@misc{SamoylovMirskyHaoetal., author = {Samoylov, Anton V. and Mirsky, Vladimir M. and Hao, Qingli and Swart, Claudia and Shirshov, Yuri M. and Wolfbeis, Otto S.}, title = {Nanometer-thick SPR sensor for gaseous HCl}, series = {Sensors and Actuators B: Chemical}, volume = {106}, journal = {Sensors and Actuators B: Chemical}, number = {1}, issn = {0925-4005}, doi = {10.1016/j.snb.2004.08.029}, pages = {369 -- 372}, abstract = {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.}, language = {en} } @misc{AndoSwartPringsheimetal., author = {Ando, Masanori and Swart, Claudia and Pringsheim, Erika and Mirsky, Vladimir M. and Wolfbeis, Otto S.}, title = {Optical ozone sensing properties of poly(2-chloroaniline), poly(N-methylaniline) and polyaniline films}, series = {Sensors and Actuators B: Chemical}, volume = {108}, journal = {Sensors and Actuators B: Chemical}, number = {1-2}, issn = {0925-4005}, doi = {10.1016/j.snb.2004.12.083}, pages = {528 -- 534}, abstract = {The ozone-sensitive visible/near-IR absorbance changes of poly(2-chloroaniline) (P(2ClANI)), poly(N-methylaniline) (P(NMeANI)) and polyaniline (PANI) films were investigated. These three polymer films, which were assumed to be present partially in a protonated form and partially in a reduced form, were prepared by chemical oxidation of the monomers followed by treatment with the reducing agent disodium disulfite. The P(2ClANI) film was sensitive to ozone at concentrations of down to 2.5 ppm, but saturation of sensitivity started to appear above 50 ppm. By contrast, the PANI and P(NMeANI) films were sensitive to ozone in a concentration range of 50-100 ppm without showing saturation of sensitivity.}, language = {en} } @misc{AndoSwartPringsheimetal., author = {Ando, Masanori and Swart, Claudia and Pringsheim, Erika and Mirsky, Vladimir M. and Wolfbeis, Otto S.}, title = {Ozone sensing properties of polyaniline derivatives}, series = {Chemical Sensors (Suppl. B)}, volume = {20}, journal = {Chemical Sensors (Suppl. B)}, pages = {534 -- 535}, language = {en} } @misc{AndoSwartPringsheimetal., author = {Ando, Masanori and Swart, Claudia and Pringsheim, Erika and Mirsky, Vladimir M. and Wolfbeis, Otto S.}, title = {Optical ozone detection by use of polyaniline film}, series = {Solid State Ionics}, volume = {152-153}, journal = {Solid State Ionics}, issn = {0167-2738}, doi = {10.1016/S0167-2738(02)00338-7}, pages = {819 -- 822}, abstract = {We report on the optical ozone sensitivity of a polyaniline (PANI) film prepared on the inner wall of a polystyrene cuvette by chemical oxidation of aniline from aqueous solution. The PANI film showed changes of optical absorbance in the presence of 50-100 ppm ozone in air at room temperature. The absorbance change was largest at wavelengths in the range of 500-800 nm. The absorbance changes brought about by ozone was partially reversible after removal of ozone from the atmosphere. These results suggest that PANI is a potential material for optical ozone detection.}, language = {en} }