CAJ | 학술논문

采用垂直沉积法组装了平均球径为188 nm的三维有序二氧化硅微球阵列.以该阵列为模板,通过在TiO2前驱体溶胶中多次浸渍热处理循环,随后采用超声辅助的NaOH溶液腐蚀去除硅球模板,制备了＞20层厚的反转结构的二氧化钛多孔膜.该二氧化钛薄膜在550 ℃下热处理20 h其多孔结构保持不变,表明采用此方法制备的二氧化钛多孔膜具有较好的热稳定性.X射线衍射图表明550 ℃下热处理得到的是具有锐钛矿结构的二氧化钛多孔膜.透光光谱显示了光子带隙出现在～400 nm.通过SEM观察,二氧化钛多孔膜的平均孔径为180 nm(±3),收缩率约为4.3%,与布拉格衍射方程计算的结果176 nm有较好的吻合.
채용수직침적법조장료평균구경위188 nm적삼유유서이양화규미구진렬.이해진렬위모판,통과재TiO2전구체용효중다차침지열처리순배,수후채용초성보조적NaOH용액부식거제규구모판,제비료＞20층후적반전결구적이양화태다공막.해이양화태박막재550 ℃하열처리20 h기다공결구보지불변,표명채용차방법제비적이양화태다공막구유교호적열은정성.X사선연사도표명550 ℃하열처리득도적시구유예태광결구적이양화태다공막.투광광보현시료광자대극출현재～400 nm.통과SEM관찰,이양화태다공막적평균공경위180 nm(±3),수축솔약위4.3%,여포랍격연사방정계산적결과176 nm유교호적문합.
Three-dimensionally ordered porous TiO2 films were prepared by sol-dipping method using silica spheres multilayer templates. The templates were previously assembled on glass substrates by vertical deposition method from purified silica spheres alcosol. Ultrasonic-assisted NaOH etching was employed in the removal of silica spheres templates. The inverted TiO2 film was heat-treated at 550 ℃ for 20 h and the porous structure remained unchanged implying a good thermal stability. X-ray diffraction (XRD) results indicate that the inverted TiO2 film is with anatase structure. ESEM images show that the average center-to-center distance between pores of the TiO2 film is 180 nm (±3), about 4.3% smaller than that of the original silica sphere, which is consistent with the value of 176 nm calculated according to the Bragg law. The transmission spectrum shows an attenuation band around wavelength of 400 nm.