Simultaneous functionalization and reduction of graphene oxide with diatom silica

Dalagan, Juliet Q.; Enriquez, Erwin P.; Li, Lain‐Jong

doi:10.1007/s10853-012-7128-1

Cited by 15 publications

(13 citation statements)

References 34 publications

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“…[44] Peaks at 1105 cm À1 and at approximately 1260-1300 cm À1 corresponding to SiÀOÀC [40] and SiÀOÀC(=O), [45] respectively, are absent. In comparison to silica, composites with a higher concentration of GO show broadening of the peak at 960 cm À1 and the appearance of a new peak at 615 cm À1 .…”

Section: Resultsmentioning

confidence: 99%

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Tuning the Mechanical and Adsorption Properties of Silica with Graphene Oxide

et al. 2014

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Silica and graphene oxide (GO) were synthesized by modified Stöber and Hummer’s methods, respectively. Silica/GO composite powders of different compositions were obtained by introduction of GO sheets in between silica particles through a hydrothermal synthesis. Composites were characterized by Fourier transform infrared spectroscopy, X‐ray diffraction analysis, and scanning and transmission electron microscopy. Density measurements were performed with a pycnometer and chemical analyses of powders were performed by energy‐dispersive X‐ray and X‐ray photoelectron spectroscopies. Composite powders showed an improvement in the Cu2+ ion adsorption property relative to pure silica. Composite powders were further consolidated at 1200 °C under 50 MPa pressure in vacuum by pulsed electric current sintering. Transparency in the UV/Vis region, the electrical conductivity, and the toughness of consolidated samples were altered by varying the GO content in the starting materials. Studies suggest that the use of GO as a reinforcing agent not only improves the mechanical properties of transparent silica ceramic, but also improves the electrical conductivity and adsorption properties of silica.

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Section: Resultsmentioning

confidence: 99%

“…The peak at 615 cm À1 may be attributed to a-cristobalite. [44] Peaks at 1105 cm À1 and at approximately 1260-1300 cm À1 corresponding to SiÀOÀC [40] and SiÀOÀC(=O), [45] respectively, are absent. This clearly indicates there is no direct SiÀOÀC bond from silica to graphene.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Mechanical and Adsorption Properties of Silica with Graphene Oxide

et al. 2014

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“…Due to the inertness of diatoms' biosilica, a covalent modification of its surface was also carried out to develop technologically more suitable materials for energy production or optoelectronics. For example, a simultaneous functionalization and reduction of graphene oxide (GO) with diatom frustules, was employed to realize a reduced GO–biosilica composite that was proposed as an electrode in sensing cationic biomolecules . The hydroxyl and carboxylic moieties present in GO and the silanol (SiOH) and siloxane (SiOSi) groups in diatom silica were employed for the formation of the SiOC bond by a direct esterification reaction and simultaneous reduction.…”

Section: Covalent Functionalization Of the Surface Of Frustulesmentioning

confidence: 99%

Multiple Routes to Smart Nanostructured Materials from Diatom Microalgae: A Chemical Perspective

et al. 2017

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Diatoms are unicellular photosynthetic microalgae, ubiquitously diffused in both marine and freshwater environments, which exist worldwide with more than 100 000 species, each with different morphologies and dimensions, but typically ranging from 10 to 200 µm. A special feature of diatoms is their production of siliceous micro- to nanoporous cell walls, the frustules, whose hierarchical organization of silica layers produces extraordinarily intricate pore patterns. Due to the high surface area, mechanical resistance, unique optical features, and biocompatibility, a number of applications of diatom frustules have been investigated in photonics, sensing, optoelectronics, biomedicine, and energy conversion and storage. Current progress in diatom-based nanotechnology relies primarily on the availability of various strategies to isolate frustules, retaining their morphological features, and modify their chemical composition for applications that are not restricted to those of the bare biosilica produced by diatoms. Chemical or biological methods that decorate, integrate, convert, or mimic diatoms' biosilica shells while preserving their structural features represent powerful tools in developing scalable, low-cost routes to a wide variety of nanostructured smart materials. Here, the different approaches to chemical modification as the basis for the description of applications relating to the different materials thus obtained are presented.

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“…The components were mixed in a boiling ask and reuxed for 24 h at 100 C. The zeolite was washed aer 24 h with absolute ethanol, centrifuged, and dried at 100 C. This method was based on a published method. 14 Dip coating method. A dip coating device was designed out of a 15 mL test tube, a rod, and a plankton bucket net (0.008 mm Â 0.012 mm).…”

Section: Methods Of Coating Of Zeolite Particles With Graphene Oxidementioning

confidence: 99%

Graphene-oxide loading on natural zeolite particles for enhancement of adsorption properties

Silva

Lecus

Gajdardziska‐Josifovska

et al. 2020

RSC Adv.

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Simultaneous functionalization and reduction of graphene oxide with diatom silica

Cited by 15 publications

References 34 publications

Tuning the Mechanical and Adsorption Properties of Silica with Graphene Oxide

Tuning the Mechanical and Adsorption Properties of Silica with Graphene Oxide

Multiple Routes to Smart Nanostructured Materials from Diatom Microalgae: A Chemical Perspective

Graphene-oxide loading on natural zeolite particles for enhancement of adsorption properties

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