Photomicrograph of porous indium phosphide. The porous layers were formed on the surface of single-crystal indium phosphide by electrochemical etching in a hydrofluoric acid solution. Photos of nanostructures were obtained in scanning electron microscope JSM-6490 by the researchers of Berdyansk State Pedagogical University. The increase is 40,000 times. Feature of the existing structures is that the pores have a record small size - 40 nm, and the size of pores between crystallites (10-5) nm. These structures can be used as material for the creation of supersensitive sensors.