Mediated Oxidation and Determination of Gaseous Monomethyl Hydrazine in a Solid-State Voltammetric Cell Employing a Sol-Gel Electrolyte

Mesoporous materials as gas sensors

“…Voltammetry was applied to measure gas-phase H 2 O 2 and hydrazine using mesoporous silica loaded with hygroscopic salts to control the amount of pore water and to pre-concentrate the analyte species, as mentioned above. 174,233 A rather unconventional gas-sensing method was introduced which employed measurement of the surface photo-voltage, a technique which is usually used in semiconductor physics for determination of mean free paths of minority charge carriers. By using mesoporous silica materials such as MCM-41 and SBA-16, NO and NO 2 gases were monitored in low concentrations at room temperature.…”

Exciting new directions in the intersection of functionalized sol–gel materials with electrochemistry

“…An approach similar to that for the CO sensor was used for determination of hydrogen peroxide 356 and monomethyl hydrazine. 357 The hydrogen peroxide sensor used a basecatalysed sol-gel process (using TEOS) to cast the film over a three-electrode assembly. The working electrode was Pt.…”

Electroanalysis with Pure, Chemically Modified and Sol-Gel-Derived Silica-Based Materials

“…Advances in this ®eld were essentially reported by the Cox's group [125,138,205]. Unmodi®ed silica containing liquid microphases was used as a solid electrolyte for the amperometric sensing of gaseous carbon monoxide [125] and hydrogen peroxide [138].…”

“…Unlike the Na®on-based sensors, the xerogel ®lms provided an amperometric response that was independent of changes in humidity. When adding iron(II) or a mixed valenceruthenium oxide in the bulk of this solid electrolyte, mediated oxidation and determination of gaseous monomethyl hydrazine can be carried out by amperometry [205]. The sensor was also sensitive to other gases as sulfur and nitrogen oxides.…”