Photoelectrochemistry of Quantized WO3 Colloids: Electron Storage, Electrochromic, and Photoelectrochromic Effects

摘要: Electron storage effects in quantized WO[sub 3] colloids have been investigated by spectroelectrochemical and photochemical methods. Electrons trapped within the colloidal particles exhibit blue coloration with absorption red-IR region. From picosecond laser flash photolysis experiments, we estimate rate constant for electron trapping to be 10[sup 10] s[sup [minus]1]. These electrons are stable an inert atmosphere can utilized reduce substrates such as thiazine oxazine dyes which reduction potentials less negative than conduction band of 3]. The constants heterogeneous transfer at semiconductor/electrolyte interface range (0.7-2.4) [times] 9] M[sup [minus]1] 43 refs., 10 figs., 1 tab.