Details
| Original language | English |
|---|---|
| Article number | 2100291 |
| Journal | Advanced Optical Materials |
| Volume | 9 |
| Issue number | 17 |
| Early online date | 29 May 2021 |
| Publication status | Published - 6 Sept 2021 |
Abstract
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.
Keywords
- charge carrier separation, gel networks, hybrid nanostructures, metal domain, semiconductor nanoplatelets, semiconductor nanorods
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Advanced Optical Materials, Vol. 9, No. 17, 2100291, 06.09.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - One-Step Formation of Hybrid Nanocrystal Gels
T2 - Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks
AU - Zámbó, Dániel
AU - Schlosser, Anja
AU - Graf, Rebecca T.
AU - Rusch, Pascal
AU - Kißling, Patrick A.
AU - Feldhoff, Armin
AU - Bigall, Nadja C.
N1 - Funding Information: The project leading to these results was funded by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement 714429). The authors acknowledge the financial support from the German Federal Ministry of Education and Research (BMBF) within the framework of the program NanoMatFutur, support code 03X5525.?In addition, this work was funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) under Germany's excellence strategy within the cluster of excellence PhoenixD (EXC 2122, project ID 390833453) and the grant BI 1708/4-1. A.S. and R.T.G. are thankful for financial support from the Hannover School for Nanotechnology (HSN). The authors moreover thank the Laboratory of Nano and Quantum Engineering (LNQE) for providing the TEM facility. Open Access funding enabled and organized by Projekt DEAL.
PY - 2021/9/6
Y1 - 2021/9/6
N2 - 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.
AB - 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.
KW - charge carrier separation
KW - gel networks
KW - hybrid nanostructures
KW - metal domain
KW - semiconductor nanoplatelets
KW - semiconductor nanorods
UR - http://www.scopus.com/inward/record.url?scp=85106754820&partnerID=8YFLogxK
U2 - 10.1002/adom.202100291
DO - 10.1002/adom.202100291
M3 - Article
AN - SCOPUS:85106754820
VL - 9
JO - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
IS - 17
M1 - 2100291
ER -