Rational Strategy for Space-Confined Seeded Growth of ZnO Nanowires in Meter-Long Microtubes

Ryoma Kamei, Takuro Hosomi, Eisuke Kanao, Masaki Kanai, Kazuki Nagashima, Tsunaki Takahashi, Guozhu Zhang, Takao Yasui, Jun Terao, Koji Otsuka, Yoshinobu Baba, Takuya Kubo, Takeshi Yanagida

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Seeded crystal growths of nanostructures within confined spaces offer an interesting approach to design chemical reaction spaces with tailored inner surface properties. However, such crystal growth within confined spaces tends to be inherently difficult as the length increases as a result of confinement effects. Here, we demonstrate a space-confined seeded growth of ZnO nanowires within meter-long microtubes of 100 μm inner diameter with the aspect ratio of up to 10 »000, which had been unattainable to previous methods of seeded crystal growths. ZnO nanowires could be grown via seeded hydrothermal crystal growth for relatively short microtubes below the length of 40 mm, while any ZnO nanostructures were not observable at all for longer microtubes above 60 mm with the aspect ratio of 600. Microstructural and mass spectrometric analysis revealed that a conventional seed layer formation using zinc acetate is unfeasible within the confined space of long microtubes as a result of the formation of detrimental residual Zn complex compounds. To overcome this space-confined issue, a flow-assisted seed layer formation is proposed. This flow-assisted method enables growth of spatially uniform ZnO nanowires via removing residual compounds even for 1 m long microtubes with the aspect ratio of up to 10 »000. Finally, the applicably of ZnO-nanowire-decorated long microtubes for liquid-phase separations was demonstrated.

Original languageEnglish
Pages (from-to)16812-16819
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number14
Publication statusPublished - Apr 14 2021

All Science Journal Classification (ASJC) codes

  • General Materials Science


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