Bright carbon dots as fluorescence sensing agents for bacteria and curcumin

Baig, Mirza Muhammad Fahad; Chen, Yu-Chie

doi:10.1016/j.jcis.2017.04.045

Cited by 111 publications

(41 citation statements)

References 66 publications

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“…The lattice fringe distance is observed at 0.317 nm which is attributed to the plane (002) spacing of carbon. [26][27][28] Diameter size distribution of c-CDs is illustrated in the Figure 8, they are in the range 1-10 nm and 60% of them with diameter of 2-4 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, from the image Figure b, the HRTEM result suggests that the c‐CDs have highly crystalline carbon structure. The lattice fringe distance is observed at 0.317 nm which is attributed to the plane (002) spacing of carbon . Diameter size distribution of c‐CDs is illustrated in the Figure , they are in the range 1–10 nm and 60% of them with diameter of 2–4 nm.…”

Section: Introductionmentioning

confidence: 92%

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A Facile, Effective Synthesis of Excellent Fluorescent Carbon Dots with Optical Properties

Shen

Wang

2019

ChemistrySelect

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Carbon dots (CDs) are new fluorescent materials which have been sparked intense research due to their excellent properties, such as ultraviolet (UV) absorption, good biocompatibility, low toxicity, facile synthesis, low cost and tunable photoluminescence. Therefore, CDs appear to be a promising nanomaterials in many fields of application. Here, high quality carbon dots (named a‐CDs, b‐CDs, c‐CDs) were synthesized through a mild, facile hydrothermal method without any further modification using different carbon precursors and surfactants. Through carefully comparing and analyzing the three as‐prepared CDs samples, the c‐CDs exhibited exceptional advantages including high fluorescence intensity and satisfactory chemical stability. Then, the structures, morphologies, optical properties were characterized by X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), UV–vis and fluorescence spectroscopic, Raman spectra and transmission electron microscope (TEM) in details. Our results verified that one‐step hydrothermal synthesis was a simple, efficient and green process for the preparation of carbon dots. The investigation on the unique characteristics can provide new recognition on the fluorescent carbon dots.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

A Facile, Effective Synthesis of Excellent Fluorescent Carbon Dots with Optical Properties

Shen

Wang

2019

ChemistrySelect

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“…So far, multiple methods have been reported for synthesizing CQDs that have resulted in dots with biological properties in bacterial cells [33][34][35][36][37]. However, in most of the studies, the location of these CQDs remained obscure.…”

Section: Introductionmentioning

confidence: 99%

“…However, cell aggregation hindered the imaging and made the single cells and cell structures unclear. Baig et al developed an inexpensive chicken protein-based method that could generate carbon dots via a one-step heating reaction [37]. These dots could be used as green markers of E. coli and red markers of Staphylococcus aureus (emission wavelengths of 450-490 nm and 510-560 nm, respectively) but only on intact cells.…”

Section: Introductionmentioning

confidence: 99%

Polyethylene Glycol6000/carbon Nanodots as Fluorescent Bioimaging Agents

Chien

et al. 2020

Nanomaterials

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Photoluminescent nanomaterials have immense potential for use in biological systems due to their excellent fluorescent properties and small size. Traditional semiconductor quantum dots are heavy-metal-based and can be highly toxic to living organisms, besides their poor photostability and low biocompatibility. Nano-sized carbon quantum dots and their surface-modified counterparts have shown improved characteristics for imaging purposes. We used 1,3, 6-trinitropyrene (TNP) and polyethylene glycol6000 (PEG6000) in a hydrothermal method to prepare functional polyethylene glycol6000/carbon nanodots (PEG6000/CDs) and analyzed their potential in fluorescent staining of different types of bacteria. Our results demonstrated that PEG6000/CDs stained the cell pole and septa of gram-positive bacteria B. Subtilis and B. thuringiensis but not those of gram-negative bacteria. The optimal concentration of these composite nanodots was approximately 100 ppm and exposure times varied across different bacteria. The PEG6000/CD composite had better photostability and higher resistance to photobleaching than the commercially available FM4-64. They could emit two wavelengths (red and green) when exposed to two different wavelengths. Therefore, they may be applicable as bioimaging molecules. They can also be used for differentiating different types of bacteria owing to their ability to differentially stain gram-positive and gram-negative bacteria.

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“…They are composed of sp 2 =sp 3 -hybridized carbon atoms, have various surface functional groups, and possess composition-dependent fluorescence. This relatively new material has attracted huge interest in many fields including, but not limited to, electrocatalysis [6], biosensing [7][8][9][10], bioimaging [11][12][13][14], chemical sensing [15], and nanomedicine [16], due to their unique tunable photoluminescence (PL) properties, chemical inertness, high water solubility, ease and low cost of fabrication and, more importantly, low toxicity. Additionally, CQDs have also attracted considerable interest in various photocatalytic applications-environmental remediation [17][18][19][20][21], water splitting to produce H 2 production [22][23][24][25][26][27], CO 2 conversion [28][29][30], and synthesis of chemicals [28][29][30][31][32][33]-because when coupled with a semiconductor photocatalyst, CQDs can provide with several advantages, including improved light harvesting ability, efficient usage of the full spectrum of sunlight, efficient charge carrier separation, stability, and hinder charge recombination.…”

Section: Introductionmentioning

confidence: 99%

CQD-Based Composites as Visible-Light Active Photocatalysts for Purification of Water

Makama¹,

Umar²,

AbdulkadirSaidu³

2018

Visible-Light Photocatalysis of Carbon-Based Materials

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The unique physicochemical properties of carbon quantum dot-(CQD)-based photocatalysts, notably their exceptionally good light absorption in the UV and near-visible region, tunable photoluminescence, extraordinary upconversion photoluminescence, outstanding electron affinity, and photoinduced electron transfer, and electron mobility, have attracted considerable attention in different photocatalytic applications. In this review, we summarized the fundamental mechanism and thermodynamics of heterogeneous photocatalysis of aqueous pollutants and the fundamental multifaceted roles of CQDs in photoredox process. Furthermore, we discussed the recent developments in the use of CQD-based materials as visiblelight active photocatalysts in water purification. Finally, the challenges and future direction of CQD-based materials as photocatalytic materials for environmental decontamination were highlighted.

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Bright carbon dots as fluorescence sensing agents for bacteria and curcumin

Cited by 111 publications

References 66 publications

A Facile, Effective Synthesis of Excellent Fluorescent Carbon Dots with Optical Properties

A Facile, Effective Synthesis of Excellent Fluorescent Carbon Dots with Optical Properties

Polyethylene Glycol6000/carbon Nanodots as Fluorescent Bioimaging Agents

CQD-Based Composites as Visible-Light Active Photocatalysts for Purification of Water

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