Patterned Growth\nand Modulated Photoluminescence of\nMoS<sub>2</sub> on the Mixed-Terminated SrTiO<sub>3</sub> Surface

Understanding the intricate interplay between 2D materials\n(2DMs)\nand functional oxides is crucial for advancing various applications\nin nanoscience and nanotechnology. Within this context, we investigate\nthe composite system comprising molybdenum disulfide (MoS<sub>2</sub>) and strontium titanate (SrTiO<sub>3</sub>) substrates, elucidating\nhow controlled variations in a substrate surface structure modulate\nthe growth and properties of MoS<sub>2</sub>. We developed a reliable\nmethod to manipulate the termination of SrTiO<sub>3</sub>(001) single\ncrystals with different contents of TiO<sub>2</sub> and SrO and fabricate\nhigh-quality MoS<sub>2</sub> films selectively on the TiO<sub>2</sub> area while avoiding all the SrO regions through a chemical vapor\ndeposition strategy. Multiple characterization techniques revealed\nthat such patterned MoS<sub>2</sub> possesses not only ideal crystallinity\nbut also a nanoporous structure with a large ratio of boundary sites\nwhich efficiently facilitates the charge transfer between MoS<sub>2</sub> and the SrTiO<sub>3</sub> substrate. Our findings underscore\nthe pivotal role of substrate surface termination in modulating the\nelectronic and optical properties of the composite system, paving\nthe way for the rational design and engineering of 2DM-based devices\nfor diverse applications in nanoelectronics and optoelectronics.