Eco-friendly carbon-nanodot-based fluorescent paints for advanced photocatalytic systems

Park, So Young; Lee, Hyun Uk; Lee, Young-Chul; Choi, Seo Young; Cho, Dae‐Hyun; Kim, Hee Sik; Bang, Sunghee; Seo, Soonjoo; Lee, Soon Chang; Won, Jonghan; Son, Byung-Chul; Yang, Mikyung; Lee, Jun Young

doi:10.1038/srep12420

Cited by 27 publications

(7 citation statements)

References 36 publications

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“…At the purification degree of 90%, the cell viability remained high: over 86% for HeLa cells, 92% for MCF-7 cells, and 90% for HaCaT cells. We found that the water purified (to degrees up to 90%) by the H-TiO 2 120 photocatalyst left non- or minimal cytotoxicity in the cells 51 . This result confirms that the water purified by the H-TiO 2 120 photocatalysts is safe for humans.…”

Section: Resultsmentioning

confidence: 83%

Advanced nanoporous TiO2 photocatalysts by hydrogen plasma for efficient solar-light photocatalytic application

Park

Kim

et al. 2016

Sci Rep

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We report an effect involving hydrogen (H2)-plasma-treated nanoporous TiO2(H-TiO2) photocatalysts that improve photocatalytic performance under solar-light illumination. H-TiO2 photocatalysts were prepared by application of hydrogen plasma of assynthesized TiO2(a-TiO2) without annealing process. Compared with the a-TiO2, the H-TiO2 exhibited high anatase/brookite bicrystallinity and a porous structure. Our study demonstrated that H2 plasma is a simple strategy to fabricate H-TiO2 covering a large surface area that offers many active sites for the extension of the adsorption spectra from ultraviolet (UV) to visible range. Notably, the H-TiO2 showed strong ·OH free-radical generation on the TiO2 surface under both UV- and visible-light irradiation with a large responsive surface area, which enhanced photocatalytic efficiency. Under solar-light irradiation, the optimized H-TiO2 120(H2-plasma treatment time: 120 min) photocatalysts showed unprecedentedly excellent removal capability for phenol (Ph), reactive black 5(RB 5), rhodamine B (Rho B) and methylene blue (MB) — approximately four-times higher than those of the other photocatalysts (a-TiO2 and P25) — resulting in complete purification of the water. Such well-purified water (>90%) can utilize culturing of cervical cancer cells (HeLa), breast cancer cells (MCF-7), and keratinocyte cells (HaCaT) while showing minimal cytotoxicity. Significantly, H-TiO2 photocatalysts can be mass-produced and easily processed at room temperature. We believe this novel method can find important environmental and biomedical applications.

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Section: Resultsmentioning

confidence: 83%

Advanced nanoporous TiO2 photocatalysts by hydrogen plasma for efficient solar-light photocatalytic application

Park

Kim

et al. 2016

Sci Rep

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“…The most commonly used bottom-up approaches to produce CDs include microwave approach [31,32,33,34], thermal decomposition [35,36], ultrasonic treatment [37,38], and hydrothermal treatment [39,40,41,42], among others (e.g., pyrolysis [43]). This route utilizes various small or large precursor materials, including both natural and synthetic polymers.…”

Section: Synthesis Methods Of Carbon Dotsmentioning

confidence: 99%

“…Bare polyethylene glycol (PEG, Mn = 300) was treated with simple ultrasound irradiation at room temperature for 1, 2, 3, or 4 h without additional solvents, achieving CDs with size of 2-6 nm and quantum yield of up to 14% [37]. The PL emission intensity gradually increased with the increasing synthesis time.…”

Section: Synthesis Methods Of Carbon Dotsmentioning

confidence: 99%

“…CDs made from peanut shells exhibited higher quantum yield when the pyrolysis time increased from 1 to 4 h [43]. The PEG-derived CDs showed gradually increased PL emission intensity with the increasing ultrasound irradiation time from 1 to 4 h [37]. CDs derived from citrus pectin showed stronger fluorescence intensity when the hydrothermal temperature (100, 120, 150, and 180 °C) increased [45].…”

Section: Synthesis Methods Of Carbon Dotsmentioning

confidence: 99%

“…Polyacrylamide was hydrothermally treated for different amount of time, generating CDs (QY of ~12%) with different core sizes (5, 20, 50 nm), for cell imaging application [65]. PEG-derived CDs via ultrasound irradiation, with QY of up to 14%, were incorporated into a TiO 2 photocatalytic system for improved detoxification of organic dyes [37].…”

Section: Materials For Carbon Dot Synthesismentioning

confidence: 99%

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Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

et al. 2019

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Carbon dots (CDs), a class of carbon-based sub-ten-nanometer nanoparticles, have attracted great attention since their discovery fifteen years ago. Because of the outstanding photoluminescence properties, photostability, low toxicity, and low cost, CDs have potential to replace traditional semiconductor quantum dots which have serious drawbacks of toxicity and high cost. This review covers the common top-down and bottom-up methods for the synthesis of CDs, different categories of CD precursors (small molecules, natural polymers, and synthetic polymers), one-pot and multi-step methods to produce CDs/photocatalyst composites, and recent advances of CDs on photocatalysis applications mostly in pollutant degradation and energy areas. A broad range of precursors forming fluorescent CDs are discussed, including small molecule sole or dual precursors, natural polymers such as pure polysaccharides and proteins and crude bio-resources from plants or animals, and various synthetic polymer precursors with positive, negative, neutral and hydrophilic, hydrophobic, or zwitterionic feature. Because of the wide light absorbance, excellent photoluminescence properties and electron transfer ability, CDs have emerged as a new type of photocatalyst. Recent work of CDs as sole photocatalyst or in combination with other materials (e.g., metal, metal sulfide, metal oxide, bismuth-based semiconductor, or other traditional photocatalysts) to form composite catalyst for various photocatalytic applications are reviewed. Possible future directions are proposed at the end of the article on mechanistic studies, production of CDs with better controlled properties, expansion of polymer precursor pool, and systematic studies of CDs for photocatalysis applications.

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Nanogenerators Begin to Light Up: A Novel Poling‐Free Piezoelectric System with Multicolor Photoluminescence as an Efficient Mechatronics Development Platform

Jin

Huang

et al. 2018

Adv Materials Inter

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the utilization of wide-ranging renewable energy. An enlightening idea has arisen over the latest publications to harvest environmental energy through employment of various piezoelectric, pyroelectric, and triboelectric materials. [1,2] Thereinto, piezoelectric materials, possessing the ability to capture mechanical energy with different amplitudes and frequencies, have been intensively developed to harvest energy from the ambient environment. [3,4] Energy harvesting is becoming a major technological trend not only for pure and clean energy production but equal importantly for aiding the development of energy autonomous monitoring systems like large area wireless access networks [5] or body wearable sensors that form key parts of the future Internet of Things ecosystem. Piezoelectric materials act as energy transducers through generating charges on the surfaces in response to an applied force. [6] In the past reports, ZnO nanowires were considered to be the excellent materials for developing nanogenerators compared with other traditional piezoelectric materials. Nonetheless, drawbacks to the prevalent application of ZnO nanowire materials are obvious too, such as the relatively low piezoelectric coefficient. [7] Furthermore widely used piezo-ceramic materials, despite their mechanical robustness and relatively high electromechanical coupling coefficient, exhibit also certain intrinsic major drawbacks such as limited mechanical flexibility, high fragility, and usually high content In this work, a novel design of poly (vinylidene fluoride)/carbon quantum dots (PVDF/CQDs) based flexible poling-free hybrid material system able to efficiently convert small amounts of mechanical energy into electricity through the intrinsic piezoelectric nanostructures is reported. The PVDF/ CQDs composite is fabricated through solution casting followed by a highpressure crystallization process. The introduction of 3D quasi-spherical CQDs has in situ induced the self-assembly of polymorphic substructures in the PVDF crystallites at high pressure, and piezoelectric 3D nanosheet arrays, 1D nanometer small sticks, and 1D nanowires, respectively, are formed in situ with the increase of CQDs concentration. Without any electrical polarization treatment, the maximum open-circuit voltage output density of the durable composite system reaches 19.2 V cm −2 and short-circuit current output density of 550 nA cm −2 , both far exceeding that of pure PVDF. Simultaneously, owing to the successful incorporation of CQDs, the material shows excellent fluorescent effect with high stability, and its multicolor photoluminescence is well retained even after the endurance for a rigorous treatment at high pressure and high temperature. The as-developed environmental friendly PVDF/ CQDs compound may diversify niche applications in a new-generation of self-powered autonomous optoelectronic devices, biosensors, cell imaging, and so on.

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Eco-friendly carbon-nanodot-based fluorescent paints for advanced photocatalytic systems

Cited by 27 publications

References 36 publications

Advanced nanoporous TiO2 photocatalysts by hydrogen plasma for efficient solar-light photocatalytic application

Advanced nanoporous TiO2 photocatalysts by hydrogen plasma for efficient solar-light photocatalytic application

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

Nanogenerators Begin to Light Up: A Novel Poling‐Free Piezoelectric System with Multicolor Photoluminescence as an Efficient Mechatronics Development Platform

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