| Popis: |
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 Mn 3 O 4 maintained spinel sturactures but manganese ions got oxidized under the alkaline water solution, that is Mn 3 O 4 phase gradually translated into MnO 2 phase. |
