UV light-switchable transparent polymer films and invisible luminescent inks based on carbon dots and lanthanide complexes

2016 ◽  
Vol 4 (30) ◽  
pp. 7253-7259 ◽  
Author(s):  
Yu Wang ◽  
Klára Čépe ◽  
Radek Zbořil
Keyword(s):  
Polymer Films ◽  
Carbon Dots ◽  
Lanthanide Complexes ◽  
Uv Light ◽  
Simple Approach ◽  
Composite Polymer ◽  
Transparent Composite

We present a simple approach for the preparation of UV light-switchable transparent composite polymer films and invisible luminescent inks based on the combination of carbon dots (CDs) and trisdipicolinate lanthanide complexes.

Studies on PEO-based sodium ion conducting composite polymer films

Ionics ◽  
2007 ◽  
Vol 14 (3) ◽  
pp. 255-262 ◽  
Author(s):  
Saumya R. Mohapatra ◽  
Awalendra K. Thakur ◽  
R. N. P. Choudhary
Keyword(s):  
Polymer Films ◽  
Sodium Ion ◽  
Composite Polymer ◽  
Conducting Composite ◽  
Ion Conducting

scholarly journals Identification of Molecular Fluorophore as a Component of Carbon Dots able to Induce Gelation in a Fluorescent Multivalent-Metal-Ion-Free Alginate Hydrogel

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Peter Kasak ◽  
Martin Danko ◽  
Sifani Zavahir ◽  
Miroslav Mrlik ◽  
Yuan Xiong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Metal Ion ◽  
Divalent Metal ◽  
Simple Approach ◽  
Sodium Ions ◽  
Divalent Metal Ions ◽  
Alginate Hydrogel ◽  
Carboxylic Acid Groups ◽  
Multivalent Metal

Abstract We introduce a simple approach to fabricate fluorescent multivalent metal ion-free alginate hydrogels, which can be produced using carbon dots accessible from natural sources (citric acid and L-cysteine). Molecular fluorophore 5-oxo-2,3-dihydro-5H-[1,3]-thiazolo[3,2-a] pyridine-3,7-dicarboxylic acid (TPDCA), which is formed during the synthesis of carbon dots, is identified as a key segment for the crosslinking of hydrogels. The crosslinking happens through dynamic complexation of carboxylic acid groups of TPDCA and alginate cages along with sodium ions. The TPDCA derived hydrogels are investigated regarding to their thermal, rheological and optical properties, and found to exhibit characteristic fluorescence of this aggregated molecular fluorophore. Moreover, gradient hydrogels with tunable mechanical and optical properties and controlled release are obtained upon immersion of the hydrogel reactors in solutions of divalent metal ions (Ca2+, Cu2+, and Ni2+) with a higher affinity to alginate.

scholarly journals Visible-Light-Excited Room Temperature Phosphorescent Carbon Dots

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 464 ◽  
Author(s):  
Sizhe Hu ◽  
Kai Jiang ◽  
Yuci Wang ◽  
Sui Wang ◽  
Zhongjun Li ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Carbon Dots ◽  
Short Wavelength ◽  
Room Temperature ◽  
Uv Light ◽  
Long Wavelength ◽  
Heating Treatment ◽  
First Time ◽  
Matrix Free

Carbon dots (CDs) with a room temperature phosphorescent (RTP) feature have attracted considerable interest in recent years due to their fundamental importance and promising applications. However, the reported matrix-free RTP CDs only show short-wavelength (green to yellow) emissions and have to be triggered by ultraviolet (UV) light (below 400 nm), limiting their applications in certain fields. Herein, visible-light-excited matrix-free RTP CDs (named AA-CDs) with a long-wavelength (orange) emission are reported for the first time. The AA-CDs can be facilely prepared via a microwave heating treatment of L-aspartic acid (AA) in the presence of ammonia and they emit unique orange RTP in the solid state with visible light (420 nm) excitation just being switched off. Through the studies of the carbonization process, the C=O and C=N containing moieties in the AA-CDs are confirmed to be responsible for the observed RTP emission. Finally, the applications of AA-CDs in information encryption and anti-counterfeiting were preliminarily demonstrated.

scholarly journals In situ synthesis of stretchable and highly stable multi-color carbon-dots/polyurethane composite films for light-emitting devices

RSC Advances ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 1281-1286 ◽  
Author(s):  
Fei Lian ◽  
Chuanxi Wang ◽  
Qian Wu ◽  
Minghui Yang ◽  
Zhenyu Wang ◽  
...  
Keyword(s):  
Polymer Films ◽  
Carbon Dots ◽  
Composite Films ◽  
Optoelectronic Devices ◽  
In Situ Synthesis ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Polyurethane Composite

Stretchable, mechanically stable multi-color carbon-dots-based polymer films are in situ fabricated, and showed potential for application in optoelectronic devices.

Contact active antibacterial phosphonium coatings cured with UV light

2015 ◽  
Vol 3 (8) ◽  
pp. 1474-1478 ◽  
Author(s):  
Tyler J. Cuthbert ◽  
Ryan Guterman ◽  
Paul J. Ragogna ◽  
Elizabeth R. Gillies
Keyword(s):  
High Stability ◽  
Uv Light ◽  
Uv Curing ◽  
Simple Approach

Antibacterial phosphonium coatings were prepared by UV curing of phosphonium monomers. The simple approach and high stability of phosphoniums relative to ammoniums makes these coatings promising alternatives to ammonium surfaces.

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