RI: CCD-FO Assembly for Spectroscopic Characterization of Flame Synthesis Processes

摘要

Funds from the ARO Research Instrumentation (RI) Program were used to upgrade the CCD-fiber-optic assembly of an intensified-CCD (ICCD) detector. The detector is coupled with an imaging spectrometer for use in the on-going ARO project, 'Novel Flame-Based Synthesis of Nanowires for Multifunctional Application,' (Grant W911NF-08-1-0417) on the synthesis of nanowires of MoO3, CuO, WO3, Fe2O3, Bi2O3, and MnO2 for nano-energetic applications involving thermite reactions with nano-Al. Specifically, the CCD-FO component of the detector is used as part of a laser-based spectroscopy setup to determine local gas-phase temperatures and major species concentrations, along with nanomaterial characteristics, during synthesis. The instrumentation can also be used as an imaging camera for planar laser-induced florescence (PLIF) and molecular filtered Rayleigh scattering (FRS). The metal-oxide nanowires, which can be exploited for tailored heat release, are synthesized using strategic flame-based configurations that can be easily probed for conditions conducive to nanowire growth that can be translated to other geometries and even perhaps other gas-phase synthesis methods for large-scale production. To optimize processing, fundamental understanding of the mechanisms involved in the gas- phase processing flow field is crucial. By measuring the major fields in the synthesis process, the full aero-thermo-chemical nature of the process can be characterized. As such, the upgraded instrumentation readily enhances the quality of current ARO research.