Halloysite nanotubes with immobilized silver nanoparticles for anti-bacterial application

• Published in: Colloids and surfaces, B, Biointerfaces Vol. 151; pp. 249 - 254
• Main Authors: Jana, Subhra, Kondakova, Anastasiya V., Shevchenko, Svetlana N., Sheval, Eugene V., Gonchar, Kirill A., Timoshenko, Victor Yu, Vasiliev, Alexander N.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.03.2017
• Subjects: Aluminum Silicates - chemistry; Anti-Bacterial Agents - chemistry; Bactericidal effect; Escherichia coli - drug effects; Halloysite clay; Immobilization; Light; Metal nanoparticles; Metal Nanoparticles - chemistry; Microscopy, Electron, Transmission; Nanocomposites - chemistry; Nanotubes - chemistry; Optics and Photonics; Plasmonic; Silver - chemistry; Spectroscopy, Fourier Transform Infrared; Surface Properties; Wet chemistry; X-Ray Diffraction; Metal nanoparticles; Immobilization; Halloysite clay; Wet chemistry; Plasmonic; Bactericidal effect
• ISSN: 0927-7765; 1873-4367
• DOI: 10.1016/j.colsurfb.2016.12.017

[Display omitted] •Ag nanoparticles are immobilized over the external surfaces of halloysite.•Results in the formation of an efficient and environmentally benign nanocomposite.•Exhibits plasmonic resonance in the visible spectral region.•Bactericidal effect of HNTs-Ag indicates a role of plasmonic excitation of Ag NPs.•Findings shed light on the anti-bacterial activity of the nanocomposites. Halloysite nanotubes (HNTs) with immobilized silver (Ag) nanoparticles (NPs) were prepared by methods of wet chemistry and were characterized by using the transmission electron microscopy, x-ray diffraction, optical spectroscopy and experiments with E. coli bacteria in-vitro. It was found that Ag NPs with almost perfect crystalline structure and sizes from ∼9nm were mainly attached over the external surface of HNTs. The optical absorption measurement revealed a broad plasmonic resonance in the region of 400–600nm for HNTs with Ag NPs. The later samples exhibit bactericidal effect, which is more pronounced under illumination. A role of the plasmonic excitation of Ag NPs for their bioactive properties is discussed. The obtained results show that Ag NPs–decorated HNTs are promising agents for the antibacterial treatment.