Teflon etchants

Teflon and other fluorocarbon surfaces may be altered by chemical treatments using solvent solutions of sodium naphthalene complex or molten sodium. Teflon etchants, for example, Tetra-Etch , a tradename and product of W. L. Gore Associates, are effective in improving adhesion to Teflon. Oxidation treatments for metals such as copper or aluminum also produce highly polar oxide surfaces that are more easily bondable. The reader is referred to several sources for a more comprehensive... 

The choice of a cell will be largely dependent on the type of processing to be accomplished. An example used in our laboratory for etching diffraction gratings is illustrated in Figure 1. The cell body should be machined from a polymer stable to the electrolyte of choice. Examples are nylon for many aqueous electrolytes and Teflon for HF-based etchants or nonaqueous media. The semiconductor electrodes must be mounted in such a way to prevent contamination of the ohmic contact (or other corrosive elements) by the electrolyte. In the approach illustrated in... 

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