A facile strategy to colloidal crystals by drying condensed suspension droplets

► Drying condensed suspension droplet above 30 °C produced uniform colloidal crystals. ► Raising drying temperature could reduce the lattice spacing of colloidal crystals. ► Formation of uniform film was due to limited outward diffusion of solvent in drying. ► Uniform film dried at 30 °C was fcc feature but stain got at 25 °C had bcc lattices.