Heterogeneous optochemical VOC sensing layers selected by ESI-mass spectrometry.
Spin-coated films of 29H,31H-tetra-4-(2,4-di-tert-amylphenoxy)phthalocyanine (H(2)Pc) and [kappaP,mu-kappaS-(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(2)Pc/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(2)Pc blend allowed the sensing of acetonitrile vapours with respect to the above mentioned alcohols.
Ciccarella
G
G
Dip. di Ingegneria dell'Innovazione, Università degli Studi di Lecce, Via Monteroni, 73100 Lecce, Italy. giuseppe.ciccarella@unile.it
Spadavecchia
J
J
Rella
R
R
Vasapollo
G
G
Mastrorilli
P
P
Suranna
G P
GP
D001672:Biocompatible Materials / Q000032:analysis / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D001896:Boron Compounds / Q000032:analysis / Q000737:chemistry*; D045424:Complex Mixtures / Q000032:analysis / Q000737:chemistry; D007211:Indoles / Q000032:analysis / Q000737:chemistry*; D054833:Isoindoles; D055095:Optics and Photonics; D009930:Organic Chemicals / Q000032:analysis*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013057:Spectrum Analysis / Q000379:methods*; D014835:Volatilization
D001672:Biocompatible Materials; D001896:Boron Compounds; D045424:Complex Mixtures; D007211:Indoles; D054833:Isoindoles; D009930:Organic Chemicals; C013647:phthalocyanine