Phosphorus induced crystallinity in carbon dots for solar light assisted seawater desalination

Pal, Ayan; Natu, Gayatri; Ahmad, Kafeel; Chattopadhyay, Arun

doi:10.1039/c7ta10224k

Cited by 55 publications

(56 citation statements)

References 41 publications

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“…Strong interaction of boron with nitrogen (as evident from the existence of peak corresponding to B−N bond at 189.6 eV; Figure e) allows incorporation of more nitrogen on the B‐Cdot surface resulting in greater extent of surface passivation. However, in case of phosphorus doping no such interaction was observed between phosphorus and nitrogen . Hence, it could be inferred that reduction of the surface functional groups along with higher degree of surface passivation resulted in increasing the PL efficiency of B‐Cdots.…”

Section: Resultsmentioning

confidence: 96%

“…In order to dope boron in carbon dot system (B‐Cdots) required amount of boric acid [11.1 % H 3 BO 3 (w/w)] was added to the reaction mixture followed by microwave treatment of the same. The details of synthesis procedure based on reported protocol is mentioned in the experimental section …”

Section: Resultsmentioning

confidence: 99%

“…The collected supernatant part was then dialyzed (1 kDa dialysis membrane) for up to 12 h for further purification. Also, the powder of as‐synthesized B‐Cdots was collected after drying the purified dispersion at 60 °C for up to 48 h …”

Section: Methodsmentioning

confidence: 99%

“…Finally, the collected supernatant was dialyzed for 12 h for further purification. The as‐synthesized Cdots were dried at 60 °C for 48 h to get their powdered form …”

Section: Methodsmentioning

confidence: 99%

“…Recent surge in research indicates that bio-friendly carbon dots with the ability to synthesize easily and functionalization, [1] optical properties, [2] and potential applications in diverse fields such as in catalysis, [3] drug delivery, [4] sensing, [5][6][7][8][9] bioimaging, [10] energy storage [11] and conversion, [12] and in light emitting devices [13][14][15] are viable alternatives to semiconductor quantum dots and the metal based nanoparticles. Notably, the optical and possibly other properties of the carbon dots could be tuned by doping with hetero atoms such as the nitrogen (N) sulfur (S) phosphorous (P) and boron (B).…”

Section: Introductionmentioning

confidence: 99%

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Boron Doped Carbon Dots with Unusually High Photoluminescence Quantum Yield for Ratiometric Intracellular pH Sensing

et al. 2019

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Herein we report that boron doping in carbon dots results in increased photoluminescence (PL) quantum yield, which could be used for ratiometric intracellular pH sensing in cancer cell lines. Using a mixture of citric acid monohydrate, thiourea, and boric acid, microwave‐assisted synthesis of boron doped blue emitting carbon dots (B‐Cdots) with an average size of 3.5±1.0 nm was achieved. For B‐Cdots, the maximum quantum yield (QY) was observed to be 25.8 % (11.1 % (w/w) H3BO3 input concentration), whereas, the same was calculated to be 16.9 % and 11.4 % for Cdots (synthesized from citric acid monohydrate and thiourea only) and P‐Cdots (phosphorus doped carbon dots; synthesized using citric acid monohydrate, thiourea and phosphoric acid) (11.1 % (w/w) H3PO4 input concentration), respectively. The observed luminescence efficiencies as obtained from steady state and time‐resolved photoluminescence measurements suggest an alternative emission mechanism due to boron/phosphorus doping in carbon dots. We furthermore demonstrated facile composite formation using B‐Cdots and another carbon dots with orange emission in presence of polyvinyl alcohol (PVA), resulting in white light emission (0.31, 0.32; λex 380 nm). The white light emitting composite enabled ratiometric pH sensing in the aqueous medium and showed favorable uptake properties by cancerous cells for intracellular pH sensing as well.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Finally, the collected supernatant was dialyzed for 12 h for further purification. The as‐synthesized Cdots were dried at 60 °C for 48 h to get their powdered form …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Boron Doped Carbon Dots with Unusually High Photoluminescence Quantum Yield for Ratiometric Intracellular pH Sensing

et al. 2019

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Nanofluid Based on Glucose‐Derived Carbon Dots Functionalized with [Bmim]Cl for the Next Generation of Smart Windows

Gonçalves

Pereira

Lepleux

et al. 2019

Advanced Sustainable Systems

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The design of new advanced materials and technologies is essential for the development of smart windows for the next generation of energy-efficient buildings. Here, it is demonstrated that the functionalization of glucose-derived carbon dots with 1-butyl-3-methylimidazolium chloride results in a self-standing, water-soluble, viscous, reusable nanofluid with self-improving conductivity, thermotropy around 30-40 °C, and ultraviolet blocking ability. Its synthesis is straightforward, clean, fast, and cheap. At 36 °C (hot summer day), a sunactuated thermotropic (TT) device incorporating a 95% w/w nanofluid aqueous solution exhibits a transmittance variation (ΔT) of 9% at 550/1000 nm, which is amplified to 47/31% via the surface plasmon resonance effect. An integrated self-healing system enabling independent sun-actuated TT and voltage-actuated electrochromic (EC) operation is also produced. The low-energy EC device offers bright hot and dark cold modes (ΔT = 68/64%), excellent cycling stability, unprecedented coloration efficiency values (−1.73 × 10 6 /−1.67 × 10 6 cm 2 C −1 (coloring) and +1.12 × 10 7 /+1.08 × 10 7 cm 2 C −1 (bleaching) at ±2.5 V), and impressive memory effect. The disruptive design and sustainable synthesis of the new nanofluid proposed here will foster the agile development of novel products with improved ecological footprint.

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Engineering Lateral Heterojunction of Selenium‐Coated Tellurium Nanomaterials toward Highly Efficient Solar Desalination

et al. 2019

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Herein, a core–shell tellurium–selenium (Te–Se) nanomaterial with polymer‐tailed and lateral heterojunction structures is developed as a photothermal absorber in a bionic solar‐evaporation system. It is further revealed that the amorphous Se shell surrounds the crystalline Te core, which not only protects the Te phase from oxidation but also serves as a natural barrier to life entities. The core (Te)–shell (Se) configuration thus exhibits robust stability enhanced by 0.05 eV per Se atom and excellent biocompatibility. Furthermore, high energy efficiencies of 90.71 ± 0.37% and 86.14 ± 1.02% and evaporation rates of 12.88 ± 0.052 and 1.323 ± 0.015 kg m−2 h−1 are obtained under 10 and 1 sun for simulated seawater, respectively. Importantly, no salting out is observed in salt solutions, and the collected water under natural light irradiation possesses extremely low ion concentrations of Na+, K+, Ca2+, and Mg2+ relative to real seawater. Considering the tunable electronic structures, biocompatibilities, and modifiable broadband absorption of the solar spectrum of lateral heterojunction nanomaterials of Te–Se, the way is paved to engineering 2D semiconductor materials with supporting 3D porous hydrophilic materials for application in solar desalination, wastewater treatment, and biomedical ventures.

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Phosphorus induced crystallinity in carbon dots for solar light assisted seawater desalination

Abstract: A highly ordered crystalline structure in carbon dots (Cdots) can substantially enhance the gamut of their applications in conversion, transfer and transport of energy; however, achievement of such crystallinity in a controlled manner has been elusive.

Cited by 55 publications

References 41 publications

Boron Doped Carbon Dots with Unusually High Photoluminescence Quantum Yield for Ratiometric Intracellular pH Sensing

Boron Doped Carbon Dots with Unusually High Photoluminescence Quantum Yield for Ratiometric Intracellular pH Sensing

Nanofluid Based on Glucose‐Derived Carbon Dots Functionalized with [Bmim]Cl for the Next Generation of Smart Windows

Engineering Lateral Heterojunction of Selenium‐Coated Tellurium Nanomaterials toward Highly Efficient Solar Desalination

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