Scalable synthesis of SnS2/S-doped graphene composites for superior Li/Na-ion batteries

Nanoscale ◽  
2017 ◽  
Vol 9 (39) ◽  
pp. 14820-14825 ◽  
Author(s):  
Penglun Zheng ◽  
Zhengfei Dai ◽  
Yu Zhang ◽  
Khang Ngoc Dinh ◽  
Yun Zheng ◽  
...  
Keyword(s):  
Large Scale ◽  
Regeneration Strategy ◽  
Doped Graphene ◽  
Scalable Synthesis

A facile dissolution–regeneration strategy is proposed to construct large-scale flexible SnS2/sulfur-doped graphene composites as anodes for LIBs and SIBs.

scholarly journals Tuneable Resonance Properties of Graphene by Nitrogen-Dopant

2014 ◽  
Vol 553 ◽  
pp. 3-9 ◽  
Author(s):  
Hai Fei Zhan ◽  
Ye Wei ◽  
Yuan Tong Gu
Keyword(s):  
Natural Frequency ◽  
Large Scale ◽  
Dynamics Simulation ◽  
Pristine Graphene ◽  
External Energy ◽  
Resonance Properties ◽  
Doped Graphene ◽  
Bond Order Potential ◽  
Perfect Graphene ◽  
Pyridinic N

Doping as one of the popular methods to manipulate the properties of nanomaterials has received extensive application in deriving different types of graphene derivates, while the understanding of the resonance properties of dopant graphene is still lacking in literature. Based on the large-scale molecular dynamics simulation, reactive empirical bond order potential, as well as the tersoff potential, the resonance properties of N-doped graphene were studied. The studied samples were established according to previous experiments with the N atom’s percentage ranging from 0.38%-2.93%, including three types of N dopant locations, i.e., graphitic N, pyrrolic N and pyridinic N. It is found that different percentages of N-dopant exert different influence to the resonance properties of the graphene, while the amount of N-dopant is not the only factor that determines its impact. For all the considered cases, a relative large percentage of N-dopant (2.65% graphitic N-dopant) is observed to introduce significant influence to the profile of the external energy, and thus lead to an extremely low Q-factor comparing with that of the pristine graphene. The most striking finding is that the natural frequency of the defective graphene with N-dopant’s percentage higher than 0.89% appears larger than its pristine counterpart. For the perfect graphene, the N-dopant shows larger influence to its natural frequency. This study will enrich the current understanding of the influence of dopants on graphene, which will eventually shed lights on the design of different molecules-doped graphene sheet.

Scalable synthesis of self-assembled bimetallic phosphide/N-doped graphene nanoflakes as an efficient electrocatalyst for overall water splitting

Nanoscale ◽  
2019 ◽  
Vol 11 (27) ◽  
pp. 12837-12845 ◽  
Author(s):  
Dongxu Yang ◽  
Wenqiang Hou ◽  
Yingjiong Lu ◽  
Wanli Zhang ◽  
Yuanfu Chen
Keyword(s):  
Water Splitting ◽  
High Efficiency ◽  
Graphene Nanoflakes ◽  
Overall Water Splitting ◽  
Doped Graphene ◽  
Self Assembled ◽  
Scalable Synthesis

A bimetallic phosphide electrocatalyst is synthesized through a scalable approach, showing high efficiency in the HER, OER and overall water splitting.

Towards scalable synthesis of high-quality PbS colloidal quantum dots for photovoltaic applications

2019 ◽  
Vol 7 (6) ◽  
pp. 1575-1583 ◽  
Author(s):  
Sijie Zhou ◽  
Zeke Liu ◽  
Yongjie Wang ◽  
Kunyuan Lu ◽  
Fan Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Colloidal Quantum Dots ◽  
High Yield ◽  
High Quality ◽  
Excellent Quality ◽  
Photovoltaic Applications ◽  
Photovoltaic Technology ◽  
Scalable Synthesis ◽  
Large Scale Manufacture

Accelerating inorganic nanocrystal-based photovoltaic technology needs more efficient synthetic protocols for large scale manufacture, high yield and excellent quality nanocrystal materials.

scholarly journals High-performance monolayer MoS2 field-effect transistor with large-scale nitrogen-doped graphene electrodes for Ohmic contact

2019 ◽  
Vol 115 (1) ◽  
pp. 012104 ◽  
Author(s):  
Dongjea Seo ◽  
Dong Yun Lee ◽  
Junyoung Kwon ◽  
Jea Jung Lee ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Ohmic Contact ◽  
Field Effect ◽  
High Performance ◽  
Large Scale ◽  
Field Effect Transistor ◽  
Monolayer Mos2 ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Effect Transistor

A Scalable Synthesis of Biaryl Unit of the HIV Protease Inhibitor Atazanavir

2019 ◽  
Vol 17 (1) ◽  
pp. 68-72
Author(s):  
Chapala Vijayalakshmi ◽  
Malavattu G. Prasad ◽  
Naresh K. Katari ◽  
Pedavenkatagari N. Reddy
Keyword(s):  
Protease Inhibitor ◽  
Large Scale ◽  
Cyano Group ◽  
Cost Effective ◽  
Pharmacokinetic Profile ◽  
Hiv Protease ◽  
Tert Butyl ◽  
Palladium Catalyzed ◽  
Scalable Synthesis

Atazanavir is one of the most prescribed HIV-1 protease inhibitors approved by the FDA. It was the first protease inhibitor approved for once-a-day dosing to treat AIDS due to good oral bioavailability and favorable pharmacokinetic profile. This research aims to develop a new synthetic cost effective process for biaryl-hydrazine unit {tert-butyl 2-[4-(2-pyridinyl)benzyl]hydrazinecarboxylate} of atazanavir on a large scale. The synthesis involved palladium catalyzed Suzuki-Miyaura coupling of 2-chloropyridine and (4-cyanophenyl)boronic acid followed by DIBAL-H reduction of cyano group to aldehyde which is then treated with tert-butyl carbazate to furnish hydrazone subsequently in situ reduction with NaBH4. A large scale synthesis of biaryl-hydrazine unit of atazanavir was accomplished in three steps with 71% overall yield. We have developed a short and efficient synthesis of atazanavir key intermediate biaryl-hydrazine unit. The process does not require the usage of Grignard reagent, expensive catalyst, protection/deprotection of aldehyde moiety and catalytic hydrogenation.

scholarly journals Characterization of nitrogen doped graphene bilayers synthesized by fast, low temperature microwave plasma-enhanced chemical vapour deposition

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
C. R. S. V. Boas ◽  
B. Focassio ◽  
E. Marinho ◽  
D. G. Larrude ◽  
M. C. Salvadori ◽  
...  
Keyword(s):  
Large Scale ◽  
Microwave Plasma ◽  
Chemical Vapour ◽  
Chemical Vapor ◽  
Single Step ◽  
New Device ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Physical Phenomena

Abstract New techniques to manipulate the electronic properties of few layer 2D materials, unveiling new physical phenomena as well as possibilities for new device applications have brought renewed interest to these systems. Therefore, the quest for reproducible methods for the large scale synthesis, as well as the manipulation, characterization and deeper understanding of these structures is a very active field of research. We here report the production of nitrogen doped bilayer graphene in a fast single step (2.5 minutes), at reduced temperatures (760 °C) using microwave plasma-enhanced chemical vapor deposition (MW-PECVD). Raman spectroscopy confirmed that nitrogen-doped bilayer structures were produced by this method. XPS analysis showed that we achieved control of the concentration of nitrogen dopants incorporated into the final samples. We have performed state of the art parameter-free simulations to investigate the cause of an unexpected splitting of the XPS signal as the concentration of nitrogen defects increased. We show that this splitting is due to the formation of interlayer bonds mediated by nitrogen defects on the layers of the material. The occurrence of these bonds may result in very specific electronic and mechanical properties of the bilayer structures.

scholarly journals Scalable Synthesis of 1,3,4,5-Tetraaryl Imidazolium Salts as Precursors of Sterically Demanding N-Heterocyclic Carbenes

SynOpen ◽  
2020 ◽  
Vol 04 (01) ◽  
pp. 01-11
Author(s):  
Cengiz Azap ◽  
Anna Christoffers ◽  
Renat Kadyrov
Keyword(s):  
Large Scale ◽  
Oxidative Desulfurization ◽  
Heterocyclic Carbenes ◽  
Imidazolium Salts ◽  
Imidazolium Salt ◽  
Available N ◽  
Sterically Demanding ◽  
Cost Efficient ◽  
Scalable Synthesis ◽  
Electron Donation

A convenient, large-scale, and cost-efficient synthesis of 4,5-diarylsubstituted N,N-diarylimidazolium salts is described. A variety of 1,3,4,5-tetraaryl imidazolium salts with increasing electron donation and steric bulk of the N-aryl groups was synthesized in good yields. In the key step, readily available N,N′-diarylthioureas and benzoin/anisoin are coupled to give imidazole-2-thiones, followed by imidazolium salt formation by oxidative desulfurization. In this way, N,N-diarylimidazolium salts with 2-methoxy, 2-methyl, and 2-isopropyl substituents could be obtained; the synthesis of their 2-tert-butyl, 2,6-dimethyl, and 2,6-diisopropyl analogues failed.

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