Scalable fabrication of highly sensitive flexible temperature sensors based on silver nanoparticles coated reduced graphene oxide nanocomposite thin films

Neella, Nagarjuna; Gaddam, Venkateswarlu; Nayak, M. M.; Dinesh, N. S.; Rajanna, K.

doi:10.1016/j.sna.2017.11.011

Cited by 50 publications

(20 citation statements)

References 36 publications

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“…Thus, the main electric heating element was increased. This thermal resistance effect has been observed in many other graphene-based conductive composites [ 38 , 39 , 40 ]. For example, the resistance of a wooden electric heating composite was demonstrated to reduce after a current was applied, as well as the heat effect induced from Joule heating [ 41 , 42 ].…”

Section: Resultssupporting

confidence: 60%

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Thin Electric Heating Membrane Constructed with a Three-Dimensional Nanofibrillated Cellulose–Graphene–Graphene Oxide System

Shao

Zhu

et al. 2018

Materials

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Nanofibrillated cellulose (NFC) and graphene oxide (GO) with reinforcing and film-forming properties were employed with graphene to develop a novel and thin electric heating membrane with heat dissipation controllability. A negative charge was found on the surface of GO and NFC in aqueous dispersions, which contributed to the homogeneous distribution of the graphene sheets. The membrane had a good laminated structure with three-dimensional interaction between GO and NFC, with embedded graphene sheets. Conductivity was characterized as a function of the amount of graphene, thus giving control over to the heating power by adjusting the ratio of graphene. Subsequent electric heating tests can remove irregularities on the GO and graphene sheet, improving the laminated structure further. The temperature on the surface of the membrane presented an exponential increasing regularity with time. Under the same power density and time, the stabilized temperature rise of membranes was higher when grammage was higher, which was characterized by the linear function of the power density. Low-grammage membranes (1 and 4 g·m−2) also exhibited regular and even stabilized temperature rises. The indicated structure and heating performance of the membrane, as well as the variation induced by Joule heating, would drive its applications.

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Section: Resultssupporting

confidence: 60%

“…Distinct linear relations were observed among the power density, CRR, and temperature at outage moment, as shown in Figure 16 . The conductivity of the membrane increased linearly as temperature was increased by applying greater powers, which was supposed to be the negative temperature coefficient (NTC) effect [ 38 , 39 , 40 ].…”

Section: Resultsmentioning

confidence: 99%

Thin Electric Heating Membrane Constructed with a Three-Dimensional Nanofibrillated Cellulose–Graphene–Graphene Oxide System

Shao

Zhu

et al. 2018

Materials

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“…With the advent of next‐generation of wearable electronics, there is an urgent need for the development of a transparent, deformable and healable thermal sensor, which can be attached to human body for electronic‐skin applications. There have been several efforts to realize thermal sensors, based on a different mechanism such as thermo‐resistive based thermal sensor, diodes based thermal sensors, and flexible polysilicon‐based thermal sensor . However, there are extremely limited efforts to fabricate soft, deformable, and healable thermal sensors.…”

Section: The Basics Characteristics Of the New Ionic Polymersmentioning

confidence: 99%

Water‐Processable, Stretchable, Self‐Healable, Thermally Stable, and Transparent Ionic Conductors for Actuators and Sensors

et al. 2019

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For emerging biocompatible, wearable, and stretchable epidermal electronic devices, it is essential to realize novel stretchable conductors with the attributes of transparency, low‐cost and nontoxic components, green‐solvent processbility, self‐healing, and thermal stabililty. Although conducting materials–rubber composites, ionic hydrogels, organogels have been developed, no stretchable material system that meets all the outlined requirements has been reported. Here, a series of P(SPMA‐r‐MMA) polymers with different ratios of ionic side chains is designed and synthesized, and it is demonstrated that the resulting stretchable ionic conductors with glycerol are transparent, water processable, self‐healable, and thermally stable due to the chemically linked ionic side chain, satisfying all of the aforementioned requirements. Among the series of polymer gels, the P(SPMA0.75‐r‐MMA0.25) gel shows optimum conductivity (6.7 × 10−4 S cm−1), stretchability (2636% of break at elongation), and self‐healing (98.3% in 3 h) properties. Accordingly, the transparent and self‐healable P(SPMA0.75‐r‐MMA0.25) gels are used to realize thermally robust actuators up to 100 °C and deformable and self‐healable thermal sensors.

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“…8b. Similar to many semiconductors, ITO also shows a negative temperature coefficient (NTC) due to the availability of more free carriers upon an increase of the temperature 50–52 . The temperature dependence of the relative resistance change for the zigzag-shaped ITO is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Transparent and Flexible Mayan-Pyramid-based Pressure Sensor using Facile-Transferred Indium tin Oxide for Bimodal Sensor Applications

Jung

Vishwanath

Kim

et al. 2019

Sci Rep

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Transparent and conducting flexible electrodes have been successfully developed over the last few decades due to their potential applications in optoelectronics. However, recent developments in smart electronics, such as a direct human-machine interface, health-monitoring devices, motion-tracking sensors, and artificially electronic skin also require materials with multifunctional properties such as transparency, flexibility and good portability. In such devices, there remains room to develop transparent and flexible devices such as pressure sensors or temperature sensors. Herein, we demonstrate a fully transparent and flexible bimodal sensor using indium tin oxide (ITO), which is embedded in a plastic substrate. For the proposed pressure sensor, the embedded ITO is detached from its Mayan-pyramid-structured silicon mold by an environmentally friendly method which utilizes water-soluble sacrificial layers. The Mayan-pyramid-based pressure sensor is capable of six different pressure sensations with excellent sensitivity in the range of 100 Pa-10 kPa, high endurance of 105 cycles, and good pulse detection and tactile sensing data processing capabilities through machine learning (ML) algorithms for different surface textures. A 5 × 5-pixel pressure-temperature-based bimodal sensor array with a zigzag-shaped ITO temperature sensor on top of it is also demonstrated without a noticeable interface effect. This work demonstrates the potential to develop transparent bimodal sensors that can be employed for electronic skin (E-skin) applications.

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Scalable fabrication of highly sensitive flexible temperature sensors based on silver nanoparticles coated reduced graphene oxide nanocomposite thin films

Cited by 50 publications

References 36 publications

Thin Electric Heating Membrane Constructed with a Three-Dimensional Nanofibrillated Cellulose–Graphene–Graphene Oxide System

Thin Electric Heating Membrane Constructed with a Three-Dimensional Nanofibrillated Cellulose–Graphene–Graphene Oxide System

Water‐Processable, Stretchable, Self‐Healable, Thermally Stable, and Transparent Ionic Conductors for Actuators and Sensors

Transparent and Flexible Mayan-Pyramid-based Pressure Sensor using Facile-Transferred Indium tin Oxide for Bimodal Sensor Applications

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