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Work presented here measures and interprets the electrical and thermal conductivities of atomic layer deposited (ALD) free-standing single film and periodic tungsten and aluminum oxide nanobridges with thicknesses from ∼5-20 nm and ∼3-13 nm, respectively. Electrical conductivity of the W films is reduced by up to 99% from bulk, while thermal conductivity is reduced by up to 91%. Results indicate phonon contribution to thermal conductivity is dominant in these ALD films and may be substantially reduced by the incorporation of periodicity in the ALD W/Al2O3 nanolaminates. Additionally, thin film conduction modeling demonstrates nano-structured grain features largely dictate electron and phonon conduction in ALD W. New fabrication methods have allowed for the development of free-standing ultra-thin structures with layers on the order of several nanometers utilizing ALD. While the literature contains diverse studies of the physical properties of thin films prepared by traditional micro-fabrication sputtering or chemical vapor deposition techniques, there remains little data on freestanding structures containing ALD generated materials. Specifically, knowledge of the electrical and thermal conductivity of ALD generated materials will aid in the future development of ultra-thin nano-devices.
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http://dx.doi.org/10.1039/c5nr04885k | DOI Listing |
Front Netw Physiol
December 2024
Department of Physics, University of Alberta, Edmonton, AB, Canada.
A steadily increasing number of publications support the concept of physiological networks, and how cellular bioelectrical properties drive cell proliferation and cell synchronization. All cells, especially cancer cells, are known to possess characteristic electrical properties critical for physiological behavior, with major differences between normal and cancer cell counterparts. This opportunity can be explored as a novel treatment modality in Oncology.
View Article and Find Full Text PDFJ Phys Chem C Nanomater Interfaces
December 2024
Center for Transport Technologies, Battery Technologies, AIT Austrian Institute of Technology GmbH, Giefinggasse 2, Vienna 1210, Austria.
In this work, a battery layup consisting of a poorly flammable ionic liquid electrolyte and a poly(vinylidene fluoride--hexafluoropropylene) (PVdF-HFP) thermoplastic has been developed along with composite anode and cathode electrodes. The developed gel electrolyte exhibits feasible ionic conductivity of about 1 mS/cm at 30 °C. State-of-the-art active electrode materials, i.
View Article and Find Full Text PDFHeliyon
December 2024
Mechanical and Industrial Engineering Department, Abu Dhabi University, Abu Dhabi, 59911, United Arab Emirates.
With the rising demand of electric vehicles (EVs) and hybrid electric vehicles (HEVs), the necessity for efficient thermal management of Lithium-Ion Batteries (LIB) becomes more crucial. Over the past few years, thermoelectric coolers (TEC) have been increasingly used to cool LIBs effectively. This study provides a comprehensive analysis of thermoelectric technologies for improving the thermal management in LIB Systems.
View Article and Find Full Text PDFHigh-performance infrared light sources have significantly influenced the fields of photonics and optoelectronics. However, achieving infrared light emission with low energy consumption, high brightness, and rapid response remains a huge challenge. Single-walled carbon nanotubes (SWCNTs) could be an important candidate for infrared light emitters because of their superior electron mobility and phonon transport efficiency.
View Article and Find Full Text PDFToxicol Rep
December 2024
Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States.
Unlabelled: Thermal spray, in general, is a process that involves forcing a melted substance, such as metal or ceramic in the form of wire or powder, onto the surface of a targeted object to enhance its desired surface properties. In this paper, the melted substance is metal wire generated by an electric arc and forcibly coated on a rotary iron substrate using compressed air. This thermal process is referred to as double-wire arc thermal spray.
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