SnO_2 Nanosheet-assembled Graded Continuous Film

摘要

SnO_2 nanosheet-assembled graded continuous films were successfully fabricated in aqueous solutions containing SnF_2 of 250 mM at 90℃. Thickness reached 1200 nm after immersion for 24 h. The nanosheets were 100-500 nm in in-plane sheet size and 5-20 nm in thickness. The graded structures were caused by gradual change in supersaturation degree of the solutions. The films had a-axis orientation, antireflective effect, band gap of 3.63 eV, and superhydrophilic surfaces. In contrast, the films immersed for 20 m showed band gap of 4.04 eV and contact angle of 58°.