Molecular crowding-facilitated synthesis of DNA-templated Ag nanoclusters with enhanced fluorescence emission and quantum yield

2013 ◽  
Vol 49 (92) ◽  
pp. 10856 ◽  
Author(s):  
Zhenzhen Huang ◽  
Jinsong Ren ◽  
Wensheng Yang ◽  
Xiaogang Qu
Keyword(s):  
Quantum Yield ◽  
Fluorescence Emission ◽  
Molecular Crowding ◽  
Enhanced Fluorescence ◽  
Ag Nanoclusters

Enhanced-Fluorescence of a Dye on DNA- assembled Gold Nano-Dimers Discriminated by Lifetime Correlation Spectroscopy

2017 ◽  
Author(s):  
Pedro M. R. Paulo ◽  
David Botequim ◽  
Agnieszka Jóskowiak ◽  
Sofia Martins ◽  
Duarte M. F. Prazeres ◽  
...  
Keyword(s):  
Single Molecule ◽  
Fluorescence Emission ◽  
Directed Assembly ◽  
Plasmon Mode ◽  
Correlation Spectroscopy ◽  
Enhanced Fluorescence ◽  
Detection Volume ◽  
Relaxation Component ◽  
Good Agreement ◽  
Confocal Detection

<div> <div> <div> <p>We have employed DNA-directed assembly to prepare dimers of gold nanoparticles and used their longitudinally coupled plasmon mode to enhance the fluorescence emission of an organic red-emitting dye, Atto-655. The plasmon- enhanced fluorescence of this dye using dimers of 80 nm particles was measured at single molecule detection level. The top enhancement factors were above 1000-fold in 71% of the dimers within a total of 32 dimers measured, and, in some cases, they reached almost 4000-fold, in good agreement with model simulations. Additionally, fluorescence lifetime correlation analysis enabled the separation of enhanced from non-enhanced emission simultaneously collected in our confocal detection volume. This approach allowed us to recover a short relaxation component exclusive to enhanced emission that is attributed to the interaction of the dye with DNA in the interparticle gaps. </p> </div> </div> </div>

UV-Trained and Metal-Enhanced Fluorescence of Biliverdin and Biliverdin Nanoparticles

Nanoscale ◽  
2021 ◽  
Author(s):  
Parinaz Fathi ◽  
Ayman Roslend ◽  
Kritika Mehta ◽  
Parikshit Moitra ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Biomedical Imaging ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence

Increasing the fluorescence quantum yield of fluorophores is of great interest for in vitro and in vivo biomedical imaging applications. At the same time, photobleaching and photodegradation resulting from continuous...

PEGylated AIEgen Molecular Probe for Hypoxia-Mediated Tumor Imaging and Photodynamic Therapy

2021 ◽  
Author(s):  
Jun Li ◽  
Wei Liu ◽  
Zhuhao Li ◽  
Yingcai Hu ◽  
Jinfeng Yang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Tumor Imaging ◽  
Fluorescence Emission ◽  
Molecular Probe ◽  
Enhanced Fluorescence ◽  
High Concentrations

Unlike the aggregation caused quenching (ACQ) and reduced singlet oxygen (1O2) production of traditional photosensitizers at high concentrations, AIEgen photosensitizers show enhanced fluorescence emission and photosensitization ability in the aggregated...

scholarly journals Enhanced fluorescence emission using a photonic crystal coupled to an optical cavity

CLEO: 2013 ◽  
2013 ◽  
Author(s):  
Anusha Pokhriyal ◽  
Meng Lu ◽  
Vikram Chaudhery ◽  
Sherine George ◽  
Brian T. Cunningham
Keyword(s):  
Photonic Crystal ◽  
Optical Cavity ◽  
Fluorescence Emission ◽  
Enhanced Fluorescence

scholarly journals Plasmonic zero mode waveguide for highly confined and enhanced fluorescence emission

Nanoscale ◽  
2018 ◽  
Vol 10 (36) ◽  
pp. 17362-17369 ◽  
Author(s):  
Paolo Ponzellini ◽  
Xavier Zambrana-Puyalto ◽  
Nicolò Maccaferri ◽  
Luca Lanzanò ◽  
Francesco De Angelis ◽  
...  
Keyword(s):  
Single Molecule ◽  
Experimental Verification ◽  
Zero Mode ◽  
Fluorescence Emission ◽  
Enhanced Fluorescence

Experimental verification of a plasmonic zero mode waveguide able to enhance fluorescence from a single molecule in a confined volume.

scholarly journals Magnetron-Sputtered Polytetrafluoroethylene-Stabilized Silver Nanoisland Surface for Surface-Enhanced Fluorescence

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 773 ◽  
Author(s):  
Martin Šubr ◽  
Petr Praus ◽  
Anna Kuzminova ◽  
Eva Kočišová ◽  
Ondřej Kylián ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Radiative Decay ◽  
Adsorbed Layer ◽  
Localized Surface Plasmon ◽  
Homogeneous Layer ◽  
Excitation Wavelength ◽  
Sessile Droplet ◽  
Enhanced Fluorescence ◽  
Surface Enhanced Fluorescence ◽  
Surface Enhanced

Surface-enhanced fluorescence (SEF) requires the absorption/emission band of the fluorophore, the localized surface plasmon resonance (LSPR) of the nanostructure and the excitation wavelength to fall in the same (or very close) spectral range. In this paper, we monitor the SEF intensity and lifetime dependence of riboflavin (vitamin B2) adsorbed on a spacer-modified Ag substrate with respect to the thickness of the spacer. The substrates were formed by silver nanoislands deposited onto magnetron-sputtered polytetrafluoroethylene (ms-PTFE). The spacer was formed by the ms-PTFE layer with the thickness ranging from ~5 to 25 nm. The riboflavin dissolved in dimethylsulfoxide (DMSO) at a 10 µM concentration forms, at the ms-PTFE surface, a homogeneous layer of adsorbed molecules corresponding to a monomolecular layer. The microspectroscopic measurements of the adsorbed layer were performed through a sessile droplet; our study has shown the advantages and limitations of this approach. Time-resolved fluorescence enabled us to determine the enhanced fluorescence quantum yield due to the shortening of the radiative decay in the vicinity of the plasmonic surface. For the 5 nm ms-PTFE layer possessing the largest (estimated 4×) fluorescence enhancement, the quantum yield was increased 2.3×.

Investigation of a novel triazatetrabenzcorrole photosensitizer

2002 ◽  
Vol 06 (07) ◽  
pp. 484-488 ◽  
Author(s):  
Zhenglin Song ◽  
Fushi Zhang ◽  
Xue Li ◽  
Shek-Kiu Chan ◽  
Fuqun Zhao ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Fluorescence Emission Spectra ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Sulfo Groups

A novel phthalocyanine-like photosensitizer, oxophosphorus(V) tetrasulfotriaza-tetrabenzcorrole ( POTBCS 4), has been synthesized. Its structure and absorption spectrum are unique. POTBCS 4 has an axial P = O group and peripheral sulfo groups. The fluorescence emission spectra, fluorescence quantum yield and quantum yield of singlet oxygen generation have been studied. The uptake and the photodynamic activities against HeLa cells were measured. The results indicated that POTBCS 4 was a potential photosensitizer for photodynamic therapy (PDT).

A mechano-responsive fluorescent xerogel based on an anthracene-substituted acylhydrazone derivative

2019 ◽  
Vol 43 (13) ◽  
pp. 5214-5218 ◽  
Author(s):  
Yilin Chen ◽  
Binglian Bai ◽  
Qing Chai ◽  
Jue Wei ◽  
Haitao Wang ◽  
...  
Keyword(s):  
Fluorescence Emission ◽  
Enhanced Fluorescence

AHBP-8 can form a stable organogel and enhanced fluorescence emission has been observed after gelation. The AHBP-8 xerogel exhibited favorable mechano-fluorochromism behavior.

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