Abstract
AbstractA simple approach for the preparation of emitter of electrospray ionization mass spectrometry by covalently coating the fused‐silica capillary tip with the conductive carbon‐nanotube sol‐gel composite material (CNTSCM) is described. The CNTSCM was prepared by dispersing single‐walled carbon nanotubes in the sol composed of a mixture of 3‐glycidoxypropyltrimethoxysilane and 3‐aminopropyltrimethoxysilane, and ethanol. The long‐term stability of the prepared ESI emitters was demonstrated by at least 180 h of continuous use. Signal intensity obtained by the prepared emitter was mass‐flux sensitive when the flow rate was lower than 500 nL/min, while the signal intensity performed a concentration dependence when the flow rate was in the range of 500–800 nL/min. The usefulness of such a prepared emitter was demonstrated by the analysis of various types of samples such as organic small molecular drugs, oligosaccharide, peptide, and protein.
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