Repozytorium publikacji - Politechnika Gdańska

Carbon nanowalls, vertically aligned graphene nanosheets, attract attention owing to their tunable band-gap, high conductivity, high mechanical robustness, high optical absorbance and other remarkable properties. In this paper, we report for the first time, the use of hydrophobic boron-doped carbon nanowalls (CNWs) for laser desorption/ionization of small compounds and their subsequent detection by mass spectrometry (LDI-MS). The proposed method offers sensitive detection of various small molecules in absence of organic matrix. The CNWs were grown by microwave plasma enhanced chemical vapor deposition (MW-PECVD), using a boron-carbon gas flow ratio of 1200 in H2/CH4 plasma, on silicon <100> wafer. The hydrophobicity of the surface offers a straightforward MS sample deposition, consisting in drop casting solutions of analytes and drying in air. Limit of detections in the picomolar and femtomolar range (25 fmol/µl for neurotensin) were achieved for different types of compounds (fatty acids, lipids, metabolites, saccharides and peptides) having clinical or food industry interests. This rapid and sensitive procedure can also be used for quantitative measurements without internal standards with RSDs <19%, as in the case of glucose in either aqueous solutions (LOD=0.32±0.02 pmol), blood serum or soft drinks, as well. Moreover, melamine (63±8.19 ng/µL), a toxic compound, together with creatinine and paracetamol, were detected in urine samples, while lecithin was detect in food supplements.

Autorzy

• Ioana Hosu,
• dr hab. inż. Michał Sobaszek link otwiera się w nowej karcie ,
• dr inż. Mateusz Ficek link otwiera się w nowej karcie ,
• dr hab. inż. Robert Bogdanowicz link otwiera się w nowej karcie ,
• Hervé Drobecq,
• Luc Boussekey,
• Alexandre Barras,
• Oleg Melnyk,
• Rabah Boukherroub,
• Yannick Coffinier