CH3NH3PbBr3 Nanocrystals Formed in situ in Polystyrene Used for Increasing the Color Rendering Index of White Leds

Theoretical and Experimental Chemistry - A new method is proposed for the formation of MAPbBr3 nanoparticles in situ in a dispersion of polystyrene in toluene in the absence (MAPbBr3@PS) and...     

Effect of electrosynthesis conditions on the electrochemical and spectral characteristics of copolymers of pyrrole and 3-phenylthiophene

Copolymers of pyrrole and 3-phenylthiophene were obtained by electrochemical polymerization. These copolymers were identified by IR and electronic spectroscopy. The composition, electrochemical properties, and spectral indices of the copolymers depend on the potential for deposition from the monomer mixture and the ratio of pyrrole to 3-phenylthiophene.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 29, No. 2, pp. 159–164, March–April, 1993.The authors express their gratitude Academician V. D. Pokhodenko of the Academy of Sciences of Ukraine for his advice and comments in a discussion of this work.     

Effect of Confinement on Structural and Spectral Characteristics of Composites of CsPbX3 Halide Perovskite Nanoparticles with Zeolites of Faujasite Structure

Theoretical and Experimental Chemistry - CsPbBr3–zIz/Y(X) nanocomposites based on FAU (Y and X) zeolites and halide perovskite nanoparticles (HP NP) with CsPbBr3–zIz composition (z = 0...     

Effect of Keggin-type heteropolyacids on electron transfer in TiO<Subscript>2</Subscript>/conjugated organic polymer (MEH-PPV) hybrid nanocomposites

Electron transfer occurs in composites derived from TiO₂ (TiO₂∙HPA) and MEH-PPV from the polymer macromolecules to the inorganic matrix as indicated by the hypsochromic shift of the absorption and luminescence bands of the polymer as well as an increase in intensity of the EPR signal of the organic radical. The increased efficiency of electron transfer in going from TiO₂/MEH-PPV to TiO₂∙PTA/MEH-PPV and TiO₂∙PMA/MEH-PPV may be related to an increase in this order of electron acceptor properties of the inorganic matrix due to the introduction of HPA.     

The effect of the nature of the dopant on the sensor response of poly(3-methylthiophene) films

The effect of the nature of the dopant on the response of a sensor array based on films of poly(3-methylthiophene) under the influence of various organic solvents was studied. It was established that the electroconductivity of the polymer can both increase and decrease under the influence of the analytes. It was suggested that the main factors determining the magnitude of the response of poly(3-methylthiophene) are the ratio of the number of radical-cationic and dicationic states in the polymer, which depends on the nature of the dopant-anion, and also the polarity of the analyte. It was shown that the polymer has high sensitivity to chloroform vapor, which makes sensor arrays based on poly(3-methylthiophene) selective with respect to this analyte. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 6, pp. 331–338, November–December, 2006.     

Effect of the method of production of the inorganic matrix on the spectral characteristics of hybrid ZnO/MEH-PPV nanocomposites

The effect of the method of production of ZnO (the sol-gel method, thermal decomposition of zinc salts, template synthesis) on the optical and photoluminescent characteristics of nanocomposites with an organic semiconducting polymer (MEH-PPV) was determined. It was shown that the presence of zinc oxide nanoparticles shifts the absorption and luminescence bands of MEH-PPV toward the blue side. This may be caused both by change in the conformation of the macromolecules during their interaction with the surface of the inorganic matrix and by the disturbing action of the ZnO particles on the position of the energy levels of the polymer. Translated from Teoreticheskaya i éksperimental'naya Khimiya, Vol. 44, No. 6, pp. 331–337, November–December, 2008.     

The Effect of Heteropolyanion-Dopants on the Physicochemical and Electrochemical Characteristics of 3-Substituted Polythiophenes

It was shown that the physicochemical and electrochemical characteristics of 3-substituted polythiophenes, doped with Keggin-type heteropolyanions (PMo_12–n V _n O^(3+n)– ₄₀, n = 0-2), are determined both by the nature of the substituent at the position of the thiophene ring and by the redox characteristics of the dopants.     

Spectral Characteristics of Mechanochemically Prepared Perovskite CH3NH3PbBr3 Nanoparticles Passivated by Amines with Different Alkyl Chain Length

Theoretical and Experimental Chemistry - We are the first to establish that the introduction of a small amount of passivating amine (Am) during the preparation of CH3NH3PbBr3 (MAPbBr3) (MA/Am =...