Silver, colloidal, electron micrographs

Fig. 3. Electron micrographs of colloidal silver nuclei after 21 hours physical development. Gold shadowing at a 20° angle was used to indicate the thickness of the crystals.

Figure 10.2. Electron micrographs of typical colloidal gold and silver particle structures used in SERS experiments. (a) Colloidal gold particles in the isolated and aggregated stage after addition of NaCl. (b) Typical colloidal silver clusters exhibiting strong SERS enhancement. (With permission from Refs. 17 and 18.)...

Figure 10.8. SERS spectra of (a) 10-6 M crystal violet on isolated silver spheres and (b) 10-8 M crystal violet on small colloidal silver clusters. The insets show electron micrographs of the SERS-active architectures. (With permission from Ref. 34.)...

As an illustration of the use of SEM, micrographs obtained from the characterization of silica materials are described here [47], This SEM study was carried out with a JEOL 5800 LV model SEM. The acceleration of the electron beam was 20 kV. The sample grains were glued with silver colloid to the sample holder and were coated at vacuum by cathode sputtering with a 30-40 am gold film [47], in order to make the nonconducting silica powder sample conductive. 

Figure 6-18. Transmission electron micrographs of decahedral silver colloid crystallites. The smaller particle a) is a perfect decahedron, the larger b) retains a residual fivefold axis but is a sevenfold twin with clear discontinuities (Reproduced by permission from ref. [71].)...

Crystal size distribution in colloidal silver (d) from electron micrograph class, 4 A (b) from X-ray line-broadening of the (111) reflection class breadths, 12 A. 

Fig. 10. Electron micrographs of colloidal silver iodide (diameter 100 - 800 A) and of colloidal silver (diameter of primary particles about 150 A), a. Silver iodide Pt shadowed 10,000 x. b. Silver 32,000 x.

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