Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.091
Publication date: 7th February 2022
Quasi-Type II CdSe@CdS dot-in-rod nanorods (NRs) exhibit high absorption coefficients (~107 M-1 cm-1) in the UV/Vis and efficient charge-separation following photoexcitation, with the photogenerated hole localizing to the CdSe core and the electron delocalized over the entire structure. These properties render them attractive materials as photosensitizers in photocatalytic reactions such as light-driven water splitting, especially when coupled to a reaction centre such as metal nanoparticles.1 On the other hand, some drawbacks of these structures have to be considered when designing a catalytic system. For instance, molecular functionalization of NRs is limited to specific anchoring groups such as thiols and amines.2 Additionally, the catalytic efficiency is limited by slow (> 100 ps) hole removal, whereas the electron transfer steps are usually very fast (<10s of ps). Last, these structures are prone to photo-oxidation, which limits their long-term usage.
Recently, we demonstrated a photocatalytically able system consisting of polydopamine (PDA) coated NRs.3 The PDA-coating tried to counteract the above-mentioned drawbacks of NRs: it served as a scaffold for a molecular catalyst and acted as a charge-mediator between NRs and catalyst, potentially improving long-term stability. However, the underlying charge transfer processes have not been fully resolved yet.
Here, the photoinduced charge transfer processes between NRs and PDA are investigated. First, as a model system, the interaction between water-soluble NRs and molecular dopamine is investigated at different pH values and dopamine concentrations using steady-state and time-resolved absorption and photoluminescence spectroscopies. Insights gained from these quenching experiments serve as a basis for explaining the charge transfer processes in PDA-coated nanorods. Last, implications of these fundamental processes on photocatalysis are considered.
This research was funded by the German Research Foundation (DFG)—project number 364549901—TRR234 (CataLight, B4 and Z2), Inst 275/391-1, and the Fonds der Chemischen Industrie (FCI).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.