Immobilization of Highly Dispersed Ag Nanoparticles on Carbon Nanotubes Using Electron-Assisted Reduction for Antibacterial Performance

Abstract

Silver nanoparticles (Ag NPs) supported on certain materials have been widely used as disinfectants. Yet, to date, the antibacterial activity of the supported Ag NPs is still far below optimum. This is mainly associated with the easy aggregation of Ag NPs on the supporting materials. Herein, an electron-assisted reduction (EAR) method, which is operated at temperatures as low as room temperature and without using any reduction reagent, was employed for immobilizing highly dispersed Ag NPs on aminated-CNTs (Ag/A-CNTs). The average Ag NPs size on the EAR-prepared Ag/A-CNTs is only 3.8 nm, which is much smaller than that on the Ag/A-CNTs fabricated from the traditional thermal calcination (25.5 nm). Compared with Ag/A-CNTs fabricated from traditional thermal calcination, EAR-prepared Ag/A-CNTs shows a much better antibacterial activity to E. coli/S. aureus and antifouling performance to P. subcordiformis/T. lepidoptera. This is mainly originated from the significantly enhanced Ag(+) ion releasing rate and highly dispersed Ag NPs with small size on the EAR-prepared Ag/A-CNTs. The findings from the present work are helpful for fabricating supported Ag NPs with small size and high dispersion for efficient antibacterial process.

Removal of Noble Metal Ions (Ag+) by Mercapto Group-Containing Polypyrrole Matrix and Reusability of Its Waste Material in Environmental Applications

“…The interplanar spacing ( d -spacing) of Ag crystallites is clearly observed in the well-defined lattice fringes of the Ag NPs in Figure c. The d -spacing of the Ag crystallites was measured as 0.230 nm (inset, Figure c), which is consistent with the reported value of the (111) crystallographic plane of cubic Ag. , This result indicates that silver ions in the aqueous solution are adsorbed on the adsorbent surface and subsequently reduced to silver nanoparticles through electron reach groups of the polymer-based composite. To better understand the distribution of silver nanoparticles on the adsorbent surface, STEM analysis was executed.…”

Bifunctional Regenerated Cellulose/Polyaniline/Nanosilver Fibers as a Catalyst/Bactericide for Water Decontamination

“…Many efforts, especially of nanoscience and nanotechnologies, have been directed toward removing organic or bacterial contaminants from water. − Among them, metal nanoparticles (Ag, , Pt, etc.) have become a hot research topic due to their peculiar catalysis and high activity against a broad range of microbes and hazardous substances.…”

Antibacterial Hybrid Hydrogels

“…For example, Yan et al used the electron-assisted reduction method to fix highly dispersed silver nanoparticles (Ag NPs) on aminated carbon nanotubes (Ag/A-CNT) with an average Ag NP size of 3.8 nm. [28] With the rapid release of Ag + ions and the highly dispersed small-size Ag NPs, Ag/A-CNT exhibited a good antibacterial effect on Escherichia coli (E. coli) and S. aureus. The four resistance acquisition pathways, the four main mechanisms of resistance, and the five main targets for antibiotics.…”