【作者】 于洪涛； 赵慧敏； 全燮； 陈硕；

【Author】 YU Hong-tao ZHAO Hui-min QUAN Xie CHEN Shuo (Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China)

【机构】 大连理工大学环境与生命学院工业生态与环境工程教育部重点实验室；

【摘要】 采用水热刻蚀法在硅片上制备了硅纳米线（SiNW）阵列,然后用化学气相沉积法在SiNW上包覆TiO₂;并且在Si片上直接沉积了TiO₂作为对比。用扫描电镜观察了SiNW和SiNW-TiO₂的形貌。X射线衍射（XRD）表明,TiO₂为锐铁矿相,沿（101）和（200）晶面优势生长。在0.01mol/L Na₂SO₄溶液中测量了SiNW-TiO₂和Si-TiO₂的光电流,在紫外光照射下,SiNW-TiO₂的光电流是Si-TiO₂的2倍以上。以苯酚为目标物测试SiNW-TiO₂复合催化剂的光催化性能,在光强2.0mW,偏压1.0V条件下,25ml初始浓度为5mg/L的苯酚被1cm²的SiNW-TiO₂在120min内完全降解;同样条件下,使用Si-TiO₂时苯酚的降解率是81.4%。更多还原

【Abstract】 The silicon nanowire （SiNW） arrays on silicon wafer have been prepared by a hydrothermal etching method,and then TiO₂ nanoparticals were deposited on the surfaces of the SiNW by a chemical vapor deposition method.In order to compare to the SiNW-TiO₂ composite photocatalysts,TiO₂ were deposited on Silicon wa- fers.Their morphologies were characterized by environmental scanning electron microscopy （ESEM）.TiO₂ was anatase with preferential orientation （101） and （200） planes by X-ray diffractometer （XRD）.The photocurrent density of SiNW-TiO₂ was above double times of Si-TiO₂ in in 0.01 mol/L Na₂SO₄ solution with UV light of 2.0 mW/cm².In the photocatalytic experiments,Under UV light irradiation and a 1.0 V bias potential,the phenol （25 ml,initialize concentration is 5 mg/L） was completely degraded with SiNW-TiO₂ in 120 min,where- as the degradation efficiency of phenol was 81.4% with Si-TiO₂ under the same conditions.更多还原