KOPS - The Institutional Repository of the University of Konstanz

Light-Triggered Boost of Activity of Catalytic Bola-Type Surfactants by a Plasmonic Metal-Support Interaction Effect

Light-Triggered Boost of Activity of Catalytic Bola-Type Surfactants by a Plasmonic Metal-Support Interaction Effect

Cite This

Files in this item

Files Size Format View

There are no files associated with this item.

SUTTER, Sebastian, Bastian TREPKA, Stephan SIROKY, Kay HAGEDORN, Sebastian THEISS, Peter BAUM, Sebastian POLARZ, 2019. Light-Triggered Boost of Activity of Catalytic Bola-Type Surfactants by a Plasmonic Metal-Support Interaction Effect. In: ACS Applied Materials & Interfaces. 11(17), pp. 15936-15944. ISSN 1944-8244. eISSN 1944-8252. Available under: doi: 10.1021/acsami.9b03727

@article{Sutter2019-05-01Light-45817, title={Light-Triggered Boost of Activity of Catalytic Bola-Type Surfactants by a Plasmonic Metal-Support Interaction Effect}, year={2019}, doi={10.1021/acsami.9b03727}, number={17}, volume={11}, issn={1944-8244}, journal={ACS Applied Materials & Interfaces}, pages={15936--15944}, author={Sutter, Sebastian and Trepka, Bastian and Siroky, Stephan and Hagedorn, Kay and Theiß, Sebastian and Baum, Peter and Polarz, Sebastian} }

Siroky, Stephan Polarz, Sebastian Polarz, Sebastian Hagedorn, Kay eng 2019-05-14T16:21:22Z Trepka, Bastian Trepka, Bastian 2019-05-14T16:21:22Z 2019-05-01 Sutter, Sebastian Sutter, Sebastian Siroky, Stephan Theiß, Sebastian Baum, Peter Baum, Peter Theiß, Sebastian Hagedorn, Kay Light-Triggered Boost of Activity of Catalytic Bola-Type Surfactants by a Plasmonic Metal-Support Interaction Effect The maximization of activity is a general aim in catalysis research. The possibility for light-triggered enhancement of a catalytic process, even if the process is not photochemical in nature, represents an intriguing concept. Here, we present a novel system for the exploration of the latter idea. A surfactant with a catalytically active head group, a protonated polyoxometalate (POM) cluster, is attached to the surface of a gold nanoparticle (Au NP) using thiol coupling chemistry. The distance of the catalytically active center to the gold surface could be adjusted precisely using surfactants containing hydrocarbon chains (C<sub>n</sub>) of different lengths ( n = 4-10). Radiation with VIS-light has no effect on the catalytic activity of micellar aggregates of the surfactant. The situation changes, as soon as the surfactants have been attached to the Au NPs. The catalytic activity could almost be doubled. It was proven that the effect is caused by coupling the surface plasmon resonance of the Au NPs with the properties of the POM head group. The improvement of activity could only be observed if the excitation wavelength matches the absorption band of the used Au NPs. Furthermore, the shorter the distance between the POM group and the surface of the NP, the stronger is the effect. This phenomenon was explained by lowering the activation energy of the transition state relevant to the catalytic process by the strong electric fields in the vicinity of the surfaces of plasmonic nanoparticles. Because the catalytic enhancement is wavelength-selective, one can imagine the creation of complex systems in the future, a system of differently sized NPs, each responsible for a different catalytic step and activated by light of different colors.

This item appears in the following Collection(s)

Search KOPS


Browse

My Account