@misc{LangeIvanovLyutovetal., author = {Lange, Ulrich and Ivanov, Svetlozar D. and Lyutov, Vladimir V. and Tsakova, Vessela T. and Mirsky, Vladimir M.}, title = {Voltammetric and conductometric behaviour of self assembled multilayer nanocomposites of polyaniline and gold nanoparticles}, series = {Journal of Solid State Electrochemistry}, volume = {14}, journal = {Journal of Solid State Electrochemistry}, number = {7}, issn = {1432-8488}, doi = {10.1007/s10008-009-0922-2}, pages = {1261 -- 1268}, abstract = {Multilayer nanocomposites from polyaniline (PANI) and gold nanoparticles (AuNPs) were formed by layer-by-layer deposition. The formation of PANI-AuNPs multilayer structures was monitored by UV-vis absorption spectroscopy and cyclic voltammetry. Each deposited bilayer of PANI-AuNPs led to a monotonous and almost linear increase in both optical absorbance and the first current peak of PANI oxidation. The prepared multilayer nanocomposites were characterized by in situ conductivity measurements at different pH and potential and by transmission electron microscopy. Finally, chemosensitive properties of the new material based on the intrinsic affinity of gold nanoparticles were studied. Changes in the film resistance on exposure to vapors of mercury and sulfur-containing compounds were observed.}, language = {en} } @misc{KurniawanTsakovaMirsky, author = {Kurniawan, Fredy and Tsakova, Vessela T. and Mirsky, Vladimir M.}, title = {Gold nanoparticles in non-enzymatic electrochemical detection of sugars}, series = {Electroanalysis}, volume = {18}, journal = {Electroanalysis}, number = {19-20}, issn = {1521-4109}, doi = {10.1002/elan.200603607}, pages = {1937 -- 1942}, abstract = {A nonenzymatic electrochemical sensor for detection of sugars was prepared by layer-by-layer deposition of gold nanoparticles on thin gold electrodes. The deposition was optimized by using of surface plasmon resonance. Voltammetric investigation and impedance spectroscopy of the sensor was performed. Electrical currents caused by glucose on bare gold electrodes and on gold electrodes coated by immobilized gold nanoparticles were compared. The electrodes with nanoparticles display much higher current of glucose oxidation. The oxidation becomes blocked when the swept electrode potential exceeded +0.25 V, during the back scan an oxidation peak is observed again but at less positive potential. The magnitudes of these current peaks are linearly dependent on the glucose concentration; this dependence can be used as calibration for analytical applications. The limit of detection for glucose is below 0.5 mM, the sensitivity (normalized to the macroscopic electrode surface) is about 160 μA cm-2 mM-1. The sensor response is linear till at least 8 mM of glucose concentration.}, language = {en} }