File Name : figure s1.tif Caption : schematic diagram of the cvd system used for h-bn films growth. File Name : figure s2.tif Caption : sem image (a) and xrd spectrum (b) of the thin h-bn film grown on quartz. File Name : figure s3.tif Caption : (a) low-magnification tem image of a continuous h-bn film. (b) electron diffraction pattern of the h-bn thin film taken from a freely suspended region. (c) a typical hrtem image obtained from (a). (d) the enlarge hrtem image. corresponding fft image is shown in the inset. (e) the fft filtered hrtem image of the h-bn film. (f) hrtem image of the cross-section of h-bn film. the inset is enlarged hrtem image of the cross-section of h-bn film after fourier filtering. File Name : figure s4.tif Caption : (a) the photo of uniform h-bn multilayers grown on quartz substrate. (b) raman spectra of h-bn at different positions as indicated in (a). (c-e) the sem image of h-bn at different positions as indicated in (a). (f) low magnification image showing a continuous h-bn film on tem grids. scale bar is 1 µm. (g-l) the saed pattern of the h-bn film at different positions as indicated in (f). File Name : figure s5.tif Caption : (a) the sem image of the thicker h-bn films prepared with 0.5 mg/ml rgo concentration of on quartz. (b-d) low-magnification and atomic-resolution tem image of the cross-section of h-bn films on the tem micro grid. the inset in (d) shows a zoom-in view of lattice fringes with a spacing of 0.334 nm. File Name : figure s6.tif Caption : the image of the cross-section of h-bn film on a quartz substrate (a) and the corresponding eds mapping of elements (b-f). File Name : figure s7.tif Caption : (a) hrtem images of the cross-section of h-bn film grown on sio2/si substrate. the fast fourier transform (fft) pattern is displayed in the inset. (b) eels spectrum of the sample. File Name : figure s8.tif Caption : water contact angle of multilayer h-bn grown on quartz substrate (a) and sio2/si substrate (b). File Name : figure s9.tif Caption : b 1s and n 1s core levels of the h-bn film. File Name : figure s10.tif Caption : schematic diagram of the reaction mechanism of h-bn films.