Fig. 2: Synthesis and characterization of the photocatalysts.
From: Insight into selectivity of photocatalytic methane oxidation to formaldehyde on tungsten trioxide
a Scheme of preparation process of WO3{001} and WO3{110}. b TEM images of WO3{001} and (c) WO3{110}. The insert is single WO3{110} nanowire with the scale bar as 10 nm. d HRTEM images of WO3{001} and (e) WO3{110} with the inset FFT images. f High-resolution O1s XPS spectra of WO3{001} and (g) WO3{110} after 300 oC calcination.
