Palladium, Indium and Silver-doped SnO 2 thin film was deposited by chemical spray pyrolysis on ITO and porous silicon substrates to be a fast MgSO 4 Á7H 2 O amperometric biosensor. The prepared SnO 2 films were doped by dipping in palladium chloride PdCl 2 , indium chloride, InCl 3 and silver nitrides AgNO 3 dissolved in ethanol C 2 H 5 OH. The structural and optical properties of the prepared films were studied. The sensitivity behaviors of SnO 2 , SnO 2 : Pd, SnO 2 : In and SnO 2 : Ag based on the amperometric biosensor to MgSO 4 Á7H 2 O salts were investigated at room temperature with different doping.

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Copper oxides are one of the metal oxides , that has been studied for several reasons such as the nature and their reasonably good electrical and optical properties by Cu2O Copper formed two known oxides : cupric (CuO) and curprous (Cu2O) were p-type with a band gap energy 1.21 to 1.51 eV and 2.1 to 2.6 eV respectively [1-3]. On the other hand CuO with different nanoshape has been synthesized by different methods in many research papers [4-10]

Manganse Oxide nanoparticles from different phase have been prepared by simple chemical method with different temperature. The cubic MnO nanoparticles synthesis from 600°C and transformation to tetragonal MnO2nanopaticles and transformation at 800°C to cubic Mn2O3 nanoparticles. X-ray diffraction and FTIR and UV-Visible have been investigated and crystallite size was calculated using Debye-Scherers equation and it is found to be around (23.4-25.66)nm