Cheap, Flexible, and Thermal-Sensitive Paper Sensor through Writing with Ionic Liquids Containing Pencil Leads

Abstract

The flexible and portable paper-based sensors have a broad potential application in electronic detection and devices. In this work, a flexible thermoresponsive paper sensor was reported by writing on A4 paper with composite pencil leads which contain thermoresponsive pyrene-based ionic liquid [Pyrmim][Br]. The [Pyrmim][Br] was transferred onto the A4 paper surface with graphite by pencil writing for the facile preparation of thermal-sensitive paper chips. The as-prepared paper sensor was very sensitive to the NIR irradiation and warm objects. What is more, the pliable paper chip also had regular responses along with the varication of the folding angles, which could be employed for the angle goniometer of electronic robots.

Body Compatible Thermometer Based on Green Electrolytes

“…T he past several decades have witnessed explosive development of bioelectronics which have shown great potential in healthcare, especially physiological monitoring systems such as those for electrocardiogram, blood pressure, pulse, temperature, and oxygen partial pressure. 1−6 With increasing efforts on the development of wearable or implantable electronic sensors, a large number of sensing materials have been exploited, mainly formulated by metallic materials, 7,8 semiconducting metal oxides, 9 carbon-based materials, 10,11 and conducting polymers. 12−15 These solidstate sensing materials have already been at the forefront of intensive investigation due to their comparatively mature processing flow, precise measurement, and low cost.…”

“…The past several decades have witnessed explosive development of bioelectronics which have shown great potential in healthcare, especially physiological monitoring systems such as those for electrocardiogram, blood pressure, pulse, temperature, and oxygen partial pressure. − With increasing efforts on the development of wearable or implantable electronic sensors, a large number of sensing materials have been exploited, mainly formulated by metallic materials, , semiconducting metal oxides, carbon-based materials, , and conducting polymers. − These solid-state sensing materials have already been at the forefront of intensive investigation due to their comparatively mature processing flow, precise measurement, and low cost. In terms of excellent deformability and facile recycling of liquid materials, liquid electronics based on electrically conductive liquids including ionic liquids and liquid metals are forming a new research field when considering their advantages of high flexibility, self-healing ability, and capacity of doping/being doped with other functional materials.…”

Hydrogen Sensing Using Paper Sensors with Pencil Marks Decorated with Palladium

“…In previous reports on the production of paper-type sensors made by pencil drawing, Zhang et al fabricated variable resistors and strain sensors using the pen-on-paper method [40], while Zhang and Ma et al developed a temperature-responsive paper-based sensor using pencil lead containing an ionic liquid [41]. Furthermore, Huang et al fabricated NO 2 gas sensors based on pencil drawings and Ag electrodes made on paper [42].…”

Thermotropic Phase Transitions in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Ionic Liquids are Dependent on Heat Flux

“…Temperature swings associated with many potential applications ,,− can approach or exceed the near-ambient temperatures of many IL phase transitions. Moreover, the heating or cooling rate at which these transitions are met, that is, the heating flux, can lead to variable expression of phases. − It is important to identify and understand these thermotropic effects so that ILs can be judiciously applied .…”