الفهرس 
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Abstract
The aims of this research are: • Synthesis of high quality mesoporous silica nanospheres (MSNs) material with high surface area. • characterization of the prepared mesoporous silica nanospheres (MSNs) by diverse techniques, confirming the formation of the structure, their porosity and its functionalization including (TEM), (PXRD), N2 sorption and (SEM). • Addition of some compounds on the surface of the MSNs and using it as a sensor. • Optimizing the condition for high sensitive determination of Nitrite (NO2ˉ) ions using the prepared sensor. • Identification of the sensors and its properties.