Brkić, Antun Lovro; Supina, Antonio; Čapeta, Davor; Ptiček, Lucija; Racané, Livio; Šekutor, Marina; Teichert, Christian; Delač, Ida (2025) Laser-induced organic agglomerates on 2D MoS2 during thermal treatment. Nano Express, 6 (3). ISSN 2632-959X
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Abstract
In this study, we investigate the real-time evolution of photoluminescence (PL) in MoS2 samples modified with L63MS molecules during controlled thermal treatment, unveiling a unique laser-induced molecular agglomeration process. By integrating a heater into our microscopy setup, we monitored in situ changes and discovered that between 120 degrees C and 180 degrees C, focused laser irradiation induces the formation of molecular agglomerates with heights ranging from 5 to 20 nm (as confirmed by atomic force microscopy (AFM)). Notably, after subsequent heating to 320 degrees C, while non-agglomerated molecules desorb, these agglomerates remain stable. Raman spectroscopy reveals that the MoS2 lattice beneath the agglomerates experiences minimal phonon mode shifts-demonstrating a protective effect-and PL measurements show a redshift in the exciton A peak due to localized strain and charge transfer effects. In contrast to previous studies on the real-time PL evolution of MoS2, our work uniquely demonstrates that controlled agglomerate formation via laser exposure not only modulates optical properties but also provides a pathway for localized functionalization of MoS2, opening new avenues for optoelectronic device engineering.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | MoS2 monolayer; chemical vapor deposition (CVD); organic molecules; drop-casting; photoluminescence (PL); Raman spectroscopy; atomic force microscopy (AFM) | ||||||||
| Subjects: | NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Condensed Matter Physics |
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| Divisions: | Division of Organic Chemistry and Biochemistry | ||||||||
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| Depositing User: | Kristina Ciglar | ||||||||
| Date Deposited: | 06 Nov 2025 12:20 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/10166 | ||||||||
| DOI: | 10.1088/2632-959X/adf5da |
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