β-Bi₂O₃ films were prepared by sol-gel method process from solutions with different precursor concentration (M = 0.05–0.20). The films were characterized by X-rays diffractions (XRD), field emission electron microscopy (FESEM), atomic force microscopy (AFM), UV–vis spectroscopy, photoluminescence spectroscopy (PL), photoelectrochemical (PEC) and electrochemical impedance measurements. The Bi₂O₃ deposited film had single phase β-Bi₂O₃ on ITO substrate while it exhibited mixed phases of ε-, δ- and β-Bi₂O₃ on glass substrate. By increasing M above 0.05, more XRD patterns were observed and lattice parameter c increased. Besides, crystallite size of films increased first from 19.2 to 26.4 nm at M = 0.05 – 0.15 and then decreased to 19.4 nm at M = 0.20. From AFM, the films consisted of polyhedron-like shape islands with height and distribution increased with increment of M. The surface roughness increased from 10.3 to 18.5 nm for film with M = 0.05 and 0.15, respectively, and then decreased to 14.8 nm for film M = 0.20. Optical band gap decreased from 3.24 eV for film M = 0.05 to 2.89 eV for film M = 0.20. From PEC, photocurrent of films increased with increment of M and had maximum value 3.8 × 10⁻⁴ A/cm² for film M = 0.20 at 0 V versus Ag/AgCl. Electrochemical impedance analysis showed a gradual reduction of charge transfer resistance with increasing M. Finally, β-Bi₂O₃ films with tailored microstructure were prepared which make it attractive for many applications.

β-Bi系_2个ö ₃薄膜通过溶胶-凝胶法处理来自具有不同前体的浓度（溶液制备中号= 0.05-0.20）。薄膜的特征在于X射线衍射（XRD），场发射电子显微镜（FESEM），原子力显微镜（AFM），紫外可见光谱，光致发光光谱（PL），光电化学（PEC）和电化学阻抗测量。铋₂ ö ₃淀积膜具有单相β-Bi系₂ ö ₃ ITO基板上，同时它表现出ε-，δ-和β-Bi系的混合相₂ ö ₃的玻璃基板上。通过增加M高于0.05，观察到更多的XRD图并且晶格参数c增加。此外，薄膜的微晶尺寸首先在M = 0.05 – 0.15时从19.2 nm增加到26.4 nm，然后在M = 0.20时减小到19.4 nm 。根据原子力显微镜，薄膜由多面体形状的岛组成，高度和分布随着M的增加而增加。对于M＝ 0.05和0.15的膜，表面粗糙度分别从10.3nm增加到18.5nm ，然后对于M＝ 0.20的膜，表面粗糙度减小到14.8nm 。光学带隙从膜M = 0.05的3.24 eV降低到膜M = 0.20的2.89 eV 。从PEC看，薄膜的光电流随着中号和具有最大值3.8×10 ^-4 A /厘米²为膜中号= 0.20在0V与银/氯化银。电化学阻抗分析表明，随着M的增加，电荷转移电阻逐渐减小。最后，β-碧_2层Ø ₃制备薄膜量身定制的微结构，这使得它对于许多应用有吸引力。