Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Pyrene coating transition metal disulfides as protection from photooxidation and environmental aging
Δημιουργός/Συγγραφέας:	Canton-Vitoria, Ruben Sayed-Ahmad-Baraza, Yuman Humbert, Bernard Arenal, Raul Ewels, Christopher P [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Εκδότης:	MDPI
Ημερομηνία:	2020-02-19
Γλώσσα:	Αγγλικά
ISSN:	2079-4991
DOI:	10.3390/nano10020363
Άλλο:	32093023
Περίληψη:	Environmental degradation of transition metal disulfides (TMDs) is a key stumbling block in a range of applications. We show that a simple one-pot non-covalent pyrene coating process protects TMDs from both photoinduced oxidation and environmental aging. Pyrene is immobilized non-covalently on the basal plane of exfoliated MoS2 and WS2. The optical properties of TMD/pyrene are assessed via electronic absorption and fluorescence emission spectroscopy. High-resolution scanning transmission electron microscopy coupled with electron energy loss spectroscopy confirms extensive pyrene surface coverage, with density functional theory calculations suggesting a strongly bound stable parallel-stacked pyrene coverage of ~2-3 layers on the TMD surfaces. Raman spectroscopy of exfoliated TMDs while irradiating at 0.9 mW/4 μm2 under ambient conditions shows new and strong Raman bands due to oxidized states of Mo and W. Yet remarkably, under the same exposure conditions TMD/pyrene remain unperturbed. The current findings demonstrate that pyrene physisorbed on MoS2 and WS2 acts as an environmental barrier, preventing oxidative surface reactions in the TMDs catalyzed by moisture, air, and assisted by laser irradiation. Raman spectroscopy confirms that the hybrid materials stored under ambient conditions for two years remained structurally unaltered, corroborating the beneficial role of pyrene for not only hindering oxidation but also inhibiting aging.
Τίτλος πηγής δημοσίευσης:	Nanomaterials (Basel, Switzerland)
Τόμος/Κεφάλαιο:	10
Τεύχος:	2
Σελίδες:	363
Θεματική Κατηγορία:	[EL] Χημεία (Γενικά)[EN] Chemistry (General)
Λέξεις-Κλειδιά:	2D materials DFT calculations MoS2 WS2 Aging Exfoliation Functionalization Oxidation Protection Pyrene
Κάτοχος πνευματικών δικαιωμάτων:	Copyright © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://www.mdpi.com/2079-4991/10/2/363
Ηλεκτρονική διεύθυνση περιοδικού (link) :	https://www.mdpi.com/journal/nanomaterials
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο