Thermal treatment of hair for the synthesis of sustainable carbon quantum dots and the applications for sensing Hg2+

Guo, Yongming; Zhang, Lianfeng; Cao, Fengpu; Leng, Yumin

doi:10.1038/srep35795

Cited by 154 publications

(101 citation statements)

References 37 publications

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“…For example, hair can be used as carbon source for the synthesis of CQDs, in utilization of its main component of keratin. A one-step thermal treatment of hair at 200°C for about 24 h was reported by Guo et al to obtain CQDs, with the yield estimated to be about 95% [27]. Thanks to the diversity and plenty of biomass, the large-scale synthesis of CQDs from biomass is of great potential especially in view of practical applications.…”

Section: Bottom-up Routementioning

confidence: 99%

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Cong,

Zhao

2018

Visible-Light Photocatalysis of Carbon-Based Materials

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Carbon quantum dots (CQDs) have been developed as a new member of nanocarbons, characterized by the relatively easy preparation from a wide spectrum of carbonaceous precursors through either bottom-up or top-down routes. Attractive optoelectronic properties have been observed with CQDs, including efficient light absorption, variable photoluminescence (PL), unique up-conversion PL and prominent electron transport ability, which make CQDs an important component with great potential in the design of efficient visible light-driven photocatalysts. In this chapter, detailed contribution of CQDs to the enhanced visible light-driven photocatalysis will be included, in the classification of the role as electron mediator, photosensitizer, spectral converter and sole photocatalyst.

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Section: Bottom-up Routementioning

confidence: 99%

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Cong,

Zhao

2018

Visible-Light Photocatalysis of Carbon-Based Materials

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“…Even in a solution with salt concentration higher than 1.25 M, the fluorescence intensity of CQDs and M-CQDs was still comparable with that in DI water, indicative of the superior colloidal stability. 45 The negligible fluorescence fluctuation over a broad range of salt concentrations demonstrates that the CQDs and M-CQDs are suitable for biological imaging applications. Furthermore, the CQDs and M-CQDs show excellent photostability, as shown in Figures 6H and S8.…”

mentioning

confidence: 99%

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Wang

et al. 2017

IJN

159

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N-rich metal-free and metal-doped carbon quantum dots (CQDs) have been prepared through one-step hydrothermal method using tetraphenylporphyrin or its transition metal (Pd or Pt) complex as precursor. The structures and morphology of the as-prepared nanoparticles were analyzed by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectra. Three kinds of nanocomposites show similar structures except for the presence of metal ions in Pd-CQDs and Pt-CQDs indicated by X-ray photoelectron spectroscopy. All of them display bright blue emission upon exposure to ultraviolet irradiation. The CQDs exhibit typical excitation-dependent emission behavior, with the emission quantum yield of 10.1%, 17.8%, and 15.2% for CQDs, Pd-CQDs, and Pt-CQDs, respectively. Moreover, the CQDs, Pd-CQDs, and Pt-CQDs could serve as fluorescent probes for the specific and sensitive detection of Fe 3+ ions in aqueous solution. The low cytotoxicity of CQDs is demonstrated by MTT assay against HeLa cells. Therefore, the CQDs can be used as efficient probes for cellular multicolor imaging and fluorescence sensors for the detection of Fe 3+ ions due to their low toxicity, excellent biocompatibility, and low detection limits. This work provides a new route to synthesize highly luminescent N-rich metal-free or metal-doped CQDs for multifunctional applications.

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“…25,26 The lifetime of NB-CQDs was about 3.3581 ns. However, in the presence of 100 and 500 mM, the lifetime of NB-CQDs was 3.3857 ns and 3.3708 ns, respectively (Fig.…”

mentioning

confidence: 99%

“…S12 †). 25,26 And the uorescence lifetime test can be utilized to reveal the uorescence quenching mechanism because the static quenching process is related , respectively).…”

mentioning

confidence: 99%

Hydrothermal synthesis of nitrogen and boron doped carbon quantum dots with yellow-green emission for sensing Cr(vi), anti-counterfeiting and cell imaging

et al. 2017

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Nitrogen and boron doped carbon quantum dots (NB-CQDs) with yellow-green emission were prepared via hydrothermal method using 2-hydroxyphenylboronic acid and ethylenediamine in aqueous solution.The as-prepared NB-CQDs exhibited bright yellow-green emission, excellent stability in aqueous solution with high ionic strength and good biocompatibility. We further explored the applications of NBCQDs for sensing metal ions in aqueous solution. We found that the NB-CQDs could be utilized to sense Cr 2 O 7 2À in aqueous solution due to the Cr 2 O 7 2À-induced fluorescence quenching. In the sensing system, as low as 0.5 mM Cr 2 O 7 2À can be successfully detected and a good linear relationship in the range of 0-250 mM has been obtained. And the NB-CQDs can be also used as ink for writing on paper, revealing the NB-CQDs can be applied for anti-counterfeiting. Moreover, the NB-CQDs exhibit negligible cytotoxicity and good biocompatibility, which is favorable for bioimaging applications. And the NB-CQDs were successfully applied for fluorescence imaging in HeLa cells.

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Thermal treatment of hair for the synthesis of sustainable carbon quantum dots and the applications for sensing Hg2+

Cited by 154 publications

References 37 publications

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Hydrothermal synthesis of nitrogen and boron doped carbon quantum dots with yellow-green emission for sensing Cr(vi), anti-counterfeiting and cell imaging

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