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The conceptual design of a self\u2010powered \u201ceco\u2010energy\u201d smart card based on paper promotes green and clean energy, which will bring the zero e\u2010waste challenge one step closer to fruition. A commercial raw filter paper is modified through a fast in situ functionalization method, resulting in a conductive cellulose fiber\/polyaniline composite, which is then applied as an energy harvester based on a mechano\u2010responsive charge transfer mechanism through a metal\/conducting polymer interface. Different electrodes are studied to optimize charge transfer based on contact energy level differences. The highest power density and current density obtained from such a paper\u2010based \u201ceco\u2010energy\u201d smart card device are 1.75 W m<jats:sup>\u22122<\/jats:sup> and 33.5 mA m<jats:sup>\u22122<\/jats:sup> respectively. This self\u2010powered smart energy card is also able to light up several commercial light\u2010emitting diodes, power on electronic devices, and charge capacitors.<\/jats:p>","DOI":"10.1002\/adfm.201908994","type":"journal-article","created":{"date-parts":[[2019,11,20]],"date-time":"2019-11-20T03:16:25Z","timestamp":1574219785000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Touch\u2010Interactive Flexible Sustainable Energy Harvester and Self\u2010Powered Smart Card"],"prefix":"10.1002","volume":"30","author":[{"given":"Guilherme","family":"Ferreira","sequence":"first","affiliation":[{"name":"i3N\/CENIMAT Department of Materials Science Faculty of Science and Technology Universidade NOVA de Lisboa and CEMOP\/UNINOVA  Campus de Caparica 2829\u2010516 Caparica Portugal"}]},{"given":"Sumita","family":"Goswami","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT Department of Materials Science Faculty of Science and Technology Universidade NOVA de Lisboa and CEMOP\/UNINOVA  Campus de Caparica 2829\u2010516 Caparica Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9817-7389","authenticated-orcid":false,"given":"Suman","family":"Nandy","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT Department of Materials Science Faculty of Science and Technology Universidade NOVA de Lisboa and CEMOP\/UNINOVA  Campus de Caparica 2829\u2010516 Caparica Portugal"}]},{"given":"Luis","family":"Pereira","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT Department of Materials Science Faculty of Science and Technology Universidade NOVA de Lisboa and CEMOP\/UNINOVA  Campus de Caparica 2829\u2010516 Caparica Portugal"}]},{"given":"Rodrigo","family":"Martins","sequence":"additional","affiliation":[{"name":"i3N\/CENIMAT Department of Materials Science Faculty of Science and Technology Universidade NOVA de Lisboa and CEMOP\/UNINOVA  Campus de Caparica 2829\u2010516 Caparica 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