Mesoporous silica particle embedded functional graphene oxide as an efficient platform for urea biosensing

Abraham, Shiju; Ciobotă, Valerian; Srivastava, Saurabh; Srivastava, Sunil K.; Singh, Rajesh Kumar; Dellith, Jan; Malhotra, Bansi D.; Schmitt, Michael; Popp, Jürgen; Srivastava, Anchal

doi:10.1039/c4ay01303d

Cited by 38 publications

(24 citation statements)

References 43 publications

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“…Comparing the FTIR spectrum of the two samples shows that the intensity of IR bands in Si-GO10 sample is higher than that of Si-GO30 sample because the presence of carboxylic functional groups is decreased by increasing silica particles. This change coincides with an increase in relative intensity in the 1087.25 cm -1 band, which is related to the stretching fluctuations of C-O bonds of the alkoxide groups [52][53][54][55][56].…”

Section: Photocatalytic Activitymentioning

confidence: 59%

Synthesis, characterization, photoluminescence, and antibacterial activities of silica-graphene oxide composites

et al. 2021

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In this research, a novel thin film Si-GO10 and nano-powders Si-GO30 of silica-graphene oxide composite were prepared via sol-gel method and deposited on glass substrates using spray pyrolysis. XRD results showed a relatively strong peak in graphite layer that corresponds to the plane of (002). TEM images displayed that SiO<sub>2</sub> nano-particles were randomly distributed on the surface of Si-GO30 sample, and the particle size in these nano-powders was below 50 nm. Moreover, silica nano-particles on the surface of GO plates exhibited almost a spherical and rod-like nanoparticles shapes, which in turn confirmed the formation of SiO<sub>2</sub>-GO nano-hybrids. FESEM analysis reveals a different morphology, the Si-GO10 sample is so rough and crumble, while the Si-GO30 sample is relatively smooth on the surface. Photocatalytic investigations revealed the composite materials exhibit high activity for dye adsorption and decomposition. Si-GO10 thin film did not undergo degradation after 120 minutes, however, for Si-GO30 nano-powder, the adsorption peak intensity was reduced to 665 nm, indicating a decrease in the dye concentration in the solution. FTIR analysis demonstrated that carboxylic functional groups are decreased by increasing silica particles. Photo-Luminescence (PL) spectrum in Si-GO10 thin film disclosed a severe emission peak at about 675 nm. This spectrum was completely disappeared in Si-GO30 nano-powders. Results of the antibacterial properties emphasized that Si-GO30 nano-particle would prevent Escherichia. coli growth after 20 hours. The presented methodology allows for the synthesis of graphene oxide supported silicon dioxide nano-particles for promising applications in photocatalytic and antibacterial fields.

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Section: Photocatalytic Activitymentioning

confidence: 59%

Synthesis, characterization, photoluminescence, and antibacterial activities of silica-graphene oxide composites

et al. 2021

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“…In other words, these structures are composed of stacked multilayer graphene sheets with silica nanoparticles, which can be clearly seen in FESEM images [38,39].…”

Section: Resultsmentioning

confidence: 95%

Spray pyrolysis of graphene oxide based composite for optical and wettability applications

Alkhafaji

Khaleel

Miran

2020

Mater. Res. Express

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In this study, silica-graphene oxide nano-composites were prepared by sol-gel technique and deposited by spray pyrolysis method on glass substrate. The effect of changing the graphene/silica ratio on the optical properties and wetting of these nano-structures has been investigated. The structural and morphological properties of the thin films have been studied by x-ray diffraction spectroscopy (XRD), field emission scanning electron microscope (FESEM), energy dispersive x-ray spectroscopy (EDS) and atomic force microscope (AFM). XRD results show that silica structures present in the synthesized films exhibit amorphous character and there is a poor arrangement in graphene plates along their accumulation directions. The relationship between the contact angle of the water drop and the surface of thin films was analyzed by surface roughness. The results show that the contact angle is also decreased by decreasing the surface roughness. Absorption and transmittance spectra obtained from (UV-vis) of the studied films were used to compute and determine some optical parameters such as absorption coefficient, transmittance rate, optical gap, refractive index and extinction coefficient of the films. The calculated optical band gaps of films decrease by increase the silica contents in these structures.

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“…The functional groups were identified by Fourier transform infrared (FTIR) spectra in the range of 400-4000 cm À1 using Perkin-Elmer 781 instrument. 1 H NMR and 13 C NMR were recorded on a Bruker DRX-400 spectrometer using DMSO-d 6 as solvent. A Mira3 TE SCAN field emission scanning electron microscope (FESEM) instrument was used for determining the morphology of catalyst and the distribution of KCC-1 on GO.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 5a shows that there is a sharp peak at of 2θ = 10 that corresponds to the GO structure. [13] XRD pattern of KCC-1 in Figure 5b shows two broad peaks at 2θ of 5 to 10 and 15 to 30 that indicated low and high diffraction angles, respectively. The broad peak in low angle is related to the porous structure of KCC-1.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…[10,11] Nanoparticles are not in their most stable structural state; they have very high surface activity and are therefore prone to sticking, clumping, and thus losing nanoscale dimensions. [12,13] Therefore, catalyst support is necessary to increase stability and decrease the accumulation of nanoparticles. In recent years, heterogeneous catalysts based on nanomaterials such as graphene oxide (GO), silica, and magnetic nanoparticles attracted most attention to the synthesis of organic compounds under green conditions.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of GO/KCC‐1/Ni(II) as an efficient catalyst for the green synthesis of some 1,8‐dioxodecahydroacridine derivatives

Zare

Moradi

2021

Applied Organom Chemis

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Herein, we successfully prepared a new heterogeneous catalyst for the synthesis of some 1,8-dioxodecahydroacridine derivatives. The catalyst was prepared through the loading of KCC-1 nanoparticles on graphene oxide (to prevent the agglomeration of KCC-1 nanoparticles and extended the surface area), and the immobilization of Ni(II) on GO/KCC-1 was done using a simple procedure.The structure of catalyst was characterized using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), elemental mapping, and thermogravimetric analysis (TGA) techniques. One-pot pseudo-four-component reaction for the synthesis of 1,8-dioxodecahydroacridines was performed under green conditions, and products were obtained in good to excellent yields. The structure of 1,8-dioxodecahydroacridines was confirmed with FTIR, 1 H NMR, and 13 C NMR. Easy recovery and reusability of the catalyst, green conditions, short reaction times with high yield of products, and high-efficient catalyst are some advantages of presented method.

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Mesoporous silica particle embedded functional graphene oxide as an efficient platform for urea biosensing

Abstract: Mesoporous silica particle-embedded graphene oxide (GO) is a promising platform for electrochemical biosensing. We report a GO–SiO2 composite electrode for urea detection, with excellent reproducibility, specificity and stability.

Cited by 38 publications

References 43 publications

Synthesis, characterization, photoluminescence, and antibacterial activities of silica-graphene oxide composites

Synthesis, characterization, photoluminescence, and antibacterial activities of silica-graphene oxide composites

Spray pyrolysis of graphene oxide based composite for optical and wettability applications

Preparation and characterization of GO/KCC‐1/Ni(II) as an efficient catalyst for the green synthesis of some 1,8‐dioxodecahydroacridine derivatives

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