ORCID Profile
0000-0002-4403-737X
Current Organisation
Dalian Institute of Chemical Physics
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Publisher: AIP Publishing
Date: 02-11-2011
DOI: 10.1063/1.3660322
Abstract: We report the fabrication and characterizations of oxide heterojunctions composed of TbMnO3 thin films grown on conducting Nb:SrTiO3 substrates. The heterojunctions exhibit rich rectifying characteristics, depending on not only the measurement temperature but also the growth temperature: at 300 K, good rectification appears in both s les at lower temperatures, the rectification is much smaller in the s le grown at 700 °C, whereas it exhibits a reversed bias dependence and reaches ∼5000 in the s le grown at 780 °C. Regarding to the transport mechanism, the conduction appears to be Schottky-emission-like at high temperatures in both junctions, indicating well-defined band alignment at interface on the other hand, the space-charge-limited mechanism dictates the low temperature transport. Furthermore, the temperature and frequency dependent capacitance-loss data suggest that the transport dynamics is associated with multiple thermally activated relaxation processes. Finally, transmission electron microscopy studies shed light on the crystalline quality of the junction interfaces, which is believed to dictate the corresponding transport properties.
Publisher: American Chemical Society (ACS)
Date: 04-05-2021
Publisher: Springer Science and Business Media LLC
Date: 09-03-2020
DOI: 10.1038/S41467-020-14984-9
Abstract: Single-atom catalysts (SACs) have demonstrated superior catalytic performance in numerous heterogeneous reactions. However, producing thermally stable SACs, especially in a simple and scalable way, remains a formidable challenge. Here, we report the synthesis of Ru SACs from commercial RuO 2 powders by physical mixing of sub-micron RuO 2 aggregates with a MgAl 1.2 Fe 0.8 O 4 spinel. Atomically dispersed Ru is confirmed by aberration-corrected scanning transmission electron microscopy and X-ray absorption spectroscopy. Detailed studies reveal that the dispersion process does not arise from a gas atom trapping mechanism, but rather from anti-Ostwald ripening promoted by a strong covalent metal-support interaction. This synthetic strategy is simple and amenable to the large-scale manufacture of thermally stable SACs for industrial applications.
Publisher: American Chemical Society (ACS)
Date: 10-06-2011
DOI: 10.1021/NL2015747
Abstract: ZnS nanotetrapods were investigated by atom-resolved microscopy characterization and quantitative simulation. The octahedron core enclosed with Zn- and S-terminated surfaces was verified. Four hexaprism-shaped arms were selectively grown from Zn-terminated surfaces of the core by alternately stacking zinc blende and wurtzite structures. The stacking order change at the core/arm interface is significant to activate the arm growth. The anisotropic growth mechanism was proposed and further proved by the synthesis of ZnS nanoparticles and nanobelts.
Publisher: SAGE Publications
Date: 06-12-2011
Abstract: There has been an increasing concern on indoor air quality in recent years due to the possible harmful effects to human health. Indoor air pollution as a result of using natural gas for cooking and heating is a common health threat, particularly for women and young children. Therefore, quantification of the type and emission levels of these pollutants is necessary in order to mitigate and monitor the emissions. Computational fluid dynamics (CFDs) can be used to model airflow and dispersion within buildings of complex geometry and layout. In the present paper, a CFD analysis is performed to determine the concentration of indoor air quality for a typical one-floor building in order to determine the optimal locations of monitoring sensors. According to this study, placing the monitoring sensors based on the maximum concentrations of the in idual contaminant does not entirely overcome the problems, as the concentrations of different hazardous pollutants cannot be added. Moreover, high concentration with low duration of exposure is not a good candidate for placing the monitoring system. A risk-based methodology is proposed to determine the optimal location for the monitoring systems. Different risk management strategies are also considered as a part of the methodology to reduce the exposure risk of indoor contaminants.
Location: China
No related grants have been discovered for Wei Liu.