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      A Novel Highly Sensitive NO 2 Sensor Based on Perovskite Na 0.5+xBi 0.5TiO 3−δ Electrolyte

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          Abstract

          NO x is one of dangerous air pollutants, and the demands for reliable sensors to detect NO x are extremely urgent recently. Conventional fluorite-phase YSZ used for NO x sensor requires higher operating temperature to obtain desirable oxygen ion conductivity. In this work, perovskite-phase Na 0.5Bi 0.5TiO 3 (NBT) oxygen conductor was chosen as the solid electrolyte to fabricate a novel highly sensitive NO 2 sensor with CuO as the sensing electrode and Pt as reference electrode. Na dopped Na 0.5Bi 0.5TiO 3 greatly improved the sensing performance of this sensor. The optimal sensor based on Na 0.51Bi 0.50TiO 3−δ exhibited good response-recovery characteristics to NO 2 and the response current values were almost linear to NO 2 concentrations in the range of 50–500 ppm at 400–600 °C. The response current value towards NO 2 reached maximum 11.23 μA at 575 °C and the value on NO 2 is much higher than other gases (CH 4, C 2H 4, C 3H 6, C 3H 8, CO), indicating good selectivity for detecting NO 2. The response signals of the sensor were slightly affected by coexistent O 2 varying from 2 to 21 vol% at 575 °C. The response current value decreased only 4.9% over 2 months, exhibiting the potential application in motor vehicles.

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          Transport properties of two finite armchair graphene nanoribbons

          In this work, we present a theoretical study of the transport properties of two finite and parallel armchair graphene nanoribbons connected to two semi-infinite leads of the same material. Using a single Π-band tight binding Hamiltonian and based on Green’s function formalisms within a real space renormalization techniques, we have calculated the density of states and the conductance of these systems considering the effects of the geometric confinement and the presence of a uniform magnetic field applied perpendicularly to the heterostructure. Our results exhibit a resonant tunneling behaviour and periodic modulations of the transport properties as a function of the geometry of the considered conductors and as a function of the magnetic flux that crosses the heterostructure. We have observed Aharonov-Bohm type of interference representing by periodic metal-semiconductor transitions in the DOS and conductance curves of the nanostructures.
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            A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3.

            Oxide ion conductors find important technical applications in electrochemical devices such as solid-oxide fuel cells (SOFCs), oxygen separation membranes and sensors. Na0.5Bi0.5TiO3 (NBT) is a well-known lead-free piezoelectric material; however, it is often reported to possess high leakage conductivity that is problematic for its piezo- and ferroelectric applications. Here we report this high leakage to be oxide ion conduction due to Bi-deficiency and oxygen vacancies induced during materials processing. Mg-doping on the Ti-site increases the ionic conductivity to ~0.01 S cm(-1) at 600 °C, improves the electrolyte stability in reducing atmospheres and lowers the sintering temperature. This study not only demonstrates how to adjust the nominal NBT composition for dielectric-based applications, but also, more importantly, gives NBT-based materials an unexpected role as a completely new family of oxide ion conductors with potential applications in intermediate-temperature SOFCs and opens up a new direction to design oxide ion conductors in perovskite oxides.
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              Bismuth based oxide electrolytes— structure and ionic conductivity

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                Author and article information

                Contributors
                zhongfulan@fzu.edu.cn
                jll@fzu.edu.cn
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                10 July 2017
                10 July 2017
                2017
                : 7
                : 4997
                Affiliations
                [1 ]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No. 523, Fuzhou 350002, Fujian, P. R. China
                [2 ]ISNI 0000 0000 9271 2478, GRID grid.411503.2, College of Chemistry and Materials Science, , Fujian Normal University, ; Fuzhou, China
                Article
                5169
                10.1038/s41598-017-05169-4
                5504058
                28694507
                22efd684-7e1d-47c7-9a2d-f0f1c459660f
                © The Author(s) 2017

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 7 February 2017
                : 24 May 2017
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