Novel Schiff base compounds exhibit enhanced sensor response to chloroform vapor, suggesting improved detection methods.
Two novel Schiff base compounds, (E)‐4‐((4‐(dimethylamino)benzylidene)amino)benzoic acid ( DMPABA ) and (E)‐4‐(2‐(4‐(dimethylamino)benzylidene)hydrazinyl)benzoic acid ( DMPHBA ), were synthesized to investigate for the vapor sensor behavior against chloroform vapor. DMPABA and DMPHBA thin films were fabricated using the spin coating method. A surface plasmon resonance system was employed to study the sensor response and the adsorption behavior. The Elovich model was chosen to determine the initial adsorption rate ( a ) and the Elovich desorption constant ( b ). Sensor response rates of DMPHBA and DMPABA thin films were determined to be 8.38 and 6.93, respectively. The a values of the DMPHBA and DMPABA thin films were calculated as 2775.97 and 1728.51 ppm mm −2 , respectively. The b value (0.0373 mm 2 s ppm −1 ) of the DMPHBA thin film was lower than the b value (0.0602 mm 2 s ppm −1 ) of the DMPABA thin film. The DMPHBA film against chloroform vapor yielded a better performance than the DMPABA thin film. The chemical difference between the two materials is an ─NH─ group, which improved the sensor response and adsorption behavior.
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Çapan et al. (2025) studied this question.
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