@article{PilarYesteCarlosHernandezGarridoKumkeetal.2022,
  author    = {Pilar Yeste, Maria and Carlos Hernandez-Garrido, Juan and Kumke, Michael Uwe and Alvarado, Sarah and Cauqui, Miguel Angel and Juan Calvino, Jose and Primus, Philipp-Alexander},
  title     = {Low-temperature growth of reactive pyrochlore nanostructures on Zirconia-supported ceria},
  series = {ACS applied nano materials},
  volume    = {5},
  journal   = {ACS applied nano materials},
  number    = {5},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {2574-0970},
  doi       = {10.1021/acsanm.2c00416},
  pages     = {6316 -- 6326},
  year      = {2022},
  abstract  = {The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development, particularly with regard to an increased focus on the use of renewable biogas and an emerging hydrogen economy. In this study, zirconia-supported ceria catalysts were synthesized, activated by using different thermochemical treatments, and characterized by way of temperature-programmed reduction (TPR), oxygen storage capacity, Xray diffraction, electron microscopy, and luminescence spectroscopy using Eu3+ as a spectroscopic probe. Through reduction-oxidation pretreatment routines, reactive pyrochlore structures were created at temperatures as low as 600 degrees C and identified through TPR and electron microscopy experiments. A structural relationship and alignment of the crystal planes is revealed in high-resolution scanning transmission electron microscopy experiments through the digital diffraction patterns. Low-temperature pretreatment induces the formation of reactive pyrochlore domains under retention of the surface area of the catalyst system, and no further morphological changes are detected. Furthermore, the formation of pyrochlore domains achieved through severe reduction and mild reoxidation (SRMO) treatments is reversible. Over multiple alternating SRMO and severe reduction and severe reoxidation (SRSO) treatments, europium spectroscopy and TPR results indicate that pyrochlore structures are recreated over consecutive treatments, whenever the mild oxidation step at 500 degrees C is the last treatment (SRMO, SRMO-SRSO-SRMO, etc.).},
  language  = {en}
}
@article{MunzkeBoehmReich2015,
  author    = {Munzke, Dorit and B{\"o}hm, Michael and Reich, Oliver},
  title     = {Gaseous Oxygen Detection Using Hollow-Core Fiber-Based Linear Cavity Ring-Down Spectroscopy},
  series = {Journal of lightwave technology},
  volume    = {33},
  journal   = {Journal of lightwave technology},
  number    = {12},
  publisher = {Inst. of Electr. and Electronics Engineers},
  address   = {Piscataway},
  issn      = {0733-8724},
  doi       = {10.1109/JLT.2015.2397177},
  pages     = {2524 -- 2529},
  year      = {2015},
  abstract  = {We demonstrate a method for the calibration-free and quantitative analysis of small volumes of gaseous samples. A 10 m hollow-core photonic bandgap fiber is used as the sample cell (volume = 0.44 mu L) and is placed inside a linear resonator setup. The application of cavity ring-down spectroscopy and in consideration of rather small coupling losses, this leads to an increased effective optical path length of up to 70 m. This implies a volume per optical interaction path length of 6.3 nL.m(-1). We used tunable diode laser spectroscopy at 760 nm and scanned the absorption for oxygen sensing. The optical loss due to sample absorption is obtained by measuring the ring-down time of light propagating inside the cavity. The resultant absorption coefficient shows a discrepancy of only 5.1\% comparing to the HITRAN database. This approach is applicable for sensitive measurements if only submicroliter sample volumes are available.},
  language  = {en}
}