Elastic layered rubber-graphene composite fabricated by rubbing-in technology for the multi-functional sensors

Каримов, Х. С.; Ahmad, Zubair; Khan, Muhammad Imran; Siddiqui, Khalid J.; Qasuria, T. A.; Abbas, S. Zameer; Usman, Muhammad; Rehman, Adil

doi:10.1016/j.heliyon.2019.e01187

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…6,7 However, the commonly adopted rigid substrate limits their applications in wearable electronics. 8 To improve device flexibility and comfortability, temperature sensors have been made from soft materials such as rubbers, 9 hydrogels, 10 and aerogels. 11 Hydrogels are widely used as flexible sensor substrates due to their good mechanical properties and biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Temperature Detection Based on a Frost- and Dehydration-Resistive Ion-Doped Hydrogel-MXene Composite

Wang

Zou

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Wearable temperature sensors with high sensitivity and stability hold great potential for human health monitoring. However, hydrogels, which are commonly used for wearable devices, often show poor thermal and electrical conductivity and are susceptible to dehydration and freezing. Herein, we developed a frost- and dehydration-resistive temperature sensor based on Fe2+/Ti2CT x /κ-carrageenan (CA)-polyacrylamide (PAM) hydrogel. The Fe2+ ions within the hydrogel existed in two forms: as free ions and bonded ions. The free Fe2+ ions could complex with water molecules, resulting in the improved resistance to dehydration and freezing, as well as enhanced ionic conductivity in the hydrogel. On the other hand, the remaining Fe2+ ions acted as linkers to form coordination bonds with the sulfate groups of CA chains, resulting in the greatly enhanced mechanical strength of the hydrogel. In addition, the Ti2CT x nanosheet-based fillers formed a well-defined porous laminar structure, which reduced the phonon scattering and improved the phonon adsorption within the hydrogel. The Fe2+/Ti2CT x /CA-PAM hydrogel sensor exhibited excellent temperature sensing performance including a good linearity (R 2 = 0.998) within a broad working range (−10 to 60 °C), high resolution (0.1 °C), and good repeatability. Furthermore, the sensor was integrated into a wireless system for continuous monitoring of body temperature, demonstrating its potential in healthcare monitoring, electronic skins, and intelligent robots.

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Section: Introductionmentioning

confidence: 99%

Highly Sensitive Temperature Detection Based on a Frost- and Dehydration-Resistive Ion-Doped Hydrogel-MXene Composite

Wang

Zou

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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“…There are various constructing materials for flexible temperature sensors, such as films, [ 11 ] rubbers, [ 12 ] hydrogels, [ 13 ] and aerogels. [ 14 ] Film has unique flexibility and mechanical compliance, while rubber possesses superior transparency and high elasticity.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, flexible temperature sensors open up many promising opportunities in emerging personal healthcare, [6,7] electronic skin, [8] artificial intelligence, [5,9] and next-generation smart robots. [10] There are various constructing materials for flexible temperature sensors, such as films, [11] rubbers, [12] hydrogels, [13] and Accurate and real-time detection of human body temperature changes is crucial to understand thermal homeostasis, to access complex health conditions, and to further build a smart healthcare system. Recent years have seen temperature sensors open up many potential applications in electronic skin, artificial intelligence, and next-generation smart robots.…”

mentioning

confidence: 99%

Flexible Temperature Sensors Constructed with Fiber Materials

Cai

2022

Adv Materials Technologies

115

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changes in human body temperature are the first medical diagnostic assessment for the recent on-going COVID-19 pandemic. [1,2] Some emotion-related bodily sensations can also be observed by analyzing the subtle change of body temperature. [3] Hence, it is particularly important to real-time detect human body temperature and monitor external environmental temperature change to establish a smart healthcare system and create a comfortable living condition for human beings.Numerous temperature detectors have been developed to detect temperature through certain physical parameter changes, including mercury thermometers, infrared thermometers, and flexible temperature sensors. Specifically, a mercury thermometer can accurately measure the human body temperature based on the principle of heat-expansion and cold-contraction, however, it takes a much longer time to finish the measurement, and the glass maybe easily be broken, which will pollute the environment and pose potential harm risk to the users. An infrared thermometer is a thermometer with a wide range, fast response, and high sensitivity, which infers temperature from the thermal radiation, sometimes called black-body radiation emitted by human beings. Unfavorably, it is prone to be affected by human emissivity and thus the temperature measurement accuracy is always insufficient for practical application. Alternatively, flexible temperature sensors have attracted intense interest due to their favorable proprieties, such as high sensitivity, good accuracy, fast response, and friendly interface. Benefiting from the softness with conformability, flexible temperature sensors can be directly attached to human skin with ease to record both human body temperature and external environmental temperature in a continuous and long-term manner. Flexible temperature sensors are generally divided into thermo-sensitive sensors, thermo-resistive sensors, and thermoelectric sensors according to the change of electrical resistance in conductive materials or change of surface charge in thermoelectric materials. [4,5] Temperature variations can be precisely captured and these timely information are then transmitted to the human nervous system, providing a very useful tool to sense and respond to the environmental or physiological stimuli. Consequently, flexible temperature sensors open up many promising opportunities in emerging personal healthcare, [6,7] electronic skin, [8] artificial intelligence, [5,9] and next-generation smart robots. [10] There are various constructing materials for flexible temperature sensors, such as films, [11] rubbers, [12] hydrogels, [13] and Accurate and real-time detection of human body temperature changes is crucial to understand thermal homeostasis, to access complex health conditions, and to further build a smart healthcare system. Recent years have seen temperature sensors open up many potential applications in electronic skin, artificial intelligence, and next-generation smart robots. Currently, traditional mercury and infrared thermometers are ext...

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“…The properties of the elastic rubber–graphene composite-based multi-functional sensors fabricated by using the rubbing-in technique were studied in Ref. [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Humidity and Temperature on the Impedances and Voltage of Al/Gr-Jelly/Cu-Rubber Composite-Based Flexible Electrochemical Sensors

Chani

Karimov

Bakhsh

et al. 2022

Gels

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Here we present the fabrication of graphene and jelly (superabsorbent polymer) electrolyte composite-based shockproof flexible electrochemical sensors (Al/Gr-Jelly/Cu) and their properties under the effect of humidity and temperature. A layer of graphene mixed in jelly electrolyte was drop-casted onto porous rubber substrates between preliminary fixed aluminum (Al) and copper (Cu) electrodes followed by rubbing-in. It was observed that the graphene and jelly mixture was mechanically soft and flexible, similar to jelly. Electrically, this mixture (graphene and jelly) behaved as a flexible electrolyte. It was observed that under the effect of humidity ranging from 47 to 98%, the impedances of the sensors decreased by 2.0 times on average. Under the effect of temperatures ranging from 21 to 41 °C the impedances decreased by 2.4 times. The average temperature coefficient of impedances was equal to −0.03 °C−1. The electrochemical voltage generated by the flexible jelly electrolyte sensors was also investigated. It was found that the initial open-circuit voltages were equal to 201 mV and increased slightly, by 5–10% under the effect of humidity and temperature as well. The short-circuit currents under the effect of humidity and temperature increased by 2–3 times. The Al/Gr-Jelly/Cu electrochemical sensors may be used as prototypes for the development of the jelly electronic-based devices.

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Elastic layered rubber-graphene composite fabricated by rubbing-in technology for the multi-functional sensors

Cited by 10 publications

References 17 publications

Highly Sensitive Temperature Detection Based on a Frost- and Dehydration-Resistive Ion-Doped Hydrogel-MXene Composite

Highly Sensitive Temperature Detection Based on a Frost- and Dehydration-Resistive Ion-Doped Hydrogel-MXene Composite

Flexible Temperature Sensors Constructed with Fiber Materials

Effect of Humidity and Temperature on the Impedances and Voltage of Al/Gr-Jelly/Cu-Rubber Composite-Based Flexible Electrochemical Sensors

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