of saliva donors, and the race of semen donors. These studies will help forensic investigators extract incredibly useful information about a potential suspect or victim, and can be performed directly at a crime scene for instant results.
Altogether, these studies combine to strengthen the method previously developed by our research group. More importantly, they help to bridge the gap between research and application. Creating a universal method to differentiate and identify body fluids, investigating the method’s LOD, and developing additional techniques to characterize body fluids represents a significant contribution to the field of forensic chemistry. The universal method created within this thesis will be adapted to perform on-site analysis of physical evidence at crime scenes. The methods’ incredible sensitivity has been demonstrated by determining that it can identify peripheral blood based on a single RBC. Finally, by developing models to characterize body fluid donors, investigators will be able to extract useful information about individuals that may have been present at a crime scene. Additional studies are already being conducted to make further improvements, and our method is poised to make a significant contribution to the field of crime scene investigation.