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Wyświetlanie 1-10 z 85
Tytuł:
Understanding photocatalytic processes in carbon dots with nitrogen and sulfur heteroatoms : energy or electron transfer?
Autorzy:
Krok-Janiszewska, Dominika
Macyk, Wojciech
Ortyl, Joanna
Spilarewicz, Kaja
Kobielusz, Marcin
Pacia, Michał
Thongpan, Winai
Yaemsunthorn, Kasidid
Sysło, Agnieszka
Kasprzyk, Wiktor
Opis:
This study explores the impact of surface chemistry and heteroatom doping on the photocatalytic activity of carbon dot (CD), with a focus on their roles in energy and electron transfer mechanisms for reactive oxygen species generation. A series of N- and S-doped CDs were synthesized and thoroughly purified. Photocatalytic singlet oxygen production was detected via endoperoxide formation, while hydroxyl radicals were monitored through peroxide-assisted hydroxylation of terephthalic acid. The findings reveal that specific CDs primarily govern either energy or electron transfer mechanisms. Fluorescence lifetime analysis suggested that long-lived photon emission generally correlates with increased singlet oxygen production, though the effects vary depending on the type of nitrogen and sulfur doping. This also resulted in an alteration from energy transfer to electron transfer processes. Doping also influences the shift from energy to electron transfer pathways. Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analysis suggested that the partial crystallinity and the presence and arrangement of surface oxygen-containing groups, such as Sdouble bondO, –OH, and –COOH, may drive this transition between the two mechanisms.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Two-electron reduction of quinones by Enterobacter cloacae PB2 pentaerythritol tetranitrate reductase: quantitative structure-activity relationships
Autorzy:
Misevičienė, Lina
Anusevičius, Žilvinas
Šarlauskas, Jonas
Harris, Richard
Scrutton, Nigel
Čėnas, Narimantas
Tematy:
pentaerythritol tetranitrate reductase
reduction mechanism
electron-transfer
quinones
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Wydawca:
Polskie Towarzystwo Biochemiczne
Powiązania:
https://bibliotekanauki.pl/articles/1041091.pdf  Link otwiera się w nowym oknie
Opis:
In order to clarify the poorly understood mechanisms of two-electron reduction of quinones by flavoenzymes, we examined the quinone reductase reactions of a member of a structurally distinct old yellow enzyme family, Enterobacter cloacae PB2 pentaerythritol tetranitrate reductase (PETNR). PETNR catalyzes two-electron reduction of quinones according to a 'ping-pong' scheme. A multiparameter analysis shows that the reactivity of quinones increases with an increase in their single-electron reduction potential and pKa of their semiquinones (a three-step (e-,H+,e-) hydride transfer scheme), or with an increase in their hydride-transfer potential (E7(H-)) (a single-step (H-) hydride transfer scheme), and decreases with a decrease in their van der Waals volume. However, the pH-dependence of PETNR reactivity is more consistent with a single-step hydride transfer. A comparison of X-ray data of PETNR, mammalian NAD(P)H : quinone oxidoreductase (NQO1), and Enterobacter cloacae nitroreductase, which reduce quinones in a two-electron way, and their reactivity revealed that PETNR is much less reactive, and much less sensitive to the quinone substrate steric effects than NQO1. This may be attributed to the lack of π-π stacking between quinone and the displaced aromatic amino acid in the active center, e.g., with Phe-178' in NQO1.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-electron transport characteristics in quantum dot arrays due to ionized dopants
Autorzy:
Moraru, D.
Ligowski, M.
Tarido, J. C.
Miki, S.
Nakamura, R.
Yokoi, K.
Mizuno, T.
Tabe, M.
Tematy:
single dopant
silicon nanowire
single-electron transport
single-electron transfer
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Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:
https://bibliotekanauki.pl/articles/384277.pdf  Link otwiera się w nowym oknie
Opis:
Single charge manipulation for useful electronic functionalities has become an exciting and fast-paced direction of research in recent years. In structures with dimensions below about 100 nm, the physics governing the device operation turn out to be strikingly different than in the case of larger devices. The presence of even a single charge may completely suppress current flow due to the basic electronelectron repulsion (so called Coulomb blockade effect) [1]. It is even more exciting to control this effect at the level of single-electron/single-atom interaction. The atomic entity can be one donor present in silicon lattice with a Coulombic potential well. In principle, it can accommodate basically a single electron. We study the electrical behavior of nanoscale-channel silicon-on-insulator field-effect transistors (SOI-FETs) that contain a discrete arrangement of donors. The donors can be utilized as "stepping stones" for the transfer of single charges. This ability opens the doors to a rich world of applications based on the simple interplay of single charges and single atoms, while still utilizing mostly conventional and well established fabrication techniques. In this work, we distinguish the effects of single-electron transport mediated by one or few dopants only. Furthermore, we show how the single-electron/single-donor interaction can be tuned by using the external biases. We demonstrate then by simulation and experiment the feasibility of single-electron/bit transfer operation (single-electron turnstile).
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 85

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