Polyoxometalate assisted photoreduction of graphene oxide and its nanocomposite formation

Li, Haolong; Pang, Shuping; Feng, Xinliang; Müllen, Kläus; Bubeck, Christoph

doi:10.1039/c0cc01098g

Cited by 164 publications

(148 citation statements)

References 39 publications

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“…[17][18][19]23,25,26,30,35,37,[52][53][54][55][56][57][58][59] These plenary POMs can be reduced by multiple electrons while maintaining their structural integrity and act as cathodes to efficiently transfer electrons to the organic material or metal.…”

Section: (α2) Via Uv Irradiationmentioning

confidence: 99%

“…[17][18][19][37][38][39]57,58 Here we employ photoactivation of the lacunary α2 for reduction of TcO 4 -and ReO 4 -, and complexation of the reduced metal into the defect binding site. The α2 accepts 2 electrons from a sacrificial electron donor and transfers these electrons to TcO 4 -for reduction to Tc V quantitatively in a "one-pot" reaction.…”

Section: (α2) Via Uv Irradiationmentioning

confidence: 99%

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Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

et al. 2011

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ABSTRACTproduct. The reduction and incorporation of TcO 4 -was accomplished in a "one pot" reaction using both sunlight and UV irradiation, and monitored as a function of time using multinuclear NMR and radio TLC. The process was further probed by the "step-wise" generation of reduced α 2 -P 2 W 17 O 61 12-through bulk electrolysis followed by the addition of TcO 4 -. serving as models for metal oxides, POMs may also provide a suitable platform to study the molecular level dynamics and mechanisms of the reduction and incorporation of Tc into a material.

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Section: (α2) Via Uv Irradiationmentioning

confidence: 99%

Section: (α2) Via Uv Irradiationmentioning

confidence: 99%

Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

et al. 2011

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“…An additional obstacle that presents itself when chemically reduced graphene oxide (rGO) is produced is the poor quality of the process. This is because the rGO tends to form irreversible aggregations, which result from strong van der Waals attractive forces between the graphene planes, unless a modification step (both covalent and non-covalent) is included in the process (44,45,46). Recently, efforts have been made toward addressing the above-mentioned problems by using natural products instead of toxic-reducing agents.…”

Section: Introductionmentioning

confidence: 99%

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

Khenfouch

Ndimba

Diallo

et al. 2016

Green Chemistry Letters and Reviews

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Nowadays graphene is universally known as a promising material. Hence, the development of ecofriendly synthesis methods for this material is of great importance. This study reports on the biosynthesis of graphene by a green chemistry process using Artemisia herba-alba Asso (AHAA) natural extract. Moreover, this work reports on the physical properties, including surface/ interface and optical and electrical properties of the obtained graphene sheets. UV-VIS, Raman, XPS spectroscopies and TEM microscopy investigations confirmed the reduction, and the conversion of graphene oxide to few-layered reduced graphene oxide as well as the efficiency of this plant extract compared with several natural extracts and chemical agents. Furthermore, it was found that the optical and electrical properties of graphene can be modulated and controlled via this eco-friendly cost-effective process. Hence, AHAA can be an effective chelating agent to produce graphene sheets. ARTICLE HISTORY

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“…They observed over an order of magnitude increase in conductivity after the reduction of graphene oxide TiO 2 suspension. Another facile method was reported by Li et al by using polyoxometalate as a catalyst [3]. This method was used by Zhang et al for inkjet printing of multi-layer films, which were demonstrated to be excellent chemical sensors [4].…”

mentioning

confidence: 99%

Photoreduction and Thermal Properties of Graphene-Based Flexible Films

Naik¹,

Krishnaswamy²

2017

Graphene

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In the present study, we report on an efficient method for large-area photoreduction of graphene oxide flexible films. The laser-based reduction can be carried out in situ and can be tuned to attain the properties required. A systematic study has been conducted to evaluate the variation of the degree of reduction with the actual reduction temperature, which is measured using an infrared thermal camera. Local reduction temperature is varied up to 350˚C, and the degree of reduction is measured using the C/O ratio. The C/O ratio is increased from 2:1 for graphene oxide to 10:1 for reduced graphene oxide. This high degree of reduction is observed at low temperatures, and also in a short period of time. Thermal conductivity properties calculated using the temperature distribution shows the in-plane thermal conductivities of graphene oxide and reduced graphene oxide are a few orders of magnitude lower than single layer graphene. This can be attributed to oxygen-defect scattering, and also due to the heat conduction through the thickness of the sample by way of contact between adjacent flakes. This photoreduction method provides a way for roll-to-roll scalable production of graphene-based flexible films.

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Polyoxometalate assisted photoreduction of graphene oxide and its nanocomposite formation

Abstract: We have developed a green method to reduce graphene oxide via a UV-irradiated photoreduction process in which H(3)PW(12)O(40) was used as photocatalyst. Moreover, H(3)PW(12)O(40) can adsorb on the reduced graphene oxide as anionic stabilizer and lead to water dispersible graphene sheets.

Cited by 164 publications

References 39 publications

Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

Photoreduction and Thermal Properties of Graphene-Based Flexible Films

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Polyoxometalate assisted photoreduction of graphene oxide and its nanocomposite formation

Abstract: We have developed a green method to reduce graphene oxide via a UV-irradiated photoreduction process in which H(3)PW(12)O(40) was used as photocatalyst. Moreover, H(3)PW(12)O(40) can adsorb on the reduced graphene oxide as anionic stabilizer and lead to water dispersible graphene sheets.

Cited by 164 publications

References 39 publications

Photoreduction of99Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Photoreduction of99Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

Photoreduction and Thermal Properties of Graphene-Based Flexible Films

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Product

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Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium

Photoreduction of⁹⁹Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium