物理化学学报2017，Vol.33Issue(12)：2523-2531,9.DOI:10.3866/PKU.WHXB201706091
介孔TiO2薄膜光波导共振传感器对苯并(a)芘的探测灵敏度
Detection Sensitivity to Benzo[a]pyrene of Nanoporous TiO2 Thin-Film Waveguide Resonance Sensor
摘要
Abstract
Nanoporous TiO2 (NPT) films with a thickness of about 295 nm were prepared through the sol-gel copolymer-templating approach on a 40-nm-thick gold film sputtered on a glass substrate for optical waveguide resonance (OWR) sensing. Using the prism-coupled Kretschmann configuration, a single resonance dip was observed in the wavelength range from visible to near infrared, which was attributed to the second order transverse magnetic mode of the OWR chip based on the phase-match condition. By using a combination of Fresnel theory and Bruggeman equation to fit the measured resonance dip, the porosity of NPT films was determined to be about 0.4. After hydrophobilization of the NPT films, the OWR chips were used for bothin-situ andex-situ detections of benzo[a]pyrene (BaP) in water. The experimental results indicate that theex-situ detection sensitivity to BaP is 2 times higher than thein-situ detection sensitivity. The lowest concentration of BaP detectable with the hydrophobilized OWR chip is ca. 100 nmol·L?1. The experimental comparisons reveal that both the nanoporous structure and hydrophobilization of the OWR chip enable to enhance the sensor's sensitivity to BaP. The work demonstrated that the NPT thin-film OWR sensing chips are stable and robust with good reusability.关键词
苯并(a)芘/光波导共振传感器/介孔TiO2薄膜/疏水处理/增敏Key words
Benzo(a)pyrene/Optical waveguide resonance sensor/Nanoporous TiO2 thin films/Hydrophobilization/Sensitivity enhancement分类
化学化工引用本文复制引用
万秀美,王丽,龚晓庆,逯丹凤,祁志美..介孔TiO2薄膜光波导共振传感器对苯并(a)芘的探测灵敏度[J].物理化学学报,2017,33(12):2523-2531,9.基金项目
The project was supported by the National Key Basic Research Program of China (973) (2015CB352100), National Natural Science Foundation of China(61377064, 61675203) and Research Equipment Development Project of Chinese Academy of Sciences (YZ201508).国家重点基础研究发展规划项目(973) (2015CB352100), 国家自然科学基金(61377064, 61675203)及中科院科研装备研制项目(YZ201508)资助 （973）
