Modified Hot Plate Method for Synthesizing MoO3 Nanoplates

Molybdenum trioxide(MoO3)with layered structures adopts exotic physical features,which has evoked an extensive in-terest in electronic and pho-toelectronic devices.Here,we report a low-cost,simple-handle,atmospheric-pressure,and rapid-synthesis technique for growing large-scale MoO3 crystals,i.e.,a modified hot plate method.The growth rate and morphology of the MoO3 crystals were well controlled by changing source temperatures and substrates.Complementary measurements,including optical microscope,atomic force microscope,X-ray diffraction,Raman spectroscope,and scanning near-field optical micro-scope,were used to investigate the structural and physical properties.The results reveal that large-scale MoO3 crystals with well-defined crystallinity have been obtained.Mean-while,surface hyperbolic phonon polaritons on as-prepared MoO3 crystal planes have also been observed,which may provide an attractive insight into nanoelectronic and nanophotonic devices.