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Data for Stable photoluminescence enhancement in monolayer molybdenum disulfide by superacid treatment Brendan F. M. Healy (20979829) Sophie L. Pain (11896239) Nicholas E. Grant (6877136) John D. Murphy (6877151) Migrated from ePrints Monolayer molybdenum disulfide (1L MoS2) has emerged as a promising material for next-generation optoelectronic technologies, owing to its direct bandgap and resulting photoluminescence (PL) emission in the visible spectral range. Despite its favorable PL character, the emission efficiency from as-grown 1L MoS2 is often poor, with the PL quantum yield (PLQY) reported to be as low as <1%. Treatment with superacid bis(trifluoromethanesulfonyl)amide (TFSA) has been widely reported to enhance the 1L MoS2 PL intensity by up to 2 orders of magnitude, capable of achieving near-unity PLQY (≥95%). However, the long-term stability of the elevated 1L MoS2 PL emission under ambient conditions, which is a critical factor in the performance of practical optoelectronic devices, is not well-understood. In this work, we study the evolution of the PL character of TFSA-treated 1L MoS2 over 120 days of ambient storage. We reveal that the initial TFSA treatment leads to the formation of a nanoscale superacidic layer on the 1L MoS2 surface, yielding an order-of-magnitude increase in PL intensity, coupled with a blueshift and narrowing of the PL emission. We attribute these modifications to a synergistic effect of defect passivation and charge doping. By combining atomic force microscopy with spatially resolved Raman/PL spectroscopy, we demonstrate that the superacid nanolayer morphology and enhanced PL emission are preserved under ambient conditions for at least 120 days. This work establishes the long-term ambient stability of TFSA-enhanced 1L MoS2, highlighting superacid treatment as a viable route for realizing stable atomically thin optoelectronic devices.<br><br>Excel spreadsheet containing data for figures in associated publication, including topographic atomic force microscopy, Raman spectroscopy and photoluminescence spectroscopy 2026-09-17T20:37:54Z Dataset Dataset 10.82444/warw.33911569.v1 https://figshare.com/articles/dataset/Data_for_Stable_photoluminescence_enhancement_in_monolayer_molybdenum_disulfide_by_superacid_treatment/33911569 CC BY 4.0