Tailored Structure and Antibacterial Properties of Silica-Coated Silver Nanoplates by Pulsed Laser Irradiation

Emi Takeda; Wei Xu; Mitsuhiro Terakawa; Takuro Niidome

doi:10.1021/acsomega.1c07058

Tailored Structure and Antibacterial Properties of Silica-Coated Silver Nanoplates by Pulsed Laser Irradiation

ACS Omega. 2022 Feb 18;7(8):7251-7256. doi: 10.1021/acsomega.1c07058. eCollection 2022 Mar 1.

Authors

Emi Takeda¹, Wei Xu¹, Mitsuhiro Terakawa^{2

3}, Takuro Niidome¹

Affiliations

¹ Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan.
² School of Integrated Design Engineering, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
³ Department of Electronics and Electrical Engineering, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.

Abstract

We coated triangular-shaped silver nanoparticles, a type of anisotropic nanoplate (NPL), with silica (i.e., prepared Ag@SiO₂ NPLs). When we irradiated Ag@SiO₂ NPLs with nanosecond-pulsed laser light for 10 s, the triangular shape changed to spherical because of the photothermal effect. A high laser power exposed the silver core, and the particles exhibited strong antimicrobial activity. In contrast, at a moderate laser power, the silica layer crystallized, and the particles' antimicrobial activity decreased. Thus, a combination of Ag@SiO₂ NPLs and an appropriately tuned power of pulsed laser irradiation facilitated a decreased or an increased antimicrobial activity.