An Efficient Templating Approach for the Synthesis of Redispersible Size‐Controllable Carbon Quantum Dots from Graphitic Polymeric Micelles

Zhang, Jianming; Abbasi, Farshad; Claverie, Jérôme P.

doi:10.1002/chem.201502158

Cited by 28 publications

(25 citation statements)

References 38 publications

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“…Zhang et al [45] prepared CQDs with tunable size of 2-5 nm from graphitic polymeric micelles, which showed high water solubility due to the surface decorated carboxyl groups. The obtained CQDs were then loaded onto the surface of P25 TiO 2 through a facial dispersionevaporation route, followed by thermal treatment at 300°C in air to remove organic passivation layer for a close contact at hetero interfaces.…”

Section: Photosensitizersmentioning

confidence: 99%

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Cong,

Zhao

2018

Visible-Light Photocatalysis of Carbon-Based Materials

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Carbon quantum dots (CQDs) have been developed as a new member of nanocarbons, characterized by the relatively easy preparation from a wide spectrum of carbonaceous precursors through either bottom-up or top-down routes. Attractive optoelectronic properties have been observed with CQDs, including efficient light absorption, variable photoluminescence (PL), unique up-conversion PL and prominent electron transport ability, which make CQDs an important component with great potential in the design of efficient visible light-driven photocatalysts. In this chapter, detailed contribution of CQDs to the enhanced visible light-driven photocatalysis will be included, in the classification of the role as electron mediator, photosensitizer, spectral converter and sole photocatalyst.

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Section: Photosensitizersmentioning

confidence: 99%

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Cong,

Zhao

2018

Visible-Light Photocatalysis of Carbon-Based Materials

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 4 The interfacial area between the carbon material and TiO 2 also strongly affects the performance of the photocatalyst. 24 For example, TiO 2 NPs distributed at the surface of carbon nanotubes or graphene sheets 7,12,24,29,33,36,37 have only a small overall contact area between the two materials, which acts as a bottleneck for the transport of charge carriers from one material to another. One solution to this problem consists in tightly wrapping the TiO 2 by one or several carbon layers to form TiO 2 @C core@shell structures.…”

Section: Introductionmentioning

confidence: 99%

TiO₂@Carbon Photocatalysts: The Effect of Carbon Thickness on Catalysis

Zhang

Vasei

Sang

et al. 2016

ACS Appl. Mater. Interfaces

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118

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Nanocomposites composed of TiO2 and carbon materials (C) are widely popular photocatalysts because they combine the advantages of TiO2 (good UV photocatalytic activity, low cost, and stability) to the enhanced charge carrier separation and lower charge transfer resistance brought by carbon. However, the presence of carbon can also be detrimental to the photocatalytic performance as it can block the passage of light and prevent the reactant from accessing the TiO2 surface. Here using a novel interfacial in situ polymer encapsulation-graphitization method, where a glucose-containing polymer was grown directly on the surface of the TiO2, we have prepared uniform TiO2@C core-shell structures. The thickness of the carbon shell can be precisely and easily tuned between 0.5 and 8 nm by simply programming the polymer growth on TiO2. The resulting core@shell TiO2@C nanostructures are not black and they possess the highest activity for the photodegradation of organic compounds when the carbon shell thickness is 1-2 nm, corresponding to ∼3-5 graphene layers. Photoluminescence and photocurrent generation tests further confirm the crucial contribution of the carbon shell on charge carrier separation and transport. This in situ polymeric encapsulation approach allows for the careful tuning of the thickness of graphite-like carbon, and it potentially constitutes a general and efficient route to prepare other oxide@C catalysts, which can therefore largely expand the applications of nanomaterials in catalysis.

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“…34 The zeta potential of the CNDs was −22.3 mV at a pH of 5.86 (Table S4), owing to the presence of carboxylate groups on the surface; further corroborating that the CNDs are highly dispersed and stable in the aqueous system. 35, 36 In summation, the structure of the CNDs in this study are spheroidal with an average size of 3 nm and composed of a disordered graphite structure with surrounding amorphous carbon frames and functional groups on the surfaces.…”

Section: Resultsmentioning

confidence: 90%

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

Zeng

Zhang

Arvapalli

et al. 2017

Phys. Chem. Chem. Phys.

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Carbon nanodots (CNDs) have attracted great attention due to their superior solubility, biocompatibility, tunable photoluminescence, and opto-electronic properties. This work describes a new fluorescence-based spectroelectrochemistry approach to simultaneously study the photoluminescence and wavelength dependent photocurrent of microwave synthesized CNDs. The fluorescence of CNDs has a selective quench upon a reversible redox couple, ferricyanide/ferrocyanide,− reaction during the cyclic voltammetry. The CNDs modified gold slide electrode demonstrates wavelength dependent photocurrent generation during the fluorescence-electrochemical study, suggesting potential application in photoelectronics. UV-Vis absorption and electrochemistry are used to quantify the energy gap of the CNDs, and then to calibrate a Hückel model for the CNDs electronic energy levels. The Hückel (or tight binding) model treatment of an individual CND as a molecule combines the conjugated π states (C=C) with the functional groups (C=O, C-O, and COOH) associated with the surface electronic states. This experimental and theoretical investigation of the CNDs provides a new perspective on the optoelectronic properties of CNDs and should aid in their development for practical use in biomedicine, chemical sensing, and photoelectric devices.

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An Efficient Templating Approach for the Synthesis of Redispersible Size‐Controllable Carbon Quantum Dots from Graphitic Polymeric Micelles

Cited by 28 publications

References 38 publications

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

TiO₂@Carbon Photocatalysts: The Effect of Carbon Thickness on Catalysis

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

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An Efficient Templating Approach for the Synthesis of Redispersible Size‐Controllable Carbon Quantum Dots from Graphitic Polymeric Micelles

Cited by 28 publications

References 38 publications

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

TiO2@Carbon Photocatalysts: The Effect of Carbon Thickness on Catalysis

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

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TiO₂@Carbon Photocatalysts: The Effect of Carbon Thickness on Catalysis