start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=5 article-no= start-page=1144 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=20200304 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Systematic Investigations of Annealing and Functionalization of Carbon Nanotube Yarns en-subtitle= kn-subtitle= en-abstract= kn-abstract=Carbon nanotube yarns (CNY) are a novel carbonaceous material and have received a great deal of interest since the beginning of the 21st century. CNY are of particular interest due to their useful heat conducting, electrical conducting, and mechanical properties. The electrical conductivity of carbon nanotube yarns can also be influenced by functionalization and annealing. A systematical study of this post synthetic treatment will assist in understanding what factors influences the conductivity of these materials. In this investigation, it is shown that the electrical conductivity can be increased by a factor of 2 and 5.5 through functionalization with acids and high temperature annealing respectively. The scale of the enhancement is dependent on the reducing of intertube space in case of functionalization. For annealing, not only is the highly graphitic structure of the carbon nanotubes (CNT) important, but it is also shown to influence the residual amorphous carbon in the structure. The promising results of this study can help to utilize CNY as a replacement for common materials in the field of electrical wiring. en-copyright= kn-copyright= en-aut-name=ScholzMaik en-aut-sei=Scholz en-aut-mei=Maik kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HayashiYasuhiko en-aut-sei=Hayashi en-aut-mei=Yasuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=EckertVictoria en-aut-sei=Eckert en-aut-mei=Victoria kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=KhavrusVyacheslav en-aut-sei=Khavrus en-aut-mei=Vyacheslav kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=LeonhardtAlbrecht en-aut-sei=Leonhardt en-aut-mei=Albrecht kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=BüchnerBernd en-aut-sei=Büchner en-aut-mei=Bernd kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=MertigMichael en-aut-sei=Mertig en-aut-mei=Michael kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=HampelSilke en-aut-sei=Hampel en-aut-mei=Silke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= affil-num=1 en-affil=Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstr. 20 kn-affil= affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstr. 20 kn-affil= affil-num=4 en-affil=Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstr. 20 kn-affil= affil-num=5 en-affil=Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstr. 20 kn-affil= affil-num=6 en-affil=Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstr. 20 kn-affil= affil-num=7 en-affil=Institute for Physical Chemistry, Technische Universität Dresden kn-affil= affil-num=8 en-affil=Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstr. 20 kn-affil= en-keyword=carbon nanotube yarns kn-keyword=carbon nanotube yarns en-keyword=carbon nanotube kn-keyword=carbon nanotube en-keyword=functionalization kn-keyword=functionalization en-keyword=electrical conductivity kn-keyword=electrical conductivity en-keyword=annealing kn-keyword=annealing en-keyword=acid treatment kn-keyword=acid treatment END