Influence of surface plasmon resonance of Sn nanoparticles and nanosheets on the photoluminescence and Raman spectra of SnS quantum dots

2018 ◽  
Author(s):  
Anita R. Warrier ◽  
R. Gandhimathi
Keyword(s):  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Raman Spectra ◽  
Surface Plasmon ◽  
Plasmon Resonance

Optical and surface plasmon resonance sensing properties for chitosan/carboxyl-functionalized graphene quantum dots thin film

Optik ◽  
2019 ◽  
Vol 178 ◽  
pp. 802-812 ◽  
Author(s):  
Nur Syahira Md Ramdzan ◽  
Yap Wing Fen ◽  
Nur Alia Sheh Omar ◽  
Nur Ain Asyiqin Anas ◽  
Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Graphene Quantum Dots ◽  
Functionalized Graphene ◽  
Sensing Properties

scholarly journals Tuning of Localized Surface Plasmon Resonance in Copper-Copper Oxide Core-Shell Quantum Dots for the Application in Biosensors

2020 ◽  
Author(s):  
Prabhash Prasannan Geetha ◽  
Ajith Ramachandran ◽  
Swapna S. Nair
Keyword(s):  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Copper Oxide ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Particle Diameter ◽  
Noble Metal Nanoparticles ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Chemical Route

Surface Plasmon Resonance (SPR) is an attracting property of certain transition metals when they are synthesized in nano-range giving rise to promising optical applications. However, most SPR and associated applications are limited to the noble metal nanoparticles, which limits their potential due to high production cost. We report surface plasmon resonance in copper-copper oxide core-shell quantum dots synthesized via chemical route studied by using UV-Visible spectrophotometry. Tuning of the plasmonic resonance with respect to the particle diameter is achieved by an inexpensive all chemical route. Photoluminescence measurements also support the data. This size reduction leads to remarkable changes in its optical response as compared to the bulk metal. The results point towards applications of these materials in tunable SPR based biosensors.

scholarly journals Highly sensitive surface plasmon resonance optical detection of ferric ion using CTAB/hydroxylated graphene quantum dots thin film

2020 ◽  
Vol 128 (8) ◽  
pp. 083105
Author(s):  
Nur Ain Asyiqin Anas ◽  
Yap Wing Fen ◽  
Nor Azah Yusof ◽  
Nur Alia Sheh Omar ◽  
Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Optical Detection ◽  
Graphene Quantum Dots ◽  
Ferric Ion ◽  
Highly Sensitive

scholarly journals Quantum dot bioconjugates for the detection of extracellular vesicles in saliva and breath

2021 ◽  
Author(s):  
◽  
Garima Dobhal
Keyword(s):  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Extracellular Vesicles ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Protein Identification ◽  
Colloidal Stability ◽  
Biological Fluids ◽  
Invasive Procedure ◽  
Quantum Yields

<p>Nano-sized extracellular vesicles, released by most types of cells, contain information about the cell they originate from and have been shown to be involved in a variety of cellular processes. However, their detection and characterisation has been challenging and non-standardised, which makes comparisons across literature very challenging. While exosomes are known to exist in complex biological fluids such as saliva, breast milk, blood, and urine, their separation and identification from these media are time-consuming. Many researchers use techniques such as transmission electron microscopy for physical characterisation and western blot for protein identification, which are often not available in medical settings. Additionally, while these fluids can be easily obtained, acquiring similar samples from lung environments is a highly invasive procedure. While breath is known to transmit droplets from the lungs, the presence of exosomes in these condensates is unknown. In this project, functionalised InP/ZnS quantum dots (QDs) were used to target exosomes from a number of biological sources and provide a gateway to more fully characterise their ensemble properties. The InP/ZnS QDs were synthesised, and their size dependency on the band gap was investigated in accordance with the theoretical effective mass approximation model for quantum dots. The QDs were produced with hydrophobic oleylamine ligands, and therefore had to be ligand exchanged to be used in biological applications. A range of ligand exchange methods was surveyed to probe the best balance between retention of original quantum yields and best colloidal stability in aqueous systems.The QDs were further conjugated to an antibody specific for CD63, the protein found on exosomes. The conjugation was confirmed using dynamic light scattering and surface plasmon resonance. Finally, the binding of the QD-Antibody probe to the exosome was confirmed using surface plasmon resonance and confocal microscopy. Further modifications of the assay system could lead to multiplex-detection of the different proteins on the exosomes, their characterisation, and a method for the rapid detection of diseases.</p>

Surface plasmon resonance sensor using polypyrrole-chitosan/graphene quantum dots layer for detection of sugar

2019 ◽  
Vol 6 (7) ◽  
pp. 075028 ◽  
Author(s):  
Amir Reza Sadrolhosseini ◽  
Suraya Abdul Rashid ◽  
Norhanisah Jamaludin ◽  
A S M Noor ◽  
Arun Mohan Isloor
Keyword(s):  
Quantum Dots ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Graphene Quantum Dots ◽  
Surface Plasmon Resonance Sensor ◽  
Resonance Sensor
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