LAUSR

Molybdenum disulfide has promising applications from electronics to catalysis. Facile controlled synthesis of desired MoS2 phase and improving optical and electrical properties of MoS2 are under intensive investigation. The significant enhancement in photocatalytic activity is found in the heteroepitaxial structure of 1T MoS2 and SnO2 constructed using convenient hydrothermal method compared to 1T MoS2. High‐resolution transmission electronic microscopy demonstrates epitaxial growth of 1T MoS2 nanosheets on SnO2 nanoparticle based on an epitaxial relationship of zone axis MoS2[100]//SnO2[ 1¯11¯ ] and MoS2[100]//SnO2[ 11¯1 ] and plane MoS2(011)//SnO2(011) in both cases. Serving as substrate for growth of desired 1T MoS2 phase, smaller grain‐sized SnO2 is in favor of more effective epitaxial growth of 1T MoS2. The epitaxial structure formed between 1T MoS2 and SnO2 of 3–5 nm ensures stable electron transfer and thus a much‐improved photocatalytic activity. Direct evidence of epitaxial construction of desired 1T MoS2 nanosheets on SnO2 nanoparticles is provided, which accounts for the synergetic improvement on photocatalytic activity of MoS2–SnO2 composite photocatalysts.