Fabrication of layer-stacked nanoparticles on the plate for environmental and biosensing application

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Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using organic matrices is a soft ionization technique that causes very less fragmentation of the analytes. However, matrix ion interface and detector saturation are inevitable in the MALDI-MS analysis of low-mass molecules (<m/z 500), and this makes the characterization of small molecules difficult despite the significance of such characterization. As an approache involving the use of organic-matrix-free LDI-MS for analyzing small molecules in a MALDI instrument, we have investigated a new and facile method for synthesizing layer-stacked nanoparticles on the plate for the applications of surface-assisted laser desorption/ionization-mass spectrometry (SALDI-MS). New types of nanostructured substrates for organic-matrix-free LDI-MS have been found : (1) layer-by-layer (LBL) self-assembled films(polymer/gold) and (2) cationic-polymer-coated graphite sheets(polymer/graphite). The feasibility of using these nanomaterials for SALDI-MS has been demonstrated.