Heterogeneous optochemical VOC sensing layers selected by ESI-mass spectrometry

• Published in: Biosensors & bioelectronics 2006-09, Vol.22 (3), p.415-422
• Main Authors: Ciccarella, G., Spadavecchia, J., Rella, R., Vasapollo, G., Mastrorilli, P., Suranna, G.P.
• Format: Article
• Language: English
• Subjects: Biocompatible Materials - analysis; Biocompatible Materials - chemistry; Biological and medical sciences; Biosensing Techniques - methods; Biotechnology; Boron Compounds - analysis; Boron Compounds - chemistry; Complex Mixtures - analysis; Complex Mixtures - chemistry; Electrospray; Fundamental and applied biological sciences. Psychology; Indoles - analysis; Indoles - chemistry; Methods. Procedures. Technologies; Optics and Photonics; Optochemical sensing; Organic Chemicals - analysis; Others; Phthalocyanines; Platinum(II) complexes; Spectrometry, Mass, Electrospray Ionization - methods; Spectrum Analysis - methods; Various methods and equipments; Volatilization
• ISSN: 0956-5663; 1873-4235
• DOI: 10.1016/j.bios.2006.05.019

Spin-coated films of 29H,31H-tetra-4-(2,4-di- tert-amylphenoxy)phthalocyanine (H 2Pc) and [κ P,μ-κ S-(dppeS)Pt(CH 3)] 2[BF 4] 2 have been used as sensing layers deposited in thin film form for the detection of VOCs. The sensing behaviour of the blend was predicted on the basis of mass spectrometric determinations performed on H 2Pc/Pt-complex solutions, by monitoring the formation of gas-phase ions at the electrospray interface. The addition of small amounts of acetonitrile produced a [ M + 41] + peak whereas the addition of similar amounts of methanol, ethanol and isopropyl alcohol did not give the corresponding [ M + ROH] + species. These results were confirmed by sensing tests. A pure phthalocyanine optosensing element did not show relevant selectivity. Conversely, the heterogeneous sensing layer obtained by spin-coating deposition of a Pt-complex/H 2Pc blend allowed the sensing of acetonitrile vapours with respect to the above mentioned alcohols.