title: Nanoscale size-selective deposition of nanowires by micrometer scale hydrophilic patterns.
abstract: Controlling the post-growth assembly of nanowires is an important challenge in the development of functional bottom-up devices. Although various methods have been developed for the controlled assembly of nanowires, it is still a challenging issue to align selectively heterogeneous nanowires at desired spatial positions on the substrate. Here we report a size selective deposition and sequential alignment of nanowires by utilizing micrometer scale hydrophilic/hydrophobic patterned substrate. Nanowires dispersed within oil were preferentially deposited only at a water/oil interface onto the hydrophilic patterns. The diameter size of deposited nanowires was strongly limited by the width of hydrophilic patterns, exhibiting the nanoscale size selectivity of nanowires deposited onto micrometer scale hydrophilic patterns. Such size selectivity was due to the nanoscale height variation of a water layer formed onto the micrometer scale hydrophilic patterns. We successfully demonstrated the sequential alignment of different sized nanowires on the same substrate by applying this size selective phenomenon.
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Yong
authors.initials: Y
authors.lastname: He
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Nagashima
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kanai
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Gang
authors.initials: G
authors.lastname: Meng
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Fuwei
authors.initials: F
authors.lastname: Zhuge
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Sakon
authors.initials: S
authors.lastname: Rahong
authors.affiliation: Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Li
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Tomoji
authors.initials: T
authors.lastname: Kawai
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yanagida
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