Band gap engineering of MnO2 through in situ Al-doping for applicable pseudocapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 13914-13919 ◽  
Author(s):  
Tianqi Li ◽  
Jiabin Wu ◽  
Xu Xiao ◽  
Bingyan Zhang ◽  
Zhimi Hu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Band Gap ◽  
Chemical Activity ◽  
High Electrical Conductivity ◽  
Al Doping ◽  
Band Gap Engineering

Band gap engineering was achieved by in situ doping method for high electrical conductivity and chemical activity of MnO2.

New oxide phase Cd1−xYxSb2O6with a wide band gap and high electrical conductivity

1993 ◽  
Vol 63 (24) ◽  
pp. 3335-3337 ◽  
Author(s):  
Kazuhiko Yanagawa ◽  
Yoshimichi Ohki ◽  
Naoyuki Ueda ◽  
Takahisa Omata ◽  
Takuya Hashimoto ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Band Gap ◽  
Wide Band ◽  
Oxide Phase ◽  
High Electrical Conductivity ◽  
Wide Band Gap

New Oxide Phase $\bf Cd_{2(1-{\ninmbi x})}Y_{2{\ninmbi x}}Sb_{2}O_{7}$ Pyrochlore with a Wide Band Gap and High Electrical Conductivity

1994 ◽  
Vol 33 (Part 2, No. 2B) ◽  
pp. L238-L240 ◽  
Author(s):  
Kazuhiko Yanagawa ◽  
Yoshimichi Ohki ◽  
Takahisa Omata ◽  
Hideo Hosono ◽  
Naoyuki Ueda ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Band Gap ◽  
Wide Band ◽  
Oxide Phase ◽  
High Electrical Conductivity ◽  
Wide Band Gap

Fabrication and Thermoelectric Properties of Al-Doped (ZnO)5In2O3 by Microwave Heating

2013 ◽  
Vol 761 ◽  
pp. 27-31 ◽  
Author(s):  
Tomoyuki Endo ◽  
Yamato Hayashi ◽  
Jun Fukushima ◽  
Hirotsugu Takizawa
Keyword(s):  
Electrical Conductivity ◽  
Microwave Heating ◽  
The Other ◽  
Conventional Heating ◽  
High Electrical Conductivity ◽  
Templated Grain Growth ◽  
Al Doping ◽  
Xrd Pattern ◽  
Doped Zno ◽  
Absolute Seebeck Coefficient

Various (ZnO)5In2O3ceramics were fabricated by microwave heating. Density, XRD pattern and microstructure were examined and those of Al-doped (ZnO)5In2O3were almost the same as Al-free one. Highly textured (ZnO)5In2O3ceramic was also fabricated by reactive templated grain growth (RTGG) method. The electrical conductivity was not improved by Al-doping; however it was improved slightly by microwave heating compared with conventional heating and especially improved by texturing using RTGG method. On the other hand, the absolute Seebeck coefficient in microwave heating was improved about 25% by Al-doped. Maximum electric power factor of textured specimen fabricated by RTGG method along ab-plane showed 5.76×10-4WK-2m-1(at 873K), which was attributed to high electrical conductivity.

Pulsed Laser-Induced Crystallization and Amorphization of SiGe Films.

1992 ◽  
Vol 258 ◽  
Author(s):  
T. Sameshima ◽  
S. Usui
Keyword(s):  
Electrical Conductivity ◽  
Band Gap ◽  
Silicon Germanium ◽  
Carrier Mobility ◽  
Pulsed Laser ◽  
Nucleation Density ◽  
High Electrical Conductivity ◽  
Germanium Alloy ◽  
Si Films ◽  
Induced Crystallization

ABSTRACTPulsed laser-induced melting followed by crystallization and amorphization were studied on silicon-germanium alloy (SiGe) films. Although amorphization was achieved on SiGe films, it was not observed in pure Ge films. Crystalline nucleation density in homogeneous solidification increased as Ge concentration increased. It was 1×1024m-3for Si0.22Ge0.78 films, while it was 4×1022m-3 for pUre si films. Electrical conductivity of laser polycrystallized films increased as Ge concentration increased. It had a maximum of 1 S/cm when Ge concentration was 0.78. This high electrical conductivity would be brought about by the increase of carrier mobility as well as the reduction of the band gap.

Well-Defined Blackberry-Like Polypyrrole Microspheres via Chemical Oxidative Polymerization in the Presence of Functional Floating Bead as In Situ Dopant

2014 ◽  
Vol 904 ◽  
pp. 159-163 ◽  
Author(s):  
Jia Ping Lao ◽  
Chao Yang ◽  
Hao Dao Mo ◽  
Yu Ping Li ◽  
Li Min Zang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Sulfonic Acid ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
High Electrical Conductivity ◽  
Chemical Oxidative Polymerization ◽  
Inorganic Substrate ◽  
Thermal Stability Of

Functional floating bead (F-FB), prepared by anchoring the organic sulfonic acid on the surface of the blackberry-like structural FB, was used as both the inorganic substrate and the in situ dopant for the in situ chemical oxidative polymerization of pyrrole to obtain the plypyrrole/functional floating bead (PPy/F-FB) nanocomposite material. The composites possess high electrical conductivity at room temperature. Thermogravimetric analysis shows that the thermal stability of PPy/F-FB composites was enhanced and these can be attributed to the retardation effect of sulfonic acid-functionalized FB as barriers for the degradation of PPy. The morphology of PPy/FB composites showed the well-defined blackberry-like morphology.

scholarly journals Evidence of the Intercalative Redox Polymerization of Ehylenedioxythiophene intoV2O5; Achievement of Highly Conducting Poly(3,4-Ethylenedioxythiophene)/V2O5Nanohybrids

2004 ◽  
Vol 27 (4) ◽  
pp. 229-236 ◽  
Author(s):  
A. V. Murugan ◽  
C. W. Kwon ◽  
S. J. Hwang ◽  
M. H. Delville ◽  
J. Portier ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
In Situ Polymerization ◽  
High Electrical Conductivity ◽  
Redox Polymerization ◽  
Novel Method

We have established a novel method of inserting poly(3,4-ethylenedioxythiophene) (PEDOT) between the layers ofV2O5using a soft process of intercalation. The reaction takes place with the in situ polymerization of EDOT within the framework of crystallineV2O5with different nominal EDOT/V2O5ratios. The hybrids PEDOT/V2O5exhibit a high electrical conductivity

Wide-Range Band-Gap Tuning and High Electrical Conductivity in La- and Pb-Doped SrSnO3 Epitaxial Films

2019 ◽  
Vol 11 (28) ◽  
pp. 25605-25612 ◽  
Author(s):  
Qiang Gao ◽  
Kaifeng Li ◽  
Li Zhao ◽  
Kaiyin Zhang ◽  
Hong Li ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Band Gap ◽  
Epitaxial Films ◽  
High Electrical Conductivity ◽  
Wide Range ◽  
Band Gap Tuning

scholarly journals A Nanocellulose Polypyrrole Composite Based on Tunicate Cellulose

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Dawei Zhang ◽  
Qing Zhang ◽  
Xin Gao ◽  
Guangzhe Piao
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Ammonium Persulfate ◽  
High Electrical Conductivity ◽  
Chemical Polymerization ◽  
Transmission Electron ◽  
Mean Size ◽  
Polypyrrole Composite ◽  
Scanning Electron

The water-dispersed conductive polypyrrole (PPy) was prepared via thein situoxidative chemical polymerization by using ammonium persulfate (APS) as oxidant and tunicate cellulose nanocrystals (T-CNs) as a dopant and template for tuning the morphologies of PPy nanoparticles. Highly flexible paper-like materials of PPy/T-CNs nanocomposites with high electrical conductivity values and good mechanical properties were prepared. The structure of nanocomposites of PPy/T-CNs was investigated by using Fourier transform infrared spectroscopy. Scanning electron microscopy and transmission electron microscopy analyses of the composites revealed that PPy consisted of nanoparticles about 2.5 nm in mean size to form a continuous coating covered on the T-CNs. The diameters of the PPy nanoparticles increased from 10 to 100 nm with the increasing pyrrole amount. Moreover, electrical properties of the obtained PPy/T-CNs films were studied using standard four-probe technique and the electrical conductivity could be as high as 10−3 S/cm.

scholarly journals Insights on the deep carbon cycle from the electrical conductivity of carbon-bearing aqueous fluids

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Geeth Manthilake ◽  
Mainak Mookherjee ◽  
Nobuyoshi Miyajima
Keyword(s):  
Electrical Conductivity ◽  
Subduction Zones ◽  
High Pressures ◽  
High Electrical Conductivity ◽  
Conductivity Measurements ◽  
Forming Mechanism ◽  
Geophysical Processes ◽  
High Pressures And Temperatures ◽  
Subducting Slab

AbstractThe dehydration and decarbonation in the subducting slab are intricately related and the knowledge of the physical properties of the resulting C–H–O fluid is crucial to interpret the petrological, geochemical, and geophysical processes associated with subduction zones. In this study, we investigate the C–H–O fluid released during the progressive devolatilization of carbonate-bearing serpentine-polymorph chrysotile, with in situ electrical conductivity measurements at high pressures and temperatures. The C–H–O fluid produced by carbonated chrysotile exhibits high electrical conductivity compared to carbon-free aqueous fluids and can be an excellent indicator of the migration of carbon in subduction zones. The crystallization of diamond and graphite indicates that the oxidized C–H–O fluids are responsible for the recycling of carbon in the wedge mantle. The carbonate and chrysotile bearing assemblages stabilize dolomite during the devolatilization process. This unique dolomite forming mechanism in chrysotile in subduction slabs may facilitate the transport of carbon into the deep mantle.

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