Synthesis and characterization of graphene–mesoporous silica nanoparticle hybrids

Guardia, L.; Suárez-Garcı́a, Fabián; Paredes, J.I.; Solís‐Fernández, Pablo; Rozada, R.; Fernández-Merino, M.J.; Martı́nez-Alonso, A.; Tascón, J.M.D.

doi:10.1016/j.micromeso.2012.04.038

Cited by 29 publications

(15 citation statements)

References 48 publications

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“…The peaks at 2.11 and 3.6 are due to the presence of graphite-like structures from reduced graphene oxide [11,15,16]. Additionally, the peak at 3.6 has a broad shoulder at 4.63, presumably induced by a bimodal or multimodal character of the interlayer spacing of rGO powder [11] and the peak at 3.6 also confirms the presence of amorphous silica on rGOS [4,17]. The XRD patterns of all the rGOSP samples are very nearly the sample.…”

Section: Resultsmentioning

confidence: 76%

Effect of reduced graphene oxide–silica composite in polyaniline: electrode material for high-performance supercapacitor

Male

Uppugalla

Srinivasan

2015

J Solid State Electrochem

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In order to improve the pseudocapacitance properties and cycle stability of polyaniline (PANI), reduced graphene oxide-silica (rGOS) is used to modify the polyaniline material. Ternary composites of reduced graphene oxide-silica-polyaniline (rGOSP) are prepared by chemical polymerization of aniline using ammonium persulfate oxidant with various amounts of rGOS in aq. 1 M H 2 SO 4 solution. Morphology analysis of rGOSP composite revealed that the nano fibers form of polyaniline is intercalated in the graphene layers and also covered the rGOS. Symmetric supercapacitor cell is fabricated in CR2032 coin cell with rGOSP composite as electrode and its electrochemical performance is evaluated from cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. rGOSP composite yielded a higher capacitance and lower ESR value compared to that of its individual components, PANI and rGOS. The energy density of the composite is found to be 10 W h kg −1 at a power density of 2310 W kg −1 . Furthermore, over 75.2 % of the original capacitance is retained after 6000 galvanostatic charge-discharge cycles at 0.8 A g −1 .

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Section: Resultsmentioning

confidence: 76%

Effect of reduced graphene oxide–silica composite in polyaniline: electrode material for high-performance supercapacitor

Male

Uppugalla

Srinivasan

2015

J Solid State Electrochem

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“…The common procedure for preparing graphene/silica composites is using aqueous graphite oxide dispersion with TEOS and reducing the mixture by chemical or hydrothermal methods in one-pot synthesis process [14,30] or by using surfactants [31]. While adding a mixture of high amounts of RGO (20 %) and deionized water directly to a solution of tetraethyl orthosilicate (TEOS, 98 %, Aldrich) dissolved in ethanol under stirring for 1 h at 110…”

Section: Preparation Of Rgo/silica Compositementioning

confidence: 99%

“…It has possible applications in the development of super capacitor devices, drug delivery, heavy metal removal, biosensors and electrochemical sensor [27][28][29]. There are a few literature data exploring methods for the synthesis of silica/graphene composites by using graphite oxide and TEOS as precursors with or without surfactants [30][31][32]. It is easier to prepare homogeneous composites by the sol-gel method with random distribution of RGO particles directly in the volume of the material.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation of RGO/SiO2 Nanocomposites Prepared by the Sol-Gel Technique

Shalaby¹,

Staneva

Aleksandrov

et al. 2014

Nanoscience Advances in CBRN Agents Detection, Information and Energy Security

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In a previous paper (Shalaby A, Yaneva V, Staneva A, Aleksandrov L, Iordanova R, Dimitriev Y, Nanoscience & nanotechnology -nanostructured materials application and innovation transfer (14), ISSN 1313-8995, 2014) we studied reduced graphene oxide (RGO)/SiO 2 composite material by adding a small amount of RGO to silica in order to avoid the aggregation process and to solve the problems connected with the exfoliation and distribution of the sheets inside the composites. But from a practical point we needed to study the effect of high amounts of RGO on the composites at different temperatures. The purpose of this investigation is to study the effect of RGO on phase transformations of the composites heated at 200, 400 and 800 C. The sol-Gel method was used to obtain the RGO/SiO 2 composite by mixing high amounts of RGO with tetraethyl orthosilicate (TEOS). Data are presented for the transformation of the nanocomposites with increasing temperature in air atmosphere. RGO nanosheets were prepared by chemical exfoliation of purified natural graphite using the Hummers and Offeman method (Hummers WS, Offeman RE, J Am Chem Soc 80:1339, 1958) to obtain graphite oxide. Then the material was exfoliated to reduced graphene nanosheets by ultrasonication and reduction process using sodium borohydride (NaBH 4 ). Characterization of the material was performed by X-ray powder diffraction (XRD), A. Shalaby

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“…Zhang et al prepared silica-GO hybrid composite particles with enhanced thermal stability through deposition of~500 nm silica spheres on the surface of GO [15]. Guardia et al synthesized graphene-mesoporous silica nanoparticle hybrids by selective growth of~50 nm silica nanoparticles on graphene oxide sheets using a cationic surfactant-templated method [16]. However, in the above studies, graphene component and silica component were mixed via a mainly physical interaction and graphene component was completely embedded in the silica matrix.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and osteo-compatibility of novel reduced graphene oxide–aminosilica hybrid nanosheets

Chen

Jia

et al. 2016

Materials Science and Engineering: C

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Synthesis and characterization of graphene–mesoporous silica nanoparticle hybrids

Cited by 29 publications

References 48 publications

Effect of reduced graphene oxide–silica composite in polyaniline: electrode material for high-performance supercapacitor

Effect of reduced graphene oxide–silica composite in polyaniline: electrode material for high-performance supercapacitor

Phase Transformation of RGO/SiO2 Nanocomposites Prepared by the Sol-Gel Technique

Synthesis and osteo-compatibility of novel reduced graphene oxide–aminosilica hybrid nanosheets

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