Evaluation of coating materials used on piezoelectric sensors for the detection of organophosphorus compounds in the vapour phase

✍ Scribed by Olga S. Milanko; Stevan A. Milinković; Ljubinka V. Rajaković

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 776 KB
• Volume: 269
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85415-3

✦ Synopsis

Several matenals were evaluated as possible coatings for a sensitive, reversible and reproducible plezoelectric sensor for organophosphorus compounds (dnsopropylmethyl phosphonate and 0,0-dimethyl-2,2dlchlorovmyl phosphate) A few expenments were also done with malathion The effects of coating material, concentration and type of compound on sensltmty, revers&rhty and reproduclbdlty were Investigated Mechanisms for the interaction between target vapour and coatings are proposed and bnefiy discussed Keywords Plezoelectrlc sensors, Coatings, Organophosphorus compounds, The use of plezoelectrlc crystals as chemical sensors depends, almost entirely, on the avallablllty of appropriate coatings Smce the mtroductlon of this techmque, dozens of substrates have been tried as possible coatings for the detection of organophosphorus compounds, e g , pesticides, chemical warfare agents and their smmlants Most papers dealing with the use of bulk-wave plezoelectric sensors for organophosphorus compounds m the vapour phase are by Gullbault and co-workers [l-9] Most of the work was aimed at fmdmg a selectwe coatmg, as It 1s well known that a lack of selectlvlty IS the prmclpal drawback of the technique However, there are apphcatlons m