title: Unexpected Efficient Synthesis of Millimeter-Scale Single-Wall Carbon Nanotube Forests Using a Sputtered MgO Catalyst Underlayer Enabled by a Simple Treatment Process.
abstract: An unexpected 5000% increase in growth efficiency and high (95%) single-wall selectivity synthesis of vertically aligned carbon nanotubes (CNTs) was shown from Fe catalysts supported on a sputtered MgO underlayer from a simple underlayer treatment, i.e., annealing treatment. In this way, millimeter-scale single-wall carbon nanotube "forests" could be synthesized in a 10 min time, which has never been previously reported for MgO catalyst underlayer or any underlayer besides Al2O3. This level of efficiency and characterized SWCNT properties were similar to those grown using Al2O3underlayers. Spectroscopic and microscopic analyses revealed that the treatment improved stability of the catalyst nanoparticle array by the suppressing catalyst subsurface diffusion and retaining the metallic state of the surface Fe atoms. Taken together, these results reveal a new route in achieving highly efficient SWCNT synthesis.
authors.affiliation: CNT-Application Research Center, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.|Research Association for Single Wall Carbon Nanotubes (TASC) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Tsuji
authors.affiliation: CNT-Application Research Center, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.|Research Association for Single Wall Carbon Nanotubes (TASC) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Hata
authors.affiliation: CNT-Application Research Center, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.|Research Association for Single Wall Carbon Nanotubes (TASC) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Don N
authors.initials: DN
authors.lastname: Futaba
authors.affiliation: CNT-Application Research Center, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.|Research Association for Single Wall Carbon Nanotubes (TASC) , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Shunsuke
authors.identifier: 0000-0002-0465-3274
authors.initials: S
authors.lastname: Sakurai