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By Gary Hodes

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In the first case, the (in this case) electron donor (In3ϩ) is immobile, while the donated electron is mobile; if the electron is transferred to the liquid, then the solid will become positively charged. The same occurs for an illuminated solid where electron/hole formation occurs, if one of the charges is preferentially injected into the liquid. , trapped) charges will affect the double layer if the countercharge is (relatively) delocalized over the particle. The double layer close to a (near) surface-localized donor will be different than that for the rest of the particle.

However, even here, interpretation is not always straightforward. For example, the XRD pattern of a deposit of tall cylinders of small cross section will give a peak width characteristic of the height but not of the cross section (the latter will be seen in TEM images). Thus the TEM and XRD sizes will necessarily be different in such a case. Another example is where there is a mixture of large and small crystals. Even if the large crystals constitute a relatively small fraction of the total material, they may in some cases dominate the XRD pattern, since peak heights decrease with decreasing crystal size due to increase of peak width and (ideally) constant peak area for the same quantity of material.

Copyright © 2002 by Marcel Dekker, Inc. All Rights Reserved. Another cause of interest in this technique is due to the fact that the crystals in most as-deposited CD films are very small. Considering the current interest in nanoparticles, CD is an excellent technique to deposit nanocrystalline films. More specifically, if the nanocrystals are small enough, they exhibit size quantization, the most obvious manifestation of which is an increase in the optical bandgap with decrease in crystal size, as was shown for CD CdSe [17] and later for CD PbSe [18,19].

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