Fermi-level pinning at the interface between metals and nitrogen-doped Ge2Sb2Te5 examined by x-ray photoelectron spectroscopy

2009 ◽  
Vol 95 (19) ◽  
pp. 192109 ◽  
Author(s):  
Lina Wei-Wei Fang ◽  
Rong Zhao ◽  
Jisheng Pan ◽  
Zheng Zhang ◽  
Luping Shi ◽  
...  
Keyword(s):  
Fermi Level ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Nitrogen Doped ◽  
Fermi Level Pinning

Hydrogenation and dehydrogenation of nitrogen-doped graphene investigated by X-ray photoelectron spectroscopy

2015 ◽  
Vol 634 ◽  
pp. 89-94 ◽  
Author(s):  
F. Späth ◽  
W. Zhao ◽  
C. Gleichweit ◽  
K. Gotterbarm ◽  
U. Bauer ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

scholarly journals Hydrothermal Activation of Porous Nitrogen-Doped Carbon Materials for Electrochemical Capacitors and Sodium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2163 ◽  
Author(s):  
Yuliya V. Fedoseeva ◽  
Egor V. Lobiak ◽  
Elena V. Shlyakhova ◽  
Konstantin A. Kovalenko ◽  
Viktoriia R. Kuznetsova ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Nanomaterials ◽  
Carbon Materials ◽  
Sodium Ion ◽  
Carbon Surface ◽  
Energy Storage And Conversion ◽  
Sodium Ion Batteries ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Highly porous nitrogen-doped carbon nanomaterials have distinct advantages in energy storage and conversion technologies. In the present work, hydrothermal treatments in water or ammonia solution were used for modification of mesoporous nitrogen-doped graphitic carbon, synthesized by deposition of acetonitrile vapors on the pyrolysis products of calcium tartrate. Morphology, composition, and textural characteristics of the original and activated materials were studied by transmission electron microscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, infrared spectroscopy, and nitrogen gas adsorption method. Both treatments resulted in a slight increase in specific surface area and volume of micropores and small mesopores due to the etching of carbon surface. Compared to the solely aqueous medium, activation with ammonia led to stronger destruction of the graphitic shells, the formation of larger micropores (1.4 nm vs. 0.6 nm), a higher concentration of carbonyl groups, and the addition of nitrogen-containing groups. The tests of nitrogen-doped carbon materials as electrodes in 1M H2SO4 electrolyte and sodium-ion batteries showed improvement of electrochemical performance after hydrothermal treatments especially when ammonia was used. The activation method developed in this work is hopeful to open up a new route of designing porous nitrogen-doped carbon materials for electrochemical applications.

Interaction between Graphene Oxide and the Mycelia of Morchella sextelata

NANO ◽  
2020 ◽  
Vol 15 (03) ◽  
pp. 2050035
Author(s):  
Renhao Tan ◽  
Jiwei Li ◽  
Li Zhou ◽  
Lu Zhou ◽  
Jia Lei ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Growth Process ◽  
Culture Media ◽  
Xps Analysis ◽  
Potential Harm ◽  
X Ray ◽  
Nitrogen Doped ◽  
Mda Content ◽  
High Level

Graphene oxide (GO) is expected to be harmful to the environment due to the toxicity. Accordingly, this work aimed to assess the potential harm of GO to the environment by investigating the toxicity of GO to the M. sextelata, and the effects of M. sextelata to GO. The dry weights, IR spectra, morphology, ultra-structures of mycelia, pH, conductivities of culture media, the activity of superoxide dismutase (SOD) and malondialdehyde (MDA) contents were measured to display the potential hazards of GO to M. sextelata. Then the Raman spectroscopy, dispersibility, and X-ray photoelectron spectroscopy (XPS) of GO were measured to show the effect of M. sextelata on GO. The results indicated that the lower GO concentrations promoted the growth of M. sextelata while the high level of GO inhibited the growth process of M. sextelata. After 7 d of culture, the effect was suppressive, with the biomass significantly reduced by 10.10%, the MDA content of G200 increased by 69.06%. GO nanosheets covered the surface of mycelia which caused change of the mycelial microstructures. Correspondingly, M. sextelata induces more defects in GO, accompanied by poor dispersion of GO in ethanol. Based on the XPS analysis, in the G10, G50 and G200 treatments, their atomic percentage of nitrogen in GO increased by 3.03%, 4.28% and 2.2%, respectively, and the atomic percentage of oxygen in GO reduced by 8.61%, 9.42% and 4.09%, respectively. The effect of mycelia on GO is mainly in deoxygenated and nitrogen-doped. We expected that the above results would provide a reference for the environmental hazard of GO.

Fabrication of Nickel Sulfide/Nitrogen-Doped Reduced Graphene Oxide Nanocomposite as Anode Material for Lithium-Ion Batteries and Its Electrochemical Performance

2020 ◽  
Vol 20 (11) ◽  
pp. 6782-6787
Author(s):  
Yeon-Ju Lee ◽  
Tae-Hyun Ha ◽  
Gyu-Bong Cho ◽  
Ki-Won Kim ◽  
Jou-Hyeon Ahn ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Lithium Ion ◽  
Treatment Method ◽  
Retention Capacity ◽  
Graphene Nanocomposites ◽  
X Ray ◽  
Nitrogen Doped ◽  
Reduced Graphene

In this study, NiS/graphene nanocomposites were synthesized by simple heat treatment method of three graphene materials (graphene oxide (GO), reduced graphene oxide (rGO) and nitrogen-doped graphene oxide (N-rGO)) and NiS precursor. The morphology and crystal structure of NiS/graphene nanocomposites were characterized using field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Electrochemical properties were also investigated. NiS/graphene nanocomposites homogeneously wrapped by graphene materials have been successfully manufactured. Among the three nanocomposites, NiS/N-rGO nanocomposite exhibited the highest initial and retention capacity in discharge, respectively, of 1240 mAh/g and 467 mAh/g up to 100 cycles at 0.5 C.

Preparation of N-doped TiO2 by oxidizing TiN and its application on phenol degradation

2013 ◽  
Vol 68 (4) ◽  
pp. 934-939 ◽  
Author(s):  
Ji-Guo Huang ◽  
Xiao-Guang Zhao ◽  
Meng-Yang Zheng ◽  
Sen Li ◽  
Yu Wang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance ◽  
Phenol Degradation ◽  
Light Sources ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Doped Tio2 ◽  
X Ray ◽  
Nitrogen Doped ◽  
Different Temperatures

Incomplete oxidation of titanium nitride (TiN) to prepare nitrogen-doped TiO2 was verified by calcining TiN at different temperatures in air for 30 min. The as-prepared samples were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectra and X-ray photoelectron spectroscopy. The results confirmed that oxidizing TiN incompletely is an effective and simple method to prepare nitrogen-doped TiO2. Photocatalytic degradation of phenol was conducted to evaluate the photocatalytic activity of as-prepared samples. The results showed that phenol can be degraded efficiently by the as-prepared samples under visible light; low phenol concentration was conducive to degradation; the optimum calcination temperature and photocatalyst dosage are 650 °C and 0.5 g/L, respectively. The effects of different light sources on phenol degradation were compared. The reusability of nitrogen-doped TiO2 was tested and the results indicated a relatively good reusability under laboratory conditions.

Preparation and Characterization of N Doped TiO2/ Sepiolite Composite Materials

2011 ◽  
Vol 284-286 ◽  
pp. 597-600
Author(s):  
Dai Mei Chen ◽  
Hai Peng Ji ◽  
Jian Xin Wang ◽  
Jian Chen ◽  
Xin Long Luan ◽  
...  
Keyword(s):  
Composite Materials ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Contents ◽  
Scanning Electron ◽  
Oxygen Atoms

Nitrogen doped TiO2/sepiolite composite materials (N-TiO2/sep) with different nitrogen contents were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), respectively. XRD and SEM results showed that anatase-TiO2nanoparticles were distributed homogenously on the surface of sepiolite. XPS revealed that N atoms could incorporate into the lattice of anatase TiO2substituting the oxygen atoms sites of oxygen atoms.

scholarly journals Enhanced CO2 Adsorption on Nitrogen-Doped Carbon Materials by Salt and Base Co-Activation Method

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1207 ◽  
Author(s):  
Ruiping Wei ◽  
Xingchao Dai ◽  
Feng Shi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Co2 Adsorption ◽  
Activation Method ◽  
Formaldehyde Resin ◽  
Co2 Absorption ◽  
X Ray ◽  
Nitrogen Doped ◽  
Co Activation ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon materials with enhanced CO2 adsorption were prepared by the salt and base co-activation method. First, resorcinol-formaldehyde resin was synthesized with a certain salt as an additive and used as a precursor. Next, the resulting precursor was mixed with KOH and subsequently carbonized under ammonia flow to finally obtain the nitrogen-doped carbon materials. A series of samples, with and without the addition of different salts, were prepared, characterized by XRD (X-ray powder diffraction), elemental analysis, BET (N2-adsorption-desorption analysis), XPS (X-ray photoelectron spectroscopy) and SEM (Scanning electron microscopy) and tested for CO2 adsorption. The results showed that the salt and base co-activation method has a remarkable enhancing effect on the CO2 capture capacity. The combination of KCl and KOH was proved to be the best combination, and 167.15 mg CO2 could be adsorbed with 1 g nitrogen-doped carbon at 30 °C under 1 atm pressure. The materials characterizations revealed that the introduction of the base and salt could greatly increase the content of doped nitrogen, the surface area and the amount of formed micropore, which led to enhanced CO2 absorption of the carbon materials.

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