TY - GEN A1 - Drexler, Christoph A1 - Shishkanova, Tatiana V. A1 - Lange, Christoph A1 - Danilov, Sergey N. A1 - Weiss, Dieter A1 - Ganichev, Sergey D. A1 - Mirsky, Vladimir M. T1 - Terahertz split-ring metamaterials as transducers for chemical sensors based on conducting polymers: a feasibility study with sensing of acidic and basic gases using polyaniline chemosensitive layer T2 - Microchimica Acta N2 - We report on the first application of terahertz metamaterials acting as transducers for chemical sensors based on conducting polymers. In our feasibility study aimed at sensing of gaseous hydrochloric and ammonia, a two-dimensional sensor metamaterial consisting of an array of split-ring resonators on the surface of undoped silicon wafer was prepared. The surface of the resonator was coated with a 150-μm layer of polyaniline. Binding of hydrogen chloride to polyaniline leads to distinct changes in the resonance frequency of the metamaterial. Measurements can be performed both in the reflection and transmission mode. A numerical simulation of the response revealed an increase of both the real and the imaginary components of the dielectric function of the polyaniline film. These changes are attributed to the transition from emaraldine base to emeraldine salt. The results demonstrate a new approach for formation of highly sensitive transducers for chemical sensors. Y1 - 2014 U6 - https://doi.org/10.5283/epub.31493 SN - 1436-5073 VL - 181 SP - 1857 EP - 1862 ER - TY - GEN A1 - Shishkanova, Tatiana V. A1 - Havlik, Martin A1 - Král, Vladimír A1 - Kopecký, Dušan A1 - Matějka, Pavel A1 - Dendisová, Marcela A1 - Mirsky, Vladimir M. T1 - Amino-substituted Tröger’s base: electrochemical polymerization and characterization of the polymer film T2 - Electrochimica Acta N2 - The amino-substituted coumarin derivative of Tröger’s base (CTB) was electrochemically polymerized on the surface of gold electrodes. The obtained polymer films were characterized by SEM, Raman spectroscopy, cyclic voltammetry and in-situ conductometry. Spectroscopic analysis indicates that the polymerization of CTB takes place via oxidation of the aniline fragment of CTB molecule, similar to the polymerization of aniline. The similarity of the polymer backbone to that of the polyaniline is also confirmed by the influence of potential on the film’s conductivity, however the conductivity of the new material is in principle lower than that of polyaniline. SEM shows that the polymer forms a thin layer with a thickness of ~ 100 nm. Possible applications of the new material as an artificial receptor for aromatic analytes containing carboxy-group are proposed. KW - electrochemical polymerization KW - polymer film KW - polymeric Tröger’s base KW - nitrogen heterocycle KW - spectroscopic characterization Y1 - 2017 U6 - https://doi.org/10.1016/j.electacta.2016.12.061 SN - 0013-4686 VL - 224 SP - 439 EP - 445 ER -