3 research outputs found
Thermoelectric properties of low-cost transparent single wall carbon nanotube thin films obtained by vacuum filtration
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The dispersions of semiconducting (sc-) and metallic (m-) SWCNTs with purity more than 98 and 86%, correspondingly,
were obtained by using the aqueous two-phase extraction method. The unseparated (un-) SWCNTs
contained ~3/4 of semiconducting and ~1/4 of metallic nanotubes. Thin films based on unseparated, semiconducting
and metallic SWCNTs were prepared by vacuum filtration method. An Atomic Force Microscopy
(AFM) and a Transmission Electronic Microscopy (TEM) were used to investigate the thin film microstructure.
The thin SWCNT film transmittance was measured in the wavelength range of 300–1500 nm. Thermoelectric
properties were carried out in the temperature range up to 200 °C. The largest Seebeck coefficient was observed
for thin films based on semiconducting SWCNTs. The maximum value was 98 μV/K under the temperature of
170 °C. The lowest resistivity was 7.5·10−4·Ohm·cm at room temperature for thin un-SWCNT films. The power
factor for m-SWCNT and un-SWCNT films was 47 and 213 μWm−1 K−2, correspondingly, at room temperature
and 74 and 54 μWm−1 K−2 at 200 °C, respectively. For a thin sc-SWCNT film the maximum power factor was
2.8 μWm−1 K−2 at 160 °C. The un-SWCNT film thermal conductivity coefficient was 5.63 and 3.64Wm−1 K−1
and a thermoelectric figure of merit was 0.011 and 0.016 at temperatures of 23 and 50 °C, respectively
Сталь 110Г13Л. Термомагнитные и гальваномагнитные эффекты в ее пленках
The article shows the ability to control magnetic properties due to modulation of phases in
the film with varying temperature of growth. So, at low growth temperatures, a film is formed with
an axis of easy magnetization in plane. An increase in temperature leads to a change in the phase
composition of the film. It is shown that the presence of even a small component of the magnetization
vector in the perpendicular direction leads to the appearance of a thermomagnetic effect of a large
magnitude with respect to thermal noiseВ статье показана возможность управления магнитными свойствами за счет модуляции фаз в пленке при варьировании температуры роста структуры. Так, при низких температурах
формируется пленка с осью легкого намагничивания в плоскости. Повышение температуры приводит к изменению фазового состава пленки. Показано, что наличие даже небольшой компоненты
вектора намагниченности в перпендикулярном направлении приводит к возникновению термомагнитного эффекта большой относительно тепловых шумов величин