Facile and Quick Preparation of Colloid Crystals with Micron-sized Particles by Intentionally Induced Convex Flow

BiVO4-Dotted WO3 Photoanode with an Inverse Opal Underlayer for Photoelectrochemical Water Splitting

“…At first, the opal substrate was prepared by using polybead polystyrene (PS) microspheres (200 nm, 2.5% solids-latex, POL). The PS colloidal solution (150 μL) was dropped onto the 1.8 cm × 1.8 cm sized fluorine-doped tin oxide (FTO) substrate (7 Ω·sq, AXEL) and dried by heat (80 °C) until a colloid crystal structure was formed Preparation of WO 3 precursor solutions (step 2 in Figure ) …”

“…The PS colloidal solution (150 μL) was dropped onto the 1.8 cm × 1.8 cm sized fluorine-doped tin oxide (FTO) substrate (7 Ω•sq, AXEL) and dried by heat (80 °C) until a colloid crystal structure was formed. 28 (ii) Preparation of WO 3 precursor solutions (step 2 in Figure 2) To synthesize the precursor solution of WO 3 , ammonium metatungstate hydrate (0.05 g, 99.9%, Wako) was dissolved in 20 μL of H 2 O. This solution was diluted in 80 μL of ethanol and 20 μL of H 2 O.…”