Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5366481 | Applied Surface Science | 2012 | 5 Pages |
A simple method has been demonstrated to grow silver nanoparticles on the surface of cellulose fibers. The preparation is based on photo-activation of surface by ultraviolet (UV) photons, followed by chemical reduction of silver nitrate. It is found that the concentration of silver nitrate in the solution is not a determining factor, while UV intensity affects the rate of initial growth and determines the final concentration of the loaded silver. We explain the phenomena based on a model including the number of reducing sites on the surface of cellulose fibers activated by UV photons, and a release mechanism that causes a slow rate of dissolution of silver back into the solution.
⺠Here we use UV irradiation to make the surface of cellulose fibers reductive. ⺠This situation provides a self-limiting condition to form stable silver nanoparticles. ⺠It was shown that the determining parameter is UV intensity rather than Ag+ concentration. ⺠Grown silver nanoparticles on the cellulose surface are recognized by XPS, SEM and DRS.