Tuning the electronic properties of bondings in monolayer MoS2 through (Au, O) co-doping

RSC Advances ◽  
2015 ◽  
Vol 5 (83) ◽  
pp. 68085-68091 ◽  
Author(s):  
Jie Su ◽  
Yan Zhang ◽  
Yang Hu ◽  
Li-ping Feng ◽  
Zheng-tang Liu
Keyword(s):  
Electronic Properties ◽  
Monolayer Mos2 ◽  
Co Doping ◽  
Effect Of Oxygen ◽  
Co Doped

This paper studies the electronic properties of un-, Au-, (Au, O) co-doped monolayer MoS2 to analyze the effect of oxygen on the character of Au–S bonding, with the goal of improving the conductivity of Au–S bonding of MoS2-device with electrode Au.

Tuning the near-gap electronic structure of Cu2O by anion–cation co-doping for enhanced solar energy conversion

2017 ◽  
Vol 31 (01) ◽  
pp. 1650429 ◽  
Author(s):  
Yuan Si ◽  
Hao-Ming Yang ◽  
Hong-Yu Wu ◽  
Wei-Qing Huang ◽  
Ke Yang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Band Gap ◽  
Electronic Properties ◽  
Charge Compensation ◽  
First Principles Calculations ◽  
Electron Hole ◽  
Co Doping ◽  
Critical Elements ◽  
Specific Performance ◽  
Co Doped

Doping is an effective strategy to tune the electronic properties of semiconductors, but some side effects caused by mono-doping degrade the specific performance of matrixes. As a model system to minimize photoproduced electron-hole pairs recombination by anion–cation co-doping, we investigate the electronic structures and optical properties of (Fe[Formula: see text]+[Formula: see text]N) co-doped Cu2O using the first-principles calculations. Compared to the case of mono-doping, the Fe[Formula: see text]N[Formula: see text] (a Fe (N) atom substituting a Cu (O) atom) co-doping reduces the energy cost of doping as a consequence of the charge compensation between the iron and nitrogen impurities, which eliminates the isolated levels (induced by mono-dopant) in the band gap. Interestingly, it is found that the contributions of different host atoms (Cu and O) away from anion (N) and cation (Fe) dopants to the variation of near band gap electronic structure of the co-doped Cu2O are different. Moreover, co-doping reduces the band gap and increases the visible-light absorption of Cu2O. Both band gap reduction and low recombination rate are critical elements for efficient light-to-current conversion in co-doped semiconductor photocatalysts. These findings raise the prospect of using co-doped Cu2O with specifically engineered electronic properties in a variety of solar applications.

scholarly journals Optimizing the average power factor of p-type (Na, Ag) co-doped polycrystalline SnSe

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7115-7122 ◽  
Author(s):  
Si Wang ◽  
Xianli Su ◽  
Trevor P. Bailey ◽  
Tiezheng Hu ◽  
Zhengkai Zhang ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Power Factor ◽  
Average Power ◽  
Co Doping ◽  
P Type ◽  
Co Doped

(Na, Ag) co-doping combines the advantages of Ag and Na single doping in terms of the electronic properties.

Co-doping effect on the electronic properties of nonstoichiometric tin telluride

MRS Advances ◽  
2019 ◽  
Vol 4 (30) ◽  
pp. 1699-1707
Author(s):  
Dana Ben-Ayoun ◽  
Yaniv Gelbstein
Keyword(s):  
Band Structure ◽  
Electronic Properties ◽  
Conversion Efficiency ◽  
Doping Effect ◽  
High Conversion ◽  
High Conversion Efficiency ◽  
Co Doping ◽  
The Past ◽  
Tin Telluride ◽  
Co Doped

ABSTRACTThe search for nontoxic compositions in the thermoelectric field has motivated many researches to find alternatives to the toxic Pb-based systems, capable of reaching their high conversion efficiency. SnTe is gaining much attention during the past years due to its superior eco-friendly character, and its very similar crystal and band structure to that of PbTe. These makes SnTe a promising compound with great potential to answer the demand and use as a fair thermoelectric candidate. Most of the recently published studies mainly discuss the stoichiometric SnTe alloy. Only several focus on the effect of introducing excess tin/tellurium to the system. For that reason, this research aims to investigate in detail the nonstoichiometric SnxTe1-x co-doped by bismuth and indium/iodine, in an attempt to optimize the electronic properties.

scholarly journals First-principles study of atomic structure and electronic properties of Si and F doped anatase TiO2

2015 ◽  
Vol 33 (3) ◽  
pp. 549-554 ◽  
Author(s):  
Hongping Li ◽  
Lin Chen ◽  
Shuai Liu ◽  
Changsheng Li ◽  
Jian Meng ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Density Functional ◽  
Density Functional Theory Calculation ◽  
Chemical Doping ◽  
Geometrical Structures ◽  
Practical Applications ◽  
Co Doping ◽  
Si Doped ◽  
Theory Calculation ◽  
Co Doped

Abstract Chemical doping represents one of the most effective ways in engineering electronic structures of anatase TiO2 for practical applications. Here, we investigate formation energies, geometrical structures, and electronic properties of Si-, F-doped and Si/F co-doped anatase TiO2 by using spin-polarized density functional theory calculation. We find that the co-doped TiO2 is thermodynamically more favorable than the Si- and F-doped TiO2- Structural analysis shows that atomic impurity varies crystal constants slightly. Moreover, all the three doped systems show a pronounced narrowing of band gap by 0.33 eV for the F-doped TiO2, 0.17 eV for the Si-doped TiO2, and 0.28 eV for the Si/F-co-doped TiO2, which could account for the experimentally observed redshift of optical absorption edge. Our calculations suggest that the Si/F-co-doping represents an effective way in tailoring electronic structure and optical properties of anatase TiO2.

Promoting Hydrogen Evolution of g-C3N4 Based Photocatalyst by Indium and Phosphorus Co-doping

2021 ◽  
Author(s):  
Xiao-Hang Yang ◽  
Chi Cao ◽  
Zilong Guo ◽  
Xiaoyu Zhang ◽  
Yaxin Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Post Treatment ◽  
Experimental Results ◽  
Indium Chloride ◽  
Co Doping ◽  
In Situ Copolymerization ◽  
Co Doped

Indium and phosphorus co-doped g-C3N4 photocatalyst (In,P-g-C3N4) was prepared by K2HPO4 post-treatment of indium doped g-C3N4 photocatalyst (In-g-C3N4) derived from in-situ copolymerization of dicyandiamide and indium chloride. The experimental results...

scholarly journals Cobalt-doped bioceramic scaffolds fabricated by 3D printing show enhanced osteogenic and angiogenic properties for bone repair

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Jungang Li ◽  
Chaoqian Zhao ◽  
Chun Liu ◽  
Zhenyu Wang ◽  
Zeming Ling ◽  
...  
Keyword(s):  
Compressive Strength ◽  
3D Printing ◽  
Bone Regeneration ◽  
Doping Concentration ◽  
Artificial Bone ◽  
Bone Defect Repair ◽  
Co Doping ◽  
Defect Repair ◽  
Co Doped

Abstract Background The bone regeneration of artificial bone grafts is still in need of a breakthrough to improve the processes of bone defect repair. Artificial bone grafts should be modified to enable angiogenesis and thus improve osteogenesis. We have previously revealed that crystalline Ca10Li(PO4)7 (CLP) possesses higher compressive strength and better biocompatibility than that of pure beta-tricalcium phosphate (β-TCP). In this work, we explored the possibility of cobalt (Co), known for mimicking hypoxia, doped into CLP to promote osteogenesis and angiogenesis. Methods We designed and manufactured porous scaffolds by doping CLP with various concentrations of Co (0, 0.1, 0.25, 0.5, and 1 mol%) and using 3D printing techniques. The crystal phase, surface morphology, compressive strength, in vitro degradation, and mineralization properties of Co-doped and -undoped CLP scaffolds were investigated. Next, we investigated the biocompatibility and effects of Co-doped and -undoped samples on osteogenic and angiogenic properties in vitro and on bone regeneration in rat cranium defects. Results With increasing Co-doping level, the compressive strength of Co-doped CLP scaffolds decreased in comparison with that of undoped CLP scaffolds, especially when the Co-doping concentration increased to 1 mol%. Co-doped CLP scaffolds possessed excellent degradation properties compared with those of undoped CLP scaffolds. The (0.1, 0.25, 0.5 mol%) Co-doped CLP scaffolds had mineralization properties similar to those of undoped CLP scaffolds, whereas the 1 mol% Co-doped CLP scaffolds shown no mineralization changes. Furthermore, compared with undoped scaffolds, Co-doped CLP scaffolds possessed excellent biocompatibility and prominent osteogenic and angiogenic properties in vitro, notably when the doping concentration was 0.25 mol%. After 8 weeks of implantation, 0.25 mol% Co-doped scaffolds had markedly enhanced bone regeneration at the defect site compared with that of the undoped scaffold. Conclusion In summary, CLP doped with 0.25 mol% Co2+ ions is a prospective method to enhance osteogenic and angiogenic properties, thus promoting bone regeneration in bone defect repair.

Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films

2021 ◽  
Vol 23 (3) ◽  
pp. 2368-2376
Author(s):  
A. Di Trolio ◽  
A. Amore Bonapasta ◽  
C. Barone ◽  
A. Leo ◽  
G. Carapella ◽  
...  
Keyword(s):  
Thin Films ◽  
Opposite Effect ◽  
Transport Mechanisms ◽  
Co Doping ◽  
Polycrystalline Thin Films ◽  
Doped Zno ◽  
Co Doped

Co doping increases the ZnO resistivity (ρ) at high T (HT), whereas it has an opposite effect at low T (LT). H balances the Co effects by neutralizing the ρ increase at HT and strengthening its decrease at LT.

Electronic properties of intrinsic vacancies in single-layer CaF2 and its heterostructure with monolayer MoS2

2021 ◽  
Vol 130 (5) ◽  
pp. 055301
Author(s):  
Zhenzhen Li ◽  
Mehmet Baskurt ◽  
Hasan Sahin ◽  
Shiwu Gao ◽  
Jun Kang
Keyword(s):  
Electronic Properties ◽  
Single Layer ◽  
Monolayer Mos2

scholarly journals Photo-activity and low resistivity in N/Nb Co-doped TiO2 thin films by combinatorial AACVD

2016 ◽  
Vol 4 (2) ◽  
pp. 407-415 ◽  
Author(s):  
Nicholas P. Chadwick ◽  
Emily N. K. Glover ◽  
Sanjayan Sathasivam ◽  
Sulaiman N. Basahel ◽  
Shaeel A. Althabaiti ◽  
...  
Keyword(s):  
Thin Films ◽  
Functional Properties ◽  
Tio2 Thin Films ◽  
Doped Tio2 ◽  
Low Resistivity ◽  
Co Doping ◽  
Co Doped

Combinatorial AACVD has achieved the production of various niobium/nitrogen co-doped TiO2 materials in a single film. The co-doping concentrations have been correlated with functional properties.

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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