One‐Step Formation of Hybrid Nanocrystal Gels : Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

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Zámbó, D.; Schlosser, A.; Graf, R.T.; Rusch, P.; Kißling, P.A. et al.: One‐Step Formation of Hybrid Nanocrystal Gels : Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks. In: Advanced optical materials 9 (2021), Nr. 17, 2170067. DOI:

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Hybrid semiconductor-based nanocrystals (NCs) are generally synthesized in organic media prior to their assembly into catalytically promising nanostructures via multistep methods. Here, a tunable, easy-to-adapt and versatile approach for the preparation of hybrid nanoparticle networks from aqueous nanocrystal solutions is demonstrated. The networks consist of interconnected semiconductor NC backbones (made of CdSe/CdS dot-in-rods or core/crown nanoplatelets) decorated with noble metal (Au and Pt) or with metal-based domains (Co2+ and Ni2+) demonstrating a powerful synthetic control over a variety of hybrid nanostructures. The deposition of the domains and the formation of the network take place simultaneously (one-step method) at room temperature in dark conditions without any external trigger. Beside the in-depth structural characterization of the gel-like hybrid networks, the wavelength-dependent optical features are studied to reveal an efficient charge carrier separation in the systems and a controllable extent of fluorescence quenching through the domain sizes. Photoluminescence quantum yields and decay dynamics highlight the importance of fine-tuning the conduction band/Fermi level offset between the semiconductors and the various deposited metals playing central role in the electron–hole separation processes. This procedure provides a novel platform toward the preparation of photo(electro)catalytically promising hybrid nanostructures (acetogels and xerogels) without the need of presynthetic hybrid particle design.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2021-05-29
Appears in Collections:Naturwissenschaftliche Fakultät

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