ORCID Profile
0000-0002-0035-2490
Current Organisation
University of Rostock
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Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1MA00678A
Abstract: Oxidation states of MoO 3 alter the electronic properties by several orders of magnitude. Oxygen vacancy-mediated intrinsic defects in vertically aligned α-MoO 3 crystals are systematically tuned and their impact on optoelectronic properties analyzed.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA01281E
Abstract: We report a procedure for large scale, reproducible and fast synthesis of polycrystalline, dense, vertically aligned α-MoO 3 nanostructures on conducting (FTO) and non-conducting substrates (Si/SiO 2 ) by using a simple, low-cost hydrothermal technique.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0NR06993K
Abstract: Pairing ZnSe/CdS and CdS/ZnSe core/shell quantum dots with NiO thin film photocathodes enhances the photoelectrochemical water reduction.
Publisher: American Chemical Society (ACS)
Date: 25-01-2022
Publisher: American Chemical Society (ACS)
Date: 27-01-2022
Publisher: American Chemical Society (ACS)
Date: 31-01-2020
Abstract: Atomically defined, zero-dimensional magic-size clusters play pivotal roles in the nucleation and growth of semiconductor nanocrystals. Thus, they provide new opportunities to understand and to control nucleation and growth reactions beyond classical nucleation theory and to employ these reactions in the colloidal synthesis of increasingly complex and anisotropic nanomaterials with atomic level monodispersity. Both challenges require reliable determination of the exact structure and size of these ultrasmall and metastable nanoclusters. In this Perspective, we review and discuss the current challenges in analytics of magic-size clusters, in elucidating their formation mechanism, and in using them as next-generation reagents in colloidal chemistry.
Publisher: American Chemical Society (ACS)
Date: 26-03-2018
Abstract: Many potential applications of quantum dots (QDs) can only be realized once the luminescence from single nanocrystals (NCs) is understood. These applications include the development of quantum logic devices, single-photon sources, long-life LEDs, and single-molecule biolabels. At the single-nanocrystal level, random fluctuations in the QD photoluminescence occur, a phenomenon termed blinking. There are two competing models to explain this blinking: Auger recombination and surface trap induced recombination. Here we use lifetime scaling on core-shell chalcogenide NCs to demonstrate that both types of blinking occur in the same QDs. We prove that Auger-blinking can yield single-exponential on/off times in contrast to earlier work. The surface passivation strategy determines which blinking mechanism dominates. This study summarizes earlier studies on blinking mechanisms and provides some clues that stable single QDs can be engineered for optoelectronic applications.
Publisher: American Chemical Society (ACS)
Date: 14-07-2022
Publisher: American Chemical Society (ACS)
Date: 10-12-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC02058B
Abstract: Semiconductor nanorods nucleate via a fibrillar intermediate that is able to template its own preferential growth direction.
Publisher: American Chemical Society (ACS)
Date: 21-01-2020
DOI: 10.1021/ACS.NANOLETT.9B04143
Abstract: Core/shell nanocrystals with a graded interface between core and shell exhibit improved optoelectronic properties compared with particles with an abrupt, sharp interface. Material gradients mitigate interfacial defects and define the shape of the confinement potential. So far, few works exist that allow to quantify the width of the gradient. In this study, ZnSe/CdS nanocrystals with graded shells made at different temperatures are characterized using extended X-ray absorption fine structure (EXAFS) and Raman spectroscopies. The average coordination number of the probed element with respect to the two possible counterions is fit to a simple, geometric model. It is shown that at the lower temperature limit for shell growth (260 °C), substantial interfacial alloying can be attributed mainly to cation migration. At higher temperature (290 °C), strain minimization leads to atomic ordering of the metal ions and an anomalously low degree of phase mixing.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR06635C
Abstract: Small amounts of protic additives determine the structure of the reaction intermediate in nanocrystal synthesis and thus the reaction mechanism and outcome.
Publisher: American Chemical Society (ACS)
Date: 27-06-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR07973K
Abstract: Charge separation at a semiconductor nano-heterointerface is switched between an on and an off state based on a combination of lattice strain, coulomb interaction, and interface trap states.
No related grants have been discovered for Klaus Boldt.