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Poster Presentations
Day 2, June 23（Mon.）
Room P (Maesato East, Foyer, Ocean Wing)
- 2P-PM-50
Si Pillar Structure for Efficient Laser Soft Ionization
(1Hokkaido Univ., 2JEOL, 3Osaka Univ., 4RIES, Hokkaido Univ.)
oYusuke Fujii1, Junichi Osuga2, Hiroshi Furutani3, Michisato Toyoda3, Yasutaka Matsuo4
Surface-Assisted LDI is a method in which LDI is enhanced by inorganic particles and surface structures and has the advantages of reducing the intensity of the irradiating laser light and eliminating reagents to assist optical absorption. However, the details of the ionization mechanism of SALDI have not been elucidated. Recently, it has been reported that Si pillar structures fabricated by self-assembly particles and etching method enhanced the ionization efficiency. However, it is not possible to design structures free from particle size limitations. In this study, Si pillar structures were fabricated by electron beam lithography and dry etching on Si substrates and ionization efficiency was investigated by MALDI-TOF-MS. As a result, it was shown that ionization is enhanced on substrates with Si pillar structures, and among them, ionization efficiency is significantly enhanced at specific interpillar distances and pillar diameters. The reflectance of each fabricated structure was also measured and its relationship to ionization efficiency was investigated. The results suggest that there is a correlation between ionization efficiency and the decrease in reflectance, and that optical absorption by the Si pillar structure is also important for ionization efficiency. In my poster, based on these results, we will discuss the ionization mechanism by Si pillar structures.