Novel synthesis technologies for two-dimensional transition metal dichalcogenides and their heterostructures

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorBai, Xueyin
dc.contributor.departmentElektroniikan ja nanotekniikan laitosfi
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen
dc.contributor.labPhotonics Groupen
dc.contributor.schoolSähkötekniikan korkeakoulufi
dc.contributor.schoolSchool of Electrical Engineeringen
dc.contributor.supervisorSun, Zhipei, Prof., Aalto University, Department of Electronics and Nanoengineering, Finland
dc.date.accessioned2022-11-15T10:00:07Z
dc.date.available2022-11-15T10:00:07Z
dc.date.defence2022-12-02
dc.date.issued2022
dc.description.abstractTwo-dimensional (2D) materials, especially 2D transition metal dichalcogenides (TMDs), have been recently expected to play important roles in future applications due to their atomic-thickness nanostructure and various physical properties. Chemical vapour deposition (CVD) is considered to be the most promising synthesis method for two-dimensional materials, due to the best balance between yield and quality of the products. Hence, this thesis focuses on two novel CVD methods for synthesising TMDs and their heterostructures. The first one is molten salt-assisted chemical vapour deposition (Salt 2.0). By applying the Salt 2.0 technique, an abnormal anti-pyramid stacked MoS2/WS2 heterostructure and a MoS2/double-wall carbon nanotube mix-dimensional heterostructure with negative photoresponse are synthesised respectively. These heterostructures can provide new approaches for engineering two-dimensional nanoelectronic devices.Another technique is gas-phase chemical vapour deposition (GCVD). Different from other synthesis methods, the GCVD technique can continuously produce clean and large-mass TMD nanoflakes in aerosols which can be simply collected by a filter for device fabrication and integration at room temperature. A demonstration is achieved for producing MoS2 nanoflakes in the gas phase with an output of up to 24 μg.min-1. The MoS2 nanoflakes have comparable sizes and qualities to the ones from current methods, promising their potential to replace the current MoS2 materials in many applications. In addition, the synthesis without substrate provides a better understanding of the nucleation and growth mechanism in the synthesis of TMDs. The extension of an available novel method and the development of a completely new method provide new approaches for the synthesis of TMDs and other 2D materials.en
dc.format.extent130 + app. 44
dc.format.mimetypeapplication/pdfen
dc.identifier.isbn978-952-64-1017-3 (electronic)
dc.identifier.isbn978-952-64-1016-6 (printed)
dc.identifier.issn1799-4942 (electronic)
dc.identifier.issn1799-4934 (printed)
dc.identifier.issn1799-4934 (ISSN-L)
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/117736
dc.identifier.urnURN:ISBN:978-952-64-1017-3
dc.language.isoenen
dc.opnMattevi, Cecilia, Dr., Imperial College London, UK
dc.publisherAalto Universityen
dc.publisherAalto-yliopistofi
dc.relation.haspart[Publication 1]: Xueyin Bai, Shisheng Li, Susobhan Das, Luojun Du, Yunun Dai, Lide Yao, Ramesh Raju, Mingde Du, Harri Lipsanen and Zhipei Sun. Singlestep chemical vapour deposition of anti-pyramid MoS2/WS2 vertical heterostructures. Nanoscale, 13, 8, 4537-4542, 2021. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202103222464. DOI: 10.1039/d0nr08281c
dc.relation.haspart[Publication 2]: Xueyin Bai, Zhenyu Xu, Qiang Zhang, Shisheng Li, Yunyun Dai, Xiaoqi Cui, Hoon Hahn Yoon, Lide Yao, Hua Jiang, Mingde Du, Yi Zhang, Esko I. Kauppinen and Zhipei Sun. Molybdenum disulfide/double-Wall carbon nanotube mixed-dimensional heterostructures. Advanced MaterialsInterfaces, 9, 13, 202200193, 2022. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202204062722. DOI: 10.1002/admi.202200193
dc.relation.haspart[Publication 3]: Xueyin Bai, Qiang Zhang, Xiaoqi Cui, Zhenyu Xu, Jiancheng Zheng, Mingde Du, Hoon Hahn Yoon, Shisheng Li, Juan Arias Muñoz, Yi Zhang, Hua Jiang, Jouko Lahtinen, Esko I. Kauppinen and Zhipei Sun. Continuous production of high-quality few-layer MoS2 nanoflakes via gasphasechemical vapour deposition. Submitted to Nature Synthesis, 13 pages, 2022
dc.relation.haspart[Publication 4]: Yi Zhang, Xueyin Bai, Juan Camilo Arias Muñoz, Yunyun Dai, Susobhan Das, Yadong Wang and Zhipei Sun. Coherent modulation of chiral nonlinear optics with crystal symmetry. Light: Science & Applications, 11, 216, 2022. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202208104665. DOI: 10.1038/s41377-022-00915-4
dc.relation.ispartofseriesAalto University publication series DOCTORAL THESESen
dc.relation.ispartofseries165/2022
dc.revZhai, Tianyou, Prof., Huazhong University of Science and Technology, People's Republic of China
dc.revKordas, Krisztian, Prof., University of Oulu, Finland
dc.subject.keywordchemical vapour depositionen
dc.subject.keywordtransition metal dichalcogenideen
dc.subject.keywordsalt-assisted chemical vapour depositionen
dc.subject.keywordgas-phase chemical vapour depositionen
dc.subject.otherElectrical engineeringen
dc.titleNovel synthesis technologies for two-dimensional transition metal dichalcogenides and their heterostructuresen
dc.typeG5 Artikkeliväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotDoctoral dissertation (article-based)en
dc.type.ontasotVäitöskirja (artikkeli)fi
local.aalto.acrisexportstatuschecked 2022-12-02_0807
local.aalto.archiveyes
local.aalto.formfolder2022_11_15_klo_10_55
local.aalto.infraOtaNano
local.aalto.infraOtaNano - Aalto Nanofab/Micronova
local.aalto.infraOtaNano - Nanomicroscopy Center
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