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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Indium Oxide—Single-Walled Carbon Nanotube Composite for Ethanol Sensing at Room Temperature
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Room Temperature Morphologies of Precise Acid- and Ion-Containing Polyethylenes
Abstract not provided
Room-temperature ferroelectricity in supramolecular networks of charge-transfer complexes
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Hydrolytic cleavage of both CS 2 carbon–sulfur bonds by multinuclear Pd(II) complexes at room temperature
Developing homogeneous catalysts that convert CS 2 and COS pollutants into environmentally benign products is important for both fundamental catalytic research and applied environmental science. Here we report a series of air-stable dimeric Pd complexes that mediate the facile hydrolytic cleavage of both CS 2 carbon–sulfur bonds at 25 °C to produce CO 2 and trimeric Pd complexes. Oxidation of the trimeric complexes with HNO 3 regenerates the dimeric starting complexes with the release of SO 2 and NO 2 . Isotopic labelling confirms that the carbon and oxygen atoms of CO 2 originate from CS 2 and H 2 O, respectively, and reaction intermediates were observed by gas-phase and electrospray ionization mass spectrometry, as well as by Fourier transform infrared spectroscopy. We also propose a plausible mechanistic scenario based on the experimentally observed intermediates. Here, the mechanism involves intramolecular attack by a nucleophilic Pd–OH moiety on the carbon atom of coordinated µ-OCS 2 , which on deprotonation cleaves one C–S bond and simultaneously forms a C–O bond. Coupled C–S cleavage and CO 2 release to yield [(bpy) 3 Pd 3 ( µ3 -S) 2 ](NO 3 ) 2 (bpy, 2,2'-bipyridine) provides the thermodynamic driving force for the reaction.
Efficient Room-Temperature Nuclear Spin Hyperpolarization of a Defect Atom in a Semiconductor
Abstract not provided
Tetragonal phase of epitaxial room-temperature antiferromagnet CuMnAs
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Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature
The field of valleytronics has promised greater control of electronic and spintronic systems with an additional valley degree of freedom. However, conventional and two-dimensional valleytronic systems pose practical challenges in the utilization of this valley degree of freedom. Here we show experimental evidences of the valley effect in a bulk, ambient, and bias-free model system of Tin(II) sulfide. We elucidate the direct access and identification of different sets of valleys, based primarily on the selectivity in absorption and emission of linearly polarized light by optical reflection/transmission and photoluminescence measurements, and demonstrate strong optical dichroic anisotropy of up to 600% and nominal polarization degrees of up to 96% for the two valleys with band-gap values 1.28 and 1.48 eV, respectively; the ease of valley selection further manifested in their non-degenerate nature. Such discovery enables a new platform for better access and control of valley polarization.
Strain-induced room-temperature ferroelectricity in SrTiO3 membranes
Not Available
Intercalation-type catalyst for non-aqueous room temperature sodium-sulfur batteries
Abstract Ambient-temperature sodium-sulfur (Na-S) batteries are potential attractive alternatives to lithium-ion batteries owing to their high theoretical specific energy of 1,274 Wh kg −1 based on the mass of Na 2 S and abundant sulfur resources. However, their practical viability is impeded by sodium polysulfide shuttling. Here, we report an intercalation-conversion hybrid positive electrode material by coupling the intercalation-type catalyst, MoTe 2 , with the conversion-type active material, sulfur. In addition, MoTe 2 nanosheets vertically grown on graphene flakes offer abundant active catalytic sites, further boosting the catalytic activity for sulfur redox. When used as a composite positive electrode and assembled in a coin cell with excess Na, a discharge capacity of 1,081 mA h g s −1 based on the mass of S with a capacity fade rate of 0.05% per cycle over 350 cycles at 0.1 C rate in a voltage range of 0.8 to 2.8 V is realized under a high sulfur loading of 3.5 mg cm −2 and a lean electrolyte condition with an electrolyte-to-sulfur ratio of 7 μL mg −1 . A fundamental understanding of the electrocatalysis of MoTe 2 is further revealed by in-situ synchrotron-based operando X-ray diffraction and ex-situ time-of-flight secondary ion mass spectrometry.
Optically accessible long-lived electronic biexcitons at room temperature in strongly coupled H- aggregates
Not provided.
Non-volatile Fermi level tuning for the control of spin-charge conversion at room temperature
Not provided.
Room-temperature heterodyne terahertz detection with quantum-level sensitivity
Not provided.
Radiative control of dark excitons at room temperature by nano-optical antenna-tip Purcell effect
Not provided.
Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates
Not provided.
Imaging strain-localized excitons in nanoscale bubbles of monolayer WSe2 at room temperature
Not provided.