Luminescence quantum yields of gold nanoparticles varying with excitation wavelengths

Nanoscale ◽  
2016 ◽  
Vol 8 (4) ◽  
pp. 2188-2194 ◽  
Author(s):  
Yuqing Cheng ◽  
Guowei Lu ◽  
Yingbo He ◽  
Hongming Shen ◽  
Jingyi Zhao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Quantum Yields ◽  
Excitation Wavelength

The photoluminescence quantum yields of gold nanoparticles, nanorods and nanobipyramids are excitation wavelength dependent.

Luminescence quantum yields of gold nanoparticles varying with excitation wavelength

2017 ◽  
Author(s):  
Yuqing Cheng ◽  
Yingbo He ◽  
Jingyi Zhao ◽  
Hongming Shen ◽  
Keyu Xia ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Quantum Yields ◽  
Excitation Wavelength

Quantum Dot/Plasmonic Nanoparticle Metachromophores with Quantum Yields That Vary with Excitation Wavelength

Nano Letters ◽  
2011 ◽  
Vol 11 (7) ◽  
pp. 2725-2730 ◽  
Author(s):  
Keiko Munechika ◽  
Yeechi Chen ◽  
Andreas F. Tillack ◽  
Abhishek P. Kulkarni ◽  
Ilan Jen-La Plante ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Plasmonic Nanoparticle

scholarly journals Optimization of Nonspherical Gold Nanoparticles for Photothermal Therapy

2019 ◽  
Vol 9 (20) ◽  
pp. 4300
Author(s):  
Paerhatijiang Tuersun ◽  
Xiayiding Yakupu ◽  
Xiang’e Han ◽  
Yingzeng Yin
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Photothermal Therapy ◽  
Therapeutic Agents ◽  
Tissue Type ◽  
Excitation Wavelength ◽  
Objective Functions ◽  
Design Tolerance ◽  
T Matrix ◽  
Selection Of

Previous investigations devoted to the optimization of nonspherical gold nanoparticles for photothermal therapy (PTT) encountered two issues, namely, the appropriate selection of objective functions and the processing of particle random orientations. In this study, these issues were resolved, and accurate optimization results were obtained for the three typical nonspherical gold nanoparticles (nanospheroid, nanocylinder, and nanorod) by using the T-matrix method. The dependence of the optimization results on the excitation wavelength and the refractive index of tissue was investigated. Regardless of the excitation wavelength and tissue type, gold nanospheroids were found to be the most effective therapeutic agents for PTT. The light absorption ability of optimized nanoparticles could be enhanced by using a laser with a longer wavelength. Finally, the design tolerance for the different sizes of nanoparticles was provided.

Spatial evolution of the near-field distribution on planar gold nanoparticles with the excitation wavelength across dipole and quadrupole modes

2017 ◽  
Vol 5 (3) ◽  
pp. 187 ◽  
Author(s):  
Jinghuan Yang ◽  
Quan Sun ◽  
Han Yu ◽  
Kosei Ueno ◽  
Hiroaki Misawa ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Field Distribution ◽  
Near Field ◽  
Excitation Wavelength ◽  
Spatial Evolution

A Novel Near-Infrared Fluorescence Sensor for H2O2 Based on N-Acetyl-L-Cysteine-Capped Gold Nanoparticles

2017 ◽  
Vol 46 ◽  
pp. 234-240
Author(s):  
Wen Juan Dong ◽  
Ji Yan Han ◽  
Xin Wu ◽  
Li Fan ◽  
Wen Ting Liang
Keyword(s):  
Hydrogen Peroxide ◽  
Gold Nanoparticles ◽  
Fluorescence Quenching ◽  
Near Infrared ◽  
Fluorescence Probe ◽  
Fluorescence Emission ◽  
Excitation Wavelength ◽  
Experimental Conditions ◽  
Time Resolved ◽  
Near Infrared Fluorescence

A novel near-infrared fluorescence quenching method has been developed for the determination of hydrogen peroxide based on N-acetyl-L-cysteine-capped gold nanoparticles (NAC-AuNPs) as a fluorescence probe. The prepared gold nanoparticles with the size of about 1.91 nm exhibited strong near-infrared fluorescence emission at 693 nm with excitation wavelength at 450 nm in aqueous solution. The fluorescence intensity of NAC-AuNPs was quenched dramatically by adding hydrogen peroxide. Therefore, it could be used to detect hydrogen peroxide based on the fluorescence quenching intensity was linear with the concentration of hydrogen peroxide. Under the optimal experimental conditions, the linear range and detection limit were 1.0×10-6 –3.0×10-2 mol/L and 1.0×10-7 mol/L, respectively. The possible quenching mechanism was investigated by time-resolved fluorescence spectroscopy. The proposed method was simple, sensitive and showed good repeatability and stability.

Understanding the Photoluminescence Mechanism of Carbon Dots

MRS Advances ◽  
2017 ◽  
Vol 2 (51) ◽  
pp. 2927-2934 ◽  
Author(s):  
Zhoufeng Jiang ◽  
Marta J. Krysmann ◽  
Antonios Kelarakis ◽  
Petr Koutnik ◽  
Pavel Anzenbacher ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Time Resolved ◽  
Light Emitting ◽  
Dependent Component ◽  
Different Types ◽  
Photoluminescence Mechanism ◽  
Time Resolved Photoluminescence ◽  
Absolute Quantum

ABSTRACTThe carbon dots were investigated to reveal their light-emitting mechanism. The fluorescence spectra of carbon dots show typically two different types of photoluminescence: the excitation-independent component in the short wavelength, and the excitation-dependent component in the longer wavelength. The UV-Vis spectrum of carbon dots shows the absorption maximum of 340 nm which should be accredited to the n-π* transition of the carbonyl group in carbon dots. Absolute quantum yields of carbon dots dispersed in Polyvinyl alcohol is around 15% when the excitation wavelength is less than 425 nm, but decreases continuously when the excitation wavelength increases. The decay lifetimes of the carbon dots also show an abrupt change at excitation wavelength 425 nm. Time resolved photoluminescence was implemented from 31K to 291K to study the photoluminescence decay dynamics of carbon dots, resulting in the continuously decreasing of the lifetime as the temperature increases.

Facile Preparation of Highly Luminescent Nitrogen-Doped Carbonaceous Nanospheres and Potential Application in Intracellular Imaging of Quercetin

2018 ◽  
Vol 71 (11) ◽  
pp. 882 ◽  
Author(s):  
Buhong Gao ◽  
Yu Sun ◽  
Yingchun Miao ◽  
Huihua Min ◽  
Li Xu ◽  
...  
Keyword(s):  
Hydrothermal Reaction ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Quenching Mechanism ◽  
One Pot ◽  
Intracellular Imaging ◽  
Nitrogen Doped ◽  
N Doping ◽  
Branched Polyethylenimine ◽  
Physical And Chemical

Highly luminescent nitrogen-doped carbonaceous nanospheres (LNCNs) were synthesized by a one-pot hydrothermal reaction of β-cyclodextrin (β-CD) and branched polyethylenimine (BPEI). Both the N-doping and amino-functionalisation of LNCNs were achieved simultaneously. The prepared LNCNs display excellent properties such as high physical and chemical stability, excitation wavelength-independent emission, and high photoluminescence quantum yields. Importantly, the LNCNs exhibit a quenching of photoluminescence in the presence of quercetin (Qc) based on the simple static quenching mechanism, making it possible to quantify concentrations from 0.5 to 80 μg mL−1 with a detection limit of 0.21 μg mL−1. Furthermore, the LNCNs probe was further used for imaging Qc in living cells.

Sign in / Sign up

Export Citation Format

Share Document