This application note reports on TERS characterization of crystalline nanoparticles that are prepared by spray flash evaporation of two explosive organic coumpounds: CL-20 and HMX. The TERS surface sensitivity reveals that TER intensities of CL-20 and HMX band markers are inverted in comparison with their intensities in the bulk, which leads to the conclusion that the surface of the CL-20/HMX co-crystals nano-plates is HMX-terminated. This surface structure gives insights for an impact ignition mechanism and explains the close impact sensitivity values of HMX and CL-20/HMX co-crystals.
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