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Academic literature on the topic 'Luminescent Carbon Dots'

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Published: 7 September 2023

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Journal articles on the topic "Luminescent Carbon Dots"

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Mancini, Federica, Arianna Menichetti, Lorenzo Degli Esposti, Monica Montesi, Silvia Panseri, Giada Bassi, Marco Montalti, Laura Lazzarini, Alessio Adamiano, and Michele Iafisco. "Fluorescent Carbon Dots from Food Industry By-Products for Cell Imaging." Journal of Functional Biomaterials 14, no. 2 (February 7, 2023): 90. http://dx.doi.org/10.3390/jfb14020090.

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Herein, following a circular economy approach, we present the synthesis of luminescent carbon dots via the thermal treatment of chestnut and peanut shells, which are abundant carbon-rich food industry by-products. As-synthesized carbon dots have excellent water dispersibility thanks to their negative surface groups, good luminescence, and photo-stability. The excitation–emission behaviour as well as the surface functionalization of these carbon dots can be tuned by changing the carbon source (chestnuts or peanuts) and the dispersing medium (water or ammonium hydroxide solution). Preliminary in vitro biological data proved that the samples are not cytotoxic to fibroblasts and can act as luminescent probes for cellular imaging. In addition, these carbon dots have a pH-dependent luminescence and may, therefore, serve as cellular pH sensors. This work paves the way towards the development of more sustainable carbon dot production for biomedical applications.
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Bourlinos, Athanasios B., Radek Zbořil, Jan Petr, Aristides Bakandritsos, Marta Krysmann, and Emmanuel P. Giannelis. "Luminescent Surface Quaternized Carbon Dots." Chemistry of Materials 24, no. 1 (December 23, 2011): 6–8. http://dx.doi.org/10.1021/cm2026637.

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Linehan, Keith, and Hugh Doyle. "Solution reduction synthesis of amine terminated carbon quantum dots." RSC Adv. 4, no. 24 (2014): 12094–97. http://dx.doi.org/10.1039/c3ra47770c.

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Highly luminescent water soluble carbon quantum dots (CQDs) with narrow size distributions have been prepared via a simple room temperature, solution-phase synthesis. The CQDs, stabilised by covalently bound allylamine ligands to minimise surface oxidation, exhibit an excitation wavelength dependent blue luminescence with a quantum yield of 25%.
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Su, Weitao, Yuchan Wang, Weiwei Wu, Haiying Qin, Kaixin Song, Xiwei Huang, Lijie Zhang, and Daqin Chen. "Towards full-colour tunable photoluminescence of monolayer MoS2/carbon quantum dot ultra-thin films." Journal of Materials Chemistry C 5, no. 25 (2017): 6352–58. http://dx.doi.org/10.1039/c7tc01773a.

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Kargbo, Osman, Yan Jin, and Shou-Nian Ding. "Recent Advances in Luminescent Carbon Dots." Current Analytical Chemistry 11, no. 1 (December 19, 2014): 4–21. http://dx.doi.org/10.2174/1573411010666141010160217.

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da Silva Souza, Débora Rosa, Larissa Durães Caminhas, João Paulo de Mesquita, and Fabiano Vargas Pereira. "Luminescent carbon dots obtained from cellulose." Materials Chemistry and Physics 203 (January 2018): 148–55. http://dx.doi.org/10.1016/j.matchemphys.2017.10.001.

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Wang, Fu, Zheng Xie, Hao Zhang, Chun-yan Liu, and Ying-ge Zhang. "Highly Luminescent Organosilane-Functionalized Carbon Dots." Advanced Functional Materials 21, no. 6 (February 25, 2011): 1027–31. http://dx.doi.org/10.1002/adfm.201002279.

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Dong, Yongqiang, Jianhua Cai, Xu You, and Yuwu Chi. "Sensing applications of luminescent carbon based dots." Analyst 140, no. 22 (2015): 7468–86. http://dx.doi.org/10.1039/c5an01487e.

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Carbon based dots (CDs) including carbon quantum dots and graphene quantum dots exhibit unique luminescence properties, such as photoluminescence (PL), chemiluminescence (CL) and electrochemiluminescence (ECL).
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Hoan, Bui Thi, Phuong Dinh Tam, and Vuong-Hung Pham. "Green Synthesis of Highly Luminescent Carbon Quantum Dots from Lemon Juice." Journal of Nanotechnology 2019 (May 2, 2019): 1–9. http://dx.doi.org/10.1155/2019/2852816.

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Highly luminescent carbon dots (C-dots) were synthesized by the one-pot simple hydrothermal method directly from lemon juice using different temperatures, time, aging of precursors, and diluted solvents to control the luminescence of C‐dots. The obtained C-dots were characterized by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrophotometry, dynamic light scattering, ultraviolet-visible spectrophotometry, and photoluminescent spectrophotometry. The results show that C‐dots had strong green light emission with quantum yield in the range of 14.86 to 24.89% as a function of hydrothermal temperatures. Furthermore, light emission that is dependent on hydrothermal time, aging of precursor, and diluted solvent was observed. These results suggest that the C‐dots have potential application in optoelectronics and bioimaging.
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Stan, Loredana, Irina Volf, Corneliu S. Stan, Cristina Albu, Adina Coroaba, Laura E. Ursu, and Marcel Popa. "Intense Blue Photo Emissive Carbon Dots Prepared through Pyrolytic Processing of Ligno-Cellulosic Wastes." Nanomaterials 13, no. 1 (December 27, 2022): 131. http://dx.doi.org/10.3390/nano13010131.

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In this work, Carbon Dots with intense blue photo-luminescent emission were prepared through a pyrolytic processing of forestry ligno-cellulosic waste. The preparation path is simple and straightforward, mainly consisting of drying and fine grinding of the ligno-cellulosic waste followed by thermal exposure and dispersion in water. The prepared Carbon Dots presented characteristic excitation wavelength dependent emission peaks ranging within 438–473 nm and a remarkable 28% quantum yield achieved at 350 nm excitation wavelength. Morpho-structural investigations of the prepared Carbon Dots were performed through EDX, FT-IR, Raman, DLS, XRD, and HR-SEM while absolute PLQY, steady state, and lifetime fluorescence were used to highlight their luminescence properties. Due to the wide availability of this type of ligno-cellulosic waste, an easy processing procedure achieved photo-luminescent properties, and the prepared Carbon Dots could be an interesting approach for various applications ranging from sensors, contrast agents for biology investigations, to photonic conversion mediums in various optoelectronic devices. Additionally, their biocompatibility and waste valorization in new materials might be equally good arguments in their favor, bringing a truly “green” approach.
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Dissertations / Theses on the topic "Luminescent Carbon Dots"

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Soares, Leonardo dos Reis Leano. "Estudo do comportamento de sinais OSL de BeO e Al2O3:C usando o Modelo OTOR Simplificado e Método dos Mínimos Quadrados." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02112018-132426/.

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A dosimetria das radiações alfa, beta e gama é importante para diversas áreas aplicadas, sendo utilizada na proteção radiológica de pacientes e profissionais que se expõem a esses tipos de radiações. Com estudos dosimétricos pode-se obter melhores estimativas de dose absorvida, e ter mais precisão na estimativa de riscos populacionais. As técnicas de Termoluminescência (TL) e Luminescência Oticamente Estimulada (OSL) são utilizadas para essas aplicações dosimétricas. Estudos recentes têm mostrado que alguns materiais dosimétricos conhecidos como óxido de alumínio dopado com carbono (Al$_2$O$_3$:C) e óxido de berílio (BeO) sofrem mudanças no formato observado dos sinais OSL com relação as taxas de dose e tipos de radiação. O principal objetivo desse trabalho foi analisar os formatos dessas curvas e verificar quantitativamente, se existem ou não mudanças nos formatos dos sinais OSL dos dosímetros irradiados com diferentes tipos de radiação e taxas de dose. Sob o modelo de uma armadilha e um centro de recombinação (OTOR) foram estudados os sinais OSL com estímulo contínuo (CW-OSL). O modelo OTOR é simples, mas não possui solução analítica e as soluções computacionais são custosas pelo número grande de variáveis e parâmetros. Nesse trabalho, foi necessário realizar algumas simplificações para obtenção de um modelo ainda mais simples para ajuste nos dados. O modelo OTOR simples apresenta um comportamento de decaimento exponencial na descrição do sinal CW-OSL. Uma outra abordagem de extensão do modelo OTOR-simples foi a utilização do modelo com duas armadilhas independentes e um centro de recombinação, que resulta em dois decaimentos exponenciais. Para obtenção dos parâmetros que descrevem o sinal CW-OSL com esses modelos, foi utilizado o método dos mínimos quadrados (MMQ), com refinamento dos parâmetros pelo método de Gauss. O modelo de dois decaimentos exponenciais mostrou-se superior em qualidade com análise do parâmetro $\\chi^2$ e do comportamento dos resíduos em relação ao modelo de um decaimento exponencial para ambos os materiais utilizados. Com os ajustes, foi possível verificar diferenças nos comportamentos do sinal CW-OSL das amostras irradiadas em diferentes situações. As diferenças observadas nos comportamentos são apresentadas pelos parâmetros de decaimento ou de sinal inicial, ou pelas relações entre esses. Os parâmetros ajustados mostram que os sinais OSL provenientes do Al$_2$O$_3$:C e do BeO irradiados com alfa, beta e gama apresentam diferenças significativas nos comportamentos. As diferenças verificadas pelos ajustes dos sinais CW-OSL apresentados pelos dosímetros irradiados com beta e gama podem ter sido em parte causadas por efeito de fading, que afeta de maneira distinta os formatos das curvas e parâmetros ajustados. Nas irradiações com radiação gama com faixas de doses (de 22 a 122 mGy) e taxas doses absorvidas (de 0.024 a 1.66 Gy/s) não foram observados diferenças significativas nos sinais OSL.
The dosimetry of alpha, beta and gamma radiation is important in various applied areas, it is used in radiation protection of patients and professionals who are exposed at this kind of radiation. With dosimetric studies, it is possible to better estimate the absorbed dose, and population risks. Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) techniques are used for these dosimetric applications. Recent studies have shown that some known dosimetric materials as carbon doped aluminum oxide (Al$_2$O$_3$:C) and berilium oxide (BeO) undergo changes in OSL signal behavior related to dose rates and types of radiation. The main objective of this work was to analise the formats of these curves and quantitatively verify whether or not there are changes in OSL signal of the dosimeters irradiated with different types of radiation and dose rates. Under the model of one trap one recombination center (OTOR) the continuous wave OSL (CW-OSL) signals were studied. The OTOR model is the simplest model, but has no analytical solution and the computational solutions are costly by the large number of variables and parameters. In this work, it was necessary to make some simplifications in order to obtain a simple model that could be fitted to the data. The simple-OTOR model shows an exponential decay behavior in the CW-OSL signal description. Another extension approach to the simple-OTOR model was the model with two independent traps and one recombination center, that results in two exponential decays. To obtain the parameters that describe the CW-OSL signal with these models, the least square method (LSM) was used, with parameter refinement by Gauss method. For both the materials the two exponential decay model proved to be superior in quality to the one exponential decay by the analysis of the parameter $\\chi^2$ and the behavior of the residuals. With the fittings, it was possible to verify differences in the behavior of the CW-OSL signal of the samples irradiated in different situations. These differences observed are presented in the decay or initial signal parameters, or in their ratios. Fitted parameters show that OSL signals from Al$_2$O$_3$:C and BeO irradiated with alpha, beta and gamma exhibit significant differences in behavior. The differences verified by the fittings of the CW-OSL signals presented by beta and gamma irradiated dosimeters may in part have been caused by fading effect, which affects in a different way the shapes of the curves and fitted parameters. Gamma irradiation with dose and absorbed dose rate ranges from 22 to 122 mGy and from 0.024 to 1.66Gy/s respectively did not produce significant differences in OSL signals.
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Das, Rahul Kumar. "Luminescent Heteroatom doped Carbon Quantum Dots for Sensing and Drug Delivery Applications." Thesis, 2019. http://ethesis.nitrkl.ac.in/10041/1/2019_PhD_RDas_513CY6080_Luminescent.pdf.

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The present dissertation entitled, “Luminescent Heteroatom doped Carbon Quantum Dots for Sensing and Drug Delivery Applications” is an embodiment of the investigations aimed at developing simple inexpensive synthetic methodologies for producing heteroatom doped carbon quantum dots pertinent for sensing and biomedical application. The diagnostic and therapeutic applications of these multifunctional nanomaterials have been studied in vitro. The thesis has been divided into seven chapters. Hydrophilic boronic acid modified nitrogen sulphur doped carbon quantum dots (BNSCQD) have been prepared following a cost effective hydrothermal approach. The co-doping is aimed to improve the luminescence as well as targeting affinity of the CQD. Due to intense fluorescence property, appreciable photostability, boronic acid functionality and low cytotoxicity the carbon quantum dots (CQD) have been utilised in sensing glucosamine and cancer cell receptor Sialyl Lewisa (SLa). This method is highly sensitive and selective for visual detection of glucosamine sensing using a paper based sensor strip. Furthermore, integration of dopamine with BNSCQD (BNSCQD-Dopa) sets a platform for development of a fluorescence turn-on nanoprobe for fluoride detection in real samples. Due to boron’s affinity towards fluorine, the system was very selective towards fluoride when compared with other anions with a detection limit 0.7 pM. The practical ultrasensitive utility of the sensor is well demonstrated in human serum samples and also extended for fluoride detection in cellular environment. Further, the BNSCQD has been integrated with gadolinium iron oxide and mesoporous silica to construct a theranostic nanoparticle where BNSCQD imparts multiple functions such as simultaneous pH-sensitive gate opening, leading to control drug release, optical imaging, and receptor targeted internalization of the theranostic particle. The drug release experiment under variable pH and in the presence of competitive binding ligand SLa clearly shows the excellent responsiveness of the BNSCQD capped MSN hybrid system toward dual stimuli. Because of reasonably good r1 r2 relaxivities of the magnetic core and excellent fluorescence property of the doped carbon quantum dot, the hybrid can be utilized to monitor the therapeutic response through MRI and/or fluorescence imaging. Nitrogen doped mesoporous hollow carbon nanospheres (NCQD-HCS) have been prepared by inert calcination of polymer synthesized using pyrrole, aniline and Triton X-100 as molecular precursors. Here a direct synthetic approach is followed to yield high surface area carbon spheres with fluorescence property. An optimization of both surface area and photoluminescence is achieved by tuning temperature of calcination. The highest PL quantum yield of 14.6% is recorded, which is suitable for confocal imaging of cells. The fluorescence property of these spheres is attributed to the embedded nitrogen doped carbon quantum dots (NCQD) in carbon matrix. The photothermal property of NCQD-HCS has been investigated under 980 nm NIR irradiation. Cell killing efficacy of hollow spheres by photothermal ablation effect is evaluated in FaDu cells (oral cancer) as a modal cell line. Similarly, the upconversion property of carbon spheres is explored for light responsive drug release of gemcitabine. A highly biocompatible click chemistry based gating system is designed to restrict the premature release of drug molecules from porous nanospheres. The utilization of upconverted radiation by substituted nitrobenzyl linker, initiating its cleavage followed by drug release under periodic irradiation (980 nm laser) intervals has been tested in vitro. These fluorescent multifunctional nanoparticles provide a platform for combinatorial therapy of oral cancer.
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Paikaray, Sonali. "A Simple Hydrothermal Synthesis of Luminescent Carbon Quantum Dots from Different Molecular Precursors." Thesis, 2013. http://ethesis.nitrkl.ac.in/4627/1/411CY2027.pdf.

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In this work,highly photoluminescent C-dots have been synthesised from different precursors such as sucrose, ascorbic acid, citric acid and their combinations under similar conditions to that of recently reported synthesis of C-dots from orange juice.The synthesized carbon nanoparticles have been characterized by XRD, FTIR, UV, and fluorescence measurements. The fluorescence quantum yields of carbon dots synthesized from different precursors have been compared to verify the suitability of C-dots for different applications. We have also thoroughly investigated the effect of excitation wavelength, pH, and electrolyte concentration on luminescent properties.
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Jiang, Zh-Cheng, and 姜智程. "Solution-processed, Eco-friendly Carbon Dots for Light-emitting Thin Films and Luminescent Solar Concentrators." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/45139329502181400760.

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碩士
中原大學
物理研究所
104
Solution-processed carbon dots (CDs) have attracted much attention owing to their superior materials and photoluminescence (PL) properties, such as abundant precursor materials, less toxicity, high photo-stability and tunable emission. However, their PL properties, including PL quantum yields and photo-stability would be significantly degraded due to concentration-induced solid-state quenching and unstable surface. In this thesis, we fabricated high quality CDs/polyvinyl alcohol (PVA) light-emitting flexible films with submicron structure patterns by a facile and low cost method. PVA is chosen as the host matrix to both disperse and passivate CDs, leading to enhanced internal quantum yields (69%) in the solid states. Patterned CDs/PVA composite can be used to extract the trapped light, thus mitigate the waveguide-mode losses, approximately doubling the external light extraction efficiency. Such CDs/PVA composites also exhibit good photo-stability, and can be used as eco-friendly, low cost phosphors for solid-state lighting. On the other hand, those CDs can also be utilized as eco-friendly luminophores for promising applications in luminescent solar concentrators (LSCs). Such LSCs can be used to concentrate the solar light to enhance the efficiency and reduce the material costs of solar cells. We have fabricated flexible LCSs based on hydrophobic CDs doped PDMS waveguide and characterize their performances using spectroscopic methods. We found that those hydrophobic CDs can be uniformly dispersed into PDMS waveguide and exhibit good photo-stability. The key metric of LSCs, namely, reabsorption losses, has also been investigated using excitation-position-dependent PL spectroscopy. Our demonstration can pave a way to further design efficient LSCs based on eco-friendly CDs in the future.
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Chang, Li-Yun, and 張力云. "Investigation of photophysical properties of carbon quantum dots and their application in luminescent solar concentrators." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/vp7y56.

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碩士
中原大學
物理研究所
106
Novel solar windows can be realized by integrating conventional solar cells and transparent luminescent solar concentrators (LSCs). Recently, efficient LSCs have been demonstrated based on colloidal quantum dots (CQDs) due to their unique photophysical properties. Unfortunately, most of matured CQDs contain toxic heavy-metal elements and need to be synthesized in the hazardous organic solvent. It would be beneficial to replace conventional heavy-metal CQDs with eco-friendly nano-materials, while preserving unique photophysical properties. Carbon nano-dots (CNDs) are newly emerged luminescent nano-materials that can be simply synthesized using hydrothermal method based on cost-effective, earth-abundant precursors. The main challenge for CNDs utilized in the solid state is concentration-induced self-quenching, thus need to be addressed for the LSC applications. 　　In this thesis, the effect of solid matrices on the photophysical properties of CNDs were investigated, which is necessary for preparing efficient LSCs. We found that the excited-state dynamics can be modified by the solid matrices, thus influencing the PL quantum yields (PL-QYs). In addition, the uniformity of solid-state thin films can be also affected by the solid matrices. We also demonstrated that the CNDs can be uniformly dispersed in a PVA solid matrix and hold high solid-stat PL-QYs up to ~50%. Motivated by such fascinating properties, greener LSCs with a geometric gain of ~ 10 were fabricated based on CNDs/PVA nano-composites, which exhibit internal quantum efficiency of 30% and stable PL emission.
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Tsai, Yi-Wen, and 蔡依雯. "Synthesis of heteroatom-doped carbon dots with tunable luminescence properties for bioimaging and free radical scavenging." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/yg29wt.

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碩士
國立臺灣科技大學
化學工程系
107
Herein, we combined with nano-synthesis technology and biomedical applications. We present an aqueous based facile microwave-assisted synthesis of carbon quantum dots, which has short synthesis time, low toxicity, water dispersibility and biocompatibility. These advantages are beneficial for biological application. The red, yellow, green and blue fluorescent carbon dots were successfully synthesized by adjusting the heteroatomic doping and changing the purification method. Furthermore, we applied these carbon dots for in vitro antioxidant activity and bioimaging. Part Ⅰ: Antioxidant activity of phosphorous and manganese element co-doped red magnetofluorescent carbon dots P-phenylenediamine was used as carbon precursor. Doping phosphorous (P) heteroatom into Cdots could enhance the quantum yield. Furthermore, doping manganese (Mn) could impart magnetic property to carbon dots. The red fluorescent carbon dots were successfully synthesized by one-pot microwave method. In this study, the application of antioxidant property for PMn@Cdots was carried out by using DPPH, •OH and O2-•, respectively. The result was compared with ascorbic acid and it showed that PMn@Cdots also have good antioxidant property. Furthermore, in the protective activity result of H2O2-induced cell death model, it was found that PMn@Cdots-HA could reduce intracellular ROS levels and protect cells from oxidative stress.
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WU, Yao-Hsuan, and 巫耀玄. "Studies of photophysical properties of solid-state carbon nano-dot thin films for greener luminescent solar concentrators." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/nx66pf.

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碩士
中原大學
奈米科技碩士學位學程
106
A luminescent solar concentrator (LSC) is consisted of the luminophores and a waveguide that can be used to spatially concentrate both direct and diffused sunlight without the need of complex and expensive solar-tracking and cooling systems. Recently, colloidal quantum dots (CQDs) with some unique photophysical properties have attracted much attention as the luminophores in LSCs. However, most of mature CQDs contain heavy metals and need to be synthesized in the hazardous organic solvent. In addition, they also suffered from concentration-induced quenching (CIQ), thus the loading concentration of luminophores doped in LSCs is restricted. Unfortunately, this would reduce the light-absorbing efficiency, leading to large transmission losses. To address all the issues mentioned previously, organosilane-functionalized carbon nanodots (Si-CNDs) were synthesized based on cost-effective, earth-abundant precursors using a simple hydrothermal method. Such Si-CNDs exhibit some unique photophysical properties, including large absorption coefficient, high PL quantum yields (PL-QYs) and resistance to CIQ effect. Due to good film-forming properties, greener LSCs with different loading concentrations can be simply fabricated by directly cross-linking Si-CNDs on the glass waveguide. The LSCs are highly transparent even under high loading concentration up to 75 wt%, indicating high uniformity of Si-CND distribution. The LSCs with 25 wt% loading contents still possess high solid-state PL-QYs up to ~41% upon the calibration of reabsorption losses and high internal quantum efficiency of ~23% due to low scattering losses. We expect our demonstration can pave a way to further design efficient greener LSCs after further reducing the reabsorption losses.
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Book chapters on the topic "Luminescent Carbon Dots"

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Medeiros Borsagli, Fernanda G. L., and Alessandro Borsagli. "Luminescent Carbon Dots for Environmental Photocatalytic." In Inorganic-Organic Composites for Water and Wastewater Treatment, 201–28. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5928-7_6.

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Dutta Choudhury, Sharmistha. "Synthesis, Properties and Applications of Luminescent Carbon Dots." In Handbook on Synthesis Strategies for Advanced Materials, 421–60. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1892-5_11.

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Dong, Yongqiang, Jianhua Cai, and Yuwu Chi. "Carbon Based Dots and Their Luminescent Properties and Analytical Applications." In Carbon Nanoparticles and Nanostructures, 161–238. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28782-9_6.

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Yang, Shihe, and Yongfu Qiu. "Carbon Quantum Dot Luminescent Materials." In Materials and Interfaces for Clean Energy, 91–116. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003142232-4.

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Kumar, Munish. "Synthesis of Carbonaceous Quantum Dots." In Carbonaceous Quantum Dots: Synthesis And Applications, 20–37. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136265123010005.

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New class of nanocarbon materials, such as luminescent carbon quantum dots (CQDs) has gained a great deal of interest in the area of electrocatalysis, solar cells, bioimaging nanomedicine, a chemical sensor and a light-emitting diode. CQDs exhibit good physio-chemical properties, such as photoluminescence, high crystallization and good dispersibility. The rapid electron transfer, small size and superconductivity of CQDs provide the CQDs-based composite offering enhanced catalytic activity and electric conductivity. However, additional active moieties are present on the surface, which might aid in the formation of multi-component electrically activated catalysts. Additionally, the multi-component catalysts' internal interactions promote charge transfer and catalytic efficiency, both of which are essential for electrochemistry. Therefore, keeping in mind the importance of CQDs, they are synthesized on the basis of two approaches: Top-down and Bottom-up. The bulk material is reduced in size by utilizing chemical and physical processes in the top-down approach. On the contrary, in the bottom-up method, the atoms are assembled and converted into CQDs using polymerization and carbonization through a chemical reaction. Hence, in this chapter, we will discuss the synthesis techniques for CQDs, such as hydrothermal/solvothermal method, laser ablation, arc-discharge method, acidic oxidation, thermal/combustion routes, electrochemical method and microwave pyrolysis method.
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Gavilán, H. "Nanomaterials and their Synthesis for a Sustainable Future." In Materials Research Foundations, 233–310. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902639-8.

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Nanomaterials are structured materials whose dimensions lie in the nanoscale, at least in one dimension. Their small size and high surface area lead to properties not observed in their bulky state, some of which have revolutionized different fields in the last decades. While it is acknowledged that nanomaterials have been obtained or created since ancient times, with little or no knowledge about nanotechnology itself, it was not until this century that the development of nanomaterials was done on purpose, achieving a high level of sophistication in terms of fine-tuning the nanomaterial’s properties, including size, shape, chemical composition, and structure. As such, nanomaterials are used in many industries as advanced materials with high strength while being light, superhydrophobicity, and antimicrobial properties, to name a few. Some of the nanomaterials with high value, given their outstanding properties, are quantum dots (superior luminescence properties), gold nanoparticles (localized surface plasmons), layered perovskites (optimal band gaps for materials like solar cells), and carbon nanotubes (very high tensile strength, electrical conductivity). Consequently, there has been a tremendous boom of nanomaterials in the industry, so they have been introduced into our daily lives. Despite the little knowledge available about their impact on the environment and our health, such intensified use has raised some concerns about the safe use of nanomaterials. Furthermore, due to the extended use of resources and current pollution levels, given that access to energy, food, clean water, and health is not guaranteed to future generations, the concept of “sustainability” and the transition from a linear to a circular economy is becoming more important in the manufacturing of products. As a result, society is making efforts to implement the 3Rs ‘reduce’, ‘reduce’, and ‘recycle’ in our community. In addition, other Rs are of utmost importance: ‘Recover’, ‘Redesign’, ‘Remanufacture’, etc., so that products, materials, and resources are maintained in the economy for as long as possible, and the generation of waste is minimized. This book chapter tackles all these aspects for nanomaterials and “nano-products” (nanomaterials already introduced in specific markets or industries). In particular, it analyzes and collects data available in the literature, where it was possible to implement the sustainability concept in different steps of the life-cycle of nanomaterials: from their synthesis to subsequent remanufacturing processes. In this line, this chapter discusses the ‘green’ synthesis of nanomaterials, which are environmentally friendly processes that take place in natural environments (i.e., processes where nanoparticles are produced by microorganisms), or techniques that eliminate toxic reagents, minimize waste, reduce energy consumption and use ecological solvents. In addition, a section of the chapter covers reported strategies where the recovery, reuse, and recycling of nanomaterials were successful. The chapter has been structured into five parts. First, a general introduction to nanomaterials is provided. Then, different green synthesis methods are described, focusing on the biosynthesis of metal/metal-based oxide nanoparticles. After, the definition and classification of nanowastes are given, as well as a general overview of nano-toxicity and the different management procedures applied to nanomaterials after their end-of-life. Then, the book chapter covers the reuse and recycling of nanomaterials. In the fourth section of the book chapter, we provide data on ‘safe- and sustainable-by-design’ (SSbD) synthesis methods of nanomaterials. SSbD is a key concept for implementing a circular economy on nanomaterials. Finally, we provide some conclusions and final remarks about nanomaterials and their synthesis for a sustainable future.
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Conference papers on the topic "Luminescent Carbon Dots"

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Mathew, Sheril Ann, P. Praveena, Y. Sruthi Hubert, V. Narayanan, and A. Stephen. "Luminescent carbon dots/chitosan nanocomposite for bioimaging." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5112991.

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Kumar, S. Ajeesh, and Cyriac Joseph. "High intense blue-violet luminescent carbon dots derived from camphor soot." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5130267.

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Roza, Liszulfah, Permono Adi Putro, and Isnaeni. "Ultrasonic-assisted melt blending for polyvinyl alcohol/carbon dots luminescent flexible films." In THE 8TH NATIONAL PHYSICS SEMINAR 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5132686.

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Perez-Guzman, M. A., R. Ortega-Amaya, and M. Ortega Lopez. "Advances on synthesis of highly luminescent carbon quantum dots by citric acid carbonization." In 2017 14th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE). IEEE, 2017. http://dx.doi.org/10.1109/iceee.2017.8108911.

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Hagiwara, Kenta, and Satoshi Horikoshi. "Rapid Synthesis of highly luminescent Carbon Quantum Dots using Low-Pressurized Microwave Solvothermal Heating." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9784.

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Since the first serendipity of carbon quantum dots (CQDs)1, it is expected to be used for imaging materials for reusable living bodies (e.g. Hela cells). However, the reported CQDs synthetic methods have yet to be at the practical levels; the quantum yields is low, and synthetic condition is over 5 hrs under more than 30 atms. In this research, we ameliorated the problems of CQDs synthesis and luminescence (quantum yields) by the novel synthesis protocol using microwave chemistry. Specifically, we synthesized high quantum yields CQDs (61%) by utilizing a microwave chemical synthesis, synthesizing at low pressure condition (lower than 5 atom) and short reaction time (3 hrs). The achievement of this high quantum yields made it clear that the contribution of polyethylene glycol (PEG) shell to CQDs is large. It was confirmed from the DLS and TEM image that the particle size of the synthesized particles was 8 to 13 nm (Fig. 1). On the other hand, the relationship between the polymerization degree of added PEG and the quantum yields to the addition amount is summarized in Table 1. The quantum yields of CQDs without addition of PEG was 16.7 %, while it was improved at 61.1 % when 0.6 g of PEG6000 (Molecular weight: 6000) was added.We succeeded in remarkably improving the quantum yields by using PEG, which is usually used as a protective agent, as a shell. By using this method, we succeeded in improving the quantum yields of the existing report by approximately 3 times. From the surface modified structure of PEG, the mechanism of improvement of quantum yields will be considered.[1] X. Xu et al., J. Am. Chem. Soc., 2004, 126, 12736–12737.
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Tyutrin, A. A., R. Wang, and E. F. Martynovich. "Fluorescent carbon quantum dots formed from glucose solution by microplasma treatment." In Luminescence and Laser Physics: XVII International Conference on Luminescence and Laser Physics – LLPh 2019. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0061798.

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Kapitonov, A. N., M. N. Egorova, A. E. Tomskaya, S. A. Smagulova, and A. A. Alekseev. "Hydrothermal synthesis of carbon dots and their luminescence." In 6TH INTERNATIONAL CONFERENCE ON PRODUCTION, ENERGY AND RELIABILITY 2018: World Engineering Science & Technology Congress (ESTCON). Author(s), 2018. http://dx.doi.org/10.1063/1.5079363.

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Arabzadeh Nosratabad, Neda, Zhicheng Jin, Liang Du, and Hedi Mattoussi. "N-Heterocyclic carbene-stabilized gold nanoparticles and luminescent quantum dots." In Colloidal Nanoparticles for Biomedical Applications XVII, edited by Marek Osiński and Antonios G. Kanaras. SPIE, 2022. http://dx.doi.org/10.1117/12.2610485.

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Zhang, Xueqiao, Ye Liu, Sanjida Yeasmin, Ahasan Ullah, and Li-Jing Cheng. "Red Emissive Carbon Dots with a Large Stokes Shift for Color-Conversion LEDs." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.jw2a.69.

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We present new red emissive carbon dots with 219 nm Stokes shift and 45.2% quantum yield. The photoluminescence mechanism for the large Stokes shift was proposed. Printable luminescence patterns and color-conversion LEDs were demonstrated.
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Onishi, Bruno Seiki Domingos, Ricardo Bortoletto-Santos, Elias Paiva Ferreira Neto, and Sidney José Lima Ribeiro. "Development of hybrid organic-inorganic coating based on carbon dots on bacterial cellulose using sol-gel route." In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.m3c.5.

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The luminescence quenching by aggregation of carbon dots (CD) could be solved by functionalizing the surface with an alkoxysilane, bounding the nanoparticle directly in the polymer network.The reaction was monitored with ATR-FTIR and bacterial cellulose (BC) was coated with the precursor using sol-gel route, showing blue luminescence of CD.
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Reports on the topic "Luminescent Carbon Dots"

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Ibrayev, Niyazbek, Evgeniya Seliverstova, and Gulnur Amanzholova. Plasmon-enhanced luminescence of S,N-doped carbon dots. Peeref, July 2023. http://dx.doi.org/10.54985/peeref.2307p7089502.

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