Journal ArticleDOI
Quantum-sized carbon dots for bright and colorful photoluminescence.
Ya-Ping Sun,Bing Zhou,Yi Lin,Wei Wang,K. A. Shiral Fernando,Pankaj Pathak,Mohammed J. Meziani,Barbara A. Harruff,Xin Wang,Haifang Wang,Pengju G. Luo,Hua Yang,Muhammet E. Köse,Bailin Chen,L. Monica Veca,Su-Yuan Xie +15 more
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TLDR
It is reported that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state.Abstract:
We report that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state. The luminescence emission of the carbon dots is stable against photobleaching, and there is no blinking effect. These strongly emissive carbon dots may find applications similar to or beyond those of their widely pursued silicon counterparts.read more
Citations
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A facile large-scale microwave synthesis of highly fluorescent carbon dots from benzenediol isomers
Jun Wang,Changming Cheng,Ying Huang,Baozhan Zheng,Hongyan Yuan,Lin Bo,Ming-Wu Zheng,Sheng-Yong Yang,Yong Guo,Dan Xiao +9 more
TL;DR: In this paper, a fast large-scale synthesis of fluorescent carbon dots (CDs) has been developed in this work without high temperature or high pressure, using benzenediols (catechol, resorcinol and hydroquinone) as the carbon precursor and sulfuric acid as the catalyst.
Journal ArticleDOI
Unanticipated bright blue fluorescence produced from novel hyperbranched polysiloxanes carrying unconjugated carbon–carbon double bonds and hydroxyl groups
TL;DR: One-pot polycondensation reaction of triethoxyvinylsilane (A-151) with excessive neopentyl glycol (NPG) is employed as an efficient and facile methodology for the synthesis of novel hyperbranched polysiloxanes contemporaneously bearing plenty of unconjugated carbon-carbon double bonds and hydroxyl groups as discussed by the authors.
Journal ArticleDOI
The synthesis of fluorescent carbon dots from mango peel and their multiple applications
TL;DR: In this article, an eco-friendly approach which combined pyrolyzation with oxygenolysis was adopted to produce CDs from mango peel without any other treatment, and the prepared CDs were 2-6"nm nanoparticles with a high fluorescence quantum yield of 8.5"±"0.2".
Journal ArticleDOI
Highly sensitive humidity sensing properties of carbon quantum dots films
TL;DR: In this article, the authors reported the fabrication of a humidity sensing device based on carbon quantum dots (CQDs) film and showed that the conductivity of the CQDs film has a linear and rapid response to relative humidity, providing the opportunity for fabrication of humidity sensing devices.
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Green, Water-Dispersible Photoluminescent On-Off-On Probe for Selective Detection of Fluoride Ions.
TL;DR: This is the first report based on CQDs and Eu3+ for the detection of fluoride ions, wherein a clear mechanism of the detection has been demonstrated and will help to develop better detection methods.
References
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Journal ArticleDOI
Quantum Dots for Live Cells, in Vivo Imaging, and Diagnostics
Xavier Michalet,Fabien Pinaud,Laurent A. Bentolila,James M. Tsay,Sören Doose,J. Jack Li,Gobalakrishnan Sundaresan,Anna M. Wu,Sanjiv S. Gambhir,Sanjiv S. Gambhir,Shimon Weiss +10 more
TL;DR: The new generations of qdots have far-reaching potential for the study of intracellular processes at the single-molecule level, high-resolution cellular imaging, long-term in vivo observation of cell trafficking, tumor targeting, and diagnostics.
Journal ArticleDOI
Probing the Cytotoxicity Of Semiconductor Quantum Dots.
TL;DR: This work found that CdSe-core QDs were indeed acutely toxic under certain conditions and modulated by processing parameters during synthesis, exposure to ultraviolet light, and surface coatings, and suggests that cytotoxicity correlates with the liberation of free Cd2+ ions due to deterioration of the Cd Se lattice.
Journal ArticleDOI
Fluorescence intermittency in single cadmium selenide nanocrystals
M. Nirmal,M. Nirmal,B. O. Dabbousi,Moungi G. Bawendi,John J. Macklin,John J. Macklin,J. K. Trautman,J. K. Trautman,Timothy D. Harris,Timothy D. Harris,Louis E. Brus,Louis E. Brus +11 more
TL;DR: In this article, it was shown that light emission from single fluorescing nanocrystals of cadmium selenide under continuous excitation turns on and off intermittently with a characteristic timescale of about 0.5 seconds.
Journal ArticleDOI
Cytotoxicity of colloidal CdSe and CdSe/ZnS nanoparticles.
Christian Kirchner,Tim Liedl,Stefan Kudera,Teresa Pellegrino,Almudena Muñoz Javier,Hermann E. Gaub,Sonja Stölzle,Niels Fertig,Wolfgang J. Parak +8 more
TL;DR: The data suggest that in addition to the release of toxic Cd(2+) ions from the particles also their surface chemistry, in particular their stability toward aggregation, plays an important role for cytotoxic effects.
Journal ArticleDOI
Control of Thickness and Orientation of Solution-Grown Silicon Nanowires
TL;DR: Bulk quantities of defect-free silicon nanowires with nearly uniform diameters were grown to a length of several micrometers with a supercritical fluid solution-phase approach, and visible photoluminescence due to quantum confinement effects was observed, as were discrete optical transitions in the ultraviolet-visible absorbance spectra.