scholarly journals Ultra-Sensitive Piezo-Resistive Sensors Constructed with Reduced Graphene Oxide/Polyolefin Elastomer (RGO/POE) Nanofiber Aerogels

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1883 ◽  
Author(s):  
Weibing Zhong ◽  
Haiqing Jiang ◽  
Liyan Yang ◽  
Ashish Yadav ◽  
Xincheng Ding ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Three Dimensional ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Working Pressure ◽  
Nanofiber Composite ◽  
Composite Aerogel ◽  
Polyolefin Elastomer ◽  
Reduced Graphene ◽  
Composite Aerogels

Flexible wearable pressure sensors have received extensive attention in recent years because of the promising application potentials in health management, humanoid robots, and human machine interfaces. Among the many sensory performances, the high sensitivity is an essential requirement for the practical use of flexible sensors. Therefore, numerous research studies are devoted to improving the sensitivity of the flexible pressure sensors. The fiber assemblies are recognized as an ideal substrate for a highly sensitive piezoresistive sensor because its three-dimensional porous structure can be easily compressed and can provide high interconnection possibilities of the conductive component. Moreover, it is expected to achieve high sensitivity by raising the porosity of the fiber assemblies. In this paper, the three-dimensional reduced graphene oxide/polyolefin elastomer (RGO/POE) nanofiber composite aerogels were prepared by chemical reducing the graphene oxide (GO)/POE nanofiber composite aerogels, which were obtained by freeze drying the mixture of the GO aqueous solution and the POE nanofiber suspension. It was found that the volumetric shrinkage of thermoplastic POE nanofibers during the reduction process enhanced the compression mechanical strength of the composite aerogel, while decreasing its sensitivity. Therefore, the composite aerogels with varying POE nanofiber usage were prepared to balance the sensitivity and working pressure range. The results indicated that the composite aerogel with POE nanofiber/RGO proportion of 3:3 was the optimal sample, which exhibits high sensitivity (ca. 223 kPa−1) and working pressure ranging from 0 to 17.7 kPa. In addition, the composite aerogel showed strong stability when it is either compressed with different frequencies or reversibly compressed and released 5000 times.

scholarly journals Flexible pressure sensors with high pressure sensitivity and low detection limit using a unique honeycomb-designed polyimide/reduced graphene oxide composite aerogel

RSC Advances ◽  
2021 ◽  
Vol 11 (19) ◽  
pp. 11760-11770
Author(s):  
Qiang Xu ◽  
Xinhao Chang ◽  
Zhendong Zhu ◽  
Lin Xu ◽  
Xianchun Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Pressure Sensors ◽  
Honeycomb Structure ◽  
Pressure Sensitivity ◽  
Large Aspect Ratio ◽  
Composite Aerogel ◽  
Reduced Graphene ◽  
Flexible Pressure Sensors ◽  
Sensing Performance

The polyimide (PI)/reduced graphene oxide (rGO) aerogel sensors possess unique large aspect ratio honeycomb structure, which exhibits superelastic and excellent sensing performance.

scholarly journals Aerogels Based on Reduced Graphene Oxide/Cellulose Composites: Preparation and Vapour Sensing Abilities

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1729
Author(s):  
Yian Chen ◽  
Petra Pötschke ◽  
Jürgen Pionteck ◽  
Brigitte Voit ◽  
Haisong Qi
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Vapour ◽  
Conductive Filler ◽  
High Sensitivity ◽  
Solubility Parameters ◽  
Urea Solution ◽  
Cellulose Composites ◽  
Reduced Graphene ◽  
Composite Aerogels

This paper reports on the preparation of cellulose/reduced graphene oxide (rGO) aerogels for use as chemical vapour sensors. Cellulose/rGO composite aerogels were prepared by dissolving cellulose and dispersing graphene oxide (GO) in aqueous NaOH/urea solution, followed by an in-situ reduction of GO to reduced GO (rGO) and lyophilisation. The vapour sensing properties of cellulose/rGO composite aerogels were investigated by measuring the change in electrical resistance during cyclic exposure to vapours with varying solubility parameters, namely water, methanol, ethanol, acetone, toluene, tetrahydrofuran (THF), and chloroform. The increase in resistance of aerogels on exposure to vapours is in the range of 7 to 40% with methanol giving the highest response. The sensing signal increases almost linearly with the vapour concentration, as tested for methanol. The resistance changes are caused by the destruction of the conductive filler network due to a combination of swelling of the cellulose matrix and adsorption of vapour molecules on the filler surfaces. This combined mechanism leads to an increased sensing response with increasing conductive filler content. Overall, fast reaction, good reproducibility, high sensitivity, and good differentiation ability between different vapours characterize the detection behaviour of the aerogels.

scholarly journals Graphene Oxide Membrane Immobilized Aptamer as a Highly Selective Hormone Removal

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 229 ◽  
Author(s):  
Siham Chergui ◽  
Khaled Rhili ◽  
Sujittra Poorahong ◽  
Mohamed Siaj
Keyword(s):  
Graphene Oxide ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Stacking Interaction ◽  
Π Stacking ◽  
Reduced Graphene ◽  
Oxide Concentration ◽  
Selective Membrane ◽  
Π Stacking Interaction ◽  
Hormone Analogs

Three-dimensional (3D) reduced graphene oxide (rGO) modified by polyethyleneimine (PEI) was prepared and functionalized by fluorophore-labeled dexamethasone-aptamer (Flu-DEX-apt) via π–π stacking interaction. The rGO/PEI/Flu-DEX-apt was used as a selective membrane for dexamethasone hormone removal from water. The prepared rGO/PEI/Flu-DEX-apt membranes were stable, insoluble, and easily removable from liquid media. The membrane was characterized by Raman spectroscopy, scanning electron spectroscopy, and FTIR spectroscopy. The rGO/PEI/Flu-DEX-apt membrane showed high sensitivity and specificity toward the dexamethasone hormone in the presence of other steroid hormone analogs, such as progesterone, estrone, estradiol, and 19-norethindrone. The fluorescence and UV–visible spectroscopy were used to confirm the membranes performance and the quantification of hormones removal. The resulting data clearly show that the graphene oxide concentration influence the aptamers and analytes interaction (π–π stacking interaction). It was found that by varying the graphene oxide concentration yields to different porosities of rGO/PEI/Flu-DEX-apt membranes affects the adsorption recovery rate, as well as the specificity and selectivity toward the dexamethasone hormone.

Synthesis of nitrogen-doped reduced graphene oxide/cobalt–zinc ferrite composite aerogels with superior compression recovery and electromagnetic wave absorption performance

Nanoscale ◽  
2021 ◽  
Author(s):  
Ruiwen Shu ◽  
Jiabin Zhang ◽  
Yue Wu ◽  
Zongli Wan ◽  
Xiaohui Li
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Zinc Ferrite ◽  
Three Dimensional ◽  
Nitrogen Doped ◽  
Electromagnetic Absorption ◽  
Reduced Graphene ◽  
Composite Aerogels ◽  
Absorption Performance ◽  
Cobalt Zinc Ferrite

Nitrogen-doped reduced graphene oxide/cobalt–zinc ferrite composite aerogels with a three-dimensional porous netlike structure, low density, good compressive strength and recovery, and excellent electromagnetic absorption performance were synthesized.

scholarly journals The utilization of a three-dimensional reduced graphene oxide and montmorillonite composite aerogel as a multifunctional agent for wastewater treatment

RSC Advances ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 4239-4248 ◽  
Author(s):  
Yunyun Zhang ◽  
Xueru Yan ◽  
Yayuan Yan ◽  
Dengjie Chen ◽  
Langhuan Huang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Wastewater Treatment ◽  
Graphene Oxide ◽  
Mechanical Strength ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
High Adsorption ◽  
Composite Aerogel ◽  
Reduced Graphene

A reduced graphene oxide/montmorillonite aerogel has high adsorption and antibacterial activity, and excellent recyclable properties thanks to its outstanding mechanical strength.

Three-dimensional nitrogen and phosphorus co-doped carbon quantum dots/reduced graphene oxide composite aerogels with a hierarchical porous structure as superior electrode materials for supercapacitors

2019 ◽  
Vol 7 (46) ◽  
pp. 26311-26325 ◽  
Author(s):  
Jingying Li ◽  
Xiaoru Yun ◽  
Zhongliang Hu ◽  
Liujiang Xi ◽  
Na Li ◽  
...  
Keyword(s):  
Porous Structure ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Carbon Quantum Dots ◽  
Hierarchical Porous Structure ◽  
Nitrogen And Phosphorus ◽  
Composite Aerogel ◽  
Reduced Graphene ◽  
Hierarchical Porous ◽  
Composite Aerogels

A novel 3D N, P-CQDs/rGO composite aerogel with a hierarchical porous structure is prepared, and excellent supercapacitive properties are achieved.

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