Self-assembled hybrid films of phosphotungstic acid and aminoalkoxysilanes on SiO2/Si surfaces

► Formation of phosphotungstate-aminosilylated surfaces. ► Dependence of the surface roughness on the aminosilane structure. ► Phosphotungstic acid chelation by N-(3-(trimethoxysilyl)-propyl)-ethylenediamine. ► Ultrasonic promotion of clustering of phosphotungstic acid.