Ionization ability of manganese oxide nanoparticles

Manganese oxide nanoparticles(Mn-O NPs) were prepared by our novel method as reagents for the laser desorption/ionization mass spectrometry (MS) analytes. Reaction times by chemical preparation were controlled as 0.5, 1 and 5 hours, as the result, we succeeded preparing three different types of particles. Particles were characterized by measuring x-ray diffraction pattern (Fig. 1), Fourier transform infrared spectra (Fig. 2), and DC magnetization (Fig. 3). These characterization results indicated that Mn3O4 maintained spinel sturactures but manganese ions got oxidized under the alkaline water solution, that is Mn3O4 phase gradually translated into MnO2 phase.