Characterization of gold nanoclusters synthesized on carbon nanotubes film: Evaluation of the size distributions by means of X-ray photoelectron spectroscopy

Carbon nanotubes/alumina (CNTs/Al2O3) nanocomposites were prepared by the poly (dopamine) assisted chemical liquid phase deposition (CLPD). The poly (dopamine) layers were firstly coated on the CNTs surface uniformly by the self-oxidative polymerization of dopamine in mild aqueous solution and then the Al2O3 nanoparticles formed on the poly (dopamine) coated CNTs surface by the CLPD. The hydrophilic poly (dopamine) layers on the CNTs surface can improve the dispersion of CNTs in aqueous solution. Moreover, it can be used as a key linker between the CNTs and Al2O3 because of the nitrogen-containing group in poly (dopamine) could coordinate with Al3+ ions. The as-prepared poly (dopamine) coated CNTs and CNTs/Al2O3 nanohybrids were characterized by X-ray photoelectron spectroscopy (XPS), X-radial diffractometer (XRD) and high resolution transmission electron microscopy (HRTEM). These results showed that the poly (dopamine) layers were coated on the surface of CNTs uniformly, and the Al2O3 nanoparticles embellished with the poly (dopamine) coated CNTs surface. Compared with pristine NR composites, the thermal conductivity of the as-prepared NR/CNTs@Al2O3 composites increased 17%.

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Characterization of the Electronic Properties of Single‐Walled Carbon Nanotubes Filled with an Electron Donor—Rubidium Iodide: Multifrequency Raman and X‐ray Photoelectron Spectroscopy Studies

physica status solidi (b) ◽

10.1002/pssb.201900209 ◽

2019 ◽

Vol 256 (12) ◽

pp. 1900209

Author(s):

Marianna V. Kharlamova ◽

Christian Kramberger ◽

Paolo Rudatis ◽

Kazuhiro Yanagi ◽

Dominik Eder

Keyword(s):

Carbon Nanotubes ◽

Electronic Properties ◽

Electron Donor ◽

Photoelectron Spectroscopy ◽

Single Walled Carbon Nanotubes ◽

X Ray ◽

Single Walled Carbon ◽

Spectroscopy Studies ◽

Walled Carbon Nanotubes

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Surface characterization of oxygen-functionalized multi-walled carbon nanotubes by high-resolution X-ray photoelectron spectroscopy and temperature-programmed desorption

Applied Surface Science ◽

10.1016/j.apsusc.2007.07.120 ◽

2007 ◽

Vol 254 (1) ◽

pp. 247-250 ◽

Cited By ~ 151

Author(s):

Wei Xia ◽

Yuemin Wang ◽

Ralf Bergsträßer ◽

Shankhamala Kundu ◽

Martin Muhler

Keyword(s):

Carbon Nanotubes ◽

High Resolution ◽

Photoelectron Spectroscopy ◽

Surface Characterization ◽

Temperature Programmed Desorption ◽

X Ray ◽

Multi Walled Carbon Nanotubes ◽

Temperature Programmed ◽

Walled Carbon Nanotubes

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Green Synthesis and Characterization of Carbon Nanotubes/Polyaniline Nanocomposites

Journal of Spectroscopy ◽

10.1155/2015/297804 ◽

2015 ◽

Vol 2015 ◽

pp. 1-9 ◽

Cited By ~ 26

Author(s):

Van Hoa Nguyen ◽

Jae-Jin Shim

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Photoelectron Spectroscopy ◽

Interfacial Polymerization ◽

Nickel Foam ◽

Green Solvents ◽

X Ray ◽

Transmission Electron ◽

Two Phases

Carbon nanotubes/polyaniline (CNT/PANI) nanocomposites were synthesized by the interfacial polymerization of aniline in the presence of CNTs using two green solvents, water and an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF4]), as the two phases. The formation and incorporation of PANI on the surface of the CNTs were confirmed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy ultraviolet-visible spectroscopy, and X-ray photoelectron spectroscopy. The analyses showed that the surface of the CNTs was coated with different morphologies of thin PANI layers depending on whether a HCl or HNO3solution was used. The thermal stability of the composites was much better than that of the bare CNTs and pure PANI. The as-prepared composites were also used to modify the nickel foam electrodes for characterization of the electrochemical properties.

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Characterization of Nitrogen-Doped Carbon Nanotubes by Atomic Force Microscopy, X-ray Photoelectron Spectroscopy and X-ray Absorption Near Edge Spectroscopy

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2009.ns42 ◽

2009 ◽

Vol 9 (6) ◽

pp. 3633-3638 ◽

Cited By ~ 9

Author(s):

C. Morant ◽

R. Torres ◽

I. Jimenez ◽

J. M. Sanz ◽

E. Elizalde

Keyword(s):

Carbon Nanotubes ◽

Atomic Force Microscopy ◽

Photoelectron Spectroscopy ◽

X Ray ◽

Force Microscopy ◽

Nitrogen Doped ◽

Atomic Force ◽

Nitrogen Doped Carbon ◽

X Ray Absorption

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Nanotechnologies. Characterization of single-wall carbon nanotubes using scanning electron microscopy and energy dispersive X-ray spectrometry analysis

10.3403/30175301u ◽

2015 ◽

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Scanning Electron Microscopy ◽

Energy Dispersive ◽

Single Wall Carbon Nanotubes ◽

Single Wall Carbon ◽

X Ray ◽

Spectrometry Analysis ◽

Scanning Electron

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Highly active carbon nanotube–promoted Rh-Mn-Li/SiO2 catalysts for the synthesis of C2+ oxygenates from syngas

Journal of Chemical Research ◽

10.1177/1747519820984728 ◽

2021 ◽

pp. 174751982098472

Author(s):

Jun Yu ◽

Ying Han ◽

Guoqing Chen ◽

Xiuzhen Xiao ◽

Haifang Mao ◽

...

Keyword(s):

Carbon Nanotubes ◽

Photoelectron Spectroscopy ◽

Co Hydrogenation ◽

X Ray ◽

Highly Active ◽

Transmission Electron ◽

Co Insertion ◽

Temperature Programmed Surface Reaction ◽

Temperature Programmed ◽

Oxygenate Synthesis

The effect of carbon nanotubes on the catalytic properties of Rh-Mn-Li/SiO2 catalysts was investigated for CO hydrogenation. The catalysts were comprehensively characterized by means of X-ray power diffraction, N2 sorption, transmission electron microscope, H2–temperature-programmed reduction, CO–temperature-programmed desorption, temperature-programmed surface reaction, and X-ray photoelectron spectroscopy. The results showed that an appropriate amount of carbon nanotubes can be attached to the surface of the SiO2 sphere and can improve the Rh dispersion. Moderate Rh-Mn interaction can be obtained by doping with the appropriate amount of carbon nanotubes, which promotes the formation of strongly adsorbed CO and facilitates the progress of CO insertion, resulting in the increase in the selectivity of C2+ oxygenate synthesis.

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The Growth and Characterization of Germanium-Carbon Alloy Thin Films

MRS Proceedings ◽

10.1557/proc-270-91 ◽

1992 ◽

Vol 270 ◽

Author(s):

Haojie Yuan ◽

R. Stanley Williams

Keyword(s):

Thin Films ◽

Photoelectron Spectroscopy ◽

Vacuum Chamber ◽

Optical Band Gap ◽

High Vacuum ◽

Optical Absorption Spectroscopy ◽

Alloy Thin Film ◽

New Materials ◽

X Ray

ABSTRACTThin films of pure germanium-carbon alloys (GexC1−x with x ≈ 0.0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) have been grown on Si(100) and A12O3 (0001) substrates by pulsed laser ablation in a high vacuum chamber. The films were analyzed by x-ray θ-2θ diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), conductivity measurements and optical absorption spectroscopy. The analyses of these new materials showed that films of all compositions were amorphous, free of contamination and uniform in composition. By changing the film composition, the optical band gap of these semiconducting films was varied from 0.00eV to 0.85eV for x = 0.0 to 1.0 respectively. According to the AES results, the carbon atoms in the Ge-C alloy thin film samples has a bonding configuration that is a mixture of sp2 and sp3 hybridizations.

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Synthesis of Exosome-Based Fluorescent Gold Nanoclusters for Cellular Imaging Applications

International Journal of Molecular Sciences ◽

10.3390/ijms22094433 ◽

2021 ◽

Vol 22 (9) ◽

pp. 4433

Author(s):

Eun Sung Lee ◽

Byung Seok Cha ◽

Seokjoon Kim ◽

Ki Soo Park

Keyword(s):

Photoelectron Spectroscopy ◽

Low Cost ◽

Stokes Shift ◽

Gold Nanoclusters ◽

Human Colon ◽

Cellular Imaging ◽

Metal Nanoclusters ◽

Human Colon Cancer ◽

X Ray ◽

High Concentrations

In recent years, fluorescent metal nanoclusters have been used to develop bioimaging and sensing technology. Notably, protein-templated fluorescent gold nanoclusters (AuNCs) are attracting interest due to their excellent fluorescence properties and biocompatibility. Herein, we used an exosome template to synthesize AuNCs in an eco-friendly manner that required neither harsh conditions nor toxic chemicals. Specifically, we used a neutral (pH 7) and alkaline (pH 11.5) pH to synthesize two different exosome-based AuNCs (exo-AuNCs) with independent blue and red emission. Using field-emission scanning electron microscopy, energy dispersive X-ray microanalysis, nanoparticle tracking analysis, and X-ray photoelectron spectroscopy, we demonstrated that AuNCs were successfully formed in the exosomes. Red-emitting exo-AuNCs were found to have a larger Stokes shift and a stronger fluorescence intensity than the blue-emitting exo-AuNCs. Both exo-AuNCs were compatible with MCF-7 (human breast cancer), HeLa (human cervical cancer), and HT29 (human colon cancer) cells, although blue-emitting exo-AuNCs were cytotoxic at high concentrations (≥5 mg/mL). Red-emitting exo-AuNCs successfully stained the nucleus and were compatible with membrane-staining dyes. This is the first study to use exosomes to synthesize fluorescent nanomaterials for cellular imaging applications. As exosomes are naturally produced via secretion from almost all types of cell, the proposed method could serve as a strategy for low-cost production of versatile nanomaterials.

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