ADSORPTION-INDUCED ELECTRICAL-CONDUCTIVITY OF SOME FERROCENE DERIVATIVES - RATES OF ADSORPTION AND DESORPTION OF VAPORS

The change in dark conductivity of some ferrocene derivatives on adsorption of some organic solvent has been studied in sandwich cell configurations at different cell temperatures. Appreciable enhancements in the dark conductivity are observed. Such enhancement depends on the amount of adsorbed vapor, cell temperature as well as the chemical nature of the adsorbate. The sensitivity towards a vapor is also found to vary depending on the nature of the substituent groups in the ferrocene ring. Both the adsorption and desorption rates follow the modified Roginsky-Zeldovich equation. The temperature dependence and the nature of the solid-vapor interaction have been deduced from the rate data analysis.