Search results for: A.A. Sergeev

Items from 1 to 18 out of 18 results

article

Dendrimeric rhodamine based fluorescent probe for selective detection of Au

M.V. Tutov, A.A. Sergeev, P.A. Zadorozhny, S.Yu. Bratskaya, more

Sensors and Actuators B: Chemical > 2018 > 273 > C > 916-920

Dendrimeric rhodamine-derived chemosensor for highly selective determination of Au in aqueous acidic solutions has been developed. The response mechanism is based on the destruction of the dendrimeric molecule to provide fluorescence enhancement via reducing intramolecular quenching. The probe exhibits linear signal response and allows determination of Au content in aqueous solutions from 5 × 10⁻⁸...

article

On/off rhodamine based fluorescent probe for detection of Au and Pd in aqueous solutions

A.Yu. Mironenko, M.V. Tutov, A.A. Sergeev, Voznesenskiy, more

Sensors and Actuators B: Chemical > 2017 > 246 > C > 389-394

A water-soluble turn on/off rhodamine 6G based fluorescent probe for selective detection of Au and Pd ions in aqueous acidic solutions has been developed. The newly designed probe reacts with [AuCl₄]⁻ and [PdCl₄]²⁻ to generate a product with different optical properties. The probe undergoes a remarkable change in its absorption and emission spectrum upon addition of Au and Pd complexes that is associated...

article

Specific features of europium tris-benzoylacetonate sensor response to gaseous ammonia

S.S. Voznesenskiy, A.A. Sergeev, A.G. Mirochnik, A.A. Leonov, more

Sensors and Actuators B: Chemical > 2017 > 246 > C > 46-52

In this work we present a Eu(III) tris-benzoylacetonate complexes as efficient luminescent chemosensor for gaseous ammonia. It is shown that luminescent and sensor properties of studied samples can be varied by using organic solvents. In dependence of organic solvent type it is possible to create each of one-time-use express sensor systems and continuous monitoring systems. The mechanism of the effect...

article

Special Features of Copper(II) Detection in Aqueous Solutions

A.A. Sergeev, A.Y. Mironenko, A.A. Leonov, A.E. Nazirov, more

Physics Procedia > 2017 > 86 > C > 152-154

New approach to organize fluorescent sensor system for determination of metal ions in aqueous solutions was presented. The approach is based on modification of hydrophilic polymer with sensitive fluorescent indicators. Possibility to register Cu2+ ions by analyzing of luminescence excitation spectra and lifetimes of the sensitive coating is presented.

article

Modification of Optical Properties of CdS-silicate Nanocomposites by Thermal Annealing

A.A. Sergeev, S.S. Voznesenskiy, A.N. Galkina, I.V. Postnova

Physics Procedia > 2017 > 86 > C > 11-14

Temperature influence on optical and structural properties of nanocomposite structures based on cadmium sulfide quantum dots in silicate matrix was investigated. The mechanism of occurrence of reversible laser-induced absorption is proposed. It was found that annealing of nanocomposite up to 120°C leads to substantial change of its absorption and luminescence spectra caused by transformation of quantum...

article

Electrostatic Field Influence on Luminescence Features of Cadmium Sulphide Quantum Dots in Silica Matrix

S.S. Voznesenskiy, A.A. Sergeev, I.V. Postnova, Y.A. Shchipunov

Physics Procedia > 2017 > 86 > C > 15-18

The effect of electrostatic field on optical properties of silicate nanocomposite with cadmium sulfide quantum dots was investigated. It was found that the electrostatic field causes quantum dot orientation along the field force lines leading to changes in the polarized components of the luminescence spectrum. The influence of field force line direction on photoinduced absorption characteristics arised...

article

Characterization and photocatalytic activity of SiO2, FeOx coatings formed by plasma electrolytic oxidation of titanium

M.S. Vasilyeva, V.S. Rudnev, A.A. Zvereva, K.N. Kilin, more

Surface and Coatings Technology > 2016 > 307 > PC > 1310-1314

SiO₂, FeO_x coatings were fabricated by plasma electrolytic oxidation of titanium in a silicate electrolyte with an addition of K₃[Fe(CN)₆]. The structure and elemental and phase compositions of the formed coatings and their surface morphology were characterized by scanning electron microscopy (SEM) in combination with energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS),...

article

H2S optical waveguide gas sensors based on chitosan/Au and chitosan/Ag nanocomposites

A.Yu. Mironenko, A.A. Sergeev, A.E. Nazirov, E.B. Modin, more

Sensors & Actuators: B. Chemical > 2016 > 225 > Complete > 348-353

In this work we present simple technique to fabricate chitosan based nanocomposite coatings containing Ag and Au nanoparticles and investigate the possibility of using these materials as sensitive layer of optical planar waveguide based nonreversible hydrogen sulfide sensors (chemidosimeters). It is shown that chitosan/Ag and chitosan/Au based sensors allows detection of hydrogen sulfide gas at concentration...

article

Development and evaluation of a real-time RT-PCR assay for the detection of Ebola virus (Zaire) during an Ebola outbreak in Guinea in 2014–2015

V.G. Dedkov, N’.F. Magassouba, M.V. Safonova, A.A. Deviatkin, more

Journal of Virological Methods > 2016 > 228 > C > 26-30

In early February 2014, an outbreak of the Ebola virus disease caused by Zaire ebolavirus (EBOV) occurred in Guinea; cases were also recorded in other West African countries with a combined population of approximately 25 million. A rapid, sensitive and inexpensive method for detecting EBOV is needed to effectively control such outbreak. Here, we report a real-time reverse-transcription PCR assay for...

article

Laser Adaptive System for Measurement of Molecule Mass and Concentration

R.V. Romashko, Y.N. Kulchin, T.A. Efimov, A.A. Sergeev, more

Physics Procedia > 2015 > 73 > Complete > 211-215

A Laser adaptive microweighting system for measurement of molecules mass based on the principles of adaptive holog aphic interferometry is proposed and experimentally tested in task of gas concentration measurement. A sensitive element of the system is a microcantilever coated by a layer of chitosan, which can adsorb different molecules. Changes in gas concentration re ult in change in mass of molecules...

article

Integrated-optical sensors based on chitosan waveguide films for relative humidity measurements

S.S. Voznesenskiy, A.A. Sergeev, A.Yu. Mironenko, S.Yu. Bratskaya, more

Sensors & Actuators: B. Chemical > 2013 > 188 > Complete > 482-487

Here we report on fabrication and properties of integrated-optical sensors for relative humidity detection based on waveguide films of chitosan in neutral and salt forms. Obtained sensors have high sensitivity and short response time over a wide range of relative humidity.

article

pH-indicators doped polysaccharide LbL coatings for hazardous gases optical sensing

A. Yu. Mironenko, A.A. Sergeev, S.S. Voznesenskiy, D.V. Marinin, more

Carbohydrate Polymers > 2013 > 92 > 1 > 769-774

Sensitive layer-by-layer (LbL) coatings for optical detection of gaseous NH ₃ and HCl were prepared by self-assembly of oppositely charged polysaccharides (chitosan and λ-carrageenan) followed by doping LbLs with pH-sensitive dyes – bromothymol blue (BTB) and Congo red (CR). It has been shown that CR, being an amphoteric dye, diffuses into LbL films regardless of the charge of the outermost...

article

Investigation of humidity influence upon waveguide features of chitosan thin films

A.A. Sergeev, S.S. Voznesenskiy, S.Y. Bratskaya, A.Y. Mironenko, more

Physics Procedia > 2012 > 23 > Complete > 115-118

Optical properties of chitosan films of different ionic forms as well as their mutual correlation were investigated. By using spectral ellipsometry and mode spectroscopy methods it was discovered that these properties depend upon relative humidity of environment. It was shown that all specimens studied are characterized by the relative humidity thresholds at which their optical properties vary. The...

article

Rapid detection of airborne viruses by personal bioaerosol sampler combined with the PCR device

I.E. Agranovski, A.S. Safatov, A.A. Sergeev, O.V. Pyankov, more

Atmospheric Environment > 2006 > 40 > 21 > 3924-3929

A new personal sampler had been previously developed and verified for monitoring of viable airborne viruses. The aims of this project were to investigate a possibility of the utilization of the polymerase chain reaction (PCR) method to speed up the time consuming analytical procedures and to evaluate a lower detection limit of the combined (sampler-PCR) device. Tenfold serial dilutions of the initial...

article

New personal sampler for viable airborne viruses: feasibility study

I.E. Agranovski, A.S. Safatov, A.I. Borodulin, O.V. Pyankov, more

Journal of Aerosol Science > 2005 > 36 > 5-6 > 609-617

While various sampling methods exist for collecting and enumerating airborne bacteria and fungi, no credible methodology has yet been developed for airborne viruses. A new sampling method for monitoring the personal exposure to bioaerosol particles has recently been developed and evaluated with bacteria and fungi. In this method, bacterial/fungal aerosol is aspirated and transported through a porous...

chapter

Application of composite and defined basic elements in full cycle microwave stripline CAD system

A.A. Sergeev, E.N. Danilochkina, G.A. Pronina

2005 15th International Crimean Conference Microwave&Telecommunication Technology > 2 > 467 - 469 Vol. 2

2005 15th International Crimean Conference Microwave and Telecommunication Technology

In article considered some new features of interactive program for the stripline CAD system. This system is only one from four parts of integrated system "LAMBDA+". Stripline CAD system allows to design circuits, based on different types of microstrip lines and their combinations

article

Personal sampler for airborne viruses; investigation of lower detection limit

I.E. Agranovski, A.S. Safatov, O.V. Pyankov, V.A. Petrishchenko, more

Journal of Aerosol Science > 2004 > 35 > Supplement 1 > 397-410

article

The study of infectious activity of influenza virus aerosol taking into account its deposition in laboratory animal's organism

A.N. Sergeev, A.S. Safatov, V.A. Zhukov, O.V. P’Yankov, more

Journal of Aerosol Science > 2001 > 32 > Supplement 1 > 793-816

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