In-situ hybridization of ZnO nanorod and graphene oxide with enhancing photocatalytic activity

In this work, nanohybridization of ZnO nanorod and graphene oxide (GO) were prepared by a facile hydrothermal method. The effects of GO on crystal structure and surface morphology of ZnO were revealed by Scanning electron microscopy (SEM), Raman, and X-ray diffraction (XRD). The presence of GO in the composite resulted the ZnO nanorod more uniform which its diameter size was decreased. Optical properties characterized by UV-vis diffuse reflectance spectra (DRS) showed that the ZnO/GO composite has the narrower bandgap value and the better visible-light absorption characterisitics in compare to the bare ZnO. As a result, the photocatalytic ability in degradation of methylene blue under solar irradiation was enhanced in the ZnO/GO composite.

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Accelerated Thermal Decomposition of Graphene Oxide Films in Air via in Situ X-ray Diffraction Analysis

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.6b05031 ◽

2016 ◽

Vol 120 (27) ◽

pp. 14984-14990 ◽

Cited By ~ 28

Author(s):

Qin Pan ◽

Ching-Chang Chung ◽

Nanfei He ◽

Jacob L. Jones ◽

Wei Gao

Keyword(s):

Thermal Decomposition ◽

Graphene Oxide ◽

Diffraction Analysis ◽

Oxide Films ◽

X Ray Diffraction ◽

X Ray

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Graphene Oxide/Fe3O4 Composites Prepared via In Situ Precipitation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.904.150 ◽

2014 ◽

Vol 904 ◽

pp. 150-154

Author(s):

Zhe Wei Yang ◽

Xin Fan ◽

Li Ang Guo ◽

Wei Ting Wei

Keyword(s):

Graphene Oxide ◽

Specific Capacitance ◽

Precipitation Method ◽

Electrochemical Performances ◽

Composite Electrodes ◽

X Ray Diffraction ◽

Bonding Force ◽

X Ray

The graphene oxide/Fe3O4 composites were prepared by in situ precipitation method in this article. The microstructure and surface morphology of composites were characterized by Fourier transform infrared spectrum, X-ray diffraction and scanning electron microscopy, respectively. Cyclic voltammetry was employed for the determination of specific capacitance and other electrochemical performances. It was shown that there was the chemical bonding force between GO and Fe3O4 particles. And the surfaces of GO were wrapped by the Fe3O4 particles precipitated on the surfaces of GO sheets and no impurities were detected. Furthermore, the specific capacitance of GO/Fe3O4 composite electrodes decreased as Fe3O4 particles reduced and the redox peaks became weaker owing to the addition of nonconductive Fe3O4 particles.

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Chemical Vapor Functionalization of ZnO Nanocrystals

MRS Proceedings ◽

10.1557/proc-1260-t01-05 ◽

2010 ◽

Vol 1260 ◽

Cited By ~ 1

Author(s):

Moazzam Ali ◽

Marty D. Donakowski ◽

Markus Winterer

Keyword(s):

Gas Phase ◽

Diffuse Reflectance ◽

Chemical Vapor ◽

X Ray Diffraction ◽

X Ray ◽

Zno Nanocrystals ◽

In Series ◽

Lower Temperature ◽

Diffuse Reflectance Infrared

AbstractChemical Vapor Functionalization (CVF) is a method in which nanocrystals undergo in situ functionalization in the gas phase. In CVF, two reactors are used in series. The first reactor consists of a hot quartz tube (1073 K) where ZnO nanocrystals are synthesized in the gas phase from diethylzinc and oxygen. The second reactor, connected at the exit of the first one and kept at lower temperature (673 K), is used as functionalization chamber. At the connecting point of the two reactors, vapors of organic functionalizing agents are injected which react with the surface of ZnO nanocrystals. ZnO nanocrystals have been functionalized by 1-hexanol, n-hexanoic acid, n-hexanal and 1-hexylamine. Functionalized ZnO nanocrystals have been characterized by Dynamic Light Scattering, X-ray Diffraction and Diffuse Reflectance Infrared Fourier Transform Spectroscopy.

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Superflexibility of graphene oxide

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1605121113 ◽

2016 ◽

Vol 113 (40) ◽

pp. 11088-11093 ◽

Cited By ~ 51

Author(s):

Philippe Poulin ◽

Rouhollah Jalili ◽

Wilfrid Neri ◽

Frédéric Nallet ◽

Thibaut Divoux ◽

...

Keyword(s):

Graphene Oxide ◽

Unique Feature ◽

Bending Rigidity ◽

X Ray Diffraction ◽

Synchrotron Source ◽

X Ray ◽

Bending Modulus ◽

Bendable Electronics ◽

Very High

Graphene oxide (GO), the main precursor of graphene-based materials made by solution processing, is known to be very stiff. Indeed, it has a Young’s modulus comparable to steel, on the order of 300 GPa. Despite its very high stiffness, we show here that GO is superflexible. We quantitatively measure the GO bending rigidity by characterizing the flattening of thermal undulations in response to shear forces in solution. Characterizations are performed by the combination of synchrotron X-ray diffraction at small angles and in situ rheology (rheo-SAXS) experiments using the high X-ray flux of a synchrotron source. The bending modulus is found to be 1kT, which is about two orders of magnitude lower than the bending rigidity of neat graphene. This superflexibility compares with the fluidity of self-assembled liquid bilayers. This behavior is discussed by considering the mechanisms at play in bending and stretching deformations of atomic monolayers. The superflexibility of GO is a unique feature to develop bendable electronics after reduction, films, coatings, and fibers. This unique combination of properties of GO allows for flexibility in processing and fabrication coupled with a robustness in the fabricated structure.

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In Situ Synchrotron X-Ray Diffraction Characterization of the Synthesis of Graphene Oxide and Reduced Graphene Oxide

ECS Meeting Abstracts ◽

10.1149/ma2015-02/10/606 ◽

2015 ◽

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

X Ray Diffraction ◽

X Ray ◽

Reduced Graphene

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Controllable Synthesis of Zn2GeO4Nanorods for Photocatalytic Reduction of Aqueous Cr(VI) and Oxidation of Organic Pollutants

Journal of Nanotechnology ◽

10.1155/2015/241841 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Jin Liu ◽

Xiaodan Jin ◽

Yurong Shi ◽

Mingming Qiao

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Optical Properties ◽

Organic Pollutants ◽

Diffuse Reflectance ◽

X Ray Diffraction ◽

Controllable Synthesis ◽

Solution Ph ◽

Photocatalytic Ability ◽

X Ray

Zn2GeO4nanorods were successfully synthesized by a simple hydrothermal method. The composition, morphology, and optical properties of as-synthesized Zn2GeO4samples were characterized by X-ray diffraction, scan electron microscopy, and UV-vis diffuse reflectance spectra. The photocatalytic properties of Zn2GeO4nanorods were evaluated by the reduction of Cr(VI) and oxidation of organic pollutants in aqueous solution. The effects of solution pH on Cr(VI) reduction by Zn2GeO4nanorods were studied in detail. The results indicated that the efficiency of Cr(VI) reduction was highest at pH 5.96. Moreover, Zn2GeO4nanorods also showed excellent photocatalytic ability for the oxidation of organic pollutants such as rhodamine B and 4-nitrophenol.

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Synthesis of Graphene Oxide Enhanced Agar Composites: A Biocompatible Photo-catalyst for Degradation of Organic Dyes

American Journal of Undergraduate Research ◽

10.33697/ajur.2020.025 ◽

2020 ◽

Vol 17 (3) ◽

pp. 29-40

Author(s):

Shreyas Dindorkar ◽

Jaymin Mistry ◽

Jayesh Hire ◽

Khushi Jain ◽

Nandini Khona ◽

...

Keyword(s):

Methylene Blue ◽

Graphene Oxide ◽

Rate Constant ◽

Reaction System ◽

Solar Irradiation ◽

Blue Dye ◽

Methylene Blue Dye ◽

X Ray Diffraction ◽

X Ray ◽

Tauc Plot

Herein we report the synthesis of graphene oxide-based agar composites using a solution casting method. Graphene oxide was synthesized by modified Hummer’s method and was characterized using X-ray diffraction (XRD) and Raman spectroscopy. The graphene oxide-based agar composites were characterized using X-ray diffraction (XRD) and UV-visible spectroscopy. Optical band gap obtained from the Tauc plot showed that the composites could be used in the photodegradation of dyes. The synthesized composite material was checked for its practical applicability in the degradation of methylene blue dye under solar irradiation; with an increase in the concentration of graphene oxide, catalyst, and H2O2, the rate constant increases. The rate constant was found to be inversely proportional to the concentration of methylene blue dye. Dosage of graphene oxide was found to be the most prominent factor in increasing the rate of photodegradation. It is clear from the data for the reaction system that the degradation reaction follows pseudo-first-order kinetics. Keywords: Composites; Ultra-sonication; Photodegradation; Methylene Blue; XRD; Graphene Oxide; Kinetics; Biocompatibility

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Hydrothermal Preparation of Ag/TiO2/GO Nanocomposites with Ammonia-Treated Graphene Oxide for Enhanced Conductivity

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18802 ◽

2020 ◽

Vol 20 (11) ◽

pp. 6698-6702

Author(s):

Bo-Kyung Choi ◽

Woong-Ki Choi ◽

Jong-Hyun Park ◽

Soo-Jin Park ◽

Min-Kang Seo

Keyword(s):

Electron Microscopy ◽

Nitrogen Doping ◽

Diffuse Reflectance ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

Hydrothermal Preparation ◽

Facile Hydrothermal Method ◽

X Ray ◽

Transmission Electron ◽

Enhanced Conductivity

In this study, Ag/TiO2/GO nanocomposites were successfully fabricated by a facile hydrothermal method. Nitrogen-doped GO was prepared using ammonia treatment to improve its conductivity. The Ag/TiO2/GO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), zeta potential, and photoluminescence spectroscopy (PL). A homogeneous dispersion of Ag/TiO2 nanoparticles was shown on the surface of GO. Increasing the nitrogen doping concentration increased hydrophilicity, thereby improving the conductivity of Ag/TiO2/GO nanocomposites.

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Synthesis of SnS2/SnO2 Nanocomposite for Visible Light-Driven Photocatalytic Reduction of Aqueous Cr(VI)

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.538.46 ◽

2013 ◽

Vol 538 ◽

pp. 46-49 ◽

Cited By ~ 2

Author(s):

Min Yang ◽

Yong Cai Zhang ◽

Wei Min Dai ◽

Ke Hang ◽

Yue Quan Pan

Keyword(s):

Visible Light ◽

Diffuse Reflectance ◽

Reflectance Spectrum ◽

Sno2 Nanoparticles ◽

Diffuse Reflectance Spectrum ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Visible Light Driven

SnS2/SnO2 nanocomposite was synthesized by a simple in situ hydrothermal oxidation route, and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy and UV-vis diffuse reflectance spectrum. The as-synthesized SnS2/SnO2 nanocomposite displayed much superior photocatalytic activity to SnS2 and SnO2 nanoparticles in the reduction of aqueous Cr(VI) under visible light (λ > 420 nm) irradiation.

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