Samoylov, Anton V. and Mirsky, Vladimir M. and Hao, Qingli and Swart, Claudia and Shirshov, Yuri M. and Wolfbeis, Otto S. (2005) Nanometer-thick SPR sensor for gaseous HCl. Sensors and Actuators B Chemical 106 (1), pp. 369-372.
Download (148kB) - Repository staff only
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.
|Date:||29 April 2005|
|Institutions:||Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Otto S. Wolfbeis)|
|Keywords:||Gas sensor; HCl sensors; Surface plasmon resonance; Electropolymerization; Poly-(N-methyl-aniline); Fire detector|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||04 Apr 2011 10:49|
|Last Modified:||21 Jul 2011 02:10|