Aspect Ratio Dependence of the Enhanced Fluorescence Intensity of Gold Nanorods:  Experimental and Simulation Study

2005 ◽  
Vol 109 (34) ◽  
pp. 16350-16356 ◽  
Author(s):  
Susie Eustis ◽  
Mostafa El-Sayed
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Fluorescence Intensity ◽  
Simulation Study ◽  
Enhanced Fluorescence ◽  
Ratio Dependence

Aspect-Ratio Dependence on Formation Process of Gold Nanorods Studied by Time-Resolved Distance Distribution Functions

2010 ◽  
Vol 114 (9) ◽  
pp. 3804-3810 ◽  
Author(s):  
Takeshi Morita ◽  
Eiichi Tanaka ◽  
Yukihiro Inagaki ◽  
Hiroyasu Hotta ◽  
Rie Shingai ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Formation Process ◽  
Distribution Functions ◽  
Distance Distribution ◽  
Time Resolved ◽  
Ratio Dependence

Effect of aspect ratio on the chirality of gold nanorods prepared through conventional seed-mediated growth method

2021 ◽  
Vol 1152 ◽  
pp. 338277
Author(s):  
Xiaojuan Zhou ◽  
Qiang Liu ◽  
Xiaoyu Shi ◽  
Chunli Xu ◽  
Baoxin Li
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Growth Method ◽  
Seed Mediated

Synthesis and Luminescence Properties of Tb3+-Doped Hydroxyapatites

2011 ◽  
Vol 399-401 ◽  
pp. 1582-1587
Author(s):  
Su Ping Huang ◽  
Jun Zhu ◽  
Ke Chao Zhou
Keyword(s):  
Aspect Ratio ◽  
Fluorescence Intensity ◽  
Doping Concentration ◽  
Doping Content ◽  
Fluorescent Properties ◽  
Strong Fluorescence ◽  
Active Growth ◽  
Ph Values ◽  
Structure Morphology ◽  
Ultraviolet Ray

In this paper, the terbium -doped nano-HA powders with strong fluorescence was prepared by hydrothermal synthesis and its crystal structure，morphology and fluorescent properties are characterized by XRD, TEM, XPS, ICP and PL spectroscopy. Results showed that with the doping concentration of Tb3+increasing, the aspect ratio of Tb3+-doped HA particles decreased, while the fluorescence intensity excited by ultraviolet ray at 272 nm is significantly enhanced. With pH values increased from 6.5 to 10.0, the aspect ratio of Tb3+-doped HA decreased greatly, and the morphology of nano-Tb:HA particles changes from rod particles to equiaxed particles and the actual doping content and the fluorescence intensity tends to increase correspondingly, which can be explained that under alkaline solution, Tb3+was more easier entering the HA crystal, and the Tb3+would substitute the Ca2+ in both hydroxyapatite Ca(Ⅰ) and Ca(Ⅱ) site, which may block the active growth sites of the seed crystals and resulted in the growth rate and the ratio of length to radius decreasing.

scholarly journals Aspect ratio dependence in magnetorotational instability shearing box simulations

2008 ◽  
Vol 487 (1) ◽  
pp. 1-5 ◽  
Author(s):  
G. Bodo ◽  
A. Mignone ◽  
F. Cattaneo ◽  
P. Rossi ◽  
A. Ferrari
Keyword(s):  
Aspect Ratio ◽  
Magnetorotational Instability ◽  
Ratio Dependence

scholarly journals Aspect-ratio Dependence of Optical Nonlinearities on Resonance with Longitudinal Surface Plasmon in Au Nanorods: Unique Character versus Common Behavior

2018 ◽  
Vol 1 (1) ◽  
pp. 001-007
Author(s):  
Science Nature
Keyword(s):  
Aspect Ratio ◽  
Surface Plasmon ◽  
Nonlinear Behavior ◽  
Dipole Approximation ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Optical Nonlinearities ◽  
Ratio Dependence ◽  
Unique Character ◽  
Metal Metal

Unique character and common behavior are two distinguished things. In frontier nanoscience and nanotechnology, unique characters were normally obtained in some novel exotics materials such as metal-metal core-shell materials, metallic-semiconducting hybrid nanomaterials, and  organic-inorganics complex nano-compounds. On the other hand, normal behavior of natural phenomena including in nano-size objects were obviously predicted based on their exact size related to confinement effect, and capability to interact with another physical system  in nature.  Here, we report an example of unique character due to evolution nonlinear behavior observed in gold nanorod with their aspect-ratio dependence of optical nonlinearities investigated by femtosecond Z-scan measurements closed to resonance longitudinal surface plasmon peak in gold nanorods (Au NRs). Saturable absorption manifests itself at low excitation (laser irradiances < ~7.0 GW/cm2), while reverse saturable absorption dominates at higher excitation. Both the nonlinear processes are found to increase with the aspect ratio of Au NRs.  Based on the discrete dipole approximation, qualitative explanations are presented for the observed nonlinear behavior. While common behavior in metallic quantum dots or other shapes of metallic nanomaterials was not the significant in our observation.  

Peptide Controlled Assembly of Palladium Nanoparticles on High-Aspect-Ratio Gold Nanorods

2020 ◽  
Vol 124 (50) ◽  
pp. 27743-27753
Author(s):  
John Tyler Wagner ◽  
Analeece K. Long ◽  
Michael B. Sumner ◽  
Ivan Cockman ◽  
Marvin Smith ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Palladium Nanoparticles ◽  
Controlled Assembly
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