TY - GEN A1 - Samoylov, Anton V. A1 - Mirsky, Vladimir M. A1 - Hao, Qingli A1 - Swart, Claudia A1 - Shirshov, Yuri M. A1 - Wolfbeis, Otto S. T1 - Nanometer-thick SPR sensor for gaseous HCl T2 - Sensors and Actuators B: Chemical N2 - The optical properties of electrochemically polymerized N-methylaniline are changed in the presence of gaseous hydrogen chloride. This effect was used for preparation of chemical sensors with transduction based on surface plasmon resonance. The interaction of hydrogen chloride with a two nm layer of poly-(N-methylaniline) on gold leads to the shift of the surface plasmon resonance. The analysis of the resonance spectra demonstrates that the effect is caused by an increase of the imaginary component of the refractive index; a minor contribution is also provided by film condensation leading to an increase of the real component of the refractive index and a decrease in the thickness. The effect is selective and quasi-reversible. The concentration dependence of the gas effect obeys Langmuir's adsorption isotherm with a reciprocal value of the binding constant of 850 ± 160 ppm. KW - Gas sensor KW - HCI sensors KW - Surface plasmon resonance KW - Electropolymerization KW - Poly-(N-methyl-aniline) KW - Fire detector Y1 - 2005 U6 - https://doi.org/10.1016/j.snb.2004.08.029 SN - 0925-4005 VL - 106 IS - 1 SP - 369 EP - 372 ER -