Suitability of GaP nanoparticles as a surface-assisted laser desorption/ionization mass spectroscopy inorganic matrix and their soft ionization abilityElectronic supplementary information (ESI) available: Experimental details, calculated optical spectra of GaP NPs with various diameters are collected in the ESI. See DOI: 10.1039/c2an36738f

Surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF-MS) using GaP nanoparticles (NPs) prepared by a gas evaporation method was investigated on poly(ethylene glycol)s (PEGs). The mass spectra of PEG and survival yield measurements suggested that larger GaP NPs have a quite high soft ionization ability. Surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF-MS) with a high soft-ionization ability using GaP nanoparticles (NPs) prepared by a gas evaporation method was investigated on polyethylene glycols (PEGs).