Bio-based graphene/sodium alginate aerogels for strain sensors

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 64056-64064 ◽  
Author(s):  
Xue Yuan ◽  
Yong Wei ◽  
Song Chen ◽  
Pingping Wang ◽  
Lan Liu
Keyword(s):  
Graphene Oxide ◽  
Sodium Alginate ◽  
Mechanical Stability ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Graphene Aerogels

Bio-based graphene aerogels are fabricated with graphene oxide and sodium alginate, showing great potential in flexible strain sensors due to the excellent mechanical stability and high sensitivity to compression and bending deformations.

scholarly journals Hydroplastic foaming of graphene aerogels and artificially intelligent tactile sensors

2020 ◽  
Vol 6 (46) ◽  
pp. eabd4045
Author(s):  
Kai Pang ◽  
Xian Song ◽  
Zhen Xu ◽  
Xiaoting Liu ◽  
Yingjun Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Mechanical Stability ◽  
Bubble Formation ◽  
Tactile Sensors ◽  
Graphene Aerogel ◽  
Precision Control ◽  
Direct Foaming ◽  
Graphene Aerogels ◽  
Cellular Wall ◽  
The Ideal

Direct foaming from solids is the most efficient method to fabricate porous materials. However, the ideal foaming fails to prepare aerogel of nanoparticles because the plasticity of their solids is denied by the overwhelming interface interactions. Here, we invent a hydroplastic foaming method to directly convert graphene oxide solids into aerogel bulks and microarrays, replacing the prevalent freezing method. The water intercalation plasticizes graphene oxide solids and enables direct foaming instead of catastrophic fragmentation. The bubble formation follows a general crystallization rule and allows nanometer-precision control of cellular wall thickness down to 8 nm. Bubble clustering generates hyperboloid structures with seamless basal connection and renders graphene aerogels with ultrarobust mechanical stability against extreme deformations. We exploit graphene aerogel to fabricate tactile microarray sensors with ultrasensitivity and ultrastability, achieving a high accuracy (80%) in artificially intelligent touch identification that outperforms human fingers (30%).

U(VI) adsorption by sodium alginate/graphene oxide composite beads in water

2021 ◽  
Author(s):  
Dianxin Li ◽  
Peng Zhang ◽  
Yiqing Yang ◽  
Yuqi Huang ◽  
Tao Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sodium Alginate ◽  
Oxide Composite ◽  
Composite Beads

scholarly journals Giant gauge factor of Van der Waals material based strain sensors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjie Yan ◽  
Huei-Ru Fuh ◽  
Yanhui Lv ◽  
Ke-Qiu Chen ◽  
Tsung-Yin Tsai ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Large Range ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Strain Gauges ◽  
Gauge Factor ◽  
Proof Of Concept ◽  
High Flexibility ◽  
Small Deformations

AbstractThere is an emergent demand for high-flexibility, high-sensitivity and low-power strain gauges capable of sensing small deformations and vibrations in extreme conditions. Enhancing the gauge factor remains one of the greatest challenges for strain sensors. This is typically limited to below 300 and set when the sensor is fabricated. We report a strategy to tune and enhance the gauge factor of strain sensors based on Van der Waals materials by tuning the carrier mobility and concentration through an interplay of piezoelectric and photoelectric effects. For a SnS2 sensor we report a gauge factor up to 3933, and the ability to tune it over a large range, from 23 to 3933. Results from SnS2, GaSe, GeSe, monolayer WSe2, and monolayer MoSe2 sensors suggest that this is a universal phenomenon for Van der Waals semiconductors. We also provide proof of concept demonstrations by detecting vibrations caused by sound and capturing body movements.

scholarly journals Synthesis of Sodium Alginate Graphene Oxide Thin Film for Adsorption Application

2020 ◽  
Vol 596 ◽  
pp. 012020
Author(s):  
Farah Amanina Mohd Zin ◽  
An’amt Mohamed Noor ◽  
Wan Nurshafeera Wan Mohd Nasri ◽  
Nurul Natasya Rosli ◽  
Nur Aqilah Buniamin ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Sodium Alginate ◽  
Oxide Thin Film

scholarly journals Alcohol-based highly conductive polymer for conformal nanocoatings on hydrophobic surfaces toward a highly sensitive and stable pressure sensor

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Jung Joon Lee ◽  
Srinivas Gandla ◽  
Byeongjae Lim ◽  
Sunju Kang ◽  
Sunyoung Kim ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Mechanical Stability ◽  
Exchange Process ◽  
Conductive Polymer ◽  
High Sensitivity ◽  
Fast Response ◽  
Pdms Surface ◽  
Practical Applications ◽  
Sensor Applications ◽  
Water Based

Abstract Conformal and ultrathin coating of highly conductive PEDOT:PSS on hydrophobic uneven surfaces is essential for resistive-based pressure sensor applications. For this purpose, a water-based poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) solution was successfully exchanged to an organic solvent-based PEDOT:PSS solution without any aggregation or reduction in conductivity using the ultrafiltration method. Among various solvents, the ethanol (EtOH) solvent-exchanged PEDOT:PSS solution exhibited a contact angle of 34.67°, which is much lower than the value of 96.94° for the water-based PEDOT:PSS solution. The optimized EtOH-based PEDOT:PSS solution exhibited conformal and uniform coating, with ultrathin nanocoated films obtained on a hydrophobic pyramid polydimethylsiloxane (PDMS) surface. The fabricated pressure sensor showed high performances, such as high sensitivity (−21 kPa−1 in the low pressure regime up to 100 Pa), mechanical stability (over 10,000 cycles without any failure or cracks) and a fast response time (90 ms). Finally, the proposed pressure sensor was successfully demonstrated as a human blood pulse rate sensor and a spatial pressure sensor array for practical applications. The solvent exchange process using ultrafiltration for these applications can be utilized as a universal technique for improving the coating property (wettability) of conducting polymers as well as various other materials.

Graphene quantum dots supported by graphene oxide as a sensitive fluorescence nanosensor for cytochrome c detection and intracellular imaging

2017 ◽  
Vol 5 (31) ◽  
pp. 6300-6306 ◽  
Author(s):  
Lin Cao ◽  
Xiangqing Li ◽  
Lixia Qin ◽  
Shi-Zhao Kang ◽  
Guodong Li
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Cytochrome C ◽  
Graphene Quantum Dots ◽  
A549 Cells ◽  
High Sensitivity ◽  
Fluorescence Sensor ◽  
Intracellular Imaging ◽  
New Class ◽  
Sensitivity And Selectivity

A new class of Cyt c detection fluorescence sensor based on graphene quantum dots supported by graphene oxide has been facilely developed. The sensor shows a high sensitivity and selectivity for Cyt c detection, and further exhibits favorable intracellular imaging in A549 cells.

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