Analysis of the Thermal Degradation Effect on a HfO2-Based Memristor Synapse Caused by Oxygen Affinity of a Top Electrode Metal and on a Neuromorphic System

Investigation of Resistive Switching at SrRuO3/Cr-doped SrZrO3/Metal Junctions

MRS Proceedings ◽

10.1557/proc-0997-i04-04 ◽

2007 ◽

Vol 997 ◽

Author(s):

Hwan-Soo Lee

Keyword(s):

Oxide Film ◽

Charge Transport ◽

Resistive Switching ◽

Electrical Contact ◽

Oxygen Affinity ◽

Charge Carriers ◽

Perovskite Oxide ◽

Measured Resistance ◽

Electrode Metal ◽

Limited Conduction

AbstractWe have investigated charge transport properties with current perpendicular to the plane across the interface between a Cr-doped SrZrO3 perovskite oxide film and different top electrode metals. The measured resistance showed a wide variation depending on the top electrode metal, and suggested the interfacial properties with respect to contacting electrode metal kinds are responsible for the change in I-V characteristics (IVCs). The observed I-V curves were modeled with the equation I(V) = aV+bV2, where the variation of a was related to the work function of the metal whereas the variation of b was related to the oxygen affinity of the metal, consistent with space charge limited conduction through a defected interface. Additionally, the resistive switching was attributed to a change in both the a and the b coefficients. We speculate that voltage (or current) induced vacancy motion can account for a change in trap density in the oxide near the metallic electrical contact, and thus trapping or detrapping of charge carriers, showing the conductivity modulation across the junction.

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Estimation of the radiant performance of flame-retardant fabrics considering thermal degradation effect

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925019843615 ◽

2019 ◽

Vol 14 ◽

pp. 155892501984361

Author(s):

Qianqian Feng ◽

FL Zhu ◽

Jianfeng Hu

Keyword(s):

Thermal Degradation ◽

Radiative Properties ◽

Limit Oxygen Index ◽

Transfer Mode ◽

Virgin State ◽

Thermal Protective Clothing ◽

Protective Fabrics ◽

Protective Performance ◽

Degradation Effect ◽

Intense Heat

Specially designed thermal protective clothing is used by firefighters and furnace operators for safety against intense heat flux exposures. Radiative transfer becomes the main heat transfer mode under such high temperature conditions. This work dealt with the effects of thermal degradation on the radiant protective performance and radiative properties of Polysulfonamide and Nomex IIIA fabrics at virgin state and pyrolyzed state, respectively. Simultaneously, the thermal stability and flame retardancy of both fabrics were compared by using thermogravimetry, vertical burning test, and limit oxygen index methods. The obtained results of thermal degradation effect on radiative properties demonstrated that both of the reflectance and transmittance of the two kinds of fabrics at virgin condition are higher than those at pyrolyzed state. On the other hand, the radiant protective performance values of both fabrics at charred condition were lower as compared to those at virgin state. This study will be helpful to estimate the continuing performance of firefighters’ protective fabrics after thermal exposures during firefighting operations.

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