Two-dimensional N/O co-doped porous turbostratic carbon nanomeshes with expanded interlayer spacing as host material for potassium/lithium half/full batteries

2021 ◽  
Author(s):  
Dongyang Qu ◽  
Bolin Zhao ◽  
Zhongqian Song ◽  
Dan Dan Wang ◽  
Huijun Kong ◽  
...  
Keyword(s):  
Carbon Nanomaterials ◽  
Interlayer Spacing ◽  
Host Material ◽  
Two Dimensional ◽  
Environment Friendly ◽  
Turbostratic Carbon ◽  
Co Doped

The development of carbon nanomaterials with the resource-rich and environment-friendly merits as stabilized rechargeable ion batteries anode is facing enormous challenge due to the limited interlayer spacing and tardy kinetics....

A polarization propagation mechanism of Fe and Cu atoms co-doped in two-dimensional-Si3N4

2020 ◽  
Vol 44 (33) ◽  
pp. 14082-14086
Author(s):  
Weili Li ◽  
Zhengxin Yan ◽  
Xiaowei Zhai ◽  
Li Chen ◽  
Wei Liu ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Spin Polarization ◽  
Propagation Mechanism ◽  
Two Dimensional ◽  
Honeycomb Structures ◽  
Co Doped

Fe and Cu atoms doped into two dimensional (2D) Si3N4 honeycomb structures exhibit magnetic anisotropy, and planar spin-polarization propagation.

scholarly journals Recent Advancements in Doped/Co-Doped Carbon Quantum Dots for Multi-Potential Applications

2019 ◽  
Vol 5 (2) ◽  
pp. 24 ◽  
Author(s):  
Ganeshlenin Kandasamy
Keyword(s):  
Quantum Dots ◽  
Optical Sensors ◽  
Carbon Nanomaterials ◽  
Synthesis Method ◽  
Carbon Quantum Dots ◽  
Carbon Nanodots ◽  
Synthesis Methods ◽  
Sensing Applications ◽  
Potential Applications ◽  
Co Doped

Carbon quantum dots (CQDs)/carbon nanodots are a new class of fluorescent carbon nanomaterials having an approximate size in the range of 2–10 nm. The majority of the reported review articles have discussed about the development of the CQDs (via simple and cost-effective synthesis methods) for use in bio-imaging and chemical-/biological-sensing applications. However, there is a severe lack of consolidated studies on the recently developed CQDs (especially doped/co-doped) that are utilized in different areas of application. Hence, in this review, we have extensively discussed about the recent development in doped and co-doped CQDs (using elements/heteroatoms—e.g., boron (B), fluorine (F), nitrogen (N), sulphur (S), and phosphorous (P)), along with their synthesis method, reaction conditions, and/or quantum yield (QY), and their emerging multi-potential applications including electrical/electronics (such as light emitting diode (LED) and solar cells), fluorescent ink for anti-counterfeiting, optical sensors (for detection of metal ions, drugs, and pesticides/fungicides), gene delivery, and temperature probing.

Simulations of X-Ray Scattering on Two-Dimensional, Graphitic and Turbostratic Carbon Structures

2013 ◽  
Vol 15 (12) ◽  
pp. 1280-1291 ◽  
Author(s):  
Milan Dopita ◽  
Martin Rudolph ◽  
Anton Salomon ◽  
Marcus Emmel ◽  
Christos G. Aneziris ◽  
...  
Keyword(s):  
Two Dimensional ◽  
X Ray ◽  
Turbostratic Carbon ◽  
X Ray Scattering ◽  
Carbon Structures ◽  
Ray Scattering

Quantum-confined photoresponse tuning of an Esaki–Tsu-type doping superlattice

1991 ◽  
Vol 69 (1) ◽  
pp. 1-7 ◽  
Author(s):  
B. Ullrich ◽  
R. Hott ◽  
J. E. Cunningham
Keyword(s):  
Valence Band ◽  
Conduction Band ◽  
Host Material ◽  
Two Dimensional ◽  
Photocurrent Response ◽  
Contact Distance ◽  
Doping Technique ◽  
First Time ◽  
Direct Confirmation ◽  
Photocurrent Spectra

We performed photocurrent measurements on GaAs-type-A (Esaki–Tsu-type) doping superlattices produced by a δ-doping technique (impurity growth mode) using a new kind of p- and n-contact on a 500 μm × 500 μm mesa plane. We measured, for the first time, a monotonically increased photocurrent below the gap of the host material with horizontal plateaus, as expected for two-dimensional systems. This is the direct confirmation of the two-dimensional nature of this kind of superlattice. In this context, the influence of the contact distance on the photocurrent response is discussed showing that, in contrast to the general case, a variation of the distance between the contacts not only results in a scaling of the photocurrent spectra but changes the complete shape of the photocurrent response for these two-dimensional structures. The possible energetic transitions between the valence band and the conduction band below the gap of the host material, causing the absorption of the doping superlattice, are calculated and explained with an analytical theory. Furthermore, a comparison with other previously performed numerical calculations shows the limits of validity of the analytical calculations presented here.

Novel Two-Dimensional Carbon Nanomaterials: Synthesis and Excellent Lithium Storage Properties

2014 ◽  
Vol 1070-1072 ◽  
pp. 483-487
Author(s):  
Yong Qiang Yang ◽  
Hong Kang Deng ◽  
Ling Jin ◽  
Yuan Liu ◽  
Yao Lu
Keyword(s):  
Anode Materials ◽  
Carbon Nanomaterials ◽  
High Capacity ◽  
Lithium Ion ◽  
Inert Atmosphere ◽  
Two Dimensional ◽  
Lithium Storage ◽  
Structure Directing Agent ◽  
Nanomaterials Synthesis ◽  
Storage Properties

A novel two-dimensional carbon nanomaterials was prepared through a facile hydrothermal method, using glucose as the carbon precursor and sodium borohydride as the structure directing agent. The application of as-obtained carbon nanomaterials after annealing in inert atmosphere as the anode of lithium ion batteries (LIBs) was explored. The results demonstrate the carbon nanomaterials can exhibit more excellent lithium storage properties with high capacity and superior rate properties than the graphite as a kind of common anode materials.

scholarly journals COMPARATIVE STUDY ON THE SYNTHESES OF CARBON NANOMATERIALS USING POLYETHYLENE AND RISK HUSK AS CARBON PRECURSOR

2020 ◽  
Vol 4 (3) ◽  
pp. 731-734
Author(s):  
Nicodemus Kure ◽  
Isaac Hyuk Daniel ◽  
B. U. Machu ◽  
I. A. Bello ◽  
M. Ansnawi
Keyword(s):  
Atmospheric Pressure ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Defect Mode ◽  
Average Diameter ◽  
Interlayer Spacing ◽  
Microwave Energy ◽  
Synthesis Process ◽  
Carbon Precursor ◽  
Carbon Quality

The study compares the syntheses of carbon nanostructures (CNS) using polyethylene (PE) and Rice husk (RH) as carbon precursor via commercial microwave oven at 2.45 GHz. The Microwave energy offers the requisite temperature for catalytic disintegration of the carbon precursors at 750 °C under atmospheric pressure. The CNS were grown on coated silicon dioxide. The as-synthesized CNS was analysed with Raman spectroscopy which shows carbon quality was found to be 0.92 and 1.01 in PE and RH respectively, indicating good graphitic nature with average diameter at (16.0 to 20.0) ± 0.5 nm. The high intensity ratio is attributed to the defect mode in the CNS. The Field Emission Scanning Microscope (FESEM) analysis shows a warped and randomly oriented structures with an interlayer spacing of about 0.35 nm in the internal structure of most CNS. Furthermore, the level of purity in the graphitic nature of the CNS were obtained with Thermogravimetric Analysis (TGA) technique with 90 % in PE and 50 % in RH. Hence, a fast and cheaper method of synthesizing CNS utilizing microwave energy was demonstrated at 750 °C under atmospheric pressure. Lastly, the presence of catalyst, carbon precursors and plasma are necessary for the microwave heating and synthesis process.

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