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 65 for “"Localized surface plasmon"”.
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Localized Surface Plasmon Resonance: Nanoscale Sensing for Processes at Interfaces
This PhD thesis reports the use the emerging surface-sensitive optical technique of localized surface plasmon resonance (LSPR) to characterize the interaction of relevant classes of biomolecules, e.g. peptides, proteins, lipids and DNA strands, at solid-liquid interfaces, with an emphasis on …
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Creation of novel gold-nanorod-based localized surface plasmon resonance biosensors
Starting with a comprehensive review of both surface plasmon resonance (SPR) based and localized surface plasmon resonance (LSPR) based sensors, this thesis reports the studies on the development of a novel sensitive gold nanorod (GNR) based label-free LSPR optical fibre biosensor, and the …
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Manipulation of Light-Matter Interaction in Two-Dimensional Systems via Localized Surface Plasmons
Localized surface plasmons (LSPs), which are collective charge oscillation confined by metallic nanoparticles, gained much interest in the field of optoelectronics due to its ability to confine light down to nanoscale without a diffraction limit. As light-matter interaction in nanoscale is becoming …
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PLASMONIC NANOPARTICLES AS VERSATILE NANORULERS FOR SENSING APPLICATIONS: DEVELOPING THE NANOPARTICLE-ON-MIRROR ARCHITECTURE
The basis of plasmonic sensors is the resonant coupling between the oscillations of free electrons, called plasmons, and incident visible light waves. By confining these oscillations within a nanostructure, the coupling efficiency is enhanced by the creation of localized surface plasmon resonant …
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Synthesis and characterization of nanoparticle suspensions: Towards quantitative surface-enhanced Raman spectroscopic sensing
Surface-enhanced Raman spectroscopy (SERS) is an ultrasensitive technique with applications ranging from in vitro and in vivo biological sensing to chemical and explosives detection. In this thesis, we explore the design and characterization of suspensions of nanoparticles prior to their use for …
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Plasmonic nanostructures and metamaterials for nanoscale light-matter interaction
… phenamena at nanoscale in the presence of plasmonic nanostructures and metamaterials. Using the principles of nano-optics, a range of plasmonic nanodevices are developped for molecular sensing, nonlinear optics and surface plasmon lasing. This theoretical and experimental investigation is …
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M13 bacteriophage-enabled assembly of nanocomposites : synthesis and application in energy conversion devices
… light harvesting efficiency is also improved by localized surface plasmon-enhanced photo-absorption of dye-molecules, with and without adding viruses into the titania photoanodes of dye-sensitized solar cells. In addition, virus-graphene complex is utilized to enhance the performance of …
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Photochromic Molecular Materials for the Controlled Organization of Nanoparticles
… polymeric backbone. These dyes were used to form surface relief grating on the thin films due to the bulk mass transfer. This mass transfer was exploited to align polystyrene nanoparticles in the crests and troughs of the gratings. Secondly, the fabrication of azo nano objects will be discussed, …
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Exploiting plasmons to sense interfacial changes at the nanoscale
… materials development. As a class of materials, plasmonic nanomaterials are a promising approach for probing chemistry at interfaces. When excited with an incident electric field like light, plasmonic nanomaterials exhibit localized surface plasmon resonances (LSPR). The LSPR scattering spectrum …
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Studying DNA-Directed Nanoassembly, Hybridization and Mismatch-Discrimination via Plasmon Scattering of Gold Nanoparticles
This research study combined the exquisite plasmon scattering properties of spherical gold nanoparticles (nAu) and the specific recognition attributes of DNA to investigate the nAu-DNA assembly formation, and to apply the nanoassemblies for DNA detection. The nanoassembly structures, successfully …
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Design and characterization of plasmonic nanoprobes and interparticle interactions for surface enhanced raman scattering and biomolecular detection
… applications is the exploitation of the unique plasmonic properties of certain metal nanoparticles. A key challenge is the understanding of effective harnessing of the plasmonic coupling of the nanoparticles upon interacting with the targeted biomolecular species. This thesis work focuses on …
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Development of nanoplasmonic devices for biosensing applications
… for measuring protein-protein interactions. Plasmonic sensors are appealing for biosensing applications due to the high sensitivity of the generated evanescent fields to local refractive index changes. However, widespread applications of these sensors are limited due to bulky, high-cost …
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Optimizing the Toehold-Mediated Strand Displacement Reaction on the Nanoparticle Surface by Altering the Surface DNA Density for the Design of a microRNA NanoOptical Sensor
… strand-displacement reaction on nanoparticle surfaces. Gold nanoparticles were functionalized with oligonucleotide sequences with varying surface density by incorporating diluent DNA strands. The hybridization of DNA yields aggregates which then disassemble via a strand-displacement reaction …
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Trimetallic gold silver copper nanorods for carbon dioxide reduction
… due to their respective metal nanorods’ tunable plasmonic and catalytic properties especially in photocatalysis. The synthesis was adapted from a popular gold nanorods synthesis procedure where the modification would be replacing gold salts with copper salts. The formation of the rodlike shape …
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Paper-Based Sensors for Contaminant Detection Using Surface Enhanced Raman Spectroscopy
Surface enhanced Raman spectroscopy (SERS) is highly promising analytical technique for trace detection of analytes. It is particularly well suited for environmental analyses due to its high sensitivity, specificity, ease of operation and rapidity. The detection and characterization of …
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Plasmonic Surface Modifications with Hard-Core/Soft-Shell Nanoparticles
… of this thesis is the creation of functional surfaces with hard-core/soft-shell plasmonic colloidal building blocks in respect of optical surface functionalization. With the focus on bottom up surface modification using self-assembly and template assisted self-assembly techniques. The optical …
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Infrared Energy Conversion in Plasmonic Fields at Two-Dimensional Semiconductors
<p>Conversion of infrared energy within plasmonic fields at two-dimensional, semiconductive transition metal dichalcogenides (TMD) through plasmonic hot electron transport and nonlinear frequency mixing has important implications in next-generation optoelectronics. Drude-Lorentz theory and …
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High pressure surface enhanced Raman scattering spectroscopy
Surface-enhanced Raman scattering spectroscopy (SERS) was combined with the diamond anvil cell technique to study molecular monolayers and single molecules under high pressure. Vibrational spectra up to 8 GPa were obtained for self-assembled monolayers (SAMs) of the energetic material simulant …
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Subwavelength nanostructures for optical biosensing and rapid photochemical reactions
… synthesis is of significant interest in plasmonic biosening due to the simple fabrication capability. However, long synthesis time of more than 10 hours and the use of particle stabilization chemical agents hinder economical and rapid synthesis of such metal nanoparticle systems. We …
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Self-assembled Plasmonic Nanostructures for Thin Film Photovoltaics
… thesis is to explore the optical properties of localized surface plasmon resonance sustained by self-assembled metallic nanoparticles (NPs) for the light trapping application in thin lm photovoltaics (PV). Photovoltaics is able provide safe and clean electricity of the future, inparticular, thin …
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