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首页> 外文期刊>Journal of Applied Physics >In-situ and ex-situ characterization of TiO_2 and Au nanoparticle incorporated TiO_2 thin films for optical gas sensing at extreme temperatures
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In-situ and ex-situ characterization of TiO_2 and Au nanoparticle incorporated TiO_2 thin films for optical gas sensing at extreme temperatures

机译：TiO_2和Au纳米粒子结合的TiO_2薄膜的原位和异位表征，用于极端温度下的光学气体传感

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摘要

Sensor technologies that can operate under extreme conditions including high temperatures, high pressures, highly reducing and oxidizing environments, and corrosive gases are needed for process monitoring and control in advanced fossil energy applications. Sensor technologies based on optical waveguide-based techniques are highly attractive for passive, embedded, and remote sensing. A critical enabling technology for optical waveguide sensors is the development of advanced optical thin film coatings which have a desired set of optical properties that change in a rapid, selective, and sensitive manner to a particular quantity of interest. TiO_2 and Au nanoparticle incorporated TiO_2 nanocomposite thin films were prepared through sol-gel deposition techniques and their respective optical responses to a 4% H_2/N_2 mixture were investigated in the visible / near-IR range of 400-1000 nm. A tendency for Au nanoparticles to occupy special sites on the TiO_2 microstructure, such as grain boundaries, twin boundaries, and triple points is rationalized in terms of basic surface energy arguments. The Au / TiO_2 nanocomposite films showed a useful optical response due to a reversible, rapid, and repeatable shift in the localized surface plasma resonance peak of Au nanoparticles at a temperature of 650 ℃ and 850 ℃. In contrast, high temperature exposure of TiO_2 films to reducing gases at 850 ℃ resulted in the growth of abnormally large grains or "hillocks" that protruded from the sample surface and resulted in light scattering and an irreversible decrease in transmission at short wavelengths. The origin of the observed optical response of Au / TiO_2 nanocomposite films is discussed in the context of work by prior investigators in the Au / yttria-stabilized Zirconia (YSZ) system and needs for future research in this area is highlighted.
机译：对于先进的化石能源应用中的过程监控，需要能够在包括高温，高压，高度还原和氧化环境以及腐蚀性气体在内的极端条件下运行的传感器技术。基于光波导技术的传感器技术对于无源，嵌入式和遥感非常有吸引力。用于光波导传感器的一项关键使能技术是开发先进的光学薄膜涂层，该涂层具有所需的一组光学特性，这些特性以快速，选择性和灵敏的方式变化为特定的目标量。通过溶胶-凝胶沉积技术制备了掺有TiO_2和Au纳米粒子的TiO_2纳米复合薄膜，并在400-1000 nm的可见/近红外范围内研究了它们各自对4％H_2 / N_2混合物的光学响应。根据基本表面能论证，合理化了Au纳米颗粒占据TiO_2微结构上特殊位置的趋势，例如晶界，孪晶界和三重点。 Au / TiO_2纳米复合薄膜由于在650℃和850℃的温度下，Au纳米粒子的局部表面等离子体共振峰发生可逆，快速和可重复的移动，因此显示出有用的光学响应。相反，在850℃下将TiO_2薄膜暴露于还原性气体中会导致从样品表面突出的异常大的晶粒或“小丘”的生长，并导致光散射和短波长下不可逆的透射率下降。在先前研究者对金/氧化钇稳定的氧化锆（YSZ）系统进行研究的背景下，讨论了Au / TiO_2纳米复合膜的光学响应的​​起源，并强调了该领域未来的研究需求。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.064320.1-064320.11|共11页
  • 作者

    Paul R. Ohodnicki Jr; Congjun Wang; Sittichai Natesakhawat; John P. Baltrus; Thomas D. Brown;

  • 作者单位

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh,Pennsylvania 15236, USA Materials Science and Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA;

    URS Corporation, P.O. Box 618, South Park, Pennsylvania 15219, USA;

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh,Pennsylvania 15236, USA Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA;

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh,Pennsylvania 15236, USA;

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh,Pennsylvania 15236, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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