| Popis: |
The results obtained using a variety of new solid supports for the preparation of surface-enhanced Raman-active substrates via direct chemical reduction of silver salts and by vacuum vapor deposition of metallic silver are presented. These supports include two small pore size cellulose filter papers and frosted glass slides. These supports yield silver substrates with a much more uniform silver particle size and distribution than observed on previously used supports such as Whatman No. 1 and No. 5 filter papers. Results obtained using a solid silver membrane filter are also presented. These substrates provide metal particle morphology which is uniform on a submicrometer scale. This degree of uniformity is necessary for enhancing the reproducibility of SERS using a Raman microprobe since the area probed by this microprobe is 5–10 μm2. By using filter papers and glass slides, coupled with the vapor deposition and chemical reduction techniques, the resulting substrates are also fast, simple, and inexpensive, making them ideal candidates for routine analysis. |
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