Download or read book Surface Plasmon Enhanced Photoluminescence of the Rubrene Film by Silver Nanoparticles written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Plasmon Enhanced Coupled and Controlled Fluorescence written by Chris D. Geddes and published by John Wiley & Sons. This book was released on 2017-04-10 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explains the principles and current thinking behind plasmon enhanced Fluorescence Describes the current developments in Surface Plasmon Enhanced, Coupled and Controlled Fluorescence Details methods used to understand solar energy conversion, detect and quantify DNA more quickly and accurately, and enhance the timeliness and accuracy of digital immunoassays Contains contributions by the world’s leading scientists in the area of fluorescence and plasmonics Describes detailed experimental procedures for developing both surfaces and nanoparticles for applications in metal-enhanced fluorescence

Download or read book Embedded Silver Nanoparticles for Metal Enhanced Photoluminescence written by Shahid Iqbal (Ph. D.) and published by . This book was released on 2019 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imaging of biologically significant molecules using plasmons of Metal Nanoparticles (MNPs) is gaining attention in the research community. Localized Surface Plasmon Resonance (LSPR) is the coherent oscillation of conduction electrons of MNPs. The biologically significant molecule is labeled with the fluorophore molecule to get the image. This approach is widely used in clinical practices, however, low intensity light emission from the labeled molecule makes it difficult to image the biologically significant material. One way to improve the weak intensities of fluorophore is to enhance the brightness using a process called Metal Enhanced Photoluminescence (MEP). This phenomenon occurs in the close vicinity of MNPs. Most of the studies in this regard have been carried out using chemically synthesized MNPs of different crystallinity, sizes and shapes. One problem with this approach is the possibility of direct chemical interaction between the fluorophore and MNPs that results in quenching of the Photoluminescence (PL) intensity. In this dissertation we adopted the approach to enhance the PL of different fluorophore molecules/materials by exploiting the LSPR of embedded noble MNPs. Noble MNPs (Au, Ag, Cu) are widely used because the LSPR resonant frequency falls in the visible region of the electromagnetic spectrum that closely overlaps with the excitation frequency of the fluorophore that are used for biological imaging. We tested our approach using Coumarin (C 515) dye and lead halide perovskites, CsPbX3 (X = Cl, Br, and I) and successfully enhanced PL intensity. Moreover, lead halide perovskites have several optoelectronics applications that make them fluorophore of interest. In this dissertation, embedded Silver Nanoparticles (Ag NPs) were synthesized via low energy ion implantation within a few nanometers below the surface of quartz substrates. Ion implantation was carried out with different ion beam fluences and 70 keV ion beam energy. Rutherford Backscattering Spectrometry (RBS) measurements were used to obtain the depth profile and concentration of silver within the quartz substrate. The formation of Ag NPs is characterized by UV/Visible spectroscopy measurements. LSPR peaks of Ag NPs were observed with respect to different fluences that confirmed the formation of embedded Ag NPs. An increase in the size distribution of Ag NPs was observed as the fluence of Ag within the substrate increased. Size increase of Ag NPs was confirmed by the broadening as well as the red-shift of LSPR peaks. Steady-state excitation and emission measurements of C 515, CsPbI3, CsPbBrI2, and CsPbBr3 were carried out to see the effect of embedded Ag NPs on the PL properties of fluorophores. An increase in the PL intensity of C 515, CsPbI3, and CsPbBrI2 was observed with the increase in fluences, giving maxima of 2.1, 3.6, and 5.9 times the PL intensity enhancement. The observed PL enhancement was attributed to a combination of plasmon enhancement with larger Ag NPs and increased plasmonic hot spots. In addition, PL quenching was also observed in case of the CsPbBr3 perovskite nanocomposites with the quenching corresponding to the non-radiative energy transfer from CsPbBr3 perovskite to silver nanoparticles.

Download or read book Advanced Functional Materials written by Yafang Han and published by Trans Tech Publications Ltd. This book was released on 2015-03-20 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of selected, peer reviewed papers from the Chinese Materials Congress 2014 (CMC 2014), July 4-7, 2014, Chengdu, China. The 127 papers are grouped as follows: Symposium E: Materials in Microelectronic and Optoelectronic Industry; Symposium G: Multiferroic Materials; Symposium H: Smart Materials; Symposium I: Vanadium-Titanium And Rare Earth Functional Materials; Symposium J: Biomedical Materials; Symposium K: High Performance And Functional Polymer and Composite Materials

Download or read book Localized Surface Plasmon Resonance Spectroscopy of Gold and Silver Nanoparticles and Plasmon Enhanced Flurescence written by Elizabeth Anne Vokac and published by . This book was released on 2011 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents spectroscopic studies of metallic nanoparticle localized surface plasmons and plasmon enhanced fluorescence. We investigated the dielectric sensitivity of silver nanoprisms to an external electric field and gold nanorods to the formation of a self-assembled surface monolayer. Dark field microscopy was used to image plasmonic scattering from single nanoparticles, and a liquid crystal tunable filter was used to construct corresponding spectra. The plasmon resonances of silver nanoprisms displayed both reversible red shifts and irreversible blue shifts along with drastic intensity changes upon exposure to an applied bias. The plasmon resonances of gold nanorods showed sensitivity to the presence of alkanethiol molecules adhered to the particle surface by a moderate red shift. An increase in the effective external dielectric caused a shift toward longer wavelengths. We imaged plasmon enhanced fluorescence in order to optimize experimental parameters for a developing project that can characterize nanoparticle structure on sub-wavelength dimensions. Preliminary controls were performed to account for the effect of O2 plasma treatment, solvent and alkanethiol monolayer formation on surface plasmon resonances. We found that O2 plasma treatment for different time intervals did not result in a plasmon shift compared to untreated nanoparticles exposed to N2; however when exposed to solvent the surface plasmons of the treated particles shifted five times as far toward the red. Interestingly, the solvent effect only resulted in a plasmon shift when the particles were N2 dried after solvent incubation. Gold nanorods incubated in ethanol showed no wavelength maximum shift in pure solvent over time, but shifted moderately to the red after incubation in a solution of alkanethiol molecules. Conditions for the plasmon enhanced fluorescence study were optimized using a dye conjugate of the same alkanethiol molecule used previously by formation from solution in a monolayer on the gold nanorod surface. The appropriate synthesis for dye functionalization, molecular concentrations, solvents and optical settings were determined.

Download or read book Surface Plasmon Nanophotonics written by Mark L. Brongersma and published by Springer. This book was released on 2007-09-18 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses a new class of photonic devices, known as surface plasmon nanophotonic structures. The book highlights several exciting new discoveries, while providing a clear discussion of the underlying physics, the nanofabrication issues, and the materials considerations involved in designing plasmonic devices with new functionality. Chapters written by the leaders in the field of plasmonics provide a solid background to each topic.

Download or read book Influence of Silver Nanoparticles on Fluorescence Enhancement written by Sai Bharanisrikanth Toleti and published by . This book was released on 2016 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, we studied the influence of silver nanoparticles (AgNP) on the fluorescence properties over glass substrates and on Nano pours oxide film substrates. Enhanced fluorescence intensities were observed due to presence of AgNP in near field to a fluorophore creating hot spots thereby proving the concepts of Metal Enhanced Fluorescence and Surface Plasmon Resonance (SPR). A Bragg reflector pattern is created by varying the refractive index of surface resulting in layered structure causing the light getting trapped in between the layers which exhibited the properties of SPR and Evanescent fields. The mean intensity values were higher for the AgNP introduced glass samples compared to the controls, which provided an evidence of Fluorescence Enhancement. This property may be useful for designing new analytical tools that can be used for single molecule detection in the fields of bio sensing and bio imaging.

Download or read book Plasmon Enhanced Raman and Fluorescence Spectroscopy with Gold and Silver Nanoparticles written by Ariel Rodrigo Guerrero Hernandez and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gap Plasmon Resonances in Metal Film coupled Nanoparticles for Enhanced Photoluminescence and Nonlinear Optical Emission written by Guangcan Li and published by . This book was released on 2017 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Properties of Plasmonic Nanostructures for Bio imaging and Bio sensing Applications written by Vira V. Kravets and published by . This book was released on 2017 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores the physics of free electron excitations in gold nanoparticle chains, silver nanoparticle colloids, and thin gold films. Electron excitations in nanostructures (surface plasmons, SP) are responsible for unique optical properties, which are applied in bio-sensing and bio-imaging applications. For gold nanoparticle chains, the effect of SP on resonance light absorption was studied experimentally and theoretically. Mainly, how the spectral position of the absorption peak depends on inter-particle distances. This dependence is used in “molecular rulers”, providing spatial resolution below the Rayleigh limit. The underlying theory is based on particle interaction via scattered dipole fields. Often in literature only the near-field component of the scattered field is considered. Here, I show that middle and far fields should not be neglected for calculation of extinction by particle chains. In silver nanoparticles, SP excitations produce two independent effects: (a) the intrinsic fluorescence of the particles, and (b) the enhancement of a molecule’s fluorescence by a particle’s surface. The mechanism of (a) is deduced by studying how fluorescence depends on particle size. For (b), I show that fluorescence of a dye molecule on the surface of a nanoparticle is enhanced, when compared to that of the free-standing dye. I demonstrate that the dye’s fluorescent quantum yield is dependent on the particle’s size, making labeled silver nanoparticles attractive candidates as bio - imaging agents. Labeled nanoparticles are applied to cell imaging, and their bio-compatibility with two cell lines is evaluated here. Finally, in gold films under attenuated total internal reflection (ATR) conditions, the SP create a propagating wave (SP-polariton, SPP) when coupled with the incident light. Because of the sensitivity of SPPs to the medium adjacent to the gold film surface, they are widely applied in bio-sensing applications. A toolbox for the description of sputter-deposited gold films is presented here: it employs three experimental techniques (ATR, transmittance and atomic force microscopy) in combination with the effective medium theory for double-layered film model. Our findings have allowed for the avoidance of superficial fitting parameters in our model.

Download or read book Surface Plasmon Resonance Enhanced Photoluminescence and Applications in Organic Electronics written by Shanlin Pan and published by . This book was released on 2006 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Silver Nanoparticle Monolayers for Plasmonics and Surface enhanced Raman Spectroscopy written by Rui Xiu He and published by . This book was released on 2016 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silver nanoparticle monolayers are plasmonic surfaces which primarily find use as a highly sensitive substrate for surface enhanced Raman spectroscopy (SERS), and are also found in thin film solar cells. This thesis describes the development of silver nanoparticle monolayers for the trace detection of the dye molecule rhodamine 6G through the SERS effect, and studies the effect of plasmonic manipulation on SERS sensitivity. Plasmonic manipulation of the monolayer is performed by a pre-fabrication scheme and post-fabrication treatment through particle size tuning and thermal treatment respectively. The changes in the localized surface plasmon resonance (LSPR) are correlated with the observed morphological changes, and the resultant SERS sensitivity is evaluated. It is found that increasing particle size up to 65nm increases the signal intensity, despite the lowering of surface density. This is explained by a rapid increase in the SERS enhancement factor (EF), found using finite element modelling of the LSPR. Thermal treatment is found to decrease signal intensity, but provide the benefit of surface cleaning at 400°C. This leads to some signal recovery, but most importantly opens chemical pathways for surface modification. Both methods are shown to have a predictable effect on the LSPR, allowing for optimization of solar cell applications.

Download or read book Surface Plasmon Enhanced Raman Scattering at Thin Silver Films written by R. M. Corn and published by . This book was released on 1983 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Raman spectra are reported for liquids and Langmuir films enhanced by the electromagnetic fields of plasma surface polaritons at flat silver surfaces. The Kretschmann prism coupling configuration is used to excite the incident surface polariton and to couple out the Raman shifted surface wave. The spectra are interpreted with the help of a simple quantum theory and compared with previously reported grating spectra. Enhancement factors, polarization characteristics, and the feasibility of using surface polaritons to enhance the Raman spectra of adsorbates on flat electrodes in contact with aqueous electrolyte are discussed. (Author).

Download or read book Applications of Nanomaterials written by Sneha Bhagyaraj and published by Woodhead Publishing. This book was released on 2018-06-29 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of Nanomaterials: Advances and Key Technologies discusses the latest advancements in the synthesis of various types of nanomaterials. The book's main objective is to provide a comprehensive review regarding the latest advances in synthesis protocols that includes up-to-date data records on the synthesis of all kinds of inorganic nanostructures using various physical and chemical methods. The synthesis of all important nanomaterials, such as carbon nanostructures, Core-shell Quantum dots, Metal and metal oxide nanostructures, Nanoferrites, polymer nanostructures, nanofibers, and smart nanomaterials are discussed, making this a one-stop reference resource on research accomplishments in this area. Leading researchers from industry, academia, government and private research institutions across the globe have contributed to the book. Academics, researchers, scientists, engineers and students working in the field of polymer nanocomposites will benefit from its solutions for material problems. - Provides an up-to-date data record on the synthesis of all kinds of organic and inorganic nanostructures using various physical and chemical methods - Presents the latest advances in synthesis protocols - Includes the latest techniques used in the physical and chemical characterization of nanomaterials - Covers the characterization of all the important materials groups, such as carbon nanostructures, core-shell quantum dots, metal and metal oxide nanostructures, nanoferrites, polymer nanostructures and nanofibers

Download or read book Halide Perovskites written by Tze-Chien Sum and published by John Wiley & Sons. This book was released on 2019-03-25 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real insight from leading experts in the field into the causes of the unique photovoltaic performance of perovskite solar cells, describing the fundamentals of perovskite materials and device architectures. The authors cover materials research and development, device fabrication and engineering methodologies, as well as current knowledge extending beyond perovskite photovoltaics, such as the novel spin physics and multiferroic properties of this family of materials. Aimed at a better and clearer understanding of the latest developments in the hybrid perovskite field, this is a must-have for material scientists, chemists, physicists and engineers entering or already working in this booming field.

Download or read book Optical Properties of Nanoparticle Systems written by Michael Quinten and published by John Wiley & Sons. This book was released on 2010-11-29 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the gap for a description of the optical properties of small particles with sizes less than 1000 nm and to provide a comprehensive overview on the spectral behavior of nanoparticulate matter, this is the most up-to-date reference on the optical physics of nanoparticle systems. The author, an expert in the field with both academic and industrial experience, concentrates on the linear optical properties, elastic light scattering and absorption of single nanoparticles and on reflectance and transmittance of nanoparticle matter.

Download or read book Metallic Nanostructures written by Yujie Xiong and published by Springer. This book was released on 2014-10-31 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the design for creation of metal nanomaterials with optimal functionality for specific applications. The authors describe how to make desired metal nanomaterials in a wet lab. They include an overview of applications metal nanomaterials can be implemented in and address the fundamentals in the controlled synthesis of metal nanostructures.