scholarly journals High Performance Hybrid Graphene Nano Filters as a Total dissolved solid remover

2021 ◽  
Vol 3 (2) ◽  
pp. 177-181
Author(s):  
Renuka Sharma ◽  
Pratyush Shekhar
Keyword(s):  
Graphene Oxide ◽  
Metal Oxides ◽  
High Performance ◽  
Lattice Structure ◽  
Single Layer ◽  
Inorganic Membrane ◽  
Wide Range ◽  
Graphene Derivatives ◽  
Ph Level ◽  
Total Dissolved Solid

Graphene, a single-layer carbon sheet with its distinctive two-dimensional (2D) single-atomic-thick sp2 hybridized hexagonal packed lattice structure which is nearly friction less with high chemical inertness, and pliability which can be manufactured sustainably in great amounts with less expense, has shown many unique properties, Graphene has attracted tremendous research interest in recent years, owing to its exceptional properties. The scaled-up and reliable production of graphene derivatives, such as graphene oxide (GO) and reduced graphene oxide (GO), offers a wide range of possibilities to produce nano-filters containing graphene membrane which is capable to remove ninety percent of the heavy contaminants from different sources of water and to reduce the level of total dissolved solids, salinity, and neutralizes the pH level further inorganic membrane used in synergism with graphene oxide shows improved efficiency and reduction in cost of production of separation membranes. In this review, we demonstrated real world application of graphene, Fabricated with Several Metal Oxides in synergism to illustrate enhanced photocatalysis properties, Flexural strength and anti-fouling characteristics of the material in comparisons to conventional membrane, photocatalytic metal oxides nanoparticles such as Titania TiO2, Zirconia ZrO2, Alumina Al2O3, and Silica SiO2 functions in the presence of Multiple Spectrums of Light by absorbing photons and releasing Oxygen Radical which degrades harmful water pollutants into less harmful substances.

A BRIEF REVIEW ON GRAPHENE-NANOPARTICLE COMPOSITES

COSMOS ◽  
2010 ◽  
Vol 06 (02) ◽  
pp. 159-166 ◽  
Author(s):  
XIAO HUANG ◽  
FREDDY BOEY ◽  
HUA ZHANG
Keyword(s):  
Graphene Oxide ◽  
Surface Defects ◽  
Single Layer ◽  
Mechanical And Thermal Properties ◽  
Photovoltaic Devices ◽  
Reduced Graphene ◽  
Wide Range ◽  
Graphene Derivatives ◽  
Enhanced Properties ◽  
Nanoparticle Composites

Graphene, a single layer of hexagonal packed carbon atoms, has attracted increasing attention in recent years. Because of its exceptional electronic, optical, mechanical, and thermal properties, graphene has shown great promises in a wide range of applications. Graphene derivatives, e.g. graphene oxide (GO) and reduced graphene oxide (rGO) sheets, possess surface defects and oxygen functional groups, which make them ideal templates for synthesis of metal and semiconductor nanoparticles (NPs). Enhanced properties are expected in these graphene–NP composites, which arise from the synergic effect of the GO/rGO sheets and the anchored NPs. In this review, after a brief introduction on the properties and synthesis of graphene, we will discuss the fabrication methods of graphene–metal NP and graphene–semiconductor NP composites, as well as their related applications in catalysis, photovoltaic devices, supercapacitors, and so on.

Well-Aligned Graphene Oxide Nanosheets Decorated with Zinc Oxide Nanocrystals for High Performance Photocatalytic Application

2015 ◽  
Vol 14 (03) ◽  
pp. 1550007 ◽  
Author(s):  
K. Kaviyarasu ◽  
C. Maria Magdalane ◽  
E. Manikandan ◽  
M. Jayachandran ◽  
R. Ladchumananandasivam ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
High Performance ◽  
Chemical Reduction ◽  
Visible Region ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Graphene Oxides ◽  
X Ray ◽  
Nanoscale Structures

Graphene oxide (GO) nanosheets modified with zinc oxide nanocrystals were achieved by a green wet-chemical approach. As-obtained products were characterized by XRD, Raman spectra, XPS, HR-TEM, EDS, PL and Photocatalytic studies. XRD studies indicate that the GO nanosheet have the same crystal structure found in hexagonal form of ZnO . The enhanced Raman spectrum of 2D bands confirmed formation of single layer graphene oxides. The gradual photocatalytic reduction of the GO nanosheet in the GO : ZnO suspension of ethanol was studied by using X-ray photoelectron (XPS) spectroscopy. The nanoscale structures were observed and confirmed using high resolution transmission electron microscopy (HR-TEM). The evolution of the elemental composition, especially the various numbers of layers were determined from energy dispersive X-ray spectra (EDS). PL properties of GO : ZnO nanosheet were found to be dependent on the growth condition and the resultant morphology revealed that GO nanosheet were highly transparent in the visible region. The photocatalytic performance of GO : ZnO nanocomposites was performed under UV irradiation. Therefore, the ZnO nanocrystals in the GO : ZnO composite could be applied in gradual chemical reduction and consequently tuning the electrical conductivity of the graphene oxide nanosheet.

scholarly journals Template-assisted synthesis of NiCoO2 nanocages/reduced graphene oxide composites as high-performance electrodes for supercapacitors

RSC Advances ◽  
2018 ◽  
Vol 8 (30) ◽  
pp. 16902-16909 ◽  
Author(s):  
Xiao-Hui Guan ◽  
Mu Li ◽  
Hai-Zhen Zhang ◽  
Liu Yang ◽  
Guang-Sheng Wang
Keyword(s):  
Graphene Oxide ◽  
Metal Oxides ◽  
High Performance ◽  
Reduced Graphene ◽  
Binary Metal Oxides ◽  
Cubic Structure ◽  
Oxide Composites ◽  
Template Assisted Synthesis ◽  
Electrodes For Supercapacitors ◽  
Coordinating Etching And Precipitating

Here we reported a coordinating etching and precipitating method to synthesize a complex binary metal oxides hollow cubic structure.

scholarly journals Bidirectional Angle-Tolerant Polarization-Tuned Filtering and Wide-Range Refractive Index Sensing Based on Metal Film Coated Nanograting

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Wenli Cui ◽  
Qiannan Wu ◽  
Bo Chen ◽  
Xufeng Li ◽  
Xiaolin Luo ◽  
...  
Keyword(s):  
Refractive Index ◽  
Metal Film ◽  
High Performance ◽  
Incident Angle ◽  
Single Layer ◽  
Transverse Magnetic ◽  
Photonic Devices ◽  
Biomedical Sensors ◽  
Dual Channel ◽  
Wide Range

The miniaturization and integration of photonic devices are new requirements in the fast-growing optics field. In this paper, we focus on a feature-rich sub-wavelength nanograting-coated single-layer metal film. The numerical results show that the reflection behaviors of this proposed structure can realize bidirectional dual-channel ultra-narrowband polarized filtering and bidirectional wavelength-modulated sensing in a wide refractive index (RI) range from 1.0 to 1.4 for incident angle of 10° with transverse-magnetic (TM) polarized illumination at wavelengths between 550 nm to 1500 nm. Moreover, the bidirectional properties of filtering and sensing are not obviously decreased when increasing incident angle from 10° to 30°, and decreasing incident angle from 10° to 0°. The calculated RI sensitivity can be up to 592 nm/RIU with a high figure of merit (FOM) of 179.4 RIU−1. More to the point, this nanograting has a simple structure and is less sensitive to the height and shape of grating ridge, which provides great convenience for the fabrication of devices. The other thing that is going on is that this structure can also realize synchronously tunable color filtering, including green to red, with high color purity in the visible band by choosing the period. The underlying physical mechanism is analyzed in detail, and is primarily attributed to surface plasmon polariton (SPP) resonance and dipole resonance at double plasmon resonance wavelengths. This work has tremendous potential in developing multipurpose and high-performance integrated optical devices such as spectral filters, colored displays and plasmon biomedical sensors.

scholarly journals Micromechanical Process Integration and Material Optimization for High Performance Silicon-Germanium Bolometers

2012 ◽  
Vol 1437 ◽  
Author(s):  
Gunnar B. Malm ◽  
Mohammadreza Kolahdouz ◽  
Fredrik Forsberg ◽  
Niclas Roxhed ◽  
Frank Niklaus
Keyword(s):  
Integrated Circuits ◽  
Silicon Germanium ◽  
High Performance ◽  
Large Scale ◽  
Process Integration ◽  
Low Frequency ◽  
Single Layer ◽  
Sige Layer ◽  
Frequency Noise ◽  
Wide Range

ABSTRACTSemiconductor-based thermistors are very attractive sensor materials for uncooled thermal infrared (IR) bolometers. Very large scale heterogeneous integration of MEMS is an emerging technology that allows the integration of epitaxially grown, high-performance IR bolometer thermistor materials with pre-processed CMOS-based integrated circuits for the sensor read-out. Thermistor materials based on alternating silicon (Si) and silicon-germanium (SiGe) epitaxial layers have been demonstrated and their performance is continuously increasing. Compared to a single layer of silicon or SiGe, the temperature coefficient of resistance (TCR) can be strongly enhanced to about 3 %/K, by using thin alternating layers. In this paper we report on the optimization of alternating Si/SiGe layers by advanced physically based simulations, including quantum mechanical corrections. Our simulation framework provides reliable predictions for a wide range of SiGe layer compositions, including concentration gradients. Finally, our SiGe thermistor layers have been evaluated in terms of low-frequency noise performance, in order to optimize the bolometer detectivity.

scholarly journals Alkali Reduction of Graphene Oxide in Molten Halide Salts: Production of Corrugated Graphene Derivatives for High-Performance Supercapacitors

ACS Nano ◽  
2014 ◽  
Vol 8 (11) ◽  
pp. 11225-11233 ◽  
Author(s):  
Amr M. Abdelkader ◽  
Cristina Vallés ◽  
Adam J. Cooper ◽  
Ian A. Kinloch ◽  
Robert A. W. Dryfe
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Graphene Derivatives ◽  
Halide Salts

scholarly journals Tuning the Nature of N-Based Groups From N-Containing Reduced Graphene Oxide: Enhanced Thermal Stability Using Post-Synthesis Treatments

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1451
Author(s):  
Stefania Sandoval ◽  
Gerard Tobias
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Structural Modifications ◽  
Reduced Graphene ◽  
Wide Range ◽  
Graphene Derivatives ◽  
N Doping ◽  
Post Synthesis ◽  
Pyridinic N

The synthesis of N-containing graphene derivatives by functionalization and doping of graphene oxide (GO) has been widely reported as an alternative to tune both their chemical and physical properties. These materials are of interest for a wide range of applications, including biomedicine, sensors, energy, and catalysis, to name some. Understanding the role of the nature, reactivity, concentration, and distribution of the N-based species, would pave the way towards the design of synthetic routes to obtain improved materials for specific applications. The N-groups can be present either as aliphatic fractions (amides and amines) or becoming part of the planar conjugated lattice (N-doping). Here, we have modified the distribution of N-based moieties present in N-containing RGO samples (prepared by ammonolysis of GO) and evaluated the role of the concentration and nature of the species in the thermal stability of the materials once thermally annealed (500–1050 °C) under inert environments. After these post-synthesis treatments, samples underwent marked structural modifications that include the elimination and/or transformation of N-containing fractions, which might account for the observed enhanced thermal stability. It is remarkable the formation of pyridinic N-oxide species, which role in the properties of N-containing graphene derivatives has been barely reported. The presence of this fraction is found to confer an enhanced thermal stability to the material.

Two-Stepped Synthesis of High Performance Reduced Graphene Oxide Antenna

2018 ◽  
Vol 280 ◽  
pp. 134-141
Author(s):  
M.A. Jamlos ◽  
M.F. Jamlos ◽  
A.H. Ismail
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Layer Structure ◽  
Single Layer ◽  
Wide Band ◽  
Band Frequency ◽  
Reduced Graphene ◽  
Oxygen Group ◽  
High Level

The paper presents a two-stepped technique to synthesize the Reduced Graphene Oxide (RGO). RGO is a single layer structure of carbon without presence of oxygen group with high level of conductivity (3.38 × 105s/m). The synthesized graphene is used on low permittivity substrate to realize high performance RGO microstrip patch antenna. The antenna operates in ultra-wide band frequency range from 2.5 GHz to 12.2 GHz with gains between 5.5dB and 14.5dB. Low profile and small size (90 mm × 45 mm) makes the antenna suitable for integration.

scholarly journals A Review on Graphene’s Light Stabilizing Effects for Reduced Photodegradation of Polymers

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 3
Author(s):  
Samira Karimi ◽  
Emna Helal ◽  
Giovanna Gutierrez ◽  
Nima Moghimian ◽  
Milad Madinehei ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Free Radical ◽  
Lattice Structure ◽  
High Surface ◽  
Hexagonal Lattice ◽  
High Surface Area ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Hydroxyl Groups ◽  
Graphene Derivatives

Graphene, the newest member of the carbon’s family, has proven its efficiency in improving polymers’ resistance against photodegradation, even at low loadings equal to 1 wt% or lower. This protective role involves a multitude of complementary mechanisms associated with graphene’s unique geometry and chemistry. In this review, these mechanisms, taking place during both the initiation and propagation steps of photodegradation, are discussed concerning graphene and graphene derivatives, i.e., graphene oxide (GO) and reduced graphene oxide (rGO). In particular, graphene displays important UV absorption, free radical scavenging, and quenching capabilities thanks to the abundant π-bonds and sp2 carbon sites in its hexagonal lattice structure. The free radical scavenging effect is also partially linked with functional hydroxyl groups on the surface. However, the sp2 sites remain the predominant player, which makes graphene’s antioxidant effect potentially stronger than rGO and GO. Besides, UV screening and oxygen barriers are active protective mechanisms attributed to graphene’s high surface area and 2D geometry. Moreover, the way that graphene, as a nucleating agent, can improve the photostability of polymers, have been explored as well. These include the potential effect of graphene on increasing polymer’s glass transition temperature and crystallinity.

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