Surface modification of the quasi one-dimensional metal oxides and DNA for chemical and biological sensors.

    The quasi one-dimensional (1D) of semiconductor crystals on the basis of oxides of tin dioxide , and indium oxide thickness of 100 - 200 nm were grown from the vapor by the vapor-liquid-solid reactor in the gaseous mixture of argon- oxygen under conditions of controlled temperature gradient in the range 800 - 1200ºC . As the starting material used particularly pure metal oxides . The flow rate of carrier gas was controlled by electronic flow meters with an accuracy of + 1 ml/min. By scanning and transmission electron microscopy and X-ray diffraction carried out a systematic study of morphology and composition of the crystal phase depending on the quantity of flow of the carrier gas ( argon ) .

    High perfection of the structure (1D) single crystals was proved by transmission electron microscopy and high-resolution electron diffraction. Surface of whiskers on the basis of pure and doped SnO₂ and In₂O₃ organically modified receptors: organic complexes of Cu (II) ( phthalocyanato , hexene and benzenporfirinaty ), as well as a complex of Fe (II) with 2,6-dimethylpyridin. Monocrystalline thread tin dioxide modified as photochromic polymer coatings based polyvinylmethylsilasane with and without amine dye.

    By fluorescence microscopy showed that polivinildimetilsilazan covalently bonded to the surface of SnO₂, in turn, as the dye covalently bonded to polyvinylmethylsilasane coating. The thermal stability of hybrid nanocrystals according to the size of a semiconductor crystallite matrix. Testing of the sensory properties of whiskers and hybrid materials based upon detection of NO₂ in air and NH₃ ppm-ppb concentration range . It is shown that the materials of interest for chemical resistive type gas sensor with the optimum working temperature of 150 - 200 њ C.