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3. Effects of Processing‐Induced Contamination on Organic Electronic Devices

Author

Simatos, Dimitrios, primary, Jacobs, Ian E., additional, Dobryden, Illia, additional, Nguyen, Małgorzata, additional, Savva, Achilleas, additional, Venkateshvaran, Deepak, additional, Nikolka, Mark, additional, Charmet, Jérôme, additional, Spalek, Leszek J., additional, Gicevičius, Mindaugas, additional, Zhang, Youcheng, additional, Schweicher, Guillaume, additional, Howe, Duncan J., additional, Ursel, Sarah, additional, Armitage, John, additional, Dimov, Ivan B., additional, Kraft, Ulrike, additional, Zhang, Weimin, additional, Alsufyani, Maryam, additional, McCulloch, Iain, additional, Owens, Róisín M., additional, Claesson, Per M., additional, Knowles, Tuomas P. J., additional, and Sirringhaus, Henning, additional

Published
2023
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4. Effects of Processing-Induced Contamination on Organic Electronic Devices

Author

Simatos, Dimitrios, Jacobs, Ian E., Dobryden, Illia, Nguyen, Małgorzata, Savva, Achilleas, Venkateshvaran, Deepak, Nikolka, Mark, Charmet, Jérôme, Spalek, Leszek J., Gicevičius, Mindaugas, Zhang, Youcheng, Schweicher, Guillaume, Howe, Duncan J., Ursel, Sarah, Armitage, John, Dimov, Ivan B., Kraft, Ulrike, Zhang, Weimin, Alsufyani, Maryam, McCulloch, Iain, Owens, Róisín M., Claesson, Per M., Knowles, Tuomas P.J., Sirringhaus, Henning, Simatos, Dimitrios, Jacobs, Ian E., Dobryden, Illia, Nguyen, Małgorzata, Savva, Achilleas, Venkateshvaran, Deepak, Nikolka, Mark, Charmet, Jérôme, Spalek, Leszek J., Gicevičius, Mindaugas, Zhang, Youcheng, Schweicher, Guillaume, Howe, Duncan J., Ursel, Sarah, Armitage, John, Dimov, Ivan B., Kraft, Ulrike, Zhang, Weimin, Alsufyani, Maryam, McCulloch, Iain, Owens, Róisín M., Claesson, Per M., Knowles, Tuomas P.J., and Sirringhaus, Henning

Abstract

Organic semiconductors are a family of pi-conjugated compounds used in many applications, such as displays, bioelectronics, and thermoelectrics. However, their susceptibility to processing-induced contamination is not well understood. Here, it is shown that many organic electronic devices reported so far may have been unintentionally contaminated, thus affecting their performance, water uptake, and thin film properties. Nuclear magnetic resonance spectroscopy is used to detect and quantify contaminants originating from the glovebox atmosphere and common laboratory consumables used during device fabrication. Importantly, this in-depth understanding of the sources of contamination allows the establishment of clean fabrication protocols, and the fabrication of organic field effect transistors (OFETs) with improved performance and stability. This study highlights the role of unintentional contaminants in organic electronic devices, and demonstrates that certain stringent processing conditions need to be met to avoid scientific misinterpretation, ensure device reproducibility, and facilitate performance stability. The experimental procedures and conditions used herein are typical of those used by many groups in the field of solution-processed organic semiconductors. Therefore, the insights gained into the effects of contamination are likely to be broadly applicable to studies, not just of OFETs, but also of other devices based on these materials., QC 20240626

Published
2023
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7. Prevention of the foreign body response to implantable medical devices by inflammasome inhibition

Author

Barone, Damiano G., primary, Carnicer-Lombarte, Alejandro, additional, Tourlomousis, Panagiotis, additional, Hamilton, Russell S., additional, Prater, Malwina, additional, Rutz, Alexandra L., additional, Dimov, Ivan B., additional, Malliaras, George G., additional, Lacour, Stephanie P., additional, Robertson, Avril A. B., additional, Franze, Kristian, additional, Fawcett, James W., additional, and Bryant, Clare E., additional

Published
2022
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11. Mechanical matching of implant to host minimises foreign body reaction

Author

Carnicer-Lombarte, Alejandro, Barone, Damiano G., Dimov, Ivan B., Hamilton, Russell S., Prater, Malwina, Zhao, Xiaohui, Rutz, Alexandra L., Malliaras, George G., Lacour, Stephanie P., Bryant, Clare E., Fawcett, James W., and Franze, Kristian

Abstract

Medical implants offer a unique and powerful therapeutic approach in many areas of medicine. However, their lifetime is often limited as they may cause a foreign body reaction (FBR) leading to their encapsulation by scar tissue 1–4 . Despite the importance of this process, how cells recognise implanted materials is still poorly understood 5, 6 . Here, we show how the mechanical mismatch between implants and host tissue leads to FBR. Fibroblasts and macrophages, which are both crucially involved in mediating FBR, became activated when cultured on materials just above the stiffness found in healthy tissue. Coating implants with a thin layer of hydrogel or silicone with a tissue-like elastic modulus of ∼1 kPa or below led to significantly reduced levels of inflammation and fibrosis after chronic implantation both in peripheral nerves and subcutaneously. This effect was linked to the nuclear localisation of the mechanosensitive transcriptional regulator YAP in vivo . Hence, we identify the mechanical mismatch between implant and tissue as a driver of FBR. Soft implant coatings matching the mechanical properties of host tissue minimized FBR and may be used as a novel therapeutic strategy to improve long-term biomedical implant stability without extensive modification of current implant manufacturing techniques, thus facilitating clinical translation. One sentence summary Foreign body reaction to medical implants can be avoided by matching the stiffness of the implant surface to that of the host tissue.

Published
2019
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12. Foreign body reaction is triggeredin vivoby cellular mechanosensing of implants stiffer than host tissue

Author

Carnicer-Lombarte, Alejandro, primary, Barone, Damiano G., additional, Dimov, Ivan B., additional, Hamilton, Russell S., additional, Prater, Malwina, additional, Zhao, Xiaohui, additional, Rutz, Alexandra L., additional, Malliaras, George G., additional, Lacour, Stephanie P., additional, Bryant, Clare E., additional, Fawcett, James W., additional, and Franze, Kristian, additional

Published
2019
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