Photoluminescence response of terbium-exchanged MFI-type materials to Si/Al ratio, texture and hydration state
Article Abstract:
Terbium-exchanged MFI zeolite type materials, microporous-mesoporous Zeolite-1 with the Si/Al ratio in the range of 33-200, Zeogrid with the Si/Al ratio of 75 and nanocrystalline MFI with Si/Al ratio 75 were prepared via an ion exchange procedure and investigated by time resolved photoluminescence techniques. The results show that, in Zeolite 1 and Zeogrid, two distinct locations of [Tb.sup.3+] exist which might correlate with two types of exchange sites, one on the internal surface of mesopores, the other inside the pores while for MFI, the site predominate inside the pores.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Time-resolved photoluminescence characteristics of subnanometer ZnO clusters confined in the micropores of zeolites
Article Abstract:
Subnanometric ZnO clusters confined in different micropore zeolites are studied by photoluminescence (PL) spectroscopy. The results show that the subnanometric ZnO clusters display significantly different optical behaviors from macrocrystalline ZnO, mainly due to the quantum confinement effect. The dependence of luminescence lifetime on the amount of ZnO in zeolites indicates that the electron-photon interactions between the ZnO clusters and the zeolite host significantly affect the dynamic relaxation process of ZnO clusters.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Water exclusion at the nanometer scale provides long-term passivation of silicon (111) grafted with alkyl monolayers
Article Abstract:
Si(111)-alkyl layer interfaces are prepared with a very low density of electronic traps after careful control of the grafting conditions. Water exclusion from the monolayer has promoted long-term passivation of the silicon surface against oxidation in air and water as well as perfect corrosion inhibition in 20% NH4F.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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