Abstract
Desorption/ionization on silicon (DIOS) mass spectra of methylene blue (MB+Cl−) were studied using p+-type oxidized monofunctional porous silicon (PS-OX mono ) free layers. Reduction/protonation processes of methylene blue (MB) dye were investigated. It was shown that SiH x terminal sites on oxidized surface of porous silicon (PS-OX) are not the rate-determining factor for the reduction/protonation in DIOS. Tunneling of electron through the dielectric layer of nanostructures on silicon surface under effect of local electrostatic and electromagnetic fields is considered to be the most significant factor of adsorbate–adsorbent electron exchange and further laser-induced ion formation.
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Acknowledgment
I.V.S. and V.A.P. highly appreciate financial support of this study by Science and Technology Center in Ukraine (Project # 4918).
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Shmigol, I., Alekseev, S., Lavrynenko, O., Zaitsev, V., Barbier, D., Pokrovskiy, V. (2009). Surface-Assisted Laser Desorption Ionization of Low Molecular Organic Substances on Oxidized Porous Silicon. In: Shpak, A., Gorbyk, P. (eds) Nanomaterials and Supramolecular Structures. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2309-4_4
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