Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Tuning the Nonlinear Optical Properties of MoS2 by Interfacing with Bay- or Imide-Substituted Perylene Diimides
Δημιουργός/Συγγραφέας:	Nikoli, Eleni Canton-Vitoria, Ruben Skentzos, Georgios Pramatioti, Efrosyni Zink-Lorre, Nathalie Gutiérrez-Vílchez, Ana Maria Fernández-Lázaro, Fernando Arenal, Raul Couris, Stelios [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Ημερομηνία:	2026-02-10
Γλώσσα:	Αγγλικά
ISSN:	1944-8244 1944-8252
DOI:	10.1021/acsami.5c25463
Άλλο:	41666282
Περίληψη:	We have investigated the tuning of nonlinear optical (NLO) properties in semiconducting MoS2 nanosheets through covalent functionalization with bay- or imide-substituted perylene diimide (PDI) derivatives. Five MoS2-PDI hybrid nanomaterials 1a-5a were synthesized by attaching PDI variants featuring azobenzene or other substituents, characterized via Raman, IR, TGA, STEM-EDS, ultraviolet-visible (UV-vis), photoluminescence, and electrochemical analyses, and evaluated for NLO response under nanosecond (4 ns, 1064/532 nm) and femtosecond (70 fs, 800/400 nm) laser excitations. The hybrids exhibit enhanced and tunable NLO-absorptive (switching from saturable to reverse-saturable absorption with intensity) and NLO-refractive (self-focusing) responses compared to exfoliated MoS2, with 1a and 2a (azobenzene-substituted PDIs) showing the strongest effects due to efficient electron-transfer and -resonant excitations. Hybrids demonstrate superior NLO susceptibility (χ3) values, particularly under resonant 532 nm excitation, with Im{χ3} values of up to -514.7 ± 57.4 × 10-13 esu·mL/mg for 2a at low intensities, attributed to Pauli blocking, defect states, and two-photon processes. Hybrids having bay-substituted PDIs grafted on MoS2 enhance conjugation and performance over imide variants, enabling applications in optical-limiting, mode-locking, and photonic devices. Threshold intensities for NLA switching (150-250 MW/cm2) exceed those of MoS2, highlighting the stability for high-power uses. The developed hybrid materials advance two-dimensional transition-metal dichalcogenide-based optoelectronics by overcoming light-matter interaction limits through molecular antenna effects from PDIs. The study underscores the substituent position and azobenzene integration as levers for NLO optimization in hybrid nanoarchitectures.
Τίτλος πηγής δημοσίευσης:	ACS applied materials & interfaces
Θεματική Κατηγορία:	[EL] Εφαρμοσμένη οπτική. Φωτονική[EN] Applied optics. Photonics [EL] Νανοτεχνολογία[EN] Nanotechnology [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	functionalization molybdenum disulfide nonlinear optics perylene diimide transition-metal dichalcogenides
Χρηματοδότης:	Hellenic Foundation for Research and Innovation HFRI Ministerio de Ciencia, Innovación y Universidades (MICIU) Agencia Estatal de Investigación (AEI) Generalitat Valenciana European Regional Development Fund (ERDF / EU) European Union European Union–NextGenerationEU Government of Aragon (DGA)
Χρηματοδοτικό πρόγραμμα:	2nd Call for HFRI Research Projects to support Faculty Members and Researchers Advanced Materials program (MCIN) PRTR-C17.I1 ERDF / EU
Αναγνωριστικό χρηματοδοτικού προγράμματος:	2482 PID2022-140315NB-I00 PID2023-151080NB-I00 CEX2023-001286-S 10.13039/501100011033 CIPROM/2021/059 PRTR-C17.I1 MFA/2022/028 E13 23R
Κάτοχος πνευματικών δικαιωμάτων:	© 2026 The Authors. Published by American Chemical Society.
Όροι και προϋποθέσεις δικαιωμάτων:	This publication is licensed under CC-BY-NC-ND 4.0 .
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1021/acsami.5c25463
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο