Abstract
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.
Highlights
As is known, humidity sensors are used in different areas of modern technology and their properties have been described in detail in the literature
The synthesis and characterization of amino anthraquinone and its application as an active material in environmental sensors were described in Ref. [5]
The sensor is a combination of three elements: resistance, capacitance, and electrochemical cells
Summary
Humidity sensors are used in different areas of modern technology and their properties have been described in detail in the literature. The synthesis and characterization of amino anthraquinone and its application as an active material in environmental sensors were described in Ref. The properties of organic–inorganic composite-based sensors were described in Ref. The graphene-based electrochemical sensor and biosensors were fabricated and investigated by Shao et al [11]. A reduced graphene oxide-based flexible temperature sensor was designed and tested by Liu et al [13]. The graphene-based electrochemical sensors and biosensors were designed, fabricated, and investigated as well [11]. A number of electrochemical sensors were designed, fabricated, and investigated based on graphene as well. In pursuance of our work on the sensors, in this paper we are presenting the data about the fabrication and investigation (of the electric properties) of Al/Gr-Jelly/Cu-rubber composite-based shockproof flexible solid electrochemical humidity and temperature sensors
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