Luminescent graphene quantum dots fabricated by pulsed laser synthesis

Habiba, Khaled; Makarov, Vladimir I.; Ávalos, Javier; Guinel, Maxime J.-F.; Weiner, Brad R.; Morell, Gerardo

doi:10.1016/j.carbon.2013.07.084

Cited by 144 publications

(101 citation statements)

References 44 publications

(103 reference statements)

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“…47 The UV-Vis spectrum ( Figure 3B) displays an absorption at ~420 nm corresponding to the localized surface plasmon of silver, 48 and the absorption at ~270 nm is attributed to π−π* transition of aromatic sp 2 domains that is commonly observed in graphene and graphite nanostructures. 41 The XRD and UV-Vis data are in good agreement with the HR-TEM data obtained earlier. …”

Section: Results and Discussion Synthesis And Characterization Of Ag-supporting

confidence: 89%

“…The d-spacing of 0.145 nm corresponds to the (220) plane of silver, 44 and the d-spacing of 0.214 nm corresponds to the (110) plane of GQDs. 41,45 We used the XRD technique to identify the presence of silver and GQDs in the nanocomposites. The XRD pattern ( Figure 3A) of the Ag-GQDs powder shows the presence of nine peaks.…”

Section: Results and Discussion Synthesis And Characterization Of Ag-mentioning

confidence: 99%

“…41,42 To functionalize the synthesized bare GQDs with PEG, we modified the irradiated mixture as follows. A 0.25 wt% mixture of nickel oxide powder (Alfa Aesar, Ward Hill, MA, USA) and 1.25 wt% of PEG bis (3-aminopropyl) terminated (Sigma-Aldrich St Louis, MO, USA) in 98.5 wt% benzene (Sigma-Aldrich) was irradiated for …”

Section: Methods and Materials Synthesis Of Bare Gqds And Ag-gqdsmentioning

confidence: 99%

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Improving cytotoxicity against cancer cells by chemo-photodynamic combined modalities using silver-graphene quantum dots nanocomposites

Habiba¹,

Encarnación-Rosado²,

García-Pabón³

et al. 2015

IJN

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The combination of chemotherapy and photodynamic therapy has emerged as a promising strategy for cancer therapy due to its synergistic effects. In this work, PEGylated silver nanoparticles decorated with graphene quantum dots (Ag-GQDs) were tested as a platform to deliver a chemotherapy drug and a photosensitizer, simultaneously, in chemo-photodynamic therapy against HeLa and DU145 cancer cells in vitro. Ag-GQDs have displayed high efficiency in delivering doxorubicin as a model chemotherapy drug to both cancer cells. The Ag-GQDs exhibited a strong antitumor activity by inducing apoptosis in cancer cells without affecting the viability of normal cells. Moreover, the Ag-GQDs exhibited a cytotoxic effect due to the generation of the reactive singlet oxygen upon 425 nm irradiation, indicating their applicability in photodynamic therapy. In comparison with chemo or photodynamic treatment alone, the combined treatment of Ag-GQDs conjugated with doxorubicin under irradiation with a 425 nm lamp significantly increased the death in DU145 and HeLa. This study suggests Ag-GQDs as a multifunctional and efficient therapeutic system for chemo-photodynamic modalities in cancer therapy.

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Section: Results and Discussion Synthesis And Characterization Of Ag-supporting

confidence: 89%

Section: Results and Discussion Synthesis And Characterization Of Ag-mentioning

confidence: 99%

Section: Methods and Materials Synthesis Of Bare Gqds And Ag-gqdsmentioning

confidence: 99%

See 1 more Smart Citation

Improving cytotoxicity against cancer cells by chemo-photodynamic combined modalities using silver-graphene quantum dots nanocomposites

Habiba¹,

Encarnación-Rosado²,

García-Pabón³

et al. 2015

IJN

Self Cite

View full text Add to dashboard Cite

show abstract

“…38 The carbonaceous materials may be carbon fibers, 7 graphene, 30 GO, 39 graphite, 37,[40][41][42][43]44 carbon black, 45 carbon nanotubes, 46,47 coal. 48 Here, we summarize the top-down synthesis of GQDs and the related cutting mechanisms.…”

Section: Top-down Strategiesmentioning

confidence: 99%

Properties and Synthesis Strategies of Graphene Quantum Dots

Zhang¹,

Lu²

2017

Frontiers in Nanobiomedical Research

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Quantum dots (QDs) are usually referred to as semiconductor nanoparticles with their sizes in the quantum-confined regime, in which the excitons are confined in all the three spatial dimensions. Typical QDs are inorganic semiconductor nanocrystals from the group II-VI elements in the periodic table. However, the applications of these QDs are limited by their internal disadvantages, including intrinsic toxicity (e.g. in the case of widely studied CdSe QDs) and problems caused by the colloidal stability. Therefore, developing new QDs and relevant nanomaterials is necessary. Consequently, graphene quantum dots (GQDs), a class of zero-dimensional (0D) graphitic nanomaterials, have attracted increasing attention recently. Compared with semiconductor QDs, GQDs are superior in terms of low cytotoxicity, high dispersity in water and some polarity organic solvents, resistance to photobleaching and biocompatibility. In addition, the properties of GQDs are easier to be tuned through surface chemistry, indicating that researchers can design GQDs with various functionalities for different applications.

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“…e size-selected GQDs and GQDs-Fe 3 O 4 NCs were synthesized via a bottom-up approach using pulsed laser-induced irradiation in solution as reported earlier by Habiba et al [14] with some modifications in experimental parameters. Specifically, the bottom-up method involves photolytic cracking of C 6 H 6 by laser irradiation in the illuminated region of solution.…”

Section: Experimental Approachmentioning

confidence: 99%

Synthesis, Optical, and Magnetic Properties of Graphene Quantum Dots and Iron Oxide Nanocomposites

Sajjad

Makarov

Sultan

et al. 2018

Advances in Materials Science and Engineering

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e combination of nanomaterial graphene quantum dots (GQDs) with magnetic nanoparticles offers a unique set of optical and magnetic properties for future energy and medical applications. We report on the synthesis and engineering of GQDs and iron oxide (Fe 3 O 4 ) nanocomposites (NCs) by using a pulsed laser discharge technique. High-resolution transmission electron microscopy (HRTEM) images showed a high yield of pure GQDs with 2-10 nm diameter. e hexagonal structures and lattice fringes associated with the C-C bond in GQDs were clearly identifiable. e structural and optical changes in GQDs and GQDsFe 3 O 4 NC samples induced by UV light were investigated by the absorption and emission spectroscopy over the deep UV-visible spectral range. e photoluminescence spectra have shown subband π→π * transitions in GQDs-Fe 3 O 4 NC. Magnetic properties of the GQDs-Fe 3 O 4 NC samples have shown room temperature ferromagnetism induced by pure Fe 3 O 4 nanoparticles and from the substantial spin polarized edges of GQD nanoparticles. It is concluded that the observed optical and magnetic properties could be further tailored in the studied nanocomposites for prospective medical applications.

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Luminescent graphene quantum dots fabricated by pulsed laser synthesis

Cited by 144 publications

References 44 publications

Improving cytotoxicity against cancer cells by chemo-photodynamic combined modalities using silver-graphene quantum dots nanocomposites

Improving cytotoxicity against cancer cells by chemo-photodynamic combined modalities using silver-graphene quantum dots nanocomposites

Properties and Synthesis Strategies of Graphene Quantum Dots

Synthesis, Optical, and Magnetic Properties of Graphene Quantum Dots and Iron Oxide Nanocomposites

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