Multidimensional Morphology Control for PS‐b‐P ₄ VP Templated Mesoporous Iron (III) Oxide Thin Films

Mesoporous α-Fe2O3 thin films with large area homogeneity demonstrate tremendous potential in multiple applications. In the present work, synthesis of morphology-controlled is realized polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) diblock copolymer assisted sol-gel chemistry. The solvent category (DMF and 1,4-dioxane) polymer-to-FeCl3 ratio used for solution preparation are systematically varied to tune morphology films. For both solvents, DMF 1,4-dioxane, nanocluster structures obtained low PS-b-P4VP concentration. When concentration reaches critical micelle concentration, spherical wormlike porous specifically formed 1,4-dioxane system, respectively. Further increasing ratios leads enlargement pore sizes whereas center-to-center distances system decrease. Moreover, DMF/1,4-dioxane mixtures different volume applied sol–gel gain more insight into how selectivity affects film morphology. By adjusting preferential affinity mixture polymer blocks, a shape transition observed Δχ value around 0.77.