Ellipsometric investigations of self-assembled monolayers (SAMs) of alkylsiloxanes on native silicon substrates and of organothiols on gold substrates were performed under in situ conditions with the substrate in direct contact with the adsorbate solution. Specially designed liquid cells matched for
Femtosecond studies of trapped electrons at the liquid—solid interface of aqueous CdS colloids
✍ Scribed by J.Z. Zhang; R.H. O'Neil; T.W. Roberti; J.L. McGowen; J.E. Evans
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 520 KB
- Volume
- 218
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We report the direct measurements of the dynamics of trapped electrons at the liquid-solid interface of aqueous CdS colloids on the femtosecond time scale. The trapped electrons are found to be generated in less than 100 fs. The majority of the trapped electrons decays in 10 ps through predominately electron-hole recombination, while a small fraction lives for longer than 1 ns.
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Infrared spectra are reported for silica in two states of surface hydroxylation immersed in carbon tetrachloride containing in particular ( \(\mathrm{MeO})_{3} \mathrm{SiCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\). Adsorption involved hydrogen bonding between silanol and \(\mathrm{OMe}
sors (Cd 2/ for CdS or Zn 2/ for ZnS) into the nanoreactors Adsorption isotherms have been determined for the binding of and on the extent of Cd 2/ (or Zn 2/ ) adsorption at the silica Cd 2/ onto the surfaces of hydrophilic A200 SiO 2 and hydrophobic particle interfaces. We have determined, therefor