Cone-shaped pores as well as cylindrical pores with tapered ends of various
geometrical forms were produced via one-side etching of latent ion tracks
in thin polymer foils by applying a hydrostatically controlled, neutralizin
g counter solution on the membrane side opposite to the etchant. The sizes
and shapes of the pores depend on the specific composition and the hydrosta
tic pressure of the counter solution, and the time of etching. Metal replic
ation of such pores provides two-dimensional arrays of sharp whiskers that
may serve as electron emitters, being of interest for applications in elect
ronics. (C) 2001 American Vacuum Society.