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  • 1.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Boda, Ulrika
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Åhlin, Jessica
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Posset, Uwe
    Fraunhofer, Germany.
    Schott, Marco
    Fraunhofer, Germany.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Reflective and Complementary Transmissive All-Printed Electrochromic Displays Based on Prussian Blue2023In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 25, no 6, article id 2201299Article in journal (Refereed)
    Abstract [en]

    By combining the electrochromic (EC) properties of Prussian blue (PB) and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), complementary EC displays manufactured by slot-die coating and screen printing on flexible plastic substrates are reported. Various display designs have been realized, resulting in displays operating in either transmissive or reflective mode. For the transmission mode displays, the color contrast is enhanced by the complementary switching of the two EC electrodes PB and PEDOT:PSS. Both electrodes are either exhibiting a concurrent colorless or blue appearance. For the displays operating in reflection mode, a white opaque electrolyte is used in conjunction with the EC properties of PB, resulting in a display device switching between a fully white state and a blue-colored state. The developments of the different device architectures, that either operate in reflection or transmission mode, demonstrate a scalable manufacturing approach of all-printed EC displays that may be used in a large variety of Internet of Things applications. © 2022 The Authors. 

  • 2.
    Boda, Ulrika
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Linköping University, Sweden.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Andersson Ersman, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Tybrandt, Klas
    Linköping University, Sweden.
    Fully Screen-Printed Stretchable Organic Electrochemical Transistors2023In: Advanced Materials Technologies, E-ISSN 2365-709XArticle in journal (Refereed)
    Abstract [en]

    Stretchable organic electrochemical transistors (OECTs) are promising for wearable applications within biosensing, bio-signal recording, and addressing circuitry. Efficient large-scale fabrication of OECTs can be performed with printing methods but to date there are no reports on high-performance fully printed stretchable OECTs. Herein, this challenge is addressed by developing fully screen-printed stretchable OECTs based on an architecture that minimizes electrochemical side reactions and improves long-term stability. Fabrication of the OECTs is enabled by in-house development of three stretchable functional screen-printing inks and related printing processes. The stretchable OECTs show good characteristics in terms of transfer curves, output characteristics, and transient response up to 100% static strain and 500 strain cycles at 25% and 50% strain. The strain insensitivity of the OECTs can be further improved by strain conditioning, resulting in stable performance up to 50% strain. Finally, an electrochromic smart pixel is demonstrated by connecting a stretchable OECT to a stretchable electrochromic display. It is believed that the development of screen-printed stretchable electrochemical devices, and OECTs in particular, will pave the way for their use in wearable applications and commercial products. © 2023 The Authors. 

  • 3.
    Brooke, Robert
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Freitag, Kathrin
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Mulla, Mohammad Yusuf
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Nilsson, Marie
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Isacsson, Patrik
    Linköping University, Sweden; Ahlstrom Group Innovation, France.
    Andersson Ersman, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Paper Electronics Utilizing Screen Printing and Vapor Phase Polymerization2023In: Advanced Sustainable Systems, ISSN 2366-7486Article in journal (Refereed)
    Abstract [en]

    The rise of paper electronics has been accelerated due to the public push for sustainability. Electronic waste can potentially be avoided if certain materials in electronic components can be substituted for greener alternatives such as paper. Within this report, it is demonstrated that conductive polymers poly(3,4-ethylenedoxythiophene) (PEDOT), polypyrrole, and polythiophene, can be synthesized by screen printing combined with vapor phase polymerization on paper substrates and further incorporated into functional electronic components. High patterning resolution (100 µm) is achieved for all conductive polymers, with PEDOT showing impressive sheet resistance values. PEDOT is incorporated as conductive circuitry and as the active material in all-printed electrochromic displays. The conductive polymer circuits allow for functional light emitting diodes, while the electrochromic displays are comparable to commercial displays utilizing PEDOT on plastic substrates. 

  • 4.
    Brooke, Robert
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Freitag, Kathrin
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Nilsson, Martin
    Andersson Ersman, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    All-Printed Electrochromic Stickers2023In: Macromolecular materials and engineering, ISSN 1438-7492, E-ISSN 1439-2054, Vol. 308, no 9, article id 2300044Article in journal (Refereed)
    Abstract [en]

    Displays are one of the most mature technologies in the field of printed electronics. Their ability to be manufactured in large quantities and at low cost has led to their recent uptake into the consumer market. Within this article this technology is extended to electrochromic display stickers. This is achieved using a recent reverse display architecture screen printed on textile and paper sticker substrates. The electrochromic stickers are comparable to plastic control substrates and show little performance difference even when adhered to curved surfaces. The electrochromic display technology is extended to sticker labels for authentication applications by patterning either the dielectric or the graphical layer. A proof-of-concept prototype emulating a wax seal on an envelope is presented to show that other colors can be implemented in this technology. © 2023 The Authors.

  • 5.
    Brooke, Robert
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Majee, Subimal
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Olsson, Oliver
    Chalmers University of Technology, Sweden.
    Dahlin, Aandres
    Chalmers University of Technology, Sweden.
    Andersson Ersman, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    All-Printed Multilayers and Blends of Poly(dioxythiophene) Derivatives Patterned into Flexible Electrochromic Displays2023In: Macromolecular materials and engineering, ISSN 1438-7492, E-ISSN 1439-2054, Vol. 308, no 2, article id 2200453Article in journal (Refereed)
    Abstract [en]

    Low-cost, flexible and thin display technology is becoming an interesting field of research as it can accompany the wide range of sensors being developed. Here, the synthesis of poly(dimethylpropylene-dioxythiophene) (PProDOT-Me2) by combining vapor phase polymerization and screen printing is presented. A multilayer architecture using poly(3,4-ethylenedioxythiophene) (PEDOT) and PProDOT-Me2 to allow for electrochromic switching of PProDOT-Me2, thereby eliminating the need for a supporting transparent conductive (metal oxide) layer is introduced. Furthermore, the technology is adapted to a blended architecture, which removes the additional processing steps and results in improved color contrast (∆E* > 25). This blend architecture is extended to other conductive polymers, such as PEDOT and polypyrrole (PPy), to highlight the ability of the technique to adjust the color of all-printed electrochromic displays. As a result, a green color is obtained when combining the blue and yellow states of PEDOT and PPy, respectively. This technology has the potential to pave the way for all-printed multicolored electrochromic displays for further utilization in printed electronic systems in various Internet of Things applications. © 2022 The Authors. 

  • 6.
    Brooke, Robert
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Wijeratne, Kosala
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Andersson Ersman, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Electrochromic Displays Manufactured by a Combination of Vapor Phase Polymerization and Screen Printing2022In: Advanced Materials Technologies, E-ISSN 2365-709X, Vol. 7, no 8, article id 2200054Article in journal (Refereed)
    Abstract [en]

    Smart label technology such as indicators is a growing field due to society's demand for Internet of Things devices. New materials and technologies are continuously being discovered and developed in order to provide better resolution, better performance, or more environmentally friendly devices. Within this report, screen printing technology is combined with vapor phase polymerization to synthesize three conductive polymers; poly(3,4-ethylenedioxythiophene) (PEDOT), polypyrrole (PPy), and polythiophene (PTh). The conductive polymers are created in micrometer resolution and investigated for their electrochromic properties. PEDOT and PPy samples are combined into printed, laminated, transmissive electrochromic displays. The technology is further advanced to establish separate PEDOT, PPy, and PTh all-printed electrochromic displays using several screen printed layers. The PEDOT displays show improved color retention as compared to displays created with commercially available PEDOT:poly(styrene sulfonate) (PSS) with comparable contrast and switching behavior. All-printed PPy and PTh electrochromic displays with impressive electrochromic behavior are demonstrated. More complex patterns of 7-segment displays are created, thereby highlighting flexibility and individually switched sections of the conductive polymers. This research extends the screen printing and vapor phase polymerization combination to other conductive polymers and the potential commercialization of multicolor electrochromic displays that has been otherwise dominated by monochromatic PEDOT:PSS. 

  • 7.
    Chen, Shangzhi
    et al.
    Linköping University, Sweden.
    Kühne, Philipp
    Linköping University, Sweden.
    Stanishev, Vallery
    Linköping University, Sweden.
    Knight, Sean
    University of Nebraska-Lincoln, US.
    Brooke, Robert
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Petsagkourakis, Ioannis
    Linköping University, Sweden.
    Crispin, Xavier
    Linköping University, Sweden.
    Schubert, Mathias
    Linköping University, Sweden; University of Nebraska-Lincoln, US; Leibniz-Institut für Polymerforschung Dresden e.V., Germany.
    Darakchieva, Vanya
    Linköping University, Sweden.
    Jonsson, Magnus
    Linköping University, Sweden.
    On the anomalous optical conductivity dispersion of electrically conducting polymers: Ultra-wide spectral range ellipsometry combined with a Drude-Lorentz model2019In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 7, no 15, p. 4350-4362Article in journal (Refereed)
    Abstract [en]

    Electrically conducting polymers (ECPs) are becoming increasingly important in areas such as optoelectronics, biomedical devices, and energy systems. Still, their detailed charge transport properties produce an anomalous optical conductivity dispersion that is not yet fully understood in terms of physical model equations for the broad range optical response. Several modifications to the classical Drude model have been proposed to account for a strong non-Drude behavior from terahertz (THz) to infrared (IR) ranges, typically by implementing negative amplitude oscillator functions to the model dielectric function that effectively reduce the conductivity in those ranges. Here we present an alternative description that modifies the Drude model via addition of positive-amplitude Lorentz oscillator functions. We evaluate this so-called Drude-Lorentz (DL) model based on the first ultra-wide spectral range ellipsometry study of ECPs, spanning over four orders of magnitude: from 0.41 meV in the THz range to 5.90 eV in the ultraviolet range, using thin films of poly(3,4-ethylenedioxythiophene):tosylate (PEDOT:Tos) as a model system. The model could accurately fit the experimental data in the whole ultrawide spectral range and provide the complex anisotropic optical conductivity of the material. Examining the resonance frequencies and widths of the Lorentz oscillators reveals that both spectrally narrow vibrational resonances and broader resonances due to localization processes contribute significantly to the deviation from the Drude optical conductivity dispersion. As verified by independent electrical measurements, the DL model accurately determines the electrical properties of the thin film, including DC conductivity, charge density, and (anisotropic) mobility. The ellipsometric method combined with the DL model may thereby become an effective and reliable tool in determining both optical and electrical properties of ECPs, indicating its future potential as a contact-free alternative to traditional electrical characterization.

  • 8.
    Chen, Shangzhi
    et al.
    Linköping University, Sweden.
    Petsagkourakis, Ioannis
    Linköping University, Sweden.
    Spampinato, Nicoletta
    University Bordeaux, France.
    Kuang, Chaoyang
    Linköping University, Sweden.
    Liu, Xianjie
    Linköping University, Sweden.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Kang, Evan
    Linköping University, Sweden.
    Fahlman, Mats
    Linköping University, Sweden.
    Crispin, Xavier
    Linköping University, Sweden.
    Pavlopoulou, Eleni
    University Bordeaux, France.
    Jonsson, Magnus
    Linköping University, Sweden.
    Unraveling vertical inhomogeneity in vapour phase polymerized PEDOT:Tos films2020In: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 8, no 36, p. 18726-18734Article in journal (Refereed)
    Abstract [en]

    The conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) forms a promising alternative to conventional inorganic conductors, where deposition of thin filmsviavapour phase polymerization (VPP) has gained particular interest owing to high electrical conductivity within the plane of the film. The conductivity perpendicular to the film is typically much lower, which may be related not only to preferential alignment of PEDOT crystallites but also to vertical stratification across the film. In this study, we reveal non-linear vertical microstructural variations across VPP PEDOT:Tos thin films, as well as significant differences in doping level between the top and bottom surfaces. The results are consistent with a VPP mechanism based on diffusion-limited transport of polymerization precursors. Conducting polymer films with vertical inhomogeneity may find applications in gradient-index optics, functionally graded thermoelectrics, and optoelectronic devices requiring gradient doping. 

  • 9.
    Kim, Nara
    et al.
    Linköping university, Sweden.
    Lienemann, Samuel
    Linköping university, Sweden.
    Khan, Ziyauddin
    Linköping university, Sweden.
    Greczynski, Grzegorz
    Linköping university, Sweden.
    Rahmanudin, Aiman
    Linköping university, Sweden.
    Vagin, Mikhail
    Linköping university, Sweden.
    Ahmed, Fareed
    Linköping university, Sweden.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Linköping university, Sweden.
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Crispin, Xavier
    Linköping university, Sweden.
    Tybrandt, Klas
    Linköping university, Sweden.
    An intrinsically stretchable symmetric organic battery based on plant-derived redox molecules2023In: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 11, no 46, p. 25703-25714Article in journal (Refereed)
    Abstract [en]

    Intrinsically stretchable energy storage devices are essential for the powering of imperceptible wearable electronics. Organic batteries based on plant-derived redox-active molecules can offer critical advantages from a safety, sustainability, and economic perspective, but such batteries are not yet available in soft and stretchable form factors. Here we report an intrinsically stretchable organic battery made of elastomeric composite electrodes formulated with alizarin, a natural dye derived from the plant Rubia tinctorum, whose two quinone motifs enable its uses in both positive and negative electrodes. The quaternary biocomposite electrodes possess excellent electron-ion conduction/coupling and superior stretchability (>300%) owing to self-organized hierarchical morphology. In a full-cell configuration, its energy density of 3.8 mW h cm−3 was preserved at 100% strain, and assembled modules on stretchy textiles and rubber gloves can power integrated LEDs during various deformations. This work paves the way for low-cost, eco-friendly, and deformable batteries for next generation wearable electronics. 

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  • 10.
    Linderhed, Ulrika
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Linköping University, Sweden.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Linköping University, Sweden.
    Andersson Ersman, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Tybrandt, Klas
    Linköping University, Sweden.
    Fully screen printed stretchable electrochromic displays2021In: Flexible and Printed Electronics, ISSN 2058-8585, Vol. 6, no 4, article id 045014Article in journal (Refereed)
    Abstract [en]

    The advent of the Internet of Things and the growing interest in continuous monitoring by wearables have created a need for conformable and stretchable displays. Electrochromic displays (ECDs) are receiving attention as a cost-effective solution for many simple applications. However, stretchable ECDs have yet to be produced in a robust, large scale and cost-efficient manner. Here we develop a process for making fully screen printed stretchable ECDs. By evaluating commercially available inks with respect to electromechanical properties, including electrochromic PEDOT:PSS inks, our process can be directly applied in the manufacturing of stretchable organic electronic devices. The manufactured ECDs retained colour contrast with useful switching times at static strains up to 50% and strain cycling up to 30% strain. To further demonstrate the applicability of the technology, double-digit 7-segment ECDs were produced, which could conform to curved surfaces and be mounted onto stretchable fabrics while remaining fully functional. Based on their simplicity, robustness and processability, we believe that low cost printed stretchable ECDs can be easily scaled up and will find many applications within the rapidly growing markets of wearable electronics and the Internet of Things. © 2021 The Author(s). 

  • 11.
    Petsagkourakis, Ioannis
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Strandberg, Jan
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Nilsson, Marie
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Leandri, Valentina
    RISE Research Institutes of Sweden, Bioeconomy and Health, Chemical Process and Pharmaceutical Development.
    Lassen, Bo
    RISE Research Institutes of Sweden, Bioeconomy and Health, Chemical Process and Pharmaceutical Development.
    Sandberg, Mats
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Polymerization of benzoxazine impregnated in porous carbons. A scalable and low-cost route to smart copper-ion absorbents with saturation indicator function2024In: Process Safety and Environmental Protection, ISSN 0957-5820, E-ISSN 1744-3598, Vol. 184, p. 782-789Article in journal (Refereed)
    Abstract [en]

    Porous carbon materials are common materials used for sensor and absorbent applications. A novel approach for functionalizing porous carbons through the impregnation of porous carbon black with benzoxazine monomers, followed by thermal polymerization is introduced herein. The method not only establishes a new avenue for the functionalization of porous carbons but also endows the resulting material with both copper ion-binding and sensing properties. We showcase the versatility of the technique by illustrating that the polymerization of phenols with benzoxazine monomers serves as an extra tool to customize absorption- and sensing properties. Experimental validation involved testing the method on carbon black as a porous substrate, which was impregnated with both bisphenol-a benzoxazine and a combination of bisphenol-a benzoxazine and alizarin. The resulting materials were assessed for their dual functionality as both an absorbent and a sensor for copper ions by varied copper ion concentrations and exposure times. The dye absorption test demonstrated a notable capacity to accumulate copper ions from dilute solutions. Electrochemical characterization further confirmed the effectiveness of the modified carbons, as electrodes produced from inks were successful in detecting copper ions accumulated from 50 μM Cu2+ solutions. With this work, we aspire to set the steppingstone towards a facile functionalization of porous carbon materials towards water purification applications. © 2024 The Authors

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  • 12.
    Petsagkourakis, Ioannis
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Kim, Donghyun
    Chalmers University of Technology, Sweden.
    Modarresi, Mohsen
    Ferdowsi University of Mashhad, Iran.
    Rudd, Sam
    Airbridge Pty Ltd, Australia.
    Rudd, Roya
    Electro Aero Pty Ltd, Australia.
    Zozoulenko, Igor
    Linköping University, Sweden.
    Evans, Drew
    University of South Australia, Australia.
    A nuanced understanding of the doping of poly(3,4-ethylenedioxythiophene) with tosylate2023In: Discover Materials, E-ISSN 2730-7727, Vol. 3, no 10Article in journal (Refereed)
    Abstract [en]

    The conducting polymer poly(3,4-ethylenedioxythiophene) (known as PEDOT) is routinely fabricated into doped thin films for investigation of its inherent properties as well as for a range of applications. Fabrication of PEDOT is often achieved via oxidative polymerisation, where the conducting polymer is polymerised and doped (oxidised) to yield a conductive polymer thin film. The oxidiser and the polymerisation temperature are two parameters that may influence the properties and performance of the resultant PEDOT thin film. In this study, the role of temperature for the chemical polymerisation of PEDOT using the oxidiser iron tosylate is investigated from a computational and experimental viewpoint. While computations of the doping energetics suggest increasing doping with increasing temperature, x-ray photoelectron spectroscopy of fabricated PEDOT thin films indicate doping is much more complicated. With the aid of computations of the spatial distribution functions for tosylate in PEDOT, experiments indicate that two different populations of tosylate anions exist in the PEDOT matrix. Their relative populations change as a function of the polymerisation temperature. Therefore, polymerisation temperature plays a critical role in tailoring the properties of PEDOT in pursuit of being fit-for-purpose for the desired application.

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