Interaction of nitrogen dioxide with sulfonamide-substituted phthalocyanines: Towards NO2 gas sensor

0377481 - ÚMCH 2013 RIV CH eng J - Journal Article
Pochekailov, Sergii - Nožár, Juraj - Nešpůrek, Stanislav - Rakušan, J. - Karásková, M.
Interaction of nitrogen dioxide with sulfonamide-substituted phthalocyanines: Towards NO2 gas sensor.
Sensors and Actuators B - Chemical. Roč. 169, 5 July (2012), s. 1-9. E-ISSN 0925-4005
R&D Projects: GA AV ČR KAN400720701; GA MPO FR-TI1/144
Institutional research plan: CEZ:AV0Z40500505
Keywords : phthalocyanine * sulfonamide * nitrogen dioxide
Subject RIV: CG - Electrochemistry
Impact factor: 3.535, year: 2012

We study the properties of soluble sulfonamide-substituted zinc and metal-free phthalocyanines. The sensing capabilities of these materials are discussed in detail. We have found that Zn sulfonamide-substituted phthalocyanine (Pc) forms a charge transfer complex with nitrogen dioxide, which results in a change of absorption spectrum and an increase of electrical conductivity as much as two orders of magnitude. On the other hand, metal-free Pc does not form the complex and its interaction with nitrogen dioxide is based on weak Van-der-Waals forces. The absorption spectrum does not change and the electrical conductivity slightly decreases during nitrogen dioxide exposure. We have also found that these materials, unlike literature reported derivatives, are reversibly sensitive to nitrogen dioxide at room temperature. This opens a great potential for the fabrication of cheap and reliable gas sensors.
Permanent Link: http://hdl.handle.net/11104/0209626