From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
This presentation reports our findings in the fabrication and evaluation of nanostructured sapphire optical fiber (NSOF) for surface-enhanced Raman spectroscopy (SERS) sensing at elevated temperatures. Specifically, we systematically investigated the morphological stability and the mechanical properties of the anodized aluminum oxide (AAO) cladding of NSOF after cyclic thermal treatment at temperatures ranging from 1000°-1500°C with the pore diameter, interpore distance, as well as the cladding thickness as parameters. The cladding/sapphire fiber interface integrity due to possible mismatch in the coefficient of thermal expansion between AAO and sapphire fiber was also examined. We also immobilized Ag nanoparticles in the pore channels of AAO cladding for in-situ SERS measurements in a hot furnace. We will show that Ag nanoparticles confined in the nanoscopic pore channels of AAO exhibit much better thermal stability, compared with those on a planar substrate, making high-temperature harsh environment SERS sensing possible with NSOF.
Kai Liu, Hui Chen, Paul R. Ohodnicki, and Henry Du, "Chemical sensing in harsh environments with nanostructured sapphire optical fiber (Conference Presentation)," Proc. SPIE 10654, Fiber Optic Sensors and Applications XV, 106540T (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 18, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2305877.5783306145001.
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