Structure and photoluminescence of boron-doped carbon nanoflakes grown by hot filament chemical vapour deposition

Wang, Biben; Ostrikov, Kostya Ken; Laan, Timothy van der; Shao, Ruiwen; Li, Lin

doi:10.1039/c4tc01974a

Cited by 23 publications

(15 citation statements)

References 34 publications

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“…However, an additional peak was seen at 57.8 eV, attributable to Se bonded to C . As shown in Figure d, the C 1s spectrum featured peaks at 284.6 eV (sp 2 ‐carbon) and 285.5 eV (sp 3 ‐carbon) . Consistently with the results for Se, an additional peak was seen at 290.0 eV due to the aforementioned Se−C chemical bonds .…”

Section: Resultssupporting

confidence: 58%

A Self‐Repairing Cathode Material for Lithium–Selenium Batteries: Se−C Chemically Bonded Selenium–Graphene Composite

Sha

Gao

Ren

et al. 2018

Chemistry A European J

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Lithium–selenium batteries, employing selenium as a cathode material, exhibit some notable advantages, such as high discharge rates and good cycling performance, due to their high electrical conductivity, high output voltages, and high volumetric capacity density. However, an important problem, termed the “shuttle effect”, can lead to capacity decay in Li‐Se cells (and in Li‐S cells), which arises from aggregation and the loss of Se or S from the cathode into the electrolyte. In this work, in order to solve this problem, a new self‐repairing system has been devised, in which some Se atoms are chemically bonded to the carbon atoms of graphene and act as reclaiming points for dissociated Se atoms through the establishment of ‐Se‐Se‐Se‐ chains. Se‐decorated graphene (Se‐GE) was first constructed through a facile high‐energy ball‐milling process. Its formation was confirmed by XRD, SEM, HRTEM, XPS, and Raman analyses. As we anticipated, in examining cell properties, the as‐prepared Se‐GE composite underwent an initial capacity decay in the first 20 cycles (from 1050 mAh g−1 to 750 mAh g−1, ca. 29 % loss), but the capacity then reverted to 970 mAh g−1 (ca. 92 % of the initial value). Other measurements were also consistent with the recapture of dissociated Se atoms.

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Section: Resultssupporting

confidence: 58%

A Self‐Repairing Cathode Material for Lithium–Selenium Batteries: Se−C Chemically Bonded Selenium–Graphene Composite

Sha

Gao

Ren

et al. 2018

Chemistry A European J

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“…Figure (c) shows the fitting result for the C 1 s XPS peak of sample C, which shows two peaks centered at about 284.6 and 285.4 eV. These two peaks are attributed to sp 2 and sp 3 carbon, respectively, and the sp 3 carbon can further increase the intensity of D peak. Based on Figure (c), we calculate the integral intensity ratio of two peaks related to sp 2 and sp 3 carbon and it is about 2.1.…”

Section: Resultsmentioning

confidence: 98%

Plasma‐Produced Vertical Carbonous Nanoflakes for Li‐Ion Batteries

Shao

Wang

et al. 2016

Plasma Processes & Polymers

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An effective method to produce vertically-oriented carbonous nanoflakes (VCNFs) on copper foils using an advanced custom-designed plasma-enhanced horizontal tube furnace deposition system under different RF powers at 850 8C without using any binder or catalyst materials is demonstrated. The morphology and structure of the synthesized carbonous materials are investigated using Raman spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. It is shown that the VCNFs can be effectively synthesized at moderate RF powers. When the RF power is 660 W, VCNFs which are only 2 atomic carbon layers thin, can be grown. The thickness and level of structural defects in the VCNFs can also be controlled by changing the RF power. A plausible growth mechanism for VCNFs under the plasma conditions is proposed. The synthesized VCNFs are applied as a cathode material for Li-ion batteries. The coin-type batteries demonstrate stable efficiency ($99%) and specific capacity (110 mAh g À1 ) over 100 charge-discharge cycles.

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“…60,61 Beside nitrogen, also boron and fluorine can be used to dope graphene. Boron-doped 2D carbons with photoluminescence properties, obtained by hot-filament CVD technique, have been recently reported by Wang et al 62 . An absorption band at about 790 cm -1 in the IR spectrum, associated with the C-B bonds, provides evidence of the boron incorporation in the material.…”

Section: Ft-ir Spectroscopy Of Go Rgo and Doped Gomentioning

confidence: 99%

CHAPTER 4. Raman, IR and INS Characterization of Functionalized Carbon Materials

Groppo¹,

Bonino²,

Cesano³

et al. 2018

Catalysis Series

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Vibrational spectroscopies represent a powerful tool to investigate the structural properties at an atomic level. In particular, the analysis of the spectra allows to have detailed information on both structure and chemical environment of different sites. Therefore, the spectroscopic characterization can usefully assist in the comprehension of the parameters ruling the unique catalytic properties of metal-free carbon materials, as well as to implement the knowledge in the design of new C-containing systems. Keeping in mind these purposes, the present Chapter tries to provide some insights on the information obtained by using vibrational spectroscopies to characterize carbonaceous materials. Intriguing and quite recently investigated systems will be illustrated as "case histories" to show what can be learned from the analysis of the spectra collected in different experimental conditions.The results concerning activated carbons, carbon nanotubes, graphene oxide as well as carbon nitrides or fullerenes will be discussed in order to investigate the effect of the pretreatment and of the functionalization/doping on the catalytic activity in different applications. Raman spectroscopy applied to carbonsRaman spectroscopy is based on the inelastic light scattering of a laser source in the near IR -UV range.Backscattered photons come out with a lower (ν 0 −ν vibr ) or higher (ν 0 +νvibr) energy with respect to the incoming laser photons (ν 0 ). The energy difference (ν vibr ) corresponds to the vibrational mode. A Raman active vibrational mode should involve a change in the electric polarizability. This powerful technique is widely adopted in the characterization of carbon derived materials, both crystalline [e.g. HOPG (highly oriented pyrolytic graphite), nano-graphite] or amorphous (e.g. turbostratic carbon, carbon fibers etc.). Raman spectroscopy of perfect and defective graphiteThe Raman spectrum of perfect graphite (e.g. HOPG) with large crystalline domains is dominated by a sharp peak centred at 1580 cm -1 (historically indicated as G peak, first order, see Figure 1a, top), which is attributed to a E 2g mode (Figure 1c, part A). In addition, a complex envelope of bands appears in the 2800-2600 cm -1 region (second order), mostly due to combination modes. In particular, two main peaks are observed in the spectrum of perfect graphite, originally indicated as G´2 (high frequency side, sharp) and G´1

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Structure and photoluminescence of boron-doped carbon nanoflakes grown by hot filament chemical vapour deposition

Abstract: Boron-doped carbon nanoflakes were directly synthesized by hot filament chemical vapor deposition, nontoxic boron carbide was used as the boron source.

Cited by 23 publications

References 34 publications

A Self‐Repairing Cathode Material for Lithium–Selenium Batteries: Se−C Chemically Bonded Selenium–Graphene Composite

A Self‐Repairing Cathode Material for Lithium–Selenium Batteries: Se−C Chemically Bonded Selenium–Graphene Composite

Plasma‐Produced Vertical Carbonous Nanoflakes for Li‐Ion Batteries

CHAPTER 4. Raman, IR and INS Characterization of Functionalized Carbon Materials

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