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Laser-induced graphitization of a forest-based ink for use in flexible and printed electronics

npj Flexible Electronics 2020年第1期4卷 149-158页

作者： jesper edberg Robert Brooke Omid Hosseinaei Andreas Fall Kosala Wijeratne Mats Sandberg RISE Bio-and Organic Electronics Bredgatan 3360221NorrköpingSweden RISE Bioeconomy Drottning Kristinas väg 6111428StockholmSweden

Laser-induced graphitization(LIG)is a method of converting a carbon-rich precursor into a highly conductive graphite-like carbon by laser *** method has shown great promise as a versatile and low-cost patterning *** we show for the first time how an ink based on cellulose and lignin can be patterned using screen printing followed by laser *** printing is one of the most commonly used manufacturing techniques of printed electronics,making this approach compatible with existing processing of various *** use of forest-based materials opens the possibility of producing green and sustainable ***-patterning of the ink enables carbon patterns without residual precursor between the *** investigated the effect of the ink composition,laser parameters,and additives on the conductivity and structure of the resulting carbon and could achieve low sheet resistance of 3.8Ωsq^(−1) and a high degree of *** demonstrated that the process is compatible with printed electronics and finally manufactured a humidity sensor which uses lignin as the sensing layer and graphitized lignin as the electrodes.

关键词： forest printing electronics

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Ultrasensitive electrolyte-assisted temperature sensor

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npj Flexible Electronics 2020年第1期4卷 203-209页

作者： Mina Shiran Chaharsoughi jesper edberg Peter Andersson Ersman Xavier Crispin Dan Zhao Magnus P.Jonsson Laboratory of Organic Electronics Department of Science and TechnologyLinköping UniversitySE-60174NorrköpingSweden RISE Research Institutes of Sweden Bio-and Organic ElectronicsBredgatan 3360221NorrköpingSweden

Heat sensors form an important class of devices that are used across multiple fields and *** applications such as electronic skin and health monitoring,it is particularly advantageous if the output electronic signals are not only high,stable,and reproducible,but also self-generated to minimize power ***,we present an ultrasensitive heat sensing concept that fulfills these criteria while also being compatible with scalable low-cost manufacturing on flexible *** concept resembles a traditional thermocouple,but with separated electrodes bridged by a gel-like electrolyte and with orders of magnitudes higher signals(around 11 mV K^(−1)).The sensor pixels provide stable and reproducible signals upon heating,which,for example,could be used for heat *** modification to plasmonic nanohole metasurface electrodes made the sensors capable of also detecting light-induced ***,we present devices on flexible substrates and show that they can be used to detect human touch.

关键词： electrolyte sensor heating

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Spray-coated paper supercapacitors

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npj Flexible Electronics 2020年第1期4卷 142-148页

作者： Mehmet Girayhan Say Robert Brooke jesper edberg Andrea Grimoldi Dagmawi Belaineh Isak Engquist Magnus Berggren Laboratory of Organic Electronics Department of Science and TechnologyLinköping UniversitySE-60174NorrköpingSweden RISE Research Institutes of Sweden Bio-and Organic ElectronicsBredgatan 35SE-60221NorrköpingSweden Wallenberg Wood Science Center ITNLinköping UniversitySE-60174NorrköpingSweden

The increasing demands to further electrify and digitalize our society set demands for a green electrical energy storage technology that can be scaled between very small,and heavily distributed electrical energy sources,to very large *** technology must be compatible with fast-throughput,large-volume and low-cost fabrication processes,such as using printing and coating ***,we demonstrate a sequential production protocol to fabricate supercapacitors including electrodes based on cellulose nanofibrils(CNF)and the conducting polymer PEDOT:*** and lightweight paper electrodes,carbon adhesion layers and the gel electrolyte are fabricated using spray coating,screen printing,and bar coating,*** all solid-state supercapacitors are flexible,mechanically robust and exhibit a low equivalent series resistance(0.22Ω),thus resulting in a high power density(∼104 W/kg)energy *** supercapacitors are combined and connected to a power management circuit to demonstrate a smart packaging *** work shows that operational and embedded supercapacitors can be manufactured in a manner to allow for the integration with,for instance smart packaging solutions,thus enabling powered,active internet-of-things(IoT)devices in a highly distributed application.

关键词： coating printing electrolyte

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