Composite nanostructure of vertically aligned carbon nanotube array and planar graphite layer obtained by the injection CVD method

The carbon nanostructure composed of an array of vertically aligned carbon nanotubes (CNTs) and a planar graphite layer (PGL) located at the top of the array has been obtained by the injection chemical vapor deposition method, realized using high temperature catalytic pyrolysis of xylene-ferrocene mixture. The carbon nature of the planar layer was identified using Auger electron spectroscopy. Scanning electron microscopy analysis enabled to ascertain peculiarities of CNT-PGL nanostructure morphology, in particular, the internal layer-built structure of PGL and its links with the underlying CNT array. The mechanism of CNT-PGL nanostructure formation was considered

Mössbauer spectroscopy investigation of magnetic nanoparticles incorporated into carbon nanotubes obtained by the injection CVD method

This paper is devoted to the investigation of phase composition of the magnetic filler located inside multi-wall carbon nanotubes (CNTs) using Mössbauer spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). CNTs were obtained by the injection CVD method using ferrocenexylene solution under various conditions (i.e., the ferrocene concentration cx (1%, 5%, and 10%), slow or fast cooling down rates of the synthesis reactor, temperature in the reaction zone during synthesis), which can influence the magnetic properties of CNTs owing to different contribution of Fe-containing phases. SEM and TEM methods were applied to investigate morphology and structure of the synthesized material. It was shown that Fe₃C phase formation is favorable at high content of the catalyst in the feeding solution (10%), relatively low temperatures (775 ºC) during CNTs synthesis, as well as long duration of the CNTs growth process (5 min). The cooling rate of the reactor after CNTs synthesis was not crucial to iron phase contribution in our experiments

ВЛИЯНИЕ ИНТЕРФЕРЕНЦИИ НА ЭФФЕКТИВНОСТЬ ИНВЕРТИРОВАННЫХ ФОТОВОЛЬТАИЧЕСКИХ ЯЧЕЕК

An expression and the analysis of the external quantum efficiency (EQE) for for inverted flat heterojunction based on copper phthalocyanine and fullerene. The analysis of the external quantum efficiency of photovoltaic cells has shown that the averaging EQE over the spectrum of solar radiation for the inverted cell interference redistribution has little effect on the EQE and optimization of cells to the thickness of its layers does not lead to a significant increase in quantum efficiency.Получено выражение и выполнен анализ внешней квантовой эффективности (EQE) для инвертированных фотовольтаических ячеек с плоским гетеропереходом на основе фталоцианина меди и фуллерена с одним и двумя прозрачными электродами. Показано, что при усреднении EQE по спектру солнечного излучения для инвертированных ячеек интерференционное перераспределение оказывает слабое влияние на EQE и оптимизация ячеек по толщинам составляющих ее слоев не приводит к значительному повышению квантовой эффективности

Growth of few-wall carbon nanotubes with narrow diameter distribution over Fe-Mo-MgO catalyst by methane/acetylene catalytic decomposition

Few-wall carbon nanotubes were synthesized by methane/acetylene decomposition over bimetallic Fe-Mo catalyst with MgO (1:8:40) support at the temperature of 900°C. No calcinations and reduction pretreatments were applied to the catalytic powder. The transmission electron microscopy investigation showed that the synthesized carbon nanotubes [CNTs] have high purity and narrow diameter distribution. Raman spectrum showed that the ratio of G to D band line intensities of IG/ID is approximately 10, and the peaks in the low frequency range were attributed to the radial breathing mode corresponding to the nanotubes of small diameters. Thermogravimetric analysis data indicated no amorphous carbon phases. Experiments conducted at higher gas pressures showed the increase of CNT yield up to 83%. Mössbauer spectroscopy, magnetization measurements, X-ray diffraction, high-resolution transmission electron microscopy, and electron diffraction were employed to evaluate the nature of catalyst particles

INTERFERENCE EFFECTS ON EFFICIENCY Inverted photovoltaic CELLS

An expression and the analysis of the external quantum efficiency (EQE) for for inverted flat heterojunction based on copper phthalocyanine and fullerene. The analysis of the external quantum efficiency of photovoltaic cells has shown that the averaging EQE over the spectrum of solar radiation for the inverted cell interference redistribution has little effect on the EQE and optimization of cells to the thickness of its layers does not lead to a significant increase in quantum efficiency

Aerospace information processing methods in monitoring and control systems

This article analyzes the benefits of using remote sensing for monitoring and control systems. Based on the analysis of the created fire hazard assessment systems in forests, conclusions are drawn about the features and tasks in implementing such a system in Belarus

Carbon Nanotube-Based Composites Synthesized Using Porous Aluminum Oxide

This book of nanoscience and nanotechnology provides an overview for researchers, academicians and industrials to learn about scientific and technical advances that will shape the future evolution of composite materials reinforced with carbon nanotubes (CNTs). It involves innovation, addresses new solutions and deals with the integration of CNTs in a variety of high performance applications ranging from engineering and chemistry to medicine and biology. The presented chapters will offer readers an open access to global studies of research and innovation, technology transfer and dissemination of results and will respond effectively to challenges related to this complex and constantly growing subject area