Photoluminescence-tunable carbon dots from synergy effect of sulfur doping and water engineering

Gao, Dongwen; Zhang, Yusheng; Liu, Amin; Zhu, Yuda; Chen, Suping; Wei, Dan; Sun, Jing; Guo, Zhenzhen; Fan, Hongsong

doi:10.1016/j.cej.2020.124199

Cited by 99 publications

(45 citation statements)

References 42 publications

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“…Sulphur-doped C-Dots has recently received a great deal of publicity, as sulphur atoms can also provide a new level of energy or to control the initial bandgap of C-Dots (Naik et al, 2018). Gao et al have synthesized multiple colour emissive C-Dots from green, yellow to red by doping sulphur (S) elements and water in a solvothermal method (Gao et al, 2020) by using o-phenylenediamine and N-dimethylformamide (DMF) as the carbon precursor. Thiourea was added as the S doping to the C-Dots.…”

Section: Heteroatom Dopingmentioning

confidence: 99%

A Review on Multifunctional Carbon-Dots Synthesized From Biomass Waste: Design/ Fabrication, Characterization and Applications

et al. 2021

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Carbon-Dots (C-Dots) have drawn much attention in recent years owing to their remarkable properties such as high biocompatibility, low toxicity, nano-scale size, and ease of modification with good tuneable photoluminescence performance. These unique properties have led C-Dots to become a promising platform for bioimaging, metal ion sensing and an antibacterial agent. C-Dots can be prepared using the top-down and bottom-up approaches, in which the latter method is commonly used for large scale and low-cost synthesis. C-Dots can be synthesized using sustainable raw materials or green biomass since it is environmentally friendly, in-expensive and most importantly, promotes the minimization of waste production. However, using biomass waste to produce high-quality C-Dots is still a matter of concern waiting for resolution, and this will be the main focus of this review. Fundamental understanding of C-Dots such as structure analysis, physical and chemical properties of C-Dots, various synthesis methodology and type of raw materials used are also discussed and correlated comprehensively. Additionally, factors affecting the bandgap of the C-Dots and the strategies to overcome these shortcomings are also covered. Moreover, formation mechanism of C-Dots focusing on the hydrothermal method, option and challenges to scale up the C-Dots production are explored. It is expected that the great potential of producing C-Dots from agricultural waste a key benefit in view of their versatility in a wide range of applications.

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Section: Heteroatom Dopingmentioning

confidence: 99%

A Review on Multifunctional Carbon-Dots Synthesized From Biomass Waste: Design/ Fabrication, Characterization and Applications

et al. 2021

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“…As shown in Figure d, the two GQDs contain abundant similar functional structures such as O–H/N–H (3100–3600 cm –1 ), C–H (2940 cm –1 ), and CO/C–N (1649 cm –1 ) . In addition, the bending vibrations of C–N (1360 cm –1 ) and C–O (1130 cm –1 ) are also observed in G-GQDs and R-GQDs . It is worth noting that the stretching vibration of C–N and CC bands for R-GQDs was obviously stronger than that of G-GQDs, suggesting that the R-GQDs possess a higher amount of graphitic N .…”

Section: Resultsmentioning

confidence: 79%

“…39 In addition, the bending vibrations of C−N (1360 cm −1 ) and C−O (1130 cm −1 ) are also observed in G-GQDs and R-GQDs. 40 It is worth noting that the stretching vibration of C−N and CC bands for R-GQDs was obviously stronger than that of G-GQDs, suggesting that the R-GQDs possess a higher amount of graphitic N. 40 In addition, the weaker stretching vibrations of the C−H band and stronger bending vibrations of the CO/CN band indicate a higher degree of oxidation of R-GQDs. Furthermore, a new and strong stretching vibration of C−S−C at around 1193 cm −1 emerged in the FTIR spectrum of R-GQDs, 41 proving the successful introduction of sulfur element in R-GQDs.…”

Section: Resultsmentioning

confidence: 99%

Multicolor Graphene Quantum Dots via Solvatochromic Tuning and Sulfur Doping for Light-Emitting Diodes

Yang

Wang

Tang

et al. 2021

ACS Appl. Nano Mater.

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Recently, graphene quantum dots (GQDs) with polychrome emission capability have attracted much attention due to their multifarious applications. In this study, we report a facile and green approach for rapid preparation of multicolor emission GQDs. Experimentally, UV light was used to drive the lowtemperature synthesis, and a tunable emission wavelength of the GQDs was achieved through the synergistic effect of solvatochromic tuning and sulfur doping. Results show that multicolor emission wavelengths of green-GQDs (G-GQDs) from blue to yellow are obtained by simply controlling the polarity of the surrounding solutions. Moreover, red-GQDs with the emission wavelengths extended from green to red are further obtained by sulfur doping. Thereafter, G-GQDs were used to develop a trace water-detecting platform, ascribed to the high sensitivity of water-quenchable fluorescence, and a low detection limit of 0.061% was achieved. Meanwhile, based on the outstanding multicolor tunability of as-prepared GQDs, we successfully manufactured multicolor solid fluorescence films to fabricate multicolor light-emitting diode (LED) devices. Furthermore, high-quality white LEDs (WLEDs) are fabricated with the CIE coordinates of (0.341, 0.354) and a color temperature of 5161 K. This study highlights the potential of GQDs in various applications, including solid-state fluorescence films, optoelectronics, and optical molecular sensing.

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“…FTIR analysis was performed to reveal information about the surface functional groups of AA-CPDs. The FTIR spectrum of AA-CPDs shown in Figure 2d exhibits that a strong and wide peak across the range of 3500-2500 cm −1 indicates the presence of polymerized carboxyl [36] functional groups on the surface of AA-CPDs. The peaks at 2850 cm −1 and 1760 cm −1 are the stretching vibrations of C-H [37] and C=O [38], respectively.…”

Section: Characterization Of Aa-cpdsmentioning

confidence: 99%

Self-Matrix N-Doped Room Temperature Phosphorescent Carbon Dots Triggered by Visible and Ultraviolet Light Dual Modes

Wang

AL-Zubi

et al. 2022

Nanomaterials

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The synthesis of room temperature phosphorescent carbon dots (RTP-CDs) without any matrix is important in various applications. In particular, RTP-CDs with dual modes of excitation are more interesting. Here, we successfully synthesized matrix-free carbonized polymer dots (CPDs) that can generate green RTP under visible and ultraviolet light dual-mode excitation. Using acrylic acid (AA) and ammonium oxalate as precursors, a simple one-pot hydrothermal method was selected to prepare AA-CPDs. Here, acrylic acid is easy to polymerize under high temperature and high pressure, which makes AA-CPDs form a dense cross-linked internal structure. Ammonium oxalate as a nitrogen source can form amino groups during the reaction, which reacts with a large number of pendant carboxyl groups on the polymer chains to further form a cross-linked structure. The carboxyl and amino groups on the surface of AA-CPDs are connected by intermolecular hydrogen bonds. These hydrogen bonds can provide space protection (isolation of oxygen) around the AA-CPDs phosphor, which can stably excite the triplet state. This self-matrix structure effectively inhibits the non-radiative transition by blocking the intramolecular motion of CPDs. Under the excitation of WLED and 365 nm ultraviolet light, AA-CPDs exhibit the phosphorescence emission at 464 nm and 476 nm, respectively. The naked-eye observation exceeds 5 s and 10 s, respectively, and the average lifetime at 365 nm excitation wavelength is as long as 412.03 ms. In addition, it successfully proved the potential application of AA-CPDs in image anti-counterfeiting.

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Photoluminescence-tunable carbon dots from synergy effect of sulfur doping and water engineering

Cited by 99 publications

References 42 publications

A Review on Multifunctional Carbon-Dots Synthesized From Biomass Waste: Design/ Fabrication, Characterization and Applications

A Review on Multifunctional Carbon-Dots Synthesized From Biomass Waste: Design/ Fabrication, Characterization and Applications

Multicolor Graphene Quantum Dots via Solvatochromic Tuning and Sulfur Doping for Light-Emitting Diodes

Self-Matrix N-Doped Room Temperature Phosphorescent Carbon Dots Triggered by Visible and Ultraviolet Light Dual Modes

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