Download or read book Sensitive Luminescent Probes Based on Semiconductor Quantum Dots and Organic Chromophores written by Shuvasree Ray and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorescent labeling of biological materials using small organic dyes is widely employed in the life sciences and have been used in a variety of applications that include diagnostics and imaging. Quantum dots have the potential to overcome problems encountered by organic molecules and have been exploited for applications in biological imaging and in single particle tracking studies. The dithiolane ring can be exploited to attach a diversity of organic compounds to CdSe-ZnS core-shell nanoparticles. The introduction of spectroscopic labels as trans-azobenzene chromophores offers the opportunity to quantify the average number of dithiolane anchoring groups attached to each quantum dot. The transition from monomeric ligands with a single dithiolane anchor to polymeric ligands with multiple dithiolane anchoring groups can be exploited to raise the number of chromophoric labels adsorbed on each quantum dot. Systems showing FRET have been developed on the basis of supramolecular association of BODIPY based dyes or quantum dots as donors and organic chromophores as acceptors. Amino - terminated dyes and quantum dots associate with the chromophores through an ammonium moiety on addition of acid, thereby bringing them closer. Addition of base increases back the fluorescence intensity of the donor completely because of the dissociation. However a similar system with quantum dots as donor, show a very small restoration of fluorescence possibly due to non-specific interaction. In the next project, introduction of spectroscopic labels, in the form of BODIPY dye within the ligands offered the opportunity to quantify the average number of dithiolane anchoring groups attached to each quantum dot. Both fluorescence resonance energy transfer and electron transfer mechanisms are responsible for the quenching of quantum dot fluorescence and unfortunately does not make the system suitable for pH sensing. In the final project, BODIPY-oxazine based fluorophore - photochrome dyad has been assembled by a connecting triazole ring, such that the emission of the former can be modulated by the electronic and structural changes caused by the photoinduced transformations of the later. Further experiments need to be conducted on the fluorophore - photochrome dyads to switch the luminescence of the former with optical inputs.
Download or read book Luminescent Quantum Dots written by Tara L. Prendergast and published by . This book was released on 2002 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Sensors and Biosensors written by Brian R. Eggins and published by John Wiley & Sons. This book was released on 2008-04-30 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the huge developments in sensor technology and electronic sensing devices that have occurred in the last 10 years, this book uses an open learning format to encourage reader understanding of the subject. An invaluable distance learning book Applications orientated providing invaluable aid for anyone wishing to use chemical and biosensors Key features and subjects covered include the following: Sensors based on both electrochemical and photometric transducers Mass-sensitive sensors Thermal-sensitive sensors Performance factors for sensors Examples of applications Detailed case studies of five selected sensors 30 discussion questions with worked examples and 80 self-assessment questions 140 explanatory diagrams An extensive bibliography
Download or read book Quantum Dot Sensors written by John Callan and published by CRC Press. This book was released on 2013-01-24 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Consisting of six chapters, written by experts in their field, this book charts the progress made in the use of quantum dots as the signaling component in optical sensors since their discovery in the early 1980s. In particular, it focuses on CdS-, CdSe-, and CdTe-type QDs due to their emission in the visible region of the electromagnetic spectrum. The book begins by detailing the range of methods currently used for the preparation and passivation of core/core–shell quantum dots and follows with a discussion on their electrochemical properties and potential toxicity. The book culminates by focusing on how electron and energy transfer mechanisms can be utilized to generate a range of quantum dot-based probes. This is the first text of its kind dedicated to quantum dot-based sensors and will appeal to those readers who have an interest in working with these versatile nanoparticles.
Download or read book Women in Lanthanide based Luminescence Research From Basic Research to Applications written by Qianqian Su and published by Frontiers Media SA. This book was released on 2021-05-18 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frontiers in Chemistry Editor s Pick 2022 written by Frontiers in Chemistry Editorial Office and published by Frontiers Media SA. This book was released on 2022-09-06 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: We are pleased to introduce the 2022 Frontiers in Chemistry: Editor’s Pick collection, showcasing articles stimulating interest in the field, carefully selected in collaboration with our Field Chief Editor, Prof. Steven Suib, of University of Connecticut. With this ebook we aim to highlight and disseminate important findings across the domains of chemistry research, capturing the multidisciplinary and inclusive approach our journal takes towards advancing the field of chemistry and supporting new technological breakthroughs that help humanity live healthier lives on a healthy planet. 2021 was a year which saw our highest journal impact factor yet, international community growth, and a record-breaking number of articles to choose from. We wish to elevate the contributions made by authors, encourage readership and innovation through our open-access philosophies, and thank our Editorial Board for their continued hard work and collaboration.
Download or read book Luminescent Semiconductor Quantum Dots QDs and Their Nanoassemblies as Bioprobes written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 used to characterize the QDs and their nanoassemblies. CdS QDs synthesized in reverse micelles showed broad emission spectra. CdSe-CdS QDs with core shell structure synthesized in aqueous solution showed more than 30% emission quantum yield. CdSe-CdS QDs of different emission colors were prepared. CdSe and CdSe-ZnS QDs were also synthesized in TOPO/TOP media. This synthesis route produced highly luminescent CdSe QDs with over 50% emission quantum yield. The application of QDs as ions probes and methods to encapsulate QDs in nanospheres including micelles, glyconanospheres and silica nanospheres and the use of these nanospheres in bioassays are described. CdS QDs capped with different ligands such as thioglycerol, cysteine and polyphosphate showed different responses to biological relevant ions. The emission intensity of polyphosphate capped CdS QDs was affected by all the tested ions and did not show a selective response. On the other hand, the emission of thioglycerol capped CdS QDs was selectively quenched by copper ions while the emission of cysteine capped CdS QDs was selectively enhanced by zinc ions. Stern-Volmer equation was applied to correlate the emission intensity of the CdS QDs and the copper ion concentration. A Lagmuir isotherm binding equation was used to describe the relation between the emission intensity of cysteine capped CdS QDs and zinc ion concentration. The possible mechanism to explain the effects of capping ligands on CdS QDs responses to ions is also discussed. CdSe QDs synthesized in TOPO/TOP media were encapsulated in nanospheres for bioassay applications. The glyconanospheres contained a large number of glucose residues on their surface and showed high binding activity towards the lectinic protein Concanavalin A (Con A). Silica nanospheres containing hundreds of CdSe QDs were functionalized with thiol groups to enable the conjugation of streptavidin to the nanospheres. The streptavidin modified silica nanospheres were used as luminescent indicators in a sandwich immunoassay for the detection of antiprotein A antibody. The advantages and disadvantages of the nanospheres based bioassay are discussed.
Download or read book Photoactive Semiconductor Nanocrystal Quantum Dots written by Alberto Credi and published by Springer. This book was released on 2017-01-20 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.
Download or read book Metal Ligand Chromophores for Bioassays written by Kenneth Kam-Wing Lo and published by Springer Nature. This book was released on 2022-12-10 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience.Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field. Chapters “Metal Peptide Conjugates in Cell and Tissue Imaging and Biosensing”, “Luminescent Metal Complexes as Emerging Tools for Lipid Imaging” and “Determination and Imaging of Small Biomolecules and Ions Using Ruthenium(II) Complex‐Based Chemosensors” are available open access under a CC BY 4.0 License via link.springer.com.
Download or read book Use of Luminescent CdSe ZnS Nanocrystal Bioconjugates in Quantum Dot Based Nanosensors written by and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomolecules labeled with luminescent colloidal semiconductor quantum dots (QDs) have potential for use in numerous applications, including fluoro-immunoassays and biological imaging. QD labels exhibit size-tunable narrow-band luminescent emission and high resistance to photodegradation. They also exhibit efficient Fo rster energy transfer between neighboring QDs of different sizes and their emission is readily quenched by bound fluorescent dyes. In this paper, we describe preliminary results aimed at defining conditions for the design and preparation of nanoscale QD-bioconjugate sensors based on fluorescence quenching. We envision building sensor assemblies that employ quantum dots linked with dye-labeled biological receptors that utilize donor acceptor energy transfer between QDs and receptors for conducting recognition-based assays. In particular, we report the effects of varying the concentration of energy acceptors bound to nanocrystal surfaces under both soluble and solid phase conditions on quenching phenomena.
Download or read book Cadmium Telluride Quantum Dots written by John Donegan and published by CRC Press. This book was released on 2013-12-03 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades, semiconductor quantum dots—small colloidal nanoparticles—have garnered a great deal of scientific interest because of their unique properties. Among nanomaterials, CdTe holds special technological importance as the only known II–VI material that can form conventional p–n junctions. This makes CdTe very important for the development of novel optoelectronic devices such as light-emitting diodes, solar cells, and lasers. Moreover, the demand for water-compatible light emitters and the most common biological buffers give CdTe quantum dots fields a veritable edge in biolabeling and bioimaging. Cadmium Telluride Quantum Dots: Advances and Applications focuses on CdTe quantum dots and addresses their synthesis, assembly, optical properties, and applications in biology and medicine. It makes for a very informative reading for anyone involved in nanotechnology and will also benefit those scientists who are looking for a comprehensive account on the current state of quantum dot–related research.
Download or read book Rare Earth Metal Organic Framework Hybrid Materials for Luminescence Responsive Chemical Sensors written by Bing Yan and published by Woodhead Publishing. This book was released on 2022-06-01 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare Earth Metal-Organic Framework Hybrid Materials for Luminescence Responsive Chemical Sensors primarily focuses on rare earth functionalized metal-organic framework (MOF) hybrid materials for sensing applications. Sections cover an introduction to the field and key concepts like luminescence, rare earth ion luminescence and luminescence response for chemical sensing. Other section emphasize the luminescence response mode and sensing mechanisms of these important materials, including single mode and dual mode sensing, as well as chemical sensing mechanisms. Final sections outline different kinds of sensing analytes by rare earth functionalized MOFs hybrids and delve into emerging application. This book is suitable for materials scientists and engineers, materials chemists, chemists and chemical engineers. In addition, the material is appropriate for those working in academia and R&D in industry. Authored by one of the world’s leading experts on rare earth metal-organic framework hybrid materials Introduces advanced concepts in luminescence and sensing mechanisms of metal-organic framework hybrid materials Discusses the use of luminescence responsive chemical sensors (based on metal organic frameworks) for logic gate or imaging applications
Download or read book Semiconductor Quantum Dots for Ultrasensitive Biological Detection and Imaging written by Warren W. C. Chan and published by . This book was released on 2001 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Organic Framework Materials written by Leonard R. MacGillivray and published by John Wiley & Sons. This book was released on 2014-09-19 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-Organic Frameworks (MOFs) are crystalline compounds consisting of rigid organic molecules held together and organized by metal ions or clusters. Special interests in these materials arise from the fact that many are highly porous and can be used for storage of small molecules, for example H2 or CO2. Consequently, the materials are ideal candidates for a wide range of applications including gas storage, separation technologies and catalysis. Potential applications include the storage of hydrogen for fuel-cell cars, and the removal and storage of carbon dioxide in sustainable technical processes. MOFs offer the inorganic chemist and materials scientist a wide range of new synthetic possibilities and open the doors to new and exciting basic research. Metal-Organic Frameworks Materials provides a solid basis for the understanding of MOFs and insights into new inorganic materials structures and properties. The volume also reflects progress that has been made in recent years, presenting a wide range of new applications including state-of-the art developments in the promising technology for alternative fuels. The comprehensive volume investigates structures, symmetry, supramolecular chemistry, surface engineering, recognition, properties, and reactions. The content from this book will be added online to the Encyclopedia of Inorganic and Bioinorganic Chemistry: http://www.wileyonlinelibrary.com/ref/eibc
Download or read book Quantum Dots written by Ameenah Al-Ahmadi and published by IntechOpen. This book was released on 2012-04-04 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book “Quantum dots: A variety of a new applications” provides some collections of practical applications of quantum dots. This book is divided into four sections. In section 1 a review of the thermo-optical characterization of CdSe/ZnS core-shell nanocrystal solutions was performed. The Thermal Lens (TL) technique was used, and the thermal self-phase Modulation (TSPM) technique was adopted as the simplest alternative method. Section 2 includes five chapters where novel optical and lasing application are discussed. In section 3 four examples of quantum dot system for different applications in electronics are given. Section 4 provides three examples of using quantum dot system for biological applications. This is a collaborative book sharing and providing fundamental research such as the one conducted in Physics, Chemistry, Biology, Material Science, Medicine with a base text that could serve as a reference in research by presenting up-to-date research work on the field of quantum dot systems.
Download or read book Bioinorganic Photochemistry written by Grazyna Stochel and published by John Wiley & Sons. This book was released on 2009-06-10 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioinorganic photochemistry is a rapidly evolving field integrating inorganic photochemistry with biological, medical and environmental sciences. The interactions of light with inorganic species in natural systems, and the applications in artificial systems of medical or environmental importance, form the basis of this challenging inter-disciplinary research area. Bioinorganic Photochemistry provides a comprehensive overview of the concepts and reactions fundamental to the field, illustrating important applications in biological, medical and environmental sciences. Topics covered include: Cosmic and environmental photochemistry Photochemistry of biologically relevant nanoassemblies Molecular aspects of photosynthesis Photoinduced electron transfer in biosystems Modern therapeutic strategies in photomedicine The book concludes with an outlook for the future of environmental protection, discussing emerging techniques in the field of pollution abatement, and the potential for bioinorganic photochemistry as a pathway to developing cheap, environmentally friendly sources of energy. Written as an authoritative guide for researchers involved in the development of bioinorganic photochemical processes, Bioinorganic Photochemistry is also accessible to scientists new to the field, and will be a key reference source for advanced courses in inorganic, and bioinorganic chemistry.
Download or read book Optical Sensing with CdSe Quantum Dots in Condensed Phase Media written by Melissa Fisher and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The next generation of sensors built upon nanotechnology is rapidly coming to the forefront of scientific applications, with particular application to contemporary global concerns including counterterrorism and device miniaturization. The challenge of incorporating these materials as a stable sensor package is discussed, with special emphasis on condensed phase media, particularly sol-gels, porous glasses and organic solutions. Specifically, incredibly stable, strongly emitting CdSe quantum dots have been incorporated into several glasses and plastics, and are able to detect the presence of organic moieties, the most notorious of which is TNT, through photoluminescence quenching. The mechanism by which this operates is a through-space, long-range resonant transfer of electronic excitation energy, which is further enhanced by a strong binding affinity of the various analytes to the quantum dot surface. New sensor technology based upon quantum-confined, optically-active semiconductor nanomaterials represents an important step in realizing small-scale, highly sensitive and smart sensors.
