Synthesis and Characterization of Doped Core/shell Quantum Dots - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Synthesis and Characterization of Doped Core/shell Quantum Dots write by Elizabeth J. Sodt. This book was released on 2007. Synthesis and Characterization of Doped Core/shell Quantum Dots available in PDF, EPUB and Kindle. The central theme of the research performed is the systematic modification of the optical properties of quantum dots by the formation of a shell of another quantum dot of a different band gap energy. Core/shell quantum dots such as CdS:Mn/CdS. CdS:Mn/ZnS, and ZnS:Mn/CdS with various concentrations of dopant Mn2 in the core and shell concentrations have been synthesized under mild conditions in the aqueous phase using stoichiometric amounts of the surfactant stabilizer dodecyl sulfate. These quantum dots exhibit UV-vis, emission, and electron paramagnetic resonance (EPR) spectral behavior that is dependent on the concentration of the shell and the dopant Mn2 in the core. The emission intensities of the core quantum dots do exhibit a systematic variation with Mn2 concentration. When a shell is added a systematic variation in the emission intensity and lifetime that are inversely proportional to the concentration of the shell is observed. When the large band gap ZnS is added as a shell to the small band gap CdS, the Mn2+ ions migrate from the core to the shell which is manifested in the emission and EPR spectra. Additionally the mixing of the valence and conduction band energy states of the large and small band gap shell and core respectively is also manifested in the emission spectra. In the reverse case, namely when CdS is added as a shell to ZnS the migration is not observed and the mixing of the valence and conduction band energy levels is minimum. The tunable optical properties of these core/shell quantum dots make them excellent platforms for the generation of nanosensors for nerve gas analogs.
Core/Shell Quantum Dots
Core/Shell Quantum Dots - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Core/Shell Quantum Dots write by Xin Tong. This book was released on 2020-07-01. Core/Shell Quantum Dots available in PDF, EPUB and Kindle. This book outlines various synthetic approaches, tuneable physical properties, and device applications of core/shell quantum dots (QDs). Core/shell QDs have exhibited enhanced quantum yield (QY), suppressed photobleaching/blinking, and significantly improved photochemical/physical stability as compared to conventional bare QDs. The core-shell structure also promotes the easy tuning of QDs’ band structure, leading to their employment as attractive building blocks in various optoelectronic devices. The main objective of this book is to create a platform for knowledge sharing and dissemination of the latest advances in novel areas of core/shell QDs and relevant devices, and to provide a comprehensive introduction and directions for further research in this growing area of nanomaterials research.
Synthesis and Characterization of Lead-based Core-shell-shell Quantum Dots and Studies on Excitation-dependent Quantum Yield Measurement
Synthesis and Characterization of Lead-based Core-shell-shell Quantum Dots and Studies on Excitation-dependent Quantum Yield Measurement - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Synthesis and Characterization of Lead-based Core-shell-shell Quantum Dots and Studies on Excitation-dependent Quantum Yield Measurement write by Jieming Cao. This book was released on 2015. Synthesis and Characterization of Lead-based Core-shell-shell Quantum Dots and Studies on Excitation-dependent Quantum Yield Measurement available in PDF, EPUB and Kindle. Nano-sized semiconductors, known as quantum dots (QDs), are one of the hottest research areas in recent years. The energy gaps of QDs change with their diameters, giving them size-dependent optical properties. By controlling reaction conditions, people are able to make QDs that can emit in certain wavelength ranges. So far, QDs have shown great potential in telecommunication, bio-imaging, single-photon laser source, etc. This thesis starts with Chapter 1, which first introduces the finding of QDs and why they have such special properties. The quantum confinement and energy gap are discussed, followed by the absorption and emission of QDs. Moreover, the synthesis methods and mechanism involved are reviewed in brief.
Synthesis and Characterization of Gd-doped InP/ZnS Quantum Dots for Use in Multimodal Imaging Probes
Synthesis and Characterization of Gd-doped InP/ZnS Quantum Dots for Use in Multimodal Imaging Probes - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Synthesis and Characterization of Gd-doped InP/ZnS Quantum Dots for Use in Multimodal Imaging Probes write by Molly Erin Duszynski. This book was released on 2019. Synthesis and Characterization of Gd-doped InP/ZnS Quantum Dots for Use in Multimodal Imaging Probes available in PDF, EPUB and Kindle. Quantum dots (QDs), which are intensely fluorescent nanocrystals ranging 2-10 nanometers in diameter, have shown promise in fluorescence imaging. However, in vivo applications of QDs are limited due to the opaque surrounding of tissue and bones. In this study, InP/ZnS QDs were doped with a paramagnetic atom in an attempt to render them MRI-active. We have further bioconjugated these nanoprobes to develop highly specific MRI-active probes that can be used for detection of neurodegenerative diseases. These bioconjugated nanoprobes detect a mutated form of alpha-synuclein that forms oligomers that are a hallmark of Parkinson’s disease and other alpha-synucleinopathies. Here, we have optimized the doping of QDs with MRI-active metals (e.g. Gadolinium) and characterized the MRI activity. The resulting nanocrystals were further studied to assess the success of the paramagnetic atom’s incorporation into the crystal lattice and its performance as a probe for alpha-synucleinopathies such as Parkinson’s disease.
Ternary Quantum Dots
Ternary Quantum Dots - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Ternary Quantum Dots write by Oluwatobi Samuel Oluwafemi. This book was released on 2021-07-02. Ternary Quantum Dots available in PDF, EPUB and Kindle. Ternary Quantum Dots: Synthesis, Properties, and Applications reviews the latest advances in ternary (I-III-VI) chalcopyrite quantum dots (QDs), along with their synthesis, properties and applications. Sections address the fundamental key concepts of ternary quantum dots, progress in synthesis strategies (i.e., organic and aqueous synthesis), and characterization methods (i.e., transmission electron microscopy, dynamic light scattering, etc.). Properties of ternary quantum dots are comprehensively reviewed, including optical, chemical and physical properties. The factors and mechanisms of the cytotoxicity of ternary quantum dot-based nanomaterials are also described. Since ternary chalcopyrite quantum dots are less toxic and more environmentally benign than conventional binary II-VI chalcogenide quantum dots, they are being investigated to replace conventional quantum dots in a range of applications. Thus, this book reviews QDs in various applications, such as solar cells, photocatalytic, sensors and bio-applications. Reviews fundamental concepts of ternary quantum dots and quantum dot-nanocomposites including the most relevant synthesis strategies, key properties, and characterization techniques Delves into the cytotoxicity of quantum dots looking at the factors and mechanisms that influence cytotoxicity including demonstration of cytotoxicity assays for in vitro and in vivo tests Touches on the many applications of ternary quantum dots including biomedical applications, applications in solar cells, sensing applications, and photocatalytic applications
