Fabrication of Silica Nanoparticle Monolayer Arrays Using an Anodic Aluminum Oxide Template

Kazutoshi Sekiguchi; Takayuki Nakanishi; Hiroyo Segawa; Atsuo Yasumori

doi:10.1021/acsomega.9b02114

Fabrication of Silica Nanoparticle Monolayer Arrays Using an Anodic Aluminum Oxide Template

ACS Omega. 2019 Aug 22;4(10):14333-14339. doi: 10.1021/acsomega.9b02114. eCollection 2019 Sep 3.

Authors

Kazutoshi Sekiguchi^{1

2}, Takayuki Nakanishi¹, Hiroyo Segawa^{1

3}, Atsuo Yasumori¹

Affiliations

¹ Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
² Materials Research Laboratories, Nissan Chemical Corporation, 488-6 Suzumi-cho, Funabashi, Chiba 274-0052, Japan.
³ National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

Abstract

Non-close-packed (NCP) silica nanoparticle monolayer arrays (SNMA) on ordered porous anodic aluminum oxide (AAO) templates were fabricated for the first time by a novel two-step spin-coating technique. The obtained NCP-SNMA-AAO was composed of silica nanoparticles (average primary particle size of 440 nm) and well-organized nanopores on the AAO substrates. NCP-SNMA-AAO with a supporting ratio of 87% silica nanoparticles showed a hydrophilic surface (water contact angle of 51.0°), while the original AAO substrate shows a hydrophobic surface (water contact angle of 107.9°). The maximum coefficient of static friction was decreased by 29% (0.327 → 0.233). The coefficient of dynamic friction was also decreased by 20% (0.281 → 0.226). We found that controlling the silica supporting ratio using the two-step spin-coating technique is an effective approach for surface modification of an AAO substrate.