TY - JOUR

T1 - Temperature and Composition Dependent Optical Properties of CdSe/CdS Dot/Rod‐Based Aerogel Networks

AU - Rusch, Pascal

AU - Pluta, Denis

AU - Lübkemann, Franziska

AU - Dorfs, Dirk

AU - Zámbó, Dániel

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). D. D. and N. C. B. would like to thank the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) for funding under Germany's excellence strategy within the cluster of excellence PhoenixD (EXC 2122, project ID 390833453). D. P. is thankful for support from the Hannover School for Nanotechnology (HSN). The authors thank the Laboratory of Nano and Quantum Engineering (LNQE) for providing the TEM facility. Open Access funding enabled and organized by Projekt DEAL.

PY - 2022/1/19

Y1 - 2022/1/19

N2 - Employing nanocrystals (NCs) as building blocks of porous aerogel network structures allows the conversion of NC materials into macroscopic solid structures while conserving their unique nanoscopic properties. Understanding the interplay of the network formation and its influence on these properties like size-dependent emission is a key to apply techniques for the fabrication of novel nanocrystal aerogels. In this work, CdSe/CdS dot/rod NCs possessing two different CdSe core sizes were synthesized and converted into porous aerogel network structures. Temperature-dependent steady-state and time-resolved photoluminescence measurements were performed to expand the understanding of the optical and electronic properties of these network structures generated from these two different building blocks and correlate their optical with the structural properties. These investigations reveal the influence of network formation and aerogel production on the network-forming nanocrystals. Based on the two investigated NC building blocks and their aerogel networks, mixed network structures with various ratios of the two building blocks were produced and likewise optically characterized. Since the different building blocks show diverse optical response, this technique presents a straightforward way to color-tune the resulting networks simply by choosing the building block ratio in connection with their quantum yield.

AB - Employing nanocrystals (NCs) as building blocks of porous aerogel network structures allows the conversion of NC materials into macroscopic solid structures while conserving their unique nanoscopic properties. Understanding the interplay of the network formation and its influence on these properties like size-dependent emission is a key to apply techniques for the fabrication of novel nanocrystal aerogels. In this work, CdSe/CdS dot/rod NCs possessing two different CdSe core sizes were synthesized and converted into porous aerogel network structures. Temperature-dependent steady-state and time-resolved photoluminescence measurements were performed to expand the understanding of the optical and electronic properties of these network structures generated from these two different building blocks and correlate their optical with the structural properties. These investigations reveal the influence of network formation and aerogel production on the network-forming nanocrystals. Based on the two investigated NC building blocks and their aerogel networks, mixed network structures with various ratios of the two building blocks were produced and likewise optically characterized. Since the different building blocks show diverse optical response, this technique presents a straightforward way to color-tune the resulting networks simply by choosing the building block ratio in connection with their quantum yield.

KW - CdSe/CdS dot/rod

KW - aerogels

KW - low temperature spectroscopy

KW - optical characterization

KW - semiconductor nanocrystals

UR - http://www.scopus.com/inward/record.url?scp=85119694987&partnerID=8YFLogxK

U2 - 10.1002/cphc.202100755

DO - 10.1002/cphc.202100755

M3 - Article

VL - 23

JO - CHEMPHYSCHEM

JF - CHEMPHYSCHEM

SN - 1439-4235

IS - 2

M1 - e202100755

ER -