Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 147 for “"Quantum Dots (QDs)"”.
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Luminescent Semiconductor Quantum Dots (QDs) and Their Nanoassemblies as Bioprobes
Quantum dots (QDs) CdS and CdSe were synthesized in three different media including reverse micelles, aqueous solution, and trioctylphosphine oxide/trioctylphosphine (TOPO/TOP). Transmission electron microscope (TEM), X-ray diffraction (XRD), UV-VIS, fluorescence spectroscopy and microscopy were …
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CDSE Quantum Dots and Luminescent/Magnetic Particles for Biological Applications
CdSe semiconductor nanocrystals (quantum dots--QDs) with diameters ranging between 1.5 and 8 nm exhibit strong, tunable luminescence [1-5]. They have been widely investigated for their size-dependent optoelectronic properties [6], and for their potential use in optical devices [7], biological …
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Nanolithographically defined semiconductor quantum dots
In this thesis,nanolithographically de ned quantum dots are discussed including their fabrication process and optical properties. First, an introduction to the eld of quantum dots (QDs), and the advantages of QD-based optoelectronic devices are provided. The research presents our recent work …
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Carbon nanotube assisted formation of sub-50 nm polymeric nano-structures
… for sub-50 nm structures by integrating quantum dots (QDs) on patterned polymer substrates. Poly(styrene-alt-maleic anhydride) (PSMa) was prepared by the initiated chemical vapor deposition (iCVD) method, an alternative to spin-on deposition. The sub-50 nm PSMa polymer patterns were …
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DESIGN, SYNTHESIS, AND CHARACTERIZATION OF NANOCOMPOSITES TO IMPROVE THE PERFORMANCE OF PHOTOVOLTAIC CELLS
… different photoactive materials such as CdSe quantum dots (QDs), perylene-3, 4, 9, 10-tetracarboxylic-3, 4, 9, 10-dianhydride (PTCDA), poly(3-hexylthiophene) (P3HT), multiwalled carbon nanotubes (MWCNTs), multilayer graphene (MuLG), and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM).
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Bio-Inspired Assembly of Nanomaterials for Applications on Nanoelectronics and Biosensors
… such as metallic nanoparticles (NPs), quantum dots (QDs), carbon nanotubes (CNTs), and magnetic nanoparticles has unique physical and chemical properties that can be used for various applications. For practical use of nanomaterials in various applications, however, it is necessary to …
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Development of Nanoprobes for the Biological Imaging Using Positive Charged Quantum Dots and Upconversion Nanoparticles
… unique physicochemical properties due to the quantum confinement effect. Semiconductor quantum dots (QDs) or upconversion nanoparticles (UCNPs) exhibit interesting properties such as high photoluminescence, photostability, dual magnetic/optical modality. In this study, biocompatible and stable …
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Quantum diamonds : a discussion of the chemistry, materials science, physics and applications of ternary (Cu-In-S) nanocrystals
Quantum dots (QDs) are nanometer-sized crystallites of inorganic semiconductors with tunable optoelectronic properties, which has led to a variety of real-world applications beginning in the 1980s, ranging including electronic displays, solar cells, and quantum computers [(Lee, SID), (Tang, Nature …
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Synthesis of CsPbBr3 Quantum Dots for Photodetectors
… properties. we synthesized CsPbBr3 quantum dots (QDs) via the LARP method at RT and mixed them with conjugate polymer to fabricate nanocomposite photodetectors. We found that the size and optical properties of CsPbBr3 QDs are affected by varying the amount of precursor injected into …
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Synthesis of Water Soluble Quantum Dots and their Application for Enzymatic Activity Measurements
Luminescenct Quantum Dots (QDs) intrigue the interest of researchers with their properties of high quantum yield, broad absorption and narrow emission spectra. Since prepared in organic solvents, QDs are not suitable for biological systems. In my study, several methods of "cap exchange" were …
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Development of x-ray luminescence detection system and characterization of x-ray irradiated quantum dots for image-guided x-ray photodynamic therapy
… setup and XL quantification of X-ray irradiated quantum dots (QDs) to study efficiencies of X-ray photodynamic therapy (X-PDT). The XL detection system utilizes a light-sensitive electron-multiplying charge coupled device (EMCCD), a demagnifying (DM) image intensifier, and on optical lens to …
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Eletrossíntese e caracterização de Quantum Dots de CdTe e CdSe
… de novas metodologias de síntese para Quantum Dots (QDs). Portanto, com o objetivo de baratear e diminuir a toxicidade dos QDs formados, devido à presença de agentes redutores presentes nas metodologias de síntese tradicionais, nesse trabalho foi desenvolvida uma metodologia de síntese …
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Synthesis and Characterization of Silica Coated CdSe/CdS Core/Shell Quantum Dots
… semiconductor nanocrysallites, also known as quantum dots (QDs). Because of the strong quantum confinement, quantum dots have unique size-dependent optical properties, which are much more superior to the conventional organic fluorescence materials. In addition, strong chemical resistant makes …
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Opto-Electronic Modulation of Quantum Dots by Cells and Bioactive Molecules
Quantum dots (QDs) have applications and promising myriad applications in photovoltaic cells, biomedical imaging, targeted drug delivery, and quantum information processing. These have led to much research on their interactions with other systems. For biological systems, research has focused on the …
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Surface modifications of iron oxide nanoparticles for biological applications
… nanostructures comprising MPs and semiconductor quantum dots (QDs) are useful tools for biological applications such as for magnetically controlling with fluorescent tracking of particles and for bimodal imaging. Surface modifications of MPs with hydrophobically-modified polyacrylic acid (mPAA) …
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The synthesis of inorganic semiconductor nanocrystalline materials for the purpose of creating hybrid organic/inorganic light-emitting devices
Colloidal semiconductor nanocrystals (NCs) or quantum dots (QDs) can be synthesized to efficiently emit light from the ultraviolet, across the entire visible spectrum, and into the near infrared. This is now possible due to the continual development of new core and core-shell NC structures to meet …
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All inorganic colloidal quantum dot LEDs
This thesis presents the first colloidal quantum dot light emitting devices (QD-LEDs) with metal oxide charge transport layers. Colloidally synthesized quantum dots (QDs) have shown promise as the active material in optoelectronic devices because of their tunable, narrow band emission. To date, the …
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Nanoparticles for Simultaneous Assessment of Ros and Radiosensitization of Brain Cancer Cells for Improved Radiotherapy Outcomes
… density, PEGylated (biocompatible) core-shell quantum dots (QDs) and carbon quantum dots to 1) amplify the local dose; 2) enhance the generation of ROS in vitro 3) assess the amount of ROS Generation and 3) to radiosensitize highly resistant cancer cell lines. The objective and motivation of …
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Modulated Reflectance and Photoluminescence Spectroscopy of Epitaxial InGaAs Quantum Dot Structures /
Self-assembled InAs quantum dots (QDs), whose intersublevel transition energies lie in the mid- and far-infrared spectral range (3–25μm), have attracted particular interest as active elements of infrared photodetectors. This interest is mainly due to intriguing atomic-like quantum confinement and …
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Effect of Quantum Dots, Novel Biological Imaging Agents, in Liver Cells in Vitro
The use of Quantum dots (QDs) coated with polymer and functionalized with carboxylic acid groups in medical applications are explored. Their water solubility and exceptional stability in aqueous environments make them potentially useful for such applications as imaging and ligand attachments. …
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