scholarly journals Reduced Graphene Oxide (rGO)-Loaded Metal-Oxide Nanofiber Gas Sensors: An Overview

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1352
Author(s):  
Sanjit Manohar Majhi ◽  
Ali Mirzaei ◽  
Hyoun Woo Kim ◽  
Sang Sub Kim
Keyword(s):  
Graphene Oxide ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Reduced Graphene Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Reduced Form ◽  
Sensing Applications ◽  
Reduced Graphene ◽  
Electrospinning Method

Reduced graphene oxide (rGO) is a reduced form of graphene oxide used extensively in gas sensing applications. On the other hand, in its pristine form, graphene has shortages and is generally utilized in combination with other metal oxides to improve gas sensing capabilities. There are different ways of adding rGO to different metal oxides with various morphologies. This study focuses on rGO-loaded metal oxide nanofiber (NF) synthesized using an electrospinning method. Different amounts of rGO were added to the metal oxide precursors, and after electrospinning, the gas response is enhanced through different sensing mechanisms. This review paper discusses rGO-loaded metal oxide NFs gas sensors.

Reduced graphene oxide/ZnO nanocomposite for application in chemical gas sensors

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34225-34232 ◽  
Author(s):  
Vardan Galstyan ◽  
Elisabetta Comini ◽  
Iskandar Kholmanov ◽  
Guido Faglia ◽  
Giorgio Sberveglieri
Keyword(s):  
Graphene Oxide ◽  
Metal Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Oxide Nanostructures ◽  
Reduced Graphene ◽  
Gas Sensing Properties ◽  
Metal Oxide Nanostructures

Coupling of graphene-based materials with metal oxide nanostructures is an effective way to obtain composites with improved gas sensing properties.

Reduced Graphene Oxide–TiO2 Nanotube Composite: Comprehensive Study for Gas-Sensing Applications

2018 ◽  
Vol 1 (12) ◽  
pp. 7098-7105 ◽  
Author(s):  
Vardan Galstyan ◽  
Andrea Ponzoni ◽  
Iskandar Kholmanov ◽  
Marta M. Natile ◽  
Elisabetta Comini ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensing ◽  
Tio2 Nanotube ◽  
Sensing Applications ◽  
Reduced Graphene ◽  
Comprehensive Study

scholarly journals Metal-organic framework-derived metal oxide nanoparticles@reduced graphene oxide composites as cathode materials for rechargeable aluminium-ion batteries

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kaiqiang Zhang ◽  
Tae Hyung Lee ◽  
Joo Hwan Cha ◽  
Ho Won Jang ◽  
Ji-Won Choi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Reduced Graphene Oxide ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Great Success ◽  
Discharge Process ◽  
Aluminium Ion ◽  
Reduced Graphene

Abstract The use of metal oxides as electrode materials has seen great success in lithium-ion batteries. However, this type of electrode materials has been regarded as an improper option for rechargeable aluminium-ion batteries (AIBs) in comparison with sulfides and selenides, and has, thus, been nearly abandoned. Here, we demonstrate the suitability of metal oxides as cathode materials of AIBs, exhibiting high electrochemical activities toward Al-ion storage. We designed economical metal-oxide cathodes (Co3O4@reduced graphene oxide (rGO), Fe2O3@rGO, and CoFe2O4@rGO) for AIBs. The Co3O4@rGO displayed superior electrochemical properties, regarding both capacity and lifespan, to the current state-of-the-art cathode material reported by scientific literature. Furthermore, the CoFe2O4@rGO exhibits rational electrochemical capacities and an extremely stable charge/discharge process with an excellent Coulombic efficiency of 99.6%. The proposed study expects to stimulate researchers to focus on the overlooked metal oxides as competitive cathode materials for high performance AIBs.

scholarly journals Reduced graphene oxide and graphene composite materials for improved gas sensing at low temperature

2014 ◽  
Vol 173 ◽  
pp. 403-414 ◽  
Author(s):  
Alexander Zöpfl ◽  
Michael-Maximilian Lemberger ◽  
Matthias König ◽  
Guenther Ruhl ◽  
Frank-Michael Matysik ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Principal Component ◽  
High Signal ◽  
Response Patterns ◽  
Reduced Graphene ◽  
Different Response ◽  
Chemiresistive Gas Sensors

Reduced graphene oxide (rGO) was investigated as a material for use in chemiresistive gas sensors. The carbon nanomaterial was transferred onto a silicon wafer with interdigital gold electrodes. Spin coating turned out to be the most reliable transfer technique, resulting in consistent rGO layers of reproducible quality. Fast changes in the electrical resistance at a low operating temperature of 85 °C could be detected for the gases NO2, CH4 and H2. Especially upon adsorption of NO2 the high signal changes allowed a minimum detection of 0.3 ppm (S/N = 3). To overcome the poor selectivity, rGO was chemically functionalized with octadecylamine, or modified by doping with metal nanoparticles such as Pd and Pt, and also metal oxides such as MnO2, and TiO2. The different response patterns for six different materials allowed the discrimination of all of the test gases by pattern recognition based on principal component analysis.

scholarly journals Synthesis of Cu2O-Modified Reduced Graphene Oxide for NO2 Sensors

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 1958
Author(s):  
Manman Huang ◽  
Yanyan Wang ◽  
Shuyang Ying ◽  
Zhekun Wu ◽  
Weixiao Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensing ◽  
Thermal Reduction ◽  
Oxide Semiconductors ◽  
Research Attention ◽  
Sensing Applications ◽  
Reduced Graphene ◽  
Significant Research ◽  
P Type

Nowadays, metal oxide semiconductors (MOS)-reduced graphene oxide (rGO) nanocomposites have attracted significant research attention for gas sensing applications. Herein, a novel composite material is synthesized by combining two p-type semiconductors, i.e., Cu2O and rGO, and a p-p-type gas sensor is assembled for NO2 detection. Briefly, polypyrrole-coated cuprous oxide nanowires (PPy/Cu2O) are prepared via hydrothermal method and combined with graphene oxide (GO). Then, the nanocomposite (rGO/PPy/Cu2O) is obtained by using high-temperature thermal reduction under Ar atmosphere. The results reveal that the as-prepared rGO/PPy/Cu2O nanocomposite exhibits a maximum NO2 response of 42.5% and is capable of detecting NO2 at a low concentration of 200 ppb. Overall, the as-prepared rGO/PPy/Cu2O nanocomposite demonstrates excellent sensitivity, reversibility, repeatability, and selectivity for NO2 sensing applications.

scholarly journals Supramolecular Functionalized Pristine Graphene Utilizing a Bio-Compatible Stabilizer towards Ultra-Sensitive Ammonia Detection

2021 ◽  
Vol 6 (1) ◽  
pp. 14
Author(s):  
Shirong Huang ◽  
Luis Antonio Panes-Ruiz ◽  
Alexander Croy ◽  
Leif Riemenschneider ◽  
Vyacheslav Khavrus ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Low Cost ◽  
Pristine Graphene ◽  
Reduced Graphene ◽  
Ammonia Detection ◽  
Sensing Performance

Recently, graphene has attracted intensive attention in the gas sensing field due to its high electrical conductivity as well as large specific surface areas. Lots of graphene-based gas sensors have been reported with excellent gas sensing performance. However, the sensing element materials for most of the above sensors actually consist of a reduced graphene oxide (rGO) derivative rather than pristine graphene, such as rGO, rGO/metal particle, rGO/polymers, etc. Complex chemical oxidation and reduction are usually involved for the preparation of reduced graphene oxide derivatives. Even though there are some pristine graphene-based gas sensors synthesizing with the approaches of chemical vapor deposition (CVD) or mechanical cleavage, the high cost of the set-up or the low productivity cannot decrease the cost of the practical sensors. In this work, we develop pristine graphene-based gas sensors utilizing flavin monocleotide sodium salt (FMNS) toward ultra-sensitive ammonia detection. The sensor has 3% response upon exposure to 10 ppm NH3 and a limit of detection of 1.6 ppm at room temperature and shows a good recovery. Raman, UV–Vis, FT-IR spectra, as well as scanning electron microscope (SEM) measurements are employed to characterize the quality of the graphene flakes, indicating a good structural quality of graphene with few defects. The effects of the concentration of graphene dispersion functionalized by FMNS on the sensing performance towards ammonia sensing were also investigated. The process is very mild, environmentally friendly, and low cost. We believe this work may pave a path to design a high-performance gas sensor with low cost and boost the application of graphene for sensing.

scholarly journals Promising antimicrobial and antibiofilm activities of reduced graphene oxide-metal oxide (RGO-NiO, RGO-AgO, and RGO-ZnO) nanocomposites

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 25961-25975
Author(s):  
Sherif Elbasuney ◽  
Gharieb S. El-Sayyad ◽  
Hesham Tantawy ◽  
Amr H. Hashem
Keyword(s):  
Graphene Oxide ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Reduced Graphene Oxide ◽  
Antimicrobial Agents ◽  
Antimicrobial Potential ◽  
Reduced Graphene ◽  
Microbial Infections

Microbial infections are considered one of the most dangerous infections for humans due to their resistance to most antimicrobial agents. Nanocomposites-based reduced graphene oxide doped with metal oxides possesses a promising antimicrobial potential.

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