scholarly journals From tunable core-shell nanoparticles to plasmonic drawbridges: Active control of nanoparticle optical properties

2015 ◽  
Vol 1 (11) ◽  
pp. e1500988 ◽  
Author(s):  
Chad P. Byers ◽  
Hui Zhang ◽  
Dayne F. Swearer ◽  
Mustafa Yorulmaz ◽  
Benjamin S. Hoener ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Metallic Nanoparticles ◽  
Interparticle Distance ◽  
Plasmon Mode ◽  
Au Nanoparticle ◽  
Shell Nanoparticles ◽  
Strongly Coupled ◽  
Color Changes ◽  
Oxidation Reduction

The optical properties of metallic nanoparticles are highly sensitive to interparticle distance, giving rise to dramatic but frequently irreversible color changes. By electrochemical modification of individual nanoparticles and nanoparticle pairs, we induced equally dramatic, yet reversible, changes in their optical properties. We achieved plasmon tuning by oxidation-reduction chemistry of Ag-AgCl shells on the surfaces of both individual and strongly coupled Au nanoparticle pairs, resulting in extreme but reversible changes in scattering line shape. We demonstrated reversible formation of the charge transfer plasmon mode by switching between capacitive and conductive electronic coupling mechanisms. Dynamic single-particle spectroelectrochemistry also gave an insight into the reaction kinetics and evolution of the charge transfer plasmon mode in an electrochemically tunable structure. Our study represents a highly useful approach to the precise tuning of the morphology of narrow interparticle gaps and will be of value for controlling and activating a range of properties such as extreme plasmon modulation, nanoscopic plasmon switching, and subnanometer tunable gap applications.

Surface roughness and substrate induced symmetry-breaking: influence on the plasmonic properties of aluminum nanostructure arrays

Nanoscale ◽  
2020 ◽  
Author(s):  
Feifei ZHANG ◽  
Jérôme Plain ◽  
Davy Gerard ◽  
Jérôme Martin
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Symmetry Breaking ◽  
Surface Topography ◽  
Metallic Nanoparticles ◽  
Far Field ◽  
Al Nanoparticles ◽  
Nanostructure Arrays

The surface topography is known to play an important role on the near- and far- field optical properties of metallic nanoparticles. In particular, aluminum (Al) nanoparticles are commonly fabricated through...

Effect of gamma radiation on the structural, thermal and optical properties of PMMA/Sn0.75Fe0.25S2 nanocomposite

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali A. Alhazime ◽  
Nesreen T. El-Shamy ◽  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Gamma Irradiation ◽  
Optical Band Gap ◽  
Color Variation ◽  
Nanocomposite Films ◽  
Color Changes ◽  
Gamma Irradiated ◽  
Intermolecular Crosslinking ◽  
Amorphous Part

AbstractNanocomposite films of polymethylmethacrylate PMMA with Sn0.75Fe0.25S2 nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Changes in PMMA/Sn0.75Fe0.25S2 nanocomposite (NCP) due to gamma irradiation have been measured. XRD results indicate that the gamma doses of 10–80 kGy cause intermolecular crosslinking that reduces the ordered portion in the NPs. Bonding between the NPs and the host PMMA was confirmed by FTIR. TGA results indicate an enhancement in thermal stability in the NCP films irradiated with doses 20–80 kGy. The optical band gap was reduced from 3.23 to 2.47 eV upon gamma irradiation up to 80 kGy due bonding between the NPs and PMMA which enhanced the amorphous part of the NPs. Finally, the color variation between the blank and irradiated films (ΔE) was determined. Color changes immensely when the PMMA/Sn0.75Fe0.25S2 NCP films are gamma irradiated. Values of ΔE were as much as 31.6 which is an acceptable match in commercial reproduction on printing presses.

scholarly journals Excitonic effects in the optical spectra of Li2SiO3 compound

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nguyen Thi Han ◽  
Vo Khuong Dien ◽  
Ming-Fa Lin
Keyword(s):  
Optical Properties ◽  
State Of The Art ◽  
Plasmon Mode ◽  
First Principle ◽  
Response Behavior ◽  
Electronic And Optical Properties ◽  
Physical Chemical ◽  
Excitonic Effects ◽  
Energy Loss Functions ◽  
Excitonic Effect

AbstractLi2SiO3 compound exhibits unique electronic and optical properties. The state-of-the-art analyses, which based on first-principle calculations, have successfully confirmed the concise physical/chemical picture and the orbital bonding in Li–O and Si–O bonds. Especially, the unusual optical response behavior includes a large red shift of the onset frequency due to the extremely strong excitonic effect, the polarization of optical properties along three-directions, various optical excitations structures and the most prominent plasmon mode in terms of the dielectric functions, energy loss functions, absorption coefficients and reflectance spectra. The close connections of electronic and optical properties can identify a specific orbital hybridization for each distinct excitation channel. The presented theoretical framework will be fully comprehending the diverse phenomena and widen the potential application of other emerging materials.

scholarly journals Twisted One-Dimensional Charge Transfer and Related Y-Shaped Chromophores with a 4H-Pyranylidene Donor: Synthesis and Optical Properties

2021 ◽  
Vol 86 (4) ◽  
pp. 3152-3163
Author(s):  
Víctor Tejeda-Orusco ◽  
Raquel Andreu ◽  
Jesús Orduna ◽  
Belén Villacampa ◽  
Santiago Franco ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
One Dimensional

scholarly journals Preparation of Noble Metal / Titania-Core / Shell Nanoparticles and their Optical Properties

2014 ◽  
Vol 87 (2) ◽  
pp. 43-49
Author(s):  
Takashi KANDA ◽  
Kanjiro TORIGOE ◽  
Hirobumi SHIBATA ◽  
Masahiko ABE ◽  
Hideki SAKAI
Keyword(s):  
Optical Properties ◽  
Noble Metal ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Impact of Nonequilibrium Between Electrons and Phonons on Heat Transfer in Metallic Nanoparticles Suspended in Dielectric Media

2005 ◽  
Vol 127 (12) ◽  
pp. 1400-1402 ◽  
Author(s):  
Y. Sungtaek Ju
Keyword(s):  
Heat Conduction ◽  
Metallic Nanoparticles ◽  
Energy Transport ◽  
Apparent Size ◽  
Dielectric Medium ◽  
Au Nanoparticle ◽  
Conduction Model ◽  
Metallic Structures ◽  
Atomic Vibrations ◽  
Dielectric Interfaces

Controlled heating of nanoparticles is a key enabling technology for various nanomanufacturing and biomedical applications. A theoretical study of energy transport in nanoparticles is conducted to elucidate the role of electron-phonon spatial nonequilibrium in heat conduction across metal-dielectric interfaces. The continuum two-temperature heat conduction model is shown to capture the apparent size dependence of the thermal interface resistance of Au nanoparticle suspensions. Consideration of coupling between electrons and atomic vibrations is important in understanding energy transport in nanoscale metallic structures suspended in a dielectric medium.

Ag@ZnO core-shell nanoparticles study by first principle: The structural, magnetic and optical properties

2016 ◽  
Vol 244 ◽  
pp. 181-186 ◽  
Author(s):  
Hai-Xia Cheng ◽  
Xiao-Xu Wang ◽  
Yao-Wen Hu ◽  
Hong-Quan Song ◽  
Jin-Rong Huo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Core Shell ◽  
First Principle ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Transient color changes in oxidative-stable fluorinated polyimide film for flexible display substrates

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57339-57345 ◽  
Author(s):  
Yooseong Yang ◽  
Youngsuk Jung ◽  
Myung Dong Cho ◽  
Seung Geol Lee ◽  
Soonchul Kwon
Keyword(s):  
Optical Properties ◽  
Polyimide Film ◽  
Flexible Display ◽  
Color Changes ◽  
Fluorinated Polyimide ◽  
Fluorinated Polyimides ◽  
Thermal Imidization ◽  
Yellow Index

Stable optical properties of high transmittance and low yellow index, which are required for a polyimide film as a flexible display substrate could be affected by thermal imidization even in oxidative-stable fluorinated polyimides.

Sign in / Sign up

Export Citation Format

Share Document