scholarly journals Recent Advances in Graphene-Based Humidity Sensors

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 422 ◽  
Author(s):  
Chao Lv ◽  
Cun Hu ◽  
Junhong Luo ◽  
Shuai Liu ◽  
Yan Qiao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Graphene Quantum Dots ◽  
Pristine Graphene ◽  
High Electron ◽  
Humidity Sensors ◽  
Industrial Processing ◽  
Surface Areas ◽  
Recent Advances ◽  
Metal Metal

Humidity sensors are a common, but important type of sensors in our daily life and industrial processing. Graphene and graphene-based materials have shown great potential for detecting humidity due to their ultrahigh specific surface areas, extremely high electron mobility at room temperature, and low electrical noise due to the quality of its crystal lattice and its very high electrical conductivity. However, there are still no specific reviews on the progresses of graphene-based humidity sensors. This review focuses on the recent advances in graphene-based humidity sensors, starting from an introduction on the preparation and properties of graphene materials and the sensing mechanisms of seven types of commonly studied graphene-based humidity sensors, and mainly summarizes the recent advances in the preparation and performance of humidity sensors based on pristine graphene, graphene oxide, reduced graphene oxide, graphene quantum dots, and a wide variety of graphene based composite materials, including chemical modification, polymer, metal, metal oxide, and other 2D materials. The remaining challenges along with future trends in high-performance graphene-based humidity sensors are also discussed.

scholarly journals Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jeongpil Kim ◽  
Jeong-Hyun Eum ◽  
Junhyeok Kang ◽  
Ohchan Kwon ◽  
Hansung Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pore Structure ◽  
Specific Capacitance ◽  
Surface Area ◽  
Thermal Annealing ◽  
High Performance ◽  
Annealing Process ◽  
Supercapacitor Electrode ◽  
Simple Method ◽  
Surface Areas

AbstractHerein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.

Hierarchical TiO2−x imbedded with graphene quantum dots for high-performance lithium storage

2018 ◽  
Vol 54 (12) ◽  
pp. 1413-1416 ◽  
Author(s):  
Weifeng Zhang ◽  
Tan Xu ◽  
Zhenwei Liu ◽  
Nae-Lih Wu ◽  
Mingdeng Wei
Keyword(s):  
High Performance ◽  
Graphene Quantum Dots ◽  
Rate Capability ◽  
Reversible Capacity ◽  
Ion Diffusion ◽  
Lithium Storage ◽  
High Reversible Capacity ◽  
Surface Areas ◽  
Electron Transportation ◽  
Specific Surface Areas

TiO2−x/GQDs with large specific surface areas and better electrical conductivity facilitate ion diffusion and electron transportation, leading to a high reversible capacity and a superior rate capability.

Facile Synthetic Method for Pristine Graphene Quantum Dots and Graphene Oxide Quantum Dots: Origin of Blue and Green Luminescence

2013 ◽  
Vol 25 (27) ◽  
pp. 3657-3662 ◽  
Author(s):  
Fei Liu ◽  
Min-Ho Jang ◽  
Hyun Dong Ha ◽  
Je-Hyung Kim ◽  
Yong-Hoon Cho ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Graphene Quantum Dots ◽  
Pristine Graphene ◽  
Synthetic Method ◽  
Green Luminescence ◽  
Graphene Oxide Quantum Dots

scholarly journals Recent Progress in Electrochemical Detection of Human Papillomavirus (HPV) via Graphene-Based Nanosensors

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Seyyed Mojtaba Mousavi ◽  
Gity Behbudi ◽  
Seyyed Alireza Hashemi ◽  
Aziz Babapoor ◽  
Wei-Hung Chiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Detection ◽  
High Performance ◽  
Recent Progress ◽  
Graphene Quantum Dots ◽  
Human Papillomaviruses ◽  
Human Immune System ◽  
Hpv Dna ◽  
Sexually Transmitted ◽  
Detection Systems

In the present study, applications of advanced nanomaterials such as graphene oxide (GO), reduced graphene oxide (rGO), and graphene quantum dots (GQDs) as leading and potential candidates toward treating the human papillomaviruses (HPVs) were investigated. In this matter, a comprehensive summary of the formation of GO, rGO, and GQDs will be reported in detail. Continuous efforts have been exerted to develop high-performance biosensors and electrochemical detection systems toward accurate detection of HPV using novel routes. This review paper showed that HPVs appeared in different types and species. These HPVs have many complications on humans, and thus, there are different ways that a person could be exposed to them. Meanwhile, several routes of transmitting the HPVs to human cells are discussed too. Indeed, sexually transmitted diseases could be easily infected by HPVs, although the human immune system can also be boosted to treat this dangerous virus effectively. Some of the HPVs such as HPV-16 and HPV-18 are so dangerous, and HPV DNA could be detected in several vertical cancers. Herein, we reported and summarized some recent progress in electrochemical detection of HPVs using graphene-based nanosensors.

scholarly journals Synthesis and Characterization of Graphene Oxide and Reduced Graphene Oxide Composites with Inorganic Nanoparticles for Biomedical Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1846
Author(s):  
Joanna Jagiełło ◽  
Adrian Chlanda ◽  
Magdalena Baran ◽  
Marcin Gwiazda ◽  
Ludwika Lipińska
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Biomedical Applications ◽  
Active Surface ◽  
Biological Properties ◽  
Inorganic Nanoparticles ◽  
Pristine Graphene ◽  
Spectroscopic Techniques ◽  
Surface Areas ◽  
Reduced Graphene

Graphene oxide (GO) and reduced graphene oxide (RGO), due to their large active surface areas, can serve as a platform for biological molecule adhesion (both organic and inorganic). In this work we described methods of preparing composites consisting of GO and RGO and inorganic nanoparticles of specified biological properties: nanoAg, nanoAu, nanoTiO2 and nanoAg2O. The idea of this work was to introduce effective methods of production of these composites that could be used for future biomedical applications such as antibiotics, tissue regeneration, anticancer therapy, or bioimaging. In order to characterize the pristine graphene materials and resulting composites, we used spectroscopic techniques: XPS and Raman, microscopic techniques: SEM with and AFM, followed by X-Ray diffraction. We obtained volumetric composites of flake graphene and Ag, Au, Ag2O, and TiO2 nanoparticles; moreover, Ag nanoparticles were obtained using three different approaches.

scholarly journals High sensitivity flexible Lamb-wave humidity sensors with a graphene oxide sensing layer

Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7430-7436 ◽  
Author(s):  
Weipeng Xuan ◽  
Xingli He ◽  
Jinkai Chen ◽  
Wenbo Wang ◽  
Xiaozhi Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lamb Wave ◽  
High Performance ◽  
High Sensitivity ◽  
Humidity Sensors ◽  
Wave Sensors

This paper reports high performance flexible Lamb wave sensors with a graphene oxide sensing layer.

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