Citation: WAN Xiu-Mei, WANG Li, GONG Xiao-Qing, LU Dan-Feng, QI Zhi-Mei. Detection Sensitivity to Benzo[a]pyrene of Nanoporous TiO₂ Thin-Film Waveguide Resonance Sensor[J]. Acta Physico-Chimica Sinica, ;2017, 33(12): 2523-2531. doi: 10.3866/PKU.WHXB201706091 shu

Detection Sensitivity to Benzo[a]pyrene of Nanoporous TiO₂ Thin-Film Waveguide Resonance Sensor

WAN Xiu-Mei ^1,2, ,
WANG Li ^1,2 ,
GONG Xiao-Qing ^1,2 ,
LU Dan-Feng ¹ ,
QI Zhi-Mei ¹

1.
State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, P. R. China;
2.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 18 May 2017
Revised Date: 31 May 2017

Fund Project: 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).

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 both in-situ and ex-situ detections of benzo[a]pyrene (BaP) in water. The experimental results indicate that the ex-situ detection sensitivity to BaP is 2 times higher than the in-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.
- Benzo (a) pyrene,
- Optical waveguide resonance sensor,
- Nanoporous TiO₂ thin films,
- Hydrophobilization,
- Sensitivity enhancement
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Detection Sensitivity to Benzo[a]pyrene of Nanoporous TiO2 Thin-Film Waveguide Resonance Sensor

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通讯作者: 陈斌, bchen63@163.com

Detection Sensitivity to Benzo[a]pyrene of Nanoporous TiO₂ Thin-Film Waveguide Resonance Sensor