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Cobalt Doped Titanium Dioxide A Possible Candidate For Dilute Magnetic Semiconductor
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Book Synopsis Cobalt Doped Titanium Dioxide, a Possible Candidate for Dilute Magnetic Semiconductor by : Abdul K. Rumaiz
Download or read book Cobalt Doped Titanium Dioxide, a Possible Candidate for Dilute Magnetic Semiconductor written by Abdul K. Rumaiz and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Titanium Dioxide Based Dilute Magnetic Semiconductors by : Bakhtyar Ali
Download or read book Study of Titanium Dioxide Based Dilute Magnetic Semiconductors written by Bakhtyar Ali and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dilute magnetic semiconductors (DMSs) with high Curie temperature are highly desirable in spintronics applications. Transition metal doped oxides such as cobalt (Co), chromium (Cr), copper (Cu) doped TiO 2, ZnO, and SnO 2 are being studied for the last few years. Among other DMSs Co x Ti (1-x) O 2 anatase and rutile has been observed to have high T c (~400K). It is transparent in the visible and near infrared regions with a sizable band gap and appreciable conductivity. Therefore, it is believed to be very useful candidate for the fabrication of magnetic semiconductor devices. It has been shown that the achievement of magnetic percolation effect in DMSs is strongly linked to the nature of dopant and synthesis procedure which eventually leads to defects in the material. In this thesis we report the study of Co doped TiO 2 thin films and Cu:Co codoped TiO 2 nanopowders. Thin films of Co doped TiO 2 on silicon and quartz substrates are synthesized by pulsed laser deposition (PLD). Various oxygen partial pressures (P O2), ranging from 6.6 mPa to 53 Pa, are used to vary the oxygen content in the samples. Crystal structure and transport/ magnetic properties of Co x Ti 1-x O 2 (0.01 = x= 0.06) thin films are found to have a strong dependence on oxygen stoichiometry. X-ray diffraction (XRD) data reveal the presence of mixed phase material containing both anatase and rutile. However, the stability of each phase depends on the P O2 present in the chamber during the growth of the films. X-ray Photoelectron Spectroscopy (XPS) shows that Co is substituted in TiO 2 and is in the 2+ oxidation state. There is an enhancement in electrical conductivity and magnetization resulting from off stoichiometric (deficient) oxygen. The resistivity data fit well with the simple thermal activation model, giving activation energy values of 20 to 140 meV. In the second part we have studied the role of Cu codoping and oxygen vacancies in enhancing/stabilizing room temperature ferromagnetic interactions in Co doped TiO 2 nanopowder (cobalt being 5%, well bellow the cation percolation limit for TiO 2). Analyses of the XRD, TEM and XPS data reveal the cobalt incorporation into the lattice structure with no sign of phase segregations. The as-prepared paramagnetic Co-TiO 2 powder is rendered ferromagnetic by controlling the point defects (oxygen vacancies) in the sample. Interestingly, Cu codoping enhances the magnetization by an order of magnitude in the reduced Co doped TiO 2 . We believe that impurity band exchange mechanism is a plausible model in our Co-TiO 2 sample. The implication of the effect of Cu doping in Co doped sample is also discussed. We have also shown that the enhancement of ferromagnetism with additional doping in Co doped TiO 2 is a reversible effect.
Book Synopsis Materials and Magnetic Studies of Cobalt-doped Anatase Titanium Dioxide and Perovskite Strontium Titanate as Potential Dilute Magnetic Semiconductors by : Tiffany C. Kaspar
Download or read book Materials and Magnetic Studies of Cobalt-doped Anatase Titanium Dioxide and Perovskite Strontium Titanate as Potential Dilute Magnetic Semiconductors written by Tiffany C. Kaspar and published by . This book was released on 2004 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Growth and Ferromagnetic Semiconducting Properties of Titanium Dioxide Thin Films by : Byoung-Seong Jeong
Download or read book Growth and Ferromagnetic Semiconducting Properties of Titanium Dioxide Thin Films written by Byoung-Seong Jeong and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: However, chemical analysis of surface structure indicates that the cobalt segregates into a Co-enriched particles on the surface of films. From SADPs, we confirm that the nanoclusters observed on the surface of the Co0.07Ti0.93O2 are Co-enriched anatase. From the resistivity measurement as a function of magnetic field, the ordinary Hall effect is dominant in the undoped and Co0.02Ti0.98O2-delta thin films. For each film, the magnetoresistance was positive and increase monotonically with increasing magnetic field. The anomalous Hall effect contribution is observed for the Co0.10Ti0.90O2-delta films grown under lower water vapor pressure due to more oxygen deficiency.
Book Synopsis Study of Magneto-transport Properties of Cobalt Doped Indium Oxide Dilute Magnetic Semiconductors by : Abhijit Ghosh
Download or read book Study of Magneto-transport Properties of Cobalt Doped Indium Oxide Dilute Magnetic Semiconductors written by Abhijit Ghosh and published by . This book was released on 2009 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxide based dilute magnetic semiconductors (DMS) are key materials for development of next generation multifunctional spintronics devices such as spin transistors and magnetic random access memories. However, the success of the spintronics devices critically depends on electrical and magneto-transport properties of DMS. This thesis investigates the effect of growth temperature and oxygen pressure on structural, optical, and magneto-transport properties of cobalt-doped indium oxide (In2O3:Co) DMS thin films. Thin films were grown under different partial oxygen pressures and substrate temperatures on quartz and sapphire substrates using pulsed laser deposition (PLD) technique. Structural, electrical, optical, and magneto-transport properties have been measured using various characterization techniques such as x-ray diffractometer (XRD), UV-visible spectroscopy, temperature dependent magneto-transport set-up, and superconducting quantum design magnetometer. The crystallinity of the films increases with increasing growth temperature as well as oxygen pressure during the growth as revealed by XRD. Hall effect and temperature dependence resistivity measurements reveal that the electrical transport properties (carrier density, mobility, and resistivity) in these films can be tuned by changing the growth temperature as well as oxygen pressure. Bandgap, measured using optical measurement, decreases with decrease in carrier concentration obtained from electrical measurement. Magneto-transport properties such as temperature dependent resistivity and magneto-resistance were found to be very sensitive to the micro-structural properties such as crystallinity as well as oxygen defect. These results provide basic information regarding electronic and magnetic properties of indium oxide as a prospective DMS for future spintronics applications.
Book Synopsis The Effect of Nonmagnetic Doping and Growth Temperature on the Magneto-transport Properties of Mangenese [sic] and Cobalt Doped Zinc Oxide Dilute Magnetic Semiconductors by : Govind Mundada
Download or read book The Effect of Nonmagnetic Doping and Growth Temperature on the Magneto-transport Properties of Mangenese [sic] and Cobalt Doped Zinc Oxide Dilute Magnetic Semiconductors written by Govind Mundada and published by . This book was released on 2006 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrothermal Synthesis and Characterization of Cobalt Doped Dilute Magnetic Semiconducting Nanoparticles by : Sirish Chandra Bhamidipati
Download or read book Hydrothermal Synthesis and Characterization of Cobalt Doped Dilute Magnetic Semiconducting Nanoparticles written by Sirish Chandra Bhamidipati and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is great deal of interest in transparent Dilute Magnetic Semiconductors (DMS) due to their potential applications in spintronics. Nanomaterials of transition-metal doped ZnO DMS are considered as ideal systems for carrying out research in the field of spintronics as they can successully combine magnetism and electronics in a single material. In this thesis, ZnO and Co-doped ZnO nanorods have been synthesized by hydrothermal method using aqueous solutions of Zn (NO3)2 .6H2), Co (C2H3OO)2.4H2O, and NH4OH as hydrolytic catalyst. Pure as well as transition element doped ZnO nanomaterials with different sizes and shapes have been synthesized through changing process parameters such as molarity of the precursors, pH of the final mixture, growth and annealing temperature and time during the hydrothermal process. Structural, magnetic, and optical properties are studied using available state-of-the-art techniques such as X-ray diffration (XRD), field emission scanning electron microscopy (FESEM), superconducting quantum interference device (SQUID) magnetometer and ultraviolet-visible spectroscopy. XRD and SEM studies have revealed nanorods with hexagonal Wurtzite structure with length in the range of 200 to 5000 nm, and cross section in the range of 30 to 500 nm. Magnetization data suggest an existence of complex magnetic structure in the (10%, 5%, 2%) Co-doped ZnO nanomaterials. Further investigation is required to better understand the complex nature of magnetic properties in transition metal doped DMS. Understanding of DMS is critical for the future spin-electronics.
Book Synopsis Ferromagnetism in Cobalt-doped Titanium Dioxide by : Alexandre Francois Lussier
Download or read book Ferromagnetism in Cobalt-doped Titanium Dioxide written by Alexandre Francois Lussier and published by . This book was released on 2005 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Functional Magnetic Materials by : Arcady Zhukov
Download or read book Novel Functional Magnetic Materials written by Arcady Zhukov and published by Springer. This book was released on 2016-03-03 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents current research on advanced magnetic materials and multifunctional composites. Recent advances in technology and engineering have resulted from the development of advanced magnetic materials with improved functional magnetic and magneto-transport properties. Certain industrial sectors, such as magnetic sensors, microelectronics, and security, demand cost-effective materials with reduced dimensionality and desirable magnetic properties such as enhanced magnetic softness, giant magnetic field sensitivity, and large magnetocaloric effect. Expert chapters present the most up-to-date information on the fabrication process, processing, tailoring of properties, and applications of different families of modern functional materials for advanced smart applications. Topics covered include novel magnetic materials and applications; amorphous and nanocrystalline magnetic materials and applications; hard magnetic materials; magnetic shape memory alloys; and magnetic oxides. The book's highly interdisciplinary and forward-looking approach will benefit the scientific community, particularly researchers and advanced graduate students working in the field of advanced magnetic materials, composites, and high-performance sensor and microwave devices.
Book Synopsis Proceedings of the ... IEEE Conference on Nanotechnology by :
Download or read book Proceedings of the ... IEEE Conference on Nanotechnology written by and published by . This book was released on 2003 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanostructured Titanium Dioxide in Photocatalysis by : It-Meng Low
Download or read book Nanostructured Titanium Dioxide in Photocatalysis written by It-Meng Low and published by CRC Press. This book was released on 2021-06-18 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) has drawn considerable attention as an attractive inorganic raw material for various applications due to its inexpensiveness, nontoxic nature, stability, and excellent photocatalytic activity. Photocatalysis is one of the most promising route for sustainable chemistry of the 21st century. It can contribute to solving environmental, global energy, and chemical problems, as well as to the sustainable production of commodities in the near future. This book presents the fundamentals of photocatalysis in nanostructured TiO2 and describes the factors affecting the photocatalytic activity, design, and synthesis of various forms of nanostructured TiO2. It highlights the use of ion-doping and inert-atmosphere annealing to extend the light-absorption range of photocatalysts and reduce recombination between electrons and holes. It discusses numerous applications in the fields of energy and environment, such as water purification, gas sensing, storage and delivery, and energy generation. The book is an invaluable resource and useful guide for a broad readership in various fields of catalysis, materials science, environment, and energy.
Book Synopsis Functional Metal Oxides by : Satishchandra Balkrishna Ogale
Download or read book Functional Metal Oxides written by Satishchandra Balkrishna Ogale and published by John Wiley & Sons. This book was released on 2013-11-08 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional oxides are used both as insulators and metallic conductors in key applications across all industrial sectors. This makes them attractive candidates in modern technology ? they make solar cells cheaper, computers more efficient and medical instrumentation more sensitive. Based on recent research, experts in the field describe novel materials, their properties and applications for energy systems, semiconductors, electronics, catalysts and thin films. This monograph is divided into 6 parts which allows the reader to find their topic of interest quickly and efficiently. * Magnetic Oxides * Dopants, Defects and Ferromagnetism in Metal Oxides * Ferroelectrics * Multiferroics * Interfaces and Magnetism * Devices and Applications This book is a valuable asset to materials scientists, solid state chemists, solid state physicists, as well as engineers in the electric and automotive industries.
Book Synopsis Application of Titanium Dioxide by : Magdalena Janus
Download or read book Application of Titanium Dioxide written by Magdalena Janus and published by BoD – Books on Demand. This book was released on 2017-07-26 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide is mainly used as a pigment and photocatalyst. It is possible to find it in food, cosmetics, building materials, electric devices, and others. This book contains chapters about application of titanium dioxide in different branches of economy such as the agriculture, the food industry, the medicine, the cosmetics, the water treatment technologies, and the semiconductors.
Download or read book TiO2 Nanoparticles written by Aiguo Wu and published by John Wiley & Sons. This book was released on 2020-06-02 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique book that summarizes the properties, toxicology, and biomedical applications of TiO2-based nanoparticles Nanotechnology is becoming increasingly important for products used in our daily lives. Nanometer-sized titanium dioxide (TiO2) are widely used in industry for different purposes, such as painting, sunscreen, printing, cosmetics, biomedicine, and so on. This book summarizes the advances of TiO2 based nanobiotechnology and nanomedicine, covering materials properties, toxicological research, and biomedical application, such as antibacter, biosensing, and cancer theranostics. It uniquely integrates the TiO2 applications from physical properties, toxicology to various biomedical applications, and includes black TiO2 based cancer theranostics. Beginning with a comprehensive introduction to the properties and applications of nanoparticles, TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine offers chapters on: Toxicity of TiO2 Nanoparticles; Antibacterial Applications of TiO2 Nanoparticles; Surface Enhanced Raman Spectrum of TiO2 Nanoparticle for Biosensing (TiO2 Nanoparticle Served as SERS Sensing Substrate); TiO2 as Inorganic Photosensitizer for Photodynamic Therapy; Cancer Theranostics of Black TiO2 Nanoparticles; and Neurodegenerative Disease Diagnostics and Therapy of TiO2-Based Nanoparticles. This title: -Blends the physical properties, toxicology of TiO2 nanoparticles to the many biomedical applications -Includes black TiO2 based cancer theranostics in its coverage -Appeals to a broad audience of researchers in academia and industry working on nanomaterials-based biosensing, drug delivery, nanomedicine TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine is an ideal book for medicinal chemists, analytical chemists, biochemists, materials scientists, toxicologists, and those in the pharmaceutical industry.
Book Synopsis Science and Technology of Hybrid Materials by : Cheng-Jun Sun
Download or read book Science and Technology of Hybrid Materials written by Cheng-Jun Sun and published by . This book was released on 2006 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in the welfare of humans tends to be directly related to advances in the science and technology of advanced materials. Hybrid materials make up just one such class of materials, and they are unique in the sense that they exhibit properties that cannot be achieved by using conventional materials design and - at the same time - cannot be predicted by using conventional extrapolations: such as a simple weighted average of the constituents' properties.
Book Synopsis Principles and Applications of ESR Spectroscopy by : Anders Lund
Download or read book Principles and Applications of ESR Spectroscopy written by Anders Lund and published by Springer Science & Business Media. This book was released on 2011-01-04 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles and Applications of ESR Spectroscopy fills the gap between the detailed monographs in ESR spectroscopy and the general textbooks in molecular physics, physical chemistry, biochemistry or spectroscopy. The latter only briefly explain the underlying theory and do not provide details about applications, while the currently available ESR textbooks are primarily focused on the technique as such. This text is based upon the authors’ long experience of teaching the subject to a mixed audience, in the extreme case ranging from physics to biology. The potential of the method is illustrated with applications in fields such as molecular science, catalysis and environmental sciences, polymer and materials sciences, biochemistry and radiation chemistry/physics. Theoretical derivations have in general been omitted, as they have been presented repeatedly in previous works. The necessary theory is instead illustrated by practical examples from the literature.
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