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Herein, crumpled graphene flakes network (c\u2010GFN) channel based highly sensitive pressure sensing field effect transistors (PRESSFETs) are presented. The solution\u2010processed PRESSFET devices are developed on ultrathin (\u22483\u2009\u03bcm thick) biodegradable graphene oxide\u2013chitosan (GO\u2013CS) substrate. The distinctive crumpled morphology of GFN leads to a bandgap of 800\u2009meV, which allows the device to have clear ON and OFF electronic states and low subthreshold swing. The presented device can work over a dynamic pressure range (0.5\u20132\u2009kPa), while exhibiting good electrical stability and repeatability during rapid switching. The application of the presented device is demonstrated by attaching them to the temple regions of the face and pressing them with flexure and relaxation of respective temporalis muscles for hands\u2010free control of the movements of a robotic device. The pressure sensing device turns ON when the facial temporalis muscle is flexed and returns to the OFF state when it is relaxed. Finally, the degradability of the devices is presented to demonstrate their easy disposability and potential for zero electronic waste.<\/jats:p><\/jats:sec>","DOI":"10.1002\/aisy.202200183","type":"journal-article","created":{"date-parts":[[2022,9,29]],"date-time":"2022-09-29T08:27:13Z","timestamp":1664440033000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Ultra\u2010Flexible Biodegradable Pressure Sensitive Field Effect Transistors for Hands\u2010Free Control of Robot Movements"],"prefix":"10.1002","volume":"4","author":[{"given":"Ambarish","family":"Paul","sequence":"first","affiliation":[{"name":"Bendable Electronics and Sensing Technologies (BEST) Group James Watt School of Engineering University of Glasgow  Glasgow G12 8QQ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nivasan","family":"Yogeswaran","sequence":"additional","affiliation":[{"name":"Bendable Electronics and Sensing Technologies (BEST) Group James Watt School of Engineering University of Glasgow  Glasgow G12 8QQ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3858-3841","authenticated-orcid":false,"given":"Ravinder","family":"Dahiya","sequence":"additional","affiliation":[{"name":"Bendable Electronics and Sensing Technologies (BEST) Group James Watt School of Engineering University of Glasgow  Glasgow G12 8QQ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,9,29]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2745"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acssensors.9b02260"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/micronano.2016.43"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.0c13637"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/TNSRE.2020.2986222"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.3390\/s21062075"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1109\/JPROC.2019.2941665"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/aisy.202100091"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12274-021-3345-8"},{"key":"e_1_2_11_11_1","first-page":"c37","volume":"9","author":"Kumar M.","year":"2014","journal-title":"Innovat. 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