scholarly journals Comparison between Linear and Branched Polyethylenimine and Reduced Graphene Oxide Coatings as a Capture Layer for Micro Resonant CO2 Gas Concentration Sensors

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1824 ◽  
Author(s):  
Alberto Prud’homme ◽  
Frederic Nabki
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microelectromechanical Systems ◽  
Co2 Concentration ◽  
Superior Performance ◽  
Quartz Crystals ◽  
Mems Resonator ◽  
Reduced Graphene ◽  
Branched Polyethylenimine ◽  
Linear Polyethylenimine

The comparison between potential coatings for the measurement of CO2 concentration through the frequency shift in micro-resonators is presented. The polymers evaluated are linear polyethylenimine, branched polyethylenimine and reduced graphene oxide (rGO) by microwave reduction with polyethylenimine. The characterization of the coatings was made by using 6 MHz gold-plated quartz crystals, and a proof-of-concept sensor is shown with a diaphragm electrostatic microelectromechanical systems (MEMS) resonator. The methods of producing the solutions of the polymers deposited onto the quartz crystals are presented. A CO2 concentration range from 0.05% to 1% was dissolved in air and humidity level were controlled and evaluated. Linear polyethylenimine showed superior performance with a reaction time obtained for stabilization after the concentration increase of 345 s, while the time for recovery was of 126 s, with a maximum frequency deviation of 33.6 Hz for an in-air CO2 concentration of 0.1%.

Silver nanoparticles modified reduced graphene oxide wrapped Ag3PO4/TiO2 visible-light-active photocatalysts with superior performance

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 43697-43706 ◽  
Author(s):  
Can Cui ◽  
Yiwei Qiu ◽  
Haihua Hu ◽  
Ni Ma ◽  
Shuang Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Charge Separation ◽  
Rational Design ◽  
Superior Performance ◽  
Reduced Graphene ◽  
Visible Light Active

Rational design of a novel Ag3PO4/TiO2/Ag-rGO photocatalyst with both electron and hole pathways for charge separation.

Reduced graphene oxide grafted by the polymer of polybromopyrroles for nanocomposites with superior performance for supercapacitors

2015 ◽  
Vol 3 (42) ◽  
pp. 21257-21268 ◽  
Author(s):  
Shouzhi Wang ◽  
Ligang Gai ◽  
Haihui Jiang ◽  
Zhenzhen Guo ◽  
Nana Bai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Superior Performance ◽  
Reduced Graphene

An integrated structure has been designed by grafting the polymer of polybromopyrroles (PPBP) onto reduced graphene oxide (RGO) to produce RGO/PPBP nanocomposites with superior electrochemical performance for supercapacitors.

Improvement of polyacrylonitrile ultrafiltration membranes' properties using decane-functionalized reduced graphene oxide nanoparticles

2016 ◽  
Vol 16 (5) ◽  
pp. 1378-1387 ◽  
Author(s):  
Reyhaneh Kaveh ◽  
Zahra Shariatinia ◽  
Ahmad Arefazar
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Flux ◽  
Superior Performance ◽  
Oxide Nanoparticles ◽  
Ultrafiltration Membranes ◽  
Reduced Graphene ◽  
Maximum Water ◽  
Scanning Electron

The effect of decane-functionalized reduced graphene oxide (decane-rGO) was studied on the performance of polyacrylonitrile (PAN) ultrafiltration membranes. The results showed that the decane-rGO/PAN membranes had greater salt rejections relative to their corresponding GO/PAN membranes, confirming superior performance of modified decane-rGO particles. Also, the membrane with 0.2 wt% decane-rGO exhibited maximum water flux and appropriate salt rejection. The field-emission scanning electron microscopy (FE-SEM) micrographs illustrated that the sponge-like pores in the pristine PAN membrane were changed to a finger-like structure in the membrane containing up to 0.2 wt% of decane-rGO and the vertical holes were converted to horizontal holes by further increasing the decane-rGO concentration in the polymer matrix.

Facile one-pot synthesis of a NiMoO4/reduced graphene oxide composite as a pseudocapacitor with superior performance

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 69627-69633 ◽  
Author(s):  
Yongfeng Li ◽  
Jianming Jian ◽  
Yun Fan ◽  
Hui Wang ◽  
Lin Yu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Superior Performance ◽  
One Pot ◽  
Oxide Composite ◽  
One Pot Synthesis ◽  
Reduced Graphene

A hybrid NiMoO4/rGO composite was successfully synthesized by a facile one-pot hydrothermal method.

scholarly journals Rational design of reduced graphene oxide for superior performance of supercapacitor electrodes

Carbon ◽  
2017 ◽  
Vol 111 ◽  
pp. 774-781 ◽  
Author(s):  
S. Rasul ◽  
A. Alazmi ◽  
K. Jaouen ◽  
M.N. Hedhili ◽  
P.M.F.J. Costa
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Rational Design ◽  
Superior Performance ◽  
Reduced Graphene

scholarly journals Enhanced Performance of GCE/N-Reduced Graphene Oxide-Au Nanocomposite in Dopamine Sensing

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 41 ◽  
Author(s):  
Minta ◽  
Wiench ◽  
Gryglewicz
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Sensors ◽  
Limit Of Detection ◽  
Superior Performance ◽  
Homogeneous Distribution ◽  
Hydrothermal Conditions ◽  
Reduced Graphene ◽  
Working Parameters

The reduced graphene oxide (rGO) and nitrogen-reduced graphene oxide (N-rGO) were electrochemically coated with gold nanoparticles and compared as the modifier of a glassy carbon electrode (GCE) for dopamine (DA) electrochemical sensors. The rGO and N-rGO were prepared by reduction of graphene oxide (GO) under hydrothermal conditions. Urea was applied as a nitrogen dopant. The modified GCEs were tested as working electrodes in the electrochemical DA detection in the presence of ascorbic and uric acids. Initially, the working parameters of sensors in a pure dopamine solution were determined. The GCE/N-rGO-Au electrode exhibited a lower limit of detection compared with the GCE/rGO-Au (385 vs. 700 nM). Both sensors had a wide linear range of 1-100 µM and high sensitivity of 0.78 µA/µM for GCE/N-rGO-Au and 1.78 µA/µM for GCE/rGO-Au. The presence of ascorbic and uric acids in the solution resulted in a decrease in the intensity of DA oxidation peak, maintaining acceptable limit of detection. This study showed that the surface modification of the graphene materials with gold nanoparticles allows to obtain satisfactory working parameters of DA sensors. The GCE/N-rGO-Au demonstrated the superior performance in DA sensing due to a homogeneous distribution of gold nanoparticles on the surface of the N-doped graphene material.

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