Use of Langmuir-Blodgett films as modifiers for piezoresonance sensors
Tóm tắt
Films based on arachic acid, alkylated calixresorcinarenes, and β-cyclodextrin were prepared on the surfaces of piesoresonance sensors using the Langmuir-Blodgett method. A linear relationship between the frequency shift of the piesoresonance sensor and the number of monolayers was found in all of the test diphilic compounds. The Langmuir-Blodgett films were used as surface modifiers in piesoresonance sensors for the determination of nitroalkanes. The reversibility of sensor signals, that is, the complete regeneration of the films after blowing with air for 1–3 min, was an important property of the sensors. The sensing coating proposed was characterized by a long lifetime: it withstood 80–100 sorption-desorption cycles. The sensor noise level was ±20 Hz.
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