Electrochemically synthesized graphene/TEMPO-oxidized cellulose nanofibrils hydrogels: Highly conductive green inks for 3D printing of robust structured EMI shielding aerogels

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorErfanian, Elnazen_US
dc.contributor.authorMoaref, Roxanaen_US
dc.contributor.authorAjdary, Rubinaen_US
dc.contributor.authorTam, Kam C.en_US
dc.contributor.authorRojas, Orlando J.en_US
dc.contributor.authorKamkar, Miladen_US
dc.contributor.authorSundararaj, Uttandaramanen_US
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.contributor.groupauthorBio-based Colloids and Materialsen
dc.contributor.organizationUniversity of Calgaryen_US
dc.contributor.organizationUniversity of British Columbiaen_US
dc.date.accessioned2023-05-17T07:52:16Z
dc.date.available2023-05-17T07:52:16Z
dc.date.embargoinfo:eu-repo/date/embargoEnd/2025-04-26en_US
dc.date.issued2023-06-15en_US
dc.descriptionFunding Information: The authors gratefully acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant 05503/2020 , the Canada Excellence Research Chair Program ( CERC-2018-00006 ) and Canada Foundation for Innovation (Project number 38623 ). We acknowledge Ms. Xun Niu for her assistance with mechanical testing, and Ms. Faezeh Bakhshi for help with drawing the schematics. Publisher Copyright: © 2023 Elsevier Ltd
dc.description.abstractWe report on the design and synthesis of bio-based, electrically conductive green inks for direct ink writing (DIW) of lightweight electronics and electromagnetic interference (EMI) shields. The inks incorporate fibrillated cellulose and electrochemically synthesized graphene oxide (EGO), with no production and/or consumption of hazardous chemicals. The cellulosic component, TOCNF ((2,2,6,6-tetrame-thylpiperidin-1-yl) oxidanyl (TEMPO)-oxidized cellulose nanofibrils), improves the colloidal dispersion and the rheological properties of EGO-based inks for high-resolution 3D printing via DIW. The printing fidelity and shape retention significantly rely on the EGO/TOCNF loading and ratio in the precursor hydrogel inks. Aerogels result from freeze drying, allowing the production of 3D ultra-lightweight materials with prescribed macro-scale design featuring excellent stability and ease of handling. It is shown that the nano- and micro-scale design of the aerogels can be readily tuned by the solid content and EGO/TOCNF ratio in the inks. This multi-scale materials design provides a unique opportunity to control the mechanical and electrical properties of the printed structures. For instance, aerogels with compression modulus in the range of 250–1096 kPa are obtained based on the composition of the inks. For the optimized ink, an excellent EMI shielding effectiveness, as high as 55.6 dB, is achieved.en
dc.description.versionPeer revieweden
dc.identifier.citationErfanian, E, Moaref, R, Ajdary, R, Tam, K C, Rojas, O J, Kamkar, M & Sundararaj, U 2023, ' Electrochemically synthesized graphene/TEMPO-oxidized cellulose nanofibrils hydrogels: Highly conductive green inks for 3D printing of robust structured EMI shielding aerogels ', Carbon, vol. 210, 118037 . https://doi.org/10.1016/j.carbon.2023.118037en
dc.identifier.doi10.1016/j.carbon.2023.118037en_US
dc.identifier.issn0008-6223
dc.identifier.issn1873-3891
dc.identifier.otherPURE UUID: aeb84f44-fa35-449a-87b8-930645d31134en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/aeb84f44-fa35-449a-87b8-930645d31134en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85153571417&partnerID=8YFLogxKen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/120820
dc.identifier.urnURN:NBN:fi:aalto-202305173157
dc.language.isoenen
dc.publisherElsevier Ltd
dc.relation.ispartofseriesCarbonen
dc.relation.ispartofseriesVolume 210en
dc.rightsembargoedAccessen
dc.subject.keywordAerogelen_US
dc.subject.keywordCellulose nanofibrilen_US
dc.subject.keywordCompression modulusen_US
dc.subject.keywordConductive inken_US
dc.subject.keywordDirect ink writingen_US
dc.subject.keywordElectrochemical exfoliationen_US
dc.subject.keywordElectromagnetic shielden_US
dc.subject.keywordEMI Shieldingen_US
dc.subject.keywordGraphene oxideen_US
dc.subject.keywordRheologyen_US
dc.titleElectrochemically synthesized graphene/TEMPO-oxidized cellulose nanofibrils hydrogels: Highly conductive green inks for 3D printing of robust structured EMI shielding aerogelsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
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[article-cris] Kemian tekniikan korkeakoulu / CHEM