Carbon dioxide-assisted synthesis of single-walled carbon nanotubes and their thin film properties

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Jiang, Hua, Dr., Aalto University, Department of Applied Physics, Finland
dc.contributor.advisor Zhang, Qiang, Dr., Aalto University, Department of Applied Physics, Finland
dc.contributor.author Liao, Yongping
dc.date.accessioned 2019-09-13T09:01:23Z
dc.date.available 2019-09-13T09:01:23Z
dc.date.issued 2019
dc.identifier.isbn 978-952-60-8709-2 (electronic)
dc.identifier.isbn 978-952-60-8708-5 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/40231
dc.description.abstract Owing to their unique chemical and physical properties, single-walled carbon nanotubes (SWCNTs) have attracted increasing attentation in various fields. The properties of SWCNTs strongly depend on their chirality and geometry. Thus, to realize the applications in desired fields, it is of significant importance to tune the chirality and geometry of SWCNTs. The floating catalyst chemical vapor deposition (FC-CVD) method, as a dry and continuous process, has been widely used in academic and industrial fields. However, tuning the growth of SWCNTs in FC-CVD is a challenge. In this thesis, first of all, certain amounts of carbon dioxide (CO2) is introduced to tune the growth of SWCNTs in a FC-CVD reactor, where carbon monoxide (CO) is used as carbon source and ferrocene as catalyst precursor. We found that the SWCNT thin films display different colors with various CO2 concentration, specifically, a green and brown colors are observed . The optical absorption spectrum of the green film shows a distinct absorption peak in visible range. Further analyzing the chirality by electron diffraction reveals that the green film possesses a very narrow chirality distribution near armchair. Besides the chirality, we also studied the geometry, such as tube diameter, bundle length and diameter, modulated by CO2. The SWCNT diameter and bundle length are found to increase with CO2 concentration. In addition, the yield and bundle diameter are also affected by CO2. Accordingly, SWCNT thin film prepared with certain CO2 concetration displays a remarkably reduced sheet resistance. Therefore, employing CO2 offers new strategy to tune the chirality and geometry of SWCNTs in FC-CVD. Furthermore, we also deposited our aerosol SWCNTs on wafer-scale substrates by large-scale thermophoretic precipitator (TP), such SWCNT thin films display ideal uniformity and conductivity. The scale-up deposition method is applicable in industrial productions of SWCNT transparent conductive films. To futher reduce the sheet resistance of SWCNT thin films, we then deposited SWCNTs on graphene by TP. The SWCNTs/graphene hybrid film exhibits improved conductivity. By measuring the temperature dependent conductance, we found that due to the presence of graphene, the tunnelling barrier between tubes has been reduced, which enhances the carrier tunnelling efficiency and thus, improves the conductivity. en
dc.format.extent 68 + app. 52
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 162/2019
dc.relation.haspart [Publication 1]: Liao, Yongping; Jiang, Hua; Wei, Nan; Laiho, Patrik; Zhang, Qiang; Khan, Sabbir A.; Kauppinen, Esko I. Direct synthesis of colorful singlewalled carbon nanotube thin films. American Chemical Society. Journal of the American Chemical Society, 2018, volume 140, issue 31, pages 9797-9800. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201808214617.DOI: 10.1021/jacs.8b05151
dc.relation.haspart [Publication 2]: Liao, Yongping; Hussain, Aqeel; Laiho, Patrik; Zhang, Qiang; Tian, Ying; Wei, Nan; Ding, Er-Xiong; Khan, Sabbir A.; Nguyen, Nguyen Ngan; Ahmad, Saeed; Kauppinen, Esko I. Tuning geometry of SWCNTs by CO2 in floating catalyst CVD for high-performance transparent conductive films. Advanced Materials Interfaces, 2018, volume 5, issue 23, pages 1801209. DOI: 10.1002/admi.201801209
dc.relation.haspart [Publication 3]: Laiho, Patrik; Rafiee, Mahdi; Liao, Yongping; Hussain, Aqeel; Ding, Er-Xiong; Kauppinen, Esko I. Wafer-scale thermophoretic dry deposition of single-walled carbon nanotube thin films. ACS Omega, 2018, volume 3, issue 1, pages 1322-1328. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201802091299. DOI: 10.1021/acsomega.7b01869
dc.relation.haspart [Publication 4]: Liao, Yongping; Mustonen, Kimmo; Tulic, Semir; Skakalova, Viera; Khan, Sabbir A.; Laiho, Patrik; Zhang, Qiang; Li, Changfeng; Monazam, Mohammad R.A.; Kotakoski, Jani; Lipsanen, Harri; Kauppinen, Esko I. Enhanced tunnelling in a hybrid of single-walled carbon nanotubes and graphene. 2019. Submitted to ACS Nano.
dc.subject.other Physics en
dc.title Carbon dioxide-assisted synthesis of single-walled carbon nanotubes and their thin film properties en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword single-walled carbon nanotubes en
dc.subject.keyword carbon dioxide en
dc.subject.keyword chirality en
dc.subject.keyword geometry en
dc.subject.keyword transparent conductive film en
dc.subject.keyword graphene en
dc.subject.keyword tunnelling en
dc.identifier.urn URN:ISBN:978-952-60-8709-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Kauppinen, Esko I., Prof., Aalto University, Department of Applied Physics, Finland
dc.opn Vilatela, Juan J., Dr., IMDEA Materials Institute, Spain
dc.contributor.lab NanoMaterials Group en
dc.rev Chen, Yuan, Prof., University of Sydney, Australia
dc.rev Futaba, Don N., Dr., National Institute of Advanced Industrial Science and Technology (AIST), Japan
dc.date.defence 2019-09-27
local.aalto.acrisexportstatus checked 2019-10-30_1505


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