Article 1 Confocal Raman microscopy 1 Pharmaceutic composites 1 Raman spectrometry 1 SERS 1 Sub-micron particles Surface characterization 1 X ray powder diffraction 1 aerosol 1 confocal microscopy 1 controlled study 1 crystal structure 1 evaporation 1 furosemide 1 microscopy 1 nanocrystal 1 particle size 1 povidone 1 scanning electron microscopy 1 silver 1 surface enhanced Raman spectroscopy 1 surface property 1