Solvothermal conversion of coal into nitrogen-doped carbon dots with singlet oxygen generation and high quantum yield

Li, Mingyu; Yu, Chang; Hu, Chao; Yang, Wenbo; Shuai, Wang; Zhang, Mengdi; Zhao, Jianzhang; Wang, Xiuna; Qiu, Jieshan

doi:10.1016/j.cej.2017.03.090

Cited by 136 publications

(68 citation statements)

References 46 publications

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“…Among natural polymers, gelatin due to its good pharmacological characteristics (as excellent biocompatibility and degradability to non-toxic products) and low cost, could be an excellent candidate for the synthesis of CDs [14,15]. Commonly techniques have been used to synthesis CDs to include electrochemical synthesis [16,17], chemical oxidation [18], laser ablation of graphite [19], ultrasonic methods [20], hydrothermal [21,22], solvothermal [23] and microwave-assisted pyrolysis [24,25]. However, most of these techniques may involve a) complex reactions, b) time-consuming processes, c) post-treatment procedures and d) an expensive carbon source, which limit the applications of CDs.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted and one-step synthesis of PEG passivated fluorescent carbon dots from gelatin as an efficient nanocarrier for methotrexate delivery

Arsalani

Nezhad‐Mokhtari

Jabbari

2019

Artificial Cells, Nanomedicine, and Biotechnology

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A green and simple process for preparing the polyethylene glycol passivated fluorescent carbon dots (CDs-PEG) have been studied by a microwave pyrolysis method, using gelatin and PEG as starting materials. This method is very effective for development of carbon-based quantum dots from gelatin with high quantum yield (QY). The synthesized CDs-PEG were found to emit blue photoluminescence (PL) with a maximum QY of 34%. At the following research, we investigated the effect of the presence of PEG on PL intensity, and the result showed that CDs-PEG becomes stronger PL properties than pure CDs from gelatin. The synthesized CDs-PEG were characterized by FTIR, TEM, UV-vis, PL, zeta potential and XRD analyses. The anticancer performance of developed CDs-PEG was evaluated by in vitro tests such as MTT assay and fluorescence microscopy analyses. The examination of CDs-PEG as an anticancer drug nanocarrier for methotrexate (MTX) illustrated a better antitumor efficacy than free MTX due to its enhanced nuclear delivery in vitro, which resulting in highly effective tumour growth inhibition and improving targeted cancer therapy in clinical medicine.

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Section: Introductionmentioning

confidence: 99%

Microwave-assisted and one-step synthesis of PEG passivated fluorescent carbon dots from gelatin as an efficient nanocarrier for methotrexate delivery

Arsalani

Nezhad‐Mokhtari

Jabbari

2019

Artificial Cells, Nanomedicine, and Biotechnology

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“…Hydrothermal synthesis that employs water as the solvent is one of the simplest and cost-effective methods to prepare CDs. Solvothermal, on the other hand, uses other solvents such as ethanol and dimethylformamide [82,83]. Li et al [83] prepared CDs using a one-pot solvothermal technique with Taixi anthracite in DMF.…”

Section: Carbon Dotsmentioning

confidence: 99%

“…Solvothermal, on the other hand, uses other solvents such as ethanol and dimethylformamide [82,83]. Li et al [83] prepared CDs using a one-pot solvothermal technique with Taixi anthracite in DMF. The resultant CDs exhibited a strong photoluminescence quantum yield of 47% and a production yield of 25.6 wt%.…”

Section: Carbon Dotsmentioning

confidence: 99%

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Yap

Chan

Tjin

et al. 2020

Sensors

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Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.2 of 43 of target molecules or physical parameters. In some instances, surface-modified carbon allotropes also permit multi-parameter detection capabilities of carbon allotrope-based OFS [7]. As such, an insight into the recent advances of carbon allotrope-based OFS can serve as a guideline to develop an effective detection approach for emerging real-world applications. Many review articles on carbon allotrope-based OFS mainly focus on a single type of carbon allotrope and the fundamental theory of carbon allotrope-based OFS [8,9]. Thus, this comprehensive review article encompasses the properties, preparation, sensing mechanisms, nanocoating deposition techniques, physical and biochemical sensing applications. This review aims to highlight the recent research work on carbon allotrope-based OFS that will serve as a reference guide for researchers to develop optimal detection approaches for physical parameters or trace level monitoring of chemical and biomolecules. Four groups of carbon allotropes, including carbon nanotubes (CNT), carbon dots (CDs), graphene, and nanodiamonds (NDs), will be studied. Commonly adopted synthesis approaches, classification of various deposition techniques for the integration of carbon allotropes as the thin film coating of OFS as well as numerous examples of these carbon allotrope-based OFS will also be outlined.

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“…Additionally, the cheapest price and substantial deposits of coal, in contrast to crystalline carbon such as graphene, carbon tubes and fullerenes, have attracted tremendous interest and efforts in developing preparation methods of CQDs from coal. Up to now, CQDs have been successfully prepared from coal by different methods (Ye et al, 2013;Dong et al, 2014;Hu et al, 2015Hu et al, , 2016Sasikala et al, 2016;Li et al, 2017;Liu X. et al, 2018;Saikia et al, 2019). Ye et al (2013) employed concentrated sulfuric acid and nitric acid to exfoliate CQDs from coal at 100 • or 120 • C for 24 h. Similarly, CQDs were obtained through refluxing coal in 5 M HNO 3 at 120 • C for 12 h (Dong et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

et al. 2020

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Low-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs usually emit green or blue fluorescence. Herein, a facile two-step oxidation approach (K 2 FeO 4 pre-oxidation and H 2 O 2 oxidation) was proposed to fabricate bandgap tunable CQDs from anthracite. The K 2 FeO 4 pre-oxidation can not only weaken the non-bonding forces among coal molecules which cause the expansion of coal particles, but also form a large number of active sites on the surface of coal particles. The above effects make the bandgap tunable CQDs (blue, green, or yellow fluorescence) can be quickly obtained from anthracite within 1 h in the following H 2 O 2 oxidation by simply adjusting the concentration of H 2 O 2 . All the as-prepared CQDs contain more than 30 at% oxygen, and the average diameters of which are <10 nm. The results also indicate that the high oxygen content only can create new energy states inside the band gap of CQDs with average diameter more than 3.2 ± 0.9 nm, which make the as-prepared CQDs emit green or yellow fluorescence.

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Solvothermal conversion of coal into nitrogen-doped carbon dots with singlet oxygen generation and high quantum yield

Cited by 136 publications

References 46 publications

Microwave-assisted and one-step synthesis of PEG passivated fluorescent carbon dots from gelatin as an efficient nanocarrier for methotrexate delivery

Microwave-assisted and one-step synthesis of PEG passivated fluorescent carbon dots from gelatin as an efficient nanocarrier for methotrexate delivery

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

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