Layer cake: Layered titanium and tungsten oxides modified by alkene and thiol groups, respectively, are exfoliated with organic solvent to form nanosheets, which are alternately stacked by a click reaction (see picture). The material enhances the photocatalytic decomposition of methylene blue.
The alternate layered structure was synthesized by the thiol−ene click reaction between the alkylthiol-modified tungsten oxide layer and the alkene-modified titanium oxide layer. The interlayer distances between the titanium oxide layer and the tungsten oxide layer were controlled to 0.72, 0.94, 1.01, and 1.14 nm by changing the carbon number of the functional groups. Photoinduced electron transfer from the titanium oxide layer to the tungsten oxide layer depends on the interlayer distance of the titanium oxide−tungsten oxide alternate layers from 0.7 to 1.1 nm. The alternate layers of narrow interlayer distance showed high photocatalytic activity in decomposition of methylene blue. The amount of the photoexcited electron transfer from titanium oxides to tungsten oxides was quantitatively measured by the reduction of Ag ions with the electrons stored in tungsten oxide. Because the rate of photoinduced electron transfer should be proportional to the amount of electron transfer, the tunneling decay constant β was estimated to be 0.63 Å −1 in the alternate layer samples, indicating that electrons transfer from titanium oxide to tungsten oxide by throughspace tunneling.
Visible-light-induced electron transfer from a tungstate to a titanate layer was demonstrated to be mediated by excited rhodamine B (RhB) intercalated by ion exchange between the two layers. The distance of only 1 nm between the layers provides a large contact area that enables the efficient mediation of electron transfer by RhB.
Schichtartige Titan‐ und Wolframoxide, die mit Alken‐ bzw. Thiolgruppen modifiziert sind, exfolieren in organischen Lösungsmitteln unter Bildung von Nanoschichten, die dann über eine Klick‐Reaktion abwechselnd stapeln (siehe Bild). Das Material verstärkt die photokatalytische Zersetzung von Methylenblau.
An alternating multilayer of titanium and tungsten oxides is synthesized by modifying layered titanium oxide with an alkene group and layered tungsten oxide with a thiol group, and causing a thiol—ene (click) reaction.
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