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Modeling and Uncertainty Quantification of Non-contact Scanning Thermal Microscopy

Modeling and Uncertainty Quantification of Non-contact Scanning Thermal Microscopy
Author: Yu Huang (M.S. in Engineering)
Publisher:
Total Pages: 142
Release: 2016
Genre:
ISBN:

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Since its introduction, Scanning Thermal Microscopy (SThM) has been widely used to measure surface temperature and thermal properties of nano-scale materials and structures with high spatial resolution. However, discrepancy exits between the temperature read by the SThM probe and the actual temperature of sample measured. In addition, the temperature of the measured sample can be affected by the presence of the SThM probe. In this thesis work, we used Ansys Fluent to develop a SThM model to establish calibration between the temperature read by the SThM probe and the actual temperature of measurement. The effects of the probe on the temperature of sample is also quantified. We use Bayesian inference to calibrate the unknown thermal conductivities of the polymer (substrate). This model is validated by comparing its predictions with experiment observations. We also quantify the uncertainties in the Quantity of Interest (QoI), the probe tip temperature, due to the uncertainty in the simulation input parameters. This is accomplished by using a generalized polynomial chaos (gPC) formalism. A response surface relating the QoI to model inputs is constructed through stochastic collocation. A Smolyak sparse grid is used to reduce the computation expense. The response surface is sampled based on the PDFs of the input parameters to obtain the PDF of the QoI. We find the uncertainty in the cross-plane thermal conductivity of the liquid polymer and the diameter of the probe tip have large contributions to the overall uncertainty in the QoI.


Coatings and Thin-Film Technologies

Coatings and Thin-Film Technologies
Author: Jaime Andres Perez Taborda
Publisher: BoD – Books on Demand
Total Pages: 288
Release: 2019-01-03
Genre: Technology & Engineering
ISBN: 1789848709

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The field of coatings and thin-film technologies is rapidly advancing to keep up with new uses for semiconductor, optical, tribological, thermoelectric, solar, security, and smart sensing applications, among others. In this sense, thin-film coatings and structures are increasingly sophisticated with more specific properties, new geometries, large areas, the use of heterogeneous materials and flexible and rigid coating substrates to produce thin-film structures with improved performance and properties in response to new challenges that the industry presents. This book aims to provide the reader with a complete overview of the current state of applications and developments in thin-film technology, discussing applications, health and safety in thin films, and presenting reviews and experimental results of recognized experts in the area of coatings and thin-film technologies.


Thermometry at the Nanoscale

Thermometry at the Nanoscale
Author: Luís Dias Carlos
Publisher: Royal Society of Chemistry
Total Pages: 540
Release: 2016
Genre: Science
ISBN: 1849739048

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Covers the fundamentals of measuring temperature at the nanoscale, luminescence-based and non-luminescence based thermometry techniques, and applications.


Author:
Publisher: World Scientific
Total Pages: 332
Release:
Genre:
ISBN:

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Acoustic, Thermal Wave and Optical Characterization of Materials

Acoustic, Thermal Wave and Optical Characterization of Materials
Author: G.M. Crean
Publisher: Elsevier
Total Pages: 413
Release: 2014-08-04
Genre: Technology & Engineering
ISBN: 044459664X

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This volume focuses on a variety of novel non-destructive techniques for the characterization of materials, processes and devices. Emphasis is placed on probe-specimen interactions, in-situ diagnosis, instrumentation developments and future trends. This was the first time a symposium on this topic had been held, making the response particularly gratifying. The high quality of the contributions are a clear indication that non-destructive materials characterization is becoming a dynamic research area in Europe at the present time.A selection of contents: The role of acoustic properties in designs of acoustic and optical fibers (C.K. Jen). Observation of stable crack growth in Al2O3 ceramics using a scanning acoustic microscope (A. Quinten, W. Arnold). Mechanical characterization by acoustic techniques of SIC chemical vapour deposited thin films (J.M. Saurel et al.). Efficient generation of acoustic pressure waves by short laser pulses (S. Fassbender et al.). Use of scanning electron acoustic microscopy for the analysis of III-V compound devices (J.F. Bresse). Waves and vibrations in periodic piezoelectric composite materials (B.A. Auld). Precision ultrasonic velocity measurements for the study of the low temperature acoustic properties in defective materials (A. Vanelstraete, C. Laermans). Thermally induced concentration wave imaging (P. Korpiun et al.). Interferometric measurement of thermal expansion (V. Kurzmann et al.). Quantitative analyses of power loss mechanisms in semiconductor devices by thermal wave calorimetry (B. Büchner et al.). Thermal wave probing of the optical electronic and thermal properties of semiconductors (D. Fournier, A. Boccara). Thermal wave measurements in ion-implanted silicon (G. Queirola et al.). Optical-thermal non-destructive examination of surface coatings (R.E. Imhof et al.). Bonding analysis of layered materials by photothermal radiometry (M. Heuret et al.). Thermal non-linearities of semiconductor-doped glasses in the near-IR region (M. Bertolotti et al.). Theory of picosecond transient reflectance measurement of thermal and eisatic properties of thin metal films (Z. Bozóki et al.). The theory and application of contactless microwave lifetime measurement (T. Otaredian et al.). Ballistic phonon signal for imaging crystal properties (R.P. Huebener et al.). Determination of the elastic constants of a polymeric Langmuir-Blodgett film by Briliouin spectroscopy (F. Nizzoli et al.). Quantum interference effects in the optical second-harmonic response tensor of a metal surface (O. Keller). Study of bulk and surface phonons and plasmons in GaAs/A1As superlattices by far-IR and Raman spectroscopy (T. Dumslow et al.). Far-IR spectroscopy of bulk and surface phonon-polaritons on epitaxial layers of CdTe deposited by plasma MOCVD on GaAs substrates (T. Dumelow et al.). In-situ characterization by reflectance difference spectroscopy of III-V materials and heterojunctions grown by low pressure metal organic chemical vapour deposition (O. Acher et al.). Optical evidence of precipitates in arsenic-implanted silicon (A. Borghesi et al.). Polarized IR reflectivity of CdGeAs2 (L. Artús et al.). Raman and IR spectroscopies: a useful combination to study semiconductor interfaces (D.R.T. Zahn et al.). Silicon implantation of GaAs at low and medium doses: Raman assessment of the dopant activation (S. Zakang et al.). Ellipsometric characterization of thin films and superlattices (J. Bremer et al.). Ellipsometric characterization of multilayer transistor structures (J.A. Woollam et al.). Quality of molecular-beam-epitaxy-grown GaAs on Si(100) studied by ellipsometry (U. Rossow et al.). An ellipsometric and RBS study of TiSi2 formation (J.M.M. de Nijs, A. van Silfhout). A new microscope for semiconductor luminescence studies (P.S. Aplin, J.C. Day). Structural analysis of optical fibre preforms fabricated by the sol-gel process (A.M. Elas et al.). Author index.


Advances in Scanning Thermal Microscopy Measurements for Thin Films

Advances in Scanning Thermal Microscopy Measurements for Thin Films
Author: Liliana Vera
Publisher:
Total Pages: 0
Release: 2019
Genre: Electronic books
ISBN:

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One of the main challenges nowadays concerning nanostructured materials is the understanding of the heat transfer mechanisms, which are of the utmost relevance for many specific applications. There are different methods to characterize thermal conductivity at the nanoscale and in films, but in most cases, metrology, good resolution, fast time acquisition, and sample preparation are the issues. In this chapter, we will discuss one of the most fascinating techniques used for thermal characterization, the scanning thermal microscopy (SThM), which can provide simultaneously topographic and thermal information of the samples under study with nanometer resolution and with virtually no sample preparation needed. This method is based on using a nanothermometer, which can also be used as heater element, integrated into an atomic force microscope (AFM) cantilever. The chapter will start with a historical introduction of the technique, followed by the different kinds of probes and operation modes that can be used. Then, some of the equations and heating models used to extract the thermal conductivity from these measurements will be briefly discussed. Finally, different examples of actual measurements performed on films will be shown. Most of these results deal with thermoelectric thin films, where the thermal conductivity characterization is one of the most important parameters to optimize their performance for real applications.