title: Light controllable surface coating for effective photothermal killing of bacteria.
abstract: Although the electronic properties of conducting films have been widely explored in optoelectronic fields, the optical absorption abilities of surface-coated films for photothermal conversion have been relatively less explored in the production of antibacterial coatings. Here, we present catechol-conjugated poly(vinylpyrrolidone) sulfobetaine (PVPS) and polyaniline (PANI) tightly linked by ionic interaction (PVPS:PANI) as a novel photothermal antibacterial agent for surface coating, which can absorb broadband near-infrared (NIR) light. Taking advantage of the NIR light absorption, this coating film can release eminent photothermal heat for the rapid killing of surface bacteria. The NIR light triggers a sharp rise in photothermal heat, providing the rapid and effective killing of 99.9% of the Gram-positive and -negative bacteria tested within 3 min of NIR light exposure when used at the concentration of 1 mg/mL. Although considerable progress has been made in the design of antibacterial coatings, the user control of NIR-irradiated rapid photothermal destruction of surface bacteria holds increasing attention beyond the traditional boundaries of typical antibacterial surfaces.
authors.forename: Sung Han
authors.initials: SH
authors.lastname: Kim
authors.forename: Eun Bi
authors.initials: EB
authors.lastname: Kang
authors.forename: Chan Jin
authors.initials: CJ
authors.lastname: Jeong
authors.affiliation: ∥Department of Chemistry, KAIST, Daejeon 305-701, Republic of Korea.
authors.forename: Shazid Md
authors.initials: SM
authors.lastname: Sharker
authors.forename: Insik
authors.initials: I
authors.lastname: In
authors.forename: Sung Young
authors.initials: SY
authors.lastname: Park
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000254:growth & development; D004203:Disinfection / Q000295:instrumentation / Q000379:methods*; D006358:Hot Temperature; D007259:Infrared Rays
chemical_list: D000900:Anti-Bacterial Agents
keywords: NIR; antibacterial coating; catechol; photothermal; polyaniline