BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT SUMMARY:Measuring Layer Dependent Properties of 2-Dimensional Semiconductor s LOCATION:Chemistry A101 TZID:America/Denver DTSTART:20210929T160000 UID:2026-04-28-15-12-45@natsci.colostate.edu DTSTAMP:20260428T151245 Description:Literature Seminar -\n\nOver the past 20 years\, 2-dimensional (2D) material research exploded after the discovery of a simple and effect ive graphene preparation technique (so-called ‘Scotch tape method’).  Mere van der Waals forces hold together the stacked layers of the atomica lly thin 2D material.  Beyond graphene\, there are other 2D semiconductin g materials with promising new applications for energy conversion\, electr onics\, and catalysis.  Understanding the semiconductor’s “band gap is essential in making use of its electronic properties.  MoS2 is a wel l-studied archetype of 2D semiconducting materials with favorable electron ic\, physical\, and chemical properties.\n\nMoS2 behavior varies significa ntly from the bulk down to monolayer size\; this allows for thickness-depe ndent tunability.  Stacking layers of different 2D materials or introduci ng liquid at the surface also changes its electronic properties.  Combini ng modern techniques\, Du et. al. investigated physical and electronic pro perties of few-layer MoS2.1  The simultaneous in situ measurements with A tomic Force Microscopy (AFM) and Scanning Electrochemical Microscopy (SECM ) map the thickness (i.e. layer number) of MoS2 nanoflakes and provide inf ormation of electron transfer at the surface.  Finally\, the thickness-de pendent band energy levels are proposed at the semiconductor-liquid interf ace.  These studies focus on spatially mapping electronic properties of 2 D semiconductors using electrochemistry and microscopy.\n\n\n\n \;\n\n 1 Du\, H.-Y.\; Huang\, Y.-F.\; Wong\, D.\; Tseng\, M.-F.\; Lee\, Y.-H.\; W ang\, C.-H.\; Lin\, C.-L.\; Hoffmann\, G.\; Chen\, K.-H.\; Chen\, L.-C. Na noscale Redox Mapping at the MoS2-Liquid Interface. Nat Commun 2021\, 12 ( 1)\, 1321. https://doi.org/10.1038/s41467-021-21660-z. 4:00 pm END:VEVENT END:VCALENDAR