Temperature-Dependent Fluorescence in Carbon Dots

Yu, Pyng; Wen, Xiaoming; Toh, Yon-Rui; Tang, Jau

doi:10.1021/jp307308z

Cited by 426 publications

(363 citation statements)

References 55 publications

(93 reference statements)

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“…Fluorescence spectra have been measured in the temperature range 77-300 K for the dry layers of NPs, which were produced from acetic acid. 31 The existence of two energy gaps E g has been deduced and for the smaller one the value E g ¼ 2:197 eV has been obtained, which is in good agreement with our result.…”

supporting

confidence: 89%

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Visible fluorescence of biological fluids as a renal failure marker: New integrative approach

Kuznetsov¹,

Frorip²,

Kozlova

et al. 2015

J. Innov. Opt. Health Sci.

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Solid phases of visible°uorescence substance (VFS) of biological°uids (blood, urine, hemodialysate) which was proposed earlier as a morbidity and mortality marker by renal failure and diabetes were investigated in-depth by the methods of electron and confocal microscopy, optical spectroscopy and matrix assisted laser desorption-ionization (MALDI) mass spectroscopy. It is shown that dry VFS exists predominantly in the form of carbon-oxygen-nitrogen (N % 8:7 wt. %) nanoparticles (NPs) (5 d 100 nm). For the¯rst time the existence of the threshold energy E g % 2:15 eV for excitation of VFS was observed experimentally and con¯rmed by semi-empirical calculations of the bathochromic shift. A good accordance with the earlier autonomous theoretical calculations was achieved. Thus, the long wavelength limit (575 nm) of the spectral range where the VFS can be used as a°uorescent marker was reliably determined. A pilot MALDI comparative study of graphene oxide (GO) and urine VFS was carried out. Six kinds of nitrogenfree particles (412 M 456 Da) were observed in each substance and possible computer models of those have been composed. It is established that along with nitrogen-containing advanced glycation end products (AGEs) also nitrogen-free carbon-oxygen-hydrogen particles (probably toxic) with the composition and structure related to GO can exist in bio°uids. Both types of particles should be taken into account in search for the reasons of high mortality among end stage renal disease patients.

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supporting

confidence: 89%

“…31, the bandwidths of the°uorescence spectra of carbon NPs in dry layers also exhibited independence on temperature changes in the interval 77-300 K. This veri¯cation ascertains once again the validity of parallel consideration of optical phenomena in bio°uids and carbon NPs.…”

supporting

confidence: 72%

Visible fluorescence of biological fluids as a renal failure marker: New integrative approach

Kuznetsov¹,

Frorip²,

Kozlova

et al. 2015

J. Innov. Opt. Health Sci.

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“…The enhanced non-radiative recombination is possibly the main factor for the PL thermal quenching due to the activation of non-radiative recombination centers with temperature increasing. [33][34][35][36] The PL peak of starch/g-CD phosphors shows a red shift of ∼100 eV from 90 to 370 K, which is generally attributed to stronger electron-phonon interaction as the temperature increases (Fig. 4b).…”

Section: Resultsmentioning

confidence: 97%

“…A small change for the FWHM is observed with the temperature increasing, due to dominant temperature-independent electron-electron interaction compared with the temperature-dependent electron-phonon interaction. 33 The PL thermal stability performances of the starch/ g-CD phosphors were also measured at the temperature of 90 and 370 K holding for 2 h in air. No obvious changes in the PL spectra were found in the measured period (Fig.…”

Section: Resultsmentioning

confidence: 99%

Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites

et al. 2014

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Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites Sun, M.; Qu, S.; Hao, Z.; Ji, W.; Jing, P.; Zhang, H.; Zhang, L.; Zhao, J.; Shen, D. Published in: Nanoscale DOI:10.1039/c4nr04034aLink to publication Citation for published version (APA):Sun, M., Qu, S., Hao, Z., Ji, W., Jing, P., Zhang, H., ... Shen, D. (2014). Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites. Nanoscale, 6(21), 13076-13081. DOI: 10.1039/c4nr04034a General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A new type of environmentally friendly phosphor based on carbon nanodots (CDs) has been developed through the dispersion of CDs by integrating the CDs with starch particles. The starch particles contain large numbers of hydroxyl groups around the surfaces, which can effectively absorb the CDs, whose surfaces are functionalized by lots of carboxyl and amide groups, through hydrogen bonding. Effective dispersion of CDs on the surfaces of starch particles can suppress the non-radiative decay processes and photoluminescence (PL) quenching induced by aggregation of CDs. The starch matrix neither competes for absorbing excitation light nor absorbs the emissions of CDs, which leads to efficient PL emitting. As a result, the starch/CD phosphors with a quantum yield of ∼50% were obtained. The starch/CD phosphors show great potential in phosphor-based light emitting diodes, temperature sensors, and patterning.

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“…Mechanistically, both the optical absorption and fluorescence emissions in carbon dots do not originate from a band gap, but instead are due to p-plasmon and radiative recombination of the surface-confined electrons and holes, different from those in conventional semiconductor QDs. [2][3][4][5] The synthetic method for the production of carbon quantum dots can be divided in two main categories: topdown and bottom-up methods. Top-down methods involve "breaking" larger carbon structures into smaller pieces while the bottom-up methods rely on forming the CQDs from molecular precursors.…”

mentioning

confidence: 99%

Biomass‐Derived Carbon Quantum Dot Sensitizers for Solid‐State Nanostructured Solar Cells

et al. 2015

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New hybrid materials consisting of ZnO nanorods sensitized with three different biomass-derived carbon quantum dots (CQDs) were synthesized, characterized, and used for the first time to build solid-state nanostructured solar cells. The performance of the devices was dependent on the functional groups found on the CQDs. The highest efficiency was obtained using a layer-by-layer coating of two different types of CQDs.

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Temperature-Dependent Fluorescence in Carbon Dots

Cited by 426 publications

References 55 publications

Visible fluorescence of biological fluids as a renal failure marker: New integrative approach

Visible fluorescence of biological fluids as a renal failure marker: New integrative approach

Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites

Biomass‐Derived Carbon Quantum Dot Sensitizers for Solid‐State Nanostructured Solar Cells

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