A method to derivatize surface silanol groups to Si-alkyl groups in carbon-doped silicon oxides

Darmakkolla, Srikar Rao; Tran, Hoang V.; Gupta, Atul; Rananavare, Shankar B.

doi:10.1039/c6ra20355h

Cited by 101 publications

(49 citation statements)

References 64 publications

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“…The Si (2p) deconvoluted spectra contains bands with binding energy values corresponding to Si‐O−Si (102.7 eV) and Si‐OH (103.8 eV) for WCHA and Si−C (101.7 eV), Si‐O−C (102.1 eV), Si‐O−Si (102.9 eV) and Si‐OH (103.7 eV) for WCHA‐TG30 . The O (1 s) spectra of WCHA is characterized by various oxygen functionalities such as that in MgO (530.1 eV), CaO (531.2 eV), Si‐O−Si (532.2 eV) and carbonate group (533 eV) and in the case of WCHA‐TG30 the value at 530.1 eV, 531.1 eV, 531.7 eV, 532.3 eV, 532.7 eV, 533.1 eV and 534.6 eV corresponds to MgO, CaO, Si‐O−C, Si‐O−Si, Mg‐O−C, CO 3 2− and H 2 O respectively . The presence of graphene in the composite is further confirmed from the C (1 s) spectra.…”

Section: Resultsmentioning

confidence: 99%

“…The Si (2p) deconvoluted spectra contains bands with binding energy values corresponding to Si-OÀ Si (102.7 eV) and Si-OH (103.8 eV) for WCHA and SiÀ C (101.7 eV), Si-OÀ C (102.1 eV), Si-OÀ Si (102.9 eV) and Si-OH (103.7 eV) for WCHA-TG30. [57][58][59][60][61] The O (1 s) spectra of WCHA is characterized by various oxygen functionalities such as that in MgO (530.1 eV), 2À and aromatic π-π* interaction in graphene layers respectively. [56][57][58][59][60][61][62][63][64] Thus deconvoluted spectra of each element in the composite WCHA-TG30 confirmed the binding between graphene layers and CHA particles.…”

Section: Icp-aes Analysis Data Shown Inmentioning

confidence: 99%

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A Green Approach for the Synthesis of Coconut Husk Ash –Twisted Graphene Nanocomposites: Novel Catalysts for Solvent‐Free Biginelli Reaction

et al. 2019

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Herein we report an easy, scalable, cost‐effective and green synthesis of twisted graphene from bulk graphite by a ball milling technique with the in situ formation of novel coconut husk ash (CHA) ‐ twisted graphene nanocomposite and its catalytic application towards multicomponent Biginelli reaction. Here the ash derived from naturally available waste material (coconut husk) is effectively used as an exfoliating agent for the scissoring of graphene layers from bulk graphite for the first time. The elemental analysis data obtained by inductively coupled plasma atomic emission spectroscopy (ICP‐AES) provided useful information regarding the composition of CHA and the nanocomposites. The X‐ray diffraction (XRD) patterns confirmed the exfoliation of graphite into graphene layers. Raman spectroscopic analysis evaluated the quality and the nature of graphene layers in the composites. X‐ray photoelectron spectroscopy (XPS) analysis confirmed the bonding between the graphene layers and CHA particles. Transmission electron microscopy (TEM) images revealed the presence of few layered graphene as well as twisted graphene in the composites. The CHA – twisted graphene nanocomposite is found to be an excellent reusable catalyst for Biginelli reaction with a higher yield of 3,4‐dihydropyrimidinones within short duration of reaction.

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Section: Resultsmentioning

confidence: 99%

Section: Icp-aes Analysis Data Shown Inmentioning

confidence: 99%

A Green Approach for the Synthesis of Coconut Husk Ash –Twisted Graphene Nanocomposites: Novel Catalysts for Solvent‐Free Biginelli Reaction

et al. 2019

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“…A complementary XPS analysis is used to confirm for the chemical structural information. The survey spectra obtained from both particles prepared reveal the type of chemical bonds formed with the Si element 57 – 59 . In the deconvoluted high-resolution Si (2p) spectrum of the polymeric core particles, two strong peaks corresponding to Si-C (chemical bond of TPM) and Si-O-C (the silicon ethoxide group in the TPM) are observed (Fig.…”

Section: Resultsmentioning

confidence: 99%

Microfluidic preparation of monodisperse polymeric microspheres coated with silica nanoparticles

Kim

Jin

Jeong

et al. 2018

Sci Rep

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The synthesis of organic-inorganic hybrid particles with highly controlled particle sizes in the micrometer range is a major challenge in many areas of research. Conventional methods are limited for nanometer-scale fabrication because of the difficulty in controlling the size. In this study, we present a microfluidic method for the preparation of organic-inorganic hybrid microparticles with poly (1,10-decanediol dimethacrylate-co-trimethoxysillyl propyl methacrylate) (P (DDMA-co-TPM)) as the core and silica nanoparticles as the shell. In this approach, the droplet-based microfluidic method combined with in situ photopolymerization produces highly monodisperse organic microparticles of P (DDMA-co-TPM) in a simple manner, and the silica nanoparticles gradually grow on the surface of the microparticles prepared via hydrolysis and condensation of tetraethoxysilane (TEOS) in a basic ammonium hydroxide medium without additional surface treatment. This approach leads to a reduction in the number of processes and allows drastically improved size uniformity compared to conventional methods. The morphology, composition, and structure of the hybrid microparticles are analyzed by SEM, TEM, FT-IR, EDS, and XPS, respectively. The results indicate the inorganic shell of the hybrid particles consists of SiO2 nanoparticles of approximately 60 nm. Finally, we experimentally describe the formation mechanism of a silica-coating layer on the organic surface of polymeric core particles.

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“…The highresolution Si 2p spectra of G@SiO 2 -AR shows the peaks at 101.6, 102.4 and 104 eV for SiÀ C, Si OÀ CÀ and OÀ Si-O, respectively. [49] The surface morphology of as prepared GO, G@SiO 2 -AR and SiO 2 @AR were investigated by using Scanning Electron Microscopy (SEM). The thin and wrinkled sheets was observed in SEM images of GO [50] ( Figure S4).…”

Section: Resultsmentioning

confidence: 99%

Remediation of Toxic Dye Pollutants by Using Graphene‐Based Adsorbents

2020

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In this article, we report a facile strategy for the synthesis of G@SiO2‐AR by using silica nanoparticles, which are coated with graphene and alkyd resin. During the synthesis of G@SiO2‐AR, the silica particles have been prepared in situ by hydrolysis of tetraethyl ortho silicate (TEOS). The G@SiO2‐AR has been employed to remove the methylene blue (MB) from aqueous solution. G@SiO2‐AR has a strong affinity to adsorb MB as MB is a cationic dye and it is strongly attracted by anions induced by deprotonation of acid functionality on GO. The detailed adsorption characteristics of G@SiO2‐AR, such as adsorption kinetic and adsorption isotherm has been investigated. The efficiency of dye adsorption on a G@SiO2‐AR has been investigated under various parameters such as contact time, temperature, and pH. The adsorption experiment has been carried out by keeping the constant adsorbent dose in 50 mL of 50 ppm dye solution with varying time intervals such as 5, 10, 15, 20 and 25 min at room temperature. We got better results at 20 min and the dye removal efficiency of G@SiO2‐AR and SiO2@AR is 95.08 % and 87.32 % respectively at room temperature. Also, we carried out the same experiment at different temperatures ranging from 298, 308 and 318 K, out of which the highest adsorption efficiency of above‐mentioned adsorbents has been observed at 318 K up to 99.72 % and 93.16 % respectively. Kinetic data has been shown that the adsorption phenomenon follows the pseudo‐second order kinetic model, while adsorption isotherm follows the Langmuir adsorption isotherm.

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A method to derivatize surface silanol groups to Si-alkyl groups in carbon-doped silicon oxides

Abstract: A carbon-doped silicon oxide (CDO) finds use as a material with a low dielectric constant (k) for copper interconnects in multilayered integrated circuits (ICs).

Cited by 101 publications

References 64 publications

A Green Approach for the Synthesis of Coconut Husk Ash –Twisted Graphene Nanocomposites: Novel Catalysts for Solvent‐Free Biginelli Reaction

A Green Approach for the Synthesis of Coconut Husk Ash –Twisted Graphene Nanocomposites: Novel Catalysts for Solvent‐Free Biginelli Reaction

Microfluidic preparation of monodisperse polymeric microspheres coated with silica nanoparticles

Remediation of Toxic Dye Pollutants by Using Graphene‐Based Adsorbents

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