A combinatorial chemical beam vapour deposition approach to tune the electrical conductivity of Nb:TiO2 films via Si co-doping

2016 ◽  
Vol 615 ◽  
pp. 265-270 ◽  
Author(s):  
C.S. Sandu ◽  
E. Wagner ◽  
S. Harada ◽  
G. Benvenuti ◽  
W. Maudez ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Vapour Deposition ◽  
Co Doping

scholarly journals In Situ Doping of Nitrogen in -Oriented Bulk 3C-SiC by Halide Laser Chemical Vapour Deposition

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 410
Author(s):  
Youfeng Lai ◽  
Lixue Xia ◽  
Qingfang Xu ◽  
Qizhong Li ◽  
Kai Liu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Chemical Vapour Deposition ◽  
High Speed ◽  
Vapour Deposition ◽  
Volume Fraction ◽  
Chemical Vapour ◽  
Optical Transmittance ◽  
Undoped Sample ◽  
Maximum Value

Doping of nitrogen is a promising approach to improve the electrical conductivity of 3C-SiC and allow its application in various fields. N-doped, <110>-oriented 3C-SiC bulks with different doping concentrations were prepared via halide laser chemical vapour deposition (HLCVD) using tetrachlorosilane (SiCl4) and methane (CH4) as precursors, along with nitrogen (N2) as a dopant. We investigated the effect of the volume fraction of nitrogen (ϕN2) on the preferred orientation, microstructure, electrical conductivity (σ), deposition rate (Rdep), and optical transmittance. The preference of 3C-SiC for the <110> orientation increased with increasing ϕN2. The σ value of the N-doped 3C-SiC bulk substrates first increased and then decreased with increasing ϕN2, reaching a maximum value of 7.4 × 102 S/m at ϕN2 = 20%. Rdep showed its highest value (3000 μm/h) for the undoped sample and decreased with increasing ϕN2, reaching 1437 μm/h at ϕN2 = 30%. The transmittance of the N-doped 3C-SiC bulks decreased with ϕN2 and showed a declining trend at wavelengths longer than 1000 nm. Compared with the previously prepared <111>-oriented N-doped 3C-SiC, the high-speed preparation of <110>-oriented N-doped 3C-SiC bulks further broadens its application field.

scholarly journals Submicrometric Fibrillar Structures of Codoped Polyaniline Obtained by Co-oxidation Using the NaClO/Ammonium Peroxydisulfate System: Synthesis and Characterization

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Jorge Enrique Osorio-Fuente ◽  
Carlos Gómez-Yáñez ◽  
María De los Ángeles Hernández-Pérez ◽  
Mónica De la Luz Corea-Téllez
Keyword(s):  
Electrical Conductivity ◽  
Co Oxidation ◽  
Sodium Hypochlorite ◽  
Polymerization Rate ◽  
Synthesis And Characterization ◽  
Aromatic Rings ◽  
Co Doping ◽  
Ammonium Peroxydisulfate ◽  
Structure Morphology ◽  
Morphology Changes

A mixture of ammonium peroxydisulfate and sodium hypochlorite (NaClO) (co-oxidating system) were used to obtain polyaniline (PANi) doped with HCl and camphorsulfonic acid (CSA) (co-doping). The effect of HCl/CSA ratio added during polymerization on structure, morphology and electrical conductivity of the conducting polymer was investigated. When NaClO is used, the polymerization rate is substantially increased and the morphology changes from micrometric granular to nanometric fibrillar. CSA was used as complementary dopant but also to improve the solubility of PANi in common solvents. However, results suggest that quinone-like heterocycles containing carbonyl radicals as well as phenazine-type aromatic rings might be impeding an efficient doping in detriment of the conductivity.

Effects of Yttria and Calcia Co-Doping on the Electrical Conductivity of Zirconia Ceramics

2007 ◽  
Vol 44 (12) ◽  
pp. 655-659 ◽  
Author(s):  
Jong-Sook Lee ◽  
Dong-Kyu Shin ◽  
Byung-Yun Choi ◽  
Jung-Kwang Jeon ◽  
Sung-Hwan Jin ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Zirconia Ceramics ◽  
Co Doping

scholarly journals Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms

2017 ◽  
Author(s):  
Mi-Kyung Han ◽  
Yingshi Jin ◽  
Da-Hee Lee ◽  
Sung-Jin Kim
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Carrier Concentration ◽  
Thermoelectric Properties ◽  
Thermal Transport ◽  
Co Doping ◽  
Thermal Transport Properties ◽  
Co Doped

In order to understand the effect of Pb-CuI co-doping on the thermoelectric performance of Bi2Te3, n-type Bi2Te3 co-doped with x at% CuI and 1/2x at% Pb (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.10) were prepared via high temperature solid state reaction and consolidated using spark plasma sintering. Electron and thermal transport properties, i.e., electrical conductivity, carrier concentration, Hall mobility, Seebeck coefficient, and thermal conductivity, of CuI-Pb co-doped Bi2Te3 were measured in the temperature range from 300 K to 523 K and compared to corresponding x% of CuI-doped Bi2Te3 and undoped Bi2Te3. The addition of a small amount of Pb significantly decreased the carrier concentration, which could be attributed to the holes from Pb atoms, thus the CuI-Pb co-doped samples show a lower electrical conductivity and a higher Seebeck coefficient compared to CuI-doped samples with similar x values. The incorporation of Pb into CuI-doped Bi2Te3 rarely changed the power factor because of the trade-off relationship between the electrical conductivity and the Seebeck coefficient. The total thermal conductivity(&kappa;tot) of co-doped samples (&kappa;tot ~1.4 W/m∙K at 300 K) is slightly lower than that of 1% CuI-doped Bi2Te3 (&kappa;tot~1.5 W/m∙K at 300 K) and undoped Bi2Te3 (&kappa;tot ~1.6 W/m∙K at 300 K) due to the alloy scattering. The 1% CuI-Pb co-doped Bi2Te3 sample shows the highest ZT value of 0.96 at 370 K. All data on electrical and thermal transport properties suggest that the thermoelectric properties of Bi2Te3 and its operating temperature can be controlled by co-doping.

Electrical conductivity of Co3O4 films prepared by chemical vapour deposition

1998 ◽  
Vol 53 (3) ◽  
pp. 225-230 ◽  
Author(s):  
Chun-Shen Cheng ◽  
M. Serizawa ◽  
H. Sakata ◽  
T. Hirayama
Keyword(s):  
Electrical Conductivity ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour

Significant Influences of Co-Doping Ag and Sb on Electrical Properties and Thermoelectric Applications of AgPbmSbTem+2 Compounds Synthesized Using Solid State Microwave Technique

2015 ◽  
Vol 819 ◽  
pp. 193-197 ◽  
Author(s):  
Arshad Hmood ◽  
Arej Kadhim ◽  
H.A. Hassan
Keyword(s):  
Electrical Conductivity ◽  
Solid State ◽  
Seebeck Coefficient ◽  
Lead Telluride ◽  
Thermoelectric Power Factor ◽  
Microwave Technique ◽  
Co Doping ◽  
Thermoelectric Measurements ◽  
Simultaneous Doping

In this paper we reported the electrical conductivity and thermoelectric characterization of silver (Ag) and antimony (Sb) co-doped lead telluride bulk materials, which have been synthesized using solid state microwave technique. The doping level has performed first-principle calculations for the AgPbmSbTem+2 (LAST-m) (m = 0, 2, 4, 6, 8 and 10) to clarify the effect of simultaneous doping of Ag and Sb on PbTe. The Hall effect and thermoelectric measurements have shown n-type conductivity in AgPbmSbTem+2 samples. The samples show large and negative values of the Seebeck coefficient and moderate electrical conductivity. The Seebeck coefficient increased with doping levels increases at m=0 to 10. The value of the Seebeck coefficient is −419.69 μVK−1 for AgPb8SbTe10 at 338 K. It has been found that AgPb8SbTe10 sample has a higher thermoelectric power factor 1.87 mW K-2 m-1 at 310 K.

Three-dimensional porous stretchable and conductive polymer composites based on graphene networks grown by chemical vapour deposition and PEDOT:PSS coating

2015 ◽  
Vol 51 (15) ◽  
pp. 3169-3172 ◽  
Author(s):  
Mengting Chen ◽  
Shasha Duan ◽  
Ling Zhang ◽  
Zhihui Wang ◽  
Chunzhong Li
Keyword(s):  
Electrical Conductivity ◽  
Polymer Composites ◽  
Vapour Deposition ◽  
Conductive Polymer ◽  
Three Dimensional ◽  
Chemical Vapour ◽  
Electrical Performance ◽  
Retention Capacity ◽  
Cvd Graphene ◽  
Conductive Polymer Composites

The porous CVD graphene–PEDOT:PSS–PDMS composite has outstanding electrical performance, including higher electrical conductivity and better resistance retention capacity than the CVD graphene–PDMS composite.

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