Blue-shift of photoluminescence induced by coupling effect of a nanohybrid composed of fluorophore–phenothiazine derivative and gold nanoparticles

2014 ◽  
Vol 16 (3) ◽  
Author(s):  
Lin Kong ◽  
Jia-xiang Yang ◽  
Qi-yu Chen ◽  
Qiong Zhang ◽  
Wen-dong Ke ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Coupling Effect ◽  
Blue Shift ◽  
Phenothiazine Derivative

EXCITON–PLASMON INTERACTION IN MONOLAYERS OF METAL-SEMICONDUCTOR NANOSTRUCTURES

2011 ◽  
Vol 10 (04n05) ◽  
pp. 623-627 ◽  
Author(s):  
M. HARIDAS ◽  
L. N. TRIPATHI ◽  
J. K. BASU
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Near Field ◽  
Blue Shift ◽  
Optical Microscope ◽  
Peak Position ◽  
Photoluminescence Spectra ◽  
Langmuir Blodgett ◽  
Near Field Scanning ◽  
Cdse Nanorods

Effect of shape and density on the energy transfer between metallic nanoparticles and semi conducting nanostructures was studied by observing the photoluminescence spectra using near field scanning optical microscope. The monolayers of gold nanoparticles, CdSe nanorods and composite with different number ratios were prepared using Langmuir Blodgett method. The spectra collected from the films with different number ratios of CdSe and gold shows a systematic variation of peak position and intensity as a function of number density of CdSe . The photoluminescence spectra collected from composite monolayer is blue shifted compared to the spectra from CdSe nanorods monolayer. Further we observed a blue shift in peak position and reduction emission intensity with respect to increase in the fraction of gold nanoparticles and surface density. We have provided explanation for the observed behavior in terms of strong exciton–plasmon interactions in the compact hybrid monolayers.

Opal-Type Photonic Crystals: Fabrication and Application

2010 ◽  
Vol 71 ◽  
pp. 50-57 ◽  
Author(s):  
Andrea Chiappini ◽  
Guillaume Alombert-Goget ◽  
Cristina Armellini ◽  
Simone Berneschi ◽  
Brigitte Boulard ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Crystal ◽  
Photonic Band Gap ◽  
Blue Shift ◽  
Optical Measurements ◽  
Localized Surface Plasmon ◽  
Raman Signal ◽  
Sers Substrate ◽  
Silica Network ◽  
Elastomeric Matrix

We report on fabrication and characterization of two different opal-like structures: (i) crystal exhibiting mechanochromism, i.e. change of colour when subjected to mechanical stress, composed of closely packed colloidal polystyrene particles (CPCP) embedded in a poly-dimethylsiloxane (PDMS) elastomeric matrix; (ii) metallo-dielectric systems (MDCS), based on the realization of inverse silica opal and following attachment of gold nanoparticles on the silica network of the inverse colloidal structure. Optical measurements, performed on the two structures, have demonstrated that: (i) when an horizontal strain is applied on the CPCP embedded in PDMS, a blue shift of the diffraction peak occurs as a function of the applied strain and (ii) MDCS have unique optical properties that combine the localized surface plasmon resonance (LSPR) of gold nanoparticles (Au NPs) with the photonic band gap features of colloidal crystal structures. Finally, preliminary results on MDCS used as SERS substrate evidence a higher increase of the Raman signal in respect to that observed for others metallic structures.

scholarly journals Optical Detection of Denatured Ferritin Protein via Plasmonic Gold Nanoparticles Exposure through Aminosilane Solution

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1417
Author(s):  
Farrell ◽  
Reaume ◽  
Jenrette ◽  
Flowers ◽  
Santiago ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Heat Stress ◽  
Gold Nanoparticle ◽  
Drug Product ◽  
Low Cost ◽  
Blue Shift ◽  
Noble Metal Nanoparticles ◽  
Therapeutic Drug ◽  
Blue Color ◽  
Denatured Proteins

: The presence of denatured proteins within a therapeutic drug product can create a series of serious adverse effects, such as mild irritation, immunogenicity, anaphylaxis, or instant death to a patient. The detection of protein degradation is complicated and expensive due to current methods associated with expensive instrumentation, reagents, and processing time. We have demonstrated here a platform for visual biosensing of denatured proteins that is fast, low cost, sensitive, and user friendly by exploiting the plasmonic properties of noble metal nanoparticles. In this study we have exposed artificially heat stressed ferritin and gold nanoparticles to 3-aminopropyl triethoxysilane, which degrades the protein by showing a systematic blue shift in the absorbance spectra of the gold nanoparticle/ferritin and aminosilane solution. This blue shift in absorbance produces a detectable visual color transition from a blue color to a purple hue. By studying the Raman spectroscopy of the gold nanoparticle/ferritin and aminosilane solution, the extent of ferritin degradation was quantified. The degradation of ferritin was again confirmed using dynamic light scattering and was attributed to the aggregation of the ferritin due to accelerated heat stress. We have successfully demonstrated a proof of concept for visually detecting ferritin from horse spleen that has experienced various levels of degradation, including due to heat stress.

Self-Assembly of Gold Nanoparticle Arrays with Anodic Aluminum Oxide Template

2014 ◽  
Vol 1004-1005 ◽  
pp. 55-58
Author(s):  
Fei Wang ◽  
Hui Xu ◽  
Ying Wei Wang ◽  
Jing Yue Fang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Aluminum Oxide ◽  
Gold Nanoparticle ◽  
Anodic Aluminum Oxide ◽  
Optical Memory ◽  
Blue Shift ◽  
Memory Storage ◽  
Nanoparticle Arrays ◽  
Simple Method ◽  
Anodic Aluminum

Nanoparticles and their ordered arrays have many important applications in fields such as electronic, optical, memory storage devices and sensors. Herein, a simple method was used for fabricating three-dimensional ordered gold nanoparticle arrays with template technique. Gold films were deposited onto anodic aluminum oxide by using electron beam evaporation. After thermal annealing, interestingly, order arrays of gold nanoparticles were obtained by a thermodynamically driven self-assembled process. The spectrum taken by UV-Vis spectrophotometer demonstrates clear surface plasmon resonance at around 500 nm, which appears blue-shift compared with usual gold nanoparticles.

scholarly journals The coupling between two heterogeneous InAs quantum dot families and its effect into optical properties

MRS Advances ◽  
2017 ◽  
Vol 2 (43) ◽  
pp. 2337-2341 ◽  
Author(s):  
Debabrata Das ◽  
Debiprasad Panda ◽  
Harshal Rawool ◽  
Vinayak Chavan ◽  
Subhananda Chakrabarti
Keyword(s):  
Coupling Effect ◽  
Blue Shift ◽  
Ex Situ ◽  
Significant Shift ◽  
Capping Layer ◽  
Annealing Temperatures ◽  
Different Temperatures ◽  
Annealing Study ◽  
Inas Quantum Dot ◽  
Thermal Stability Of

Abstract:In this study, we present the coupling between InAs submonolayer (SML) and stranski krastanov (SK) quantum dots (QDs). Interaction between these two different dot families has been manipulated by changing the capping layer thickness. Significant shift in photoluminescence (PL) peak is observed due to the coupling effect. The dynamics of the carriers in this mixed dot matrix has also been modified, which is evident from the increasing activation energy with increasing thickness of the capping layer. Moreover, an ex situ annealing study at different temperatures has been done to check the thermal stability of the as-grown samples. Annealing at lower temperatures, improves the crystal quality a bit, but higher annealing temperatures accelerate the In-Ga interdiffusion and form smaller dots, which is visible from a blue shift in the PL peak of annealed samples. Also, this thermal process improves the dot size distribution.

scholarly journals High Hydrogen Ion Concentration Causes a Blue Shift in Gold Nanoparticles

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 132
Author(s):  
Po-Yen Lin ◽  
Po-Chen Lin ◽  
Chien-Jung Huang
Keyword(s):  
Gold Nanoparticles ◽  
Cetyltrimethylammonium Bromide ◽  
Blue Shift ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
High Hydrogen ◽  
Measured Absorption ◽  
Chain Polymerization ◽  
Absorption Wavelength

In this research, our team used a rare electrochemical method to obtain gold nanoparticles (GNPs). The growth solution has been added with nitric acid in order to observe the effect of GNPs. The solution also included cetyltrimethylammonium bromide (CTAB) and acetone. All reactions involved the oxidation of acetone and chain polymerization. Therefore, the GNPs changed to a su pramolecular structure. In addition, our team measured absorption wavelength via ultraviolet/ visible spectrophotometer and found an obviously blue shift. This short absorption wavelength is obviously different from other GNPs.

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