Photoluminescent lignin hybridized carbon quantum dots composites for bioimaging applications

Xue, Bai-Liang; Yang, Yang; Sun, Yongchang; Fan, Junjun; Li, Xinping; Zhang, Zhao

doi:10.1016/j.ijbiomac.2018.11.018

Cited by 110 publications

(60 citation statements)

References 38 publications

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“…This indicates that, in the PL spectrum of our CQDs, there appears an excitation wavelength-dependent feature. The previous study also found similar results [43,45]. Figure 4 shows the optical images of the prepared CQDs under daylight (a) and UV light (c).…”

Section: Optical Performance Of the Prepared Cqdssupporting

confidence: 79%

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Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Zhang

Pan

et al. 2019

Materials

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In this study, the low-cost processing residue of Radiata pine (Pinus radiata D. Don) was used as the lone carbon source for synthesis of CQDs (Carbon quantum dots) with a QY (The quantum yield of the CQDs) of 1.60%. The CQDs were obtained by the hydrothermal method, and +a PVA-based biofilm was prepared by the fluidized drying method. The effects of CQDs and CNF (cellulose nanofibers) content on the morphology, optical, mechanical, water-resistance, and wettability properties of the PVA/CQDs and PVA/CNF/CQDs films are discussed. The results revealed that, when the excitation wavelength was increased from 340 to 390 nm, the emission peak became slightly red-shifted, which was induced by the condensation between CQDs and PVA. The PVA composite films showed an increase in fluorescence intensity with the addition of the CNF and CQDs to polymers. The chemical structure of prepared films was determined by the FTIR spectroscopy, and no new chemical bonds were formed. In addition, the UV transmittance was inversely proportional to the change of CQDs content, which indicated that CQDs improved the UV barrier properties of the films. Furthermore, embedding CQDs Nano-materials and CNF into the PVA matrix improved the mechanical behavior of the Nano-composite. Tensile modulus and strength at break increased significantly with increasing the concentration of CQDs Nano-materials inside the Nano-composite, which was due to the increased in the density of crosslinking behavior. With the increase of CQDs content (>1 mL), the water absorption and surface contact angle of the prepared films decreased gradually, and the water-resistance and surface wettability of the films were improved. Therefore, PVA/CNF/CQDs bio-nanocomposite films could be used to prepare anti-counterfeiting, high-transparency, and ultraviolet-resistant composites, which have potential applications in ecological packaging materials. IntroductionPolyvinyl alcohol (PVA) is a kind of semi-crystalline polymer with a linear structure and strong hydrogen bonds intermolecular. It has been widely used in papermaking [1], textiles [2], coatings [3], adhesives [4], packaging [5], and biomedicine [6] because of its toughness [7], adhesiveness [8], biocompatibility [9], swelling behavior [10], lack of toxicity [11], and sufficient thermal stability; it is also odorless and tasteless. However, PVA is highly hydrophilic and water-soluble [12], and its light transmittance is not suitable for light-barrier packaging [13]. In order to expand the application of PVA, much attention has been paid to fabricating functional PVA composites. The existence of hydrogen-bonding groups in PVA structure and the ability to form hydrogen bonds makes PVA suitable for mixing with other materials to improve its functional properties [14,15]. In previous studies, the prepared silica in situ enhanced PVA/chitosan biodegradation films [16], PVA/tea polyphenol composite films [17], PVA reinforced with cellulose nanocrystals or cellulose nanofibers (CNF) [18], and CNF/PVA-borax hybrid foams [19] had...

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Section: Optical Performance Of the Prepared Cqdssupporting

confidence: 79%

“…The quantum yield (QY) of the CQDs in this study was determined by referring to the method reported in the literature [43]. Quinine sulfate was dissolved in 0.1 mL of H2SO4 (Φ = 54%) as a According to the formulation in Table 1, a certain amount of CQDs were mixed with PVA solution or PVA/CNF solution.…”

Section: Characterizations Of the Obtained Cqdsmentioning

confidence: 99%

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Zhang

Pan

et al. 2019

Materials

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“…Biomass lignin, an aromatic polymer containing a structural unit of oxyphenylpropanol or its derivatives, is the second most abundant natural macromolecular organic material in the world . It has a high carbon content and abundant chemical energy and is widely present in gymnosperms, angiosperms, and all vascular plants, whereas industrial biomass lignin mainly includes lignosulfonate, sulfate lignin, and alkali lignin . As an alternative precursor, lignin has been converted to high‐valuable nanoscale fluorescent materials in previous work .…”

Section: Introductionmentioning

confidence: 93%

“…[34][35][36] It has a high carbon content and abundantc hemical energy and is widely presenti ng ymnosperms, angiosperms, and all vascular plants, whereas industrial biomass lignin mainly includes lignosulfonate, sulfate lignin, and alkali lignin. [37][38][39] As an alternative precursor, lignin has been converted to high-valuable nanoscale fluorescent materials in previous work. [25,[40][41][42][43][44][45] For example, Rodríguez-Padróne tal.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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Sustainable, inexpensive, and environmentally friendly biomass waste can be exploited for large‐scale production of carbon nanomaterials. Here, alkali lignin was employed as a precursor to synthesize carbon quantum dots (CQDs) with bright green fluorescence through a simple one‐pot route. The prepared CQDs had a size of 1.5–3.5 nm, were water‐dispersible, and showed wonderful biocompatibility, in addition to their excellent photoluminescence and electrocatalysis properties. These high‐quality CQDs could be used in a wide range of applications such as metal‐ion detection, cell imaging, and electrocatalysis. The wide range of biomass lignin feedstocks provide a green, low‐cost, and viable strategy for producing high‐quality fluorescent CQDs and enable the conversion of biomass waste into high‐value products that promote sustainable development of the economy and human society.

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“…Aside from the core-shell structures, various approaches have been proposed to modify the properties of QDs such as surface reconstruction, [21] deep-level doping [22] and bidisperse mixture. [23] Other popular QD structures include carbon dots [24][25][26] and two dimensional (2D) heterostructures. [27][28][29] Carbon dots are low cost and environment-friendly materials with several advantages such as excellent performances in photoluminescence, photostability and biocompatibility, which enable their implementations in solar energy harvesting and fluorescence imaging.…”

Section: Introductionmentioning

confidence: 99%

Overview of Computational Simulations in Quantum Dots

Yang

et al. 2019

Israel Journal of Chemistry

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Quantum dots (QDs) are semiconductor nanocrystals that exhibit exceptional properties not found in their bulk counterparts. They have attracted extensive academic and industrial attentions due to their quantum confinement effects and unique photophysical properties. Computational approaches such as first principles and classical molecular dynamics simulations are indispensable tools in both scientific studies and industrial applications of QDs. In this review, the state‐of‐the‐art progress in computational simulations of optical, electronic and thermal properties of QDs is summarized and discussed. First, the physics of QDs in low dimensional materials are comprehensively reviewed. Then, the theoretical basis and practical applications of two main computational methods are presented. Properties of QDs revealed by computational studies are summarized respectively. Finally, the paper was concluded with comments on future directions in computational modeling of QDs.

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Photoluminescent lignin hybridized carbon quantum dots composites for bioimaging applications

Cited by 110 publications

References 38 publications

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Overview of Computational Simulations in Quantum Dots

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