| Title | Synthesis, characterization, photocatalytic and antibacterial activities of Ag-doped ZnO powders modified with a diblock copolymer. |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Journal | Powder Technology |
| Volume | 219 |
| Pagination | 158 - 164 |
| Authors | Amornpitoksuk, Pongsaton, Sumetha Suwanboon, Suthinee Sangkanu, Ampaitip Sukhoom, Nantakan Muensit, and Jonas. Baltrusaitis |
| Publisher | Elsevier B.V. |
| ISBN Number | 0032-5910 |
| Keywords | silver doped zinc oxide photocatalyst prepn antibacterial activity |
| Abstract | Nanocryst. Ag-doped ZnO powders were prepd. directly from an aq. soln. of zinc acetate dihydrate and AgNO3 in the presence of poly(ethylene oxide)-b-poly(propylene oxide), (PEO)19-b-(PPO)3, and NaOH at 70°. The ZnO powders had an urchin-like shape without any dopant and this turned to an agglomerated rod-like structure when the Ag loading was ≤0.5 mol%. If the Ag content was further increased, the urchin-like shape reappeared. This may occur because the Ag aggregates at the grain boundary. The finding that the diam. of the urchin-like shape decreases as the Ag concns. increase, can be explained by the pinning effect of the Ag particles as obstacles that inhibit the grain migration and grain growth. An increase of the photocatalytic efficiency for degrading methylene blue increases with the Ag loading up to 1.0 mol% while the best of the antibacterial activity against Staphylococcus aureus was found at 0.5-0.8 mol% of Ag. However, the different Ag loadings in the ZnO powders had no effect on the antibacterial effect on Escherichia coli. [on SciFinder(R)] |