Surface characterization of Co/CNx granular films fabricated by nanolamination

Ruby, C.; Zhou, J. N.; Du, Juwei; Street, S. C.; Barnard, J.

doi:10.1002/(sici)1096-9918(200001)29:1<38::aid-sia691>3.3.co;2-w

Cited by 5 publications

(7 citation statements)

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“…The binding energies were calibrated relative to the CNTs C1s peak at 285.2 eV to compensate for charging and work function effects. The energy of the Co2p 3/2 peak for metallic cobalt is 778.3 eV [14]. However, in Figure 4, the position of the main peak in the Co2p photoemission spectrum is shifted to a higher binding energy indicating the presence of cobalt oxides.…”

Section: Resultsmentioning

confidence: 93%

Multiwalled Carbon Nanotubes Decorated with Cobalt Oxide Nanoparticles

Larrudé

Ayala

Costa

et al. 2012

Journal of Nanomaterials

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Multiwalled carbon nanotubes (MWCNTs) synthesized by spray pyrolysis were decorated with cobalt oxide nanoparticles using a simple synthesis route. This wet chemistry method yielded nanoparticles randomly anchored to the surface of the nanotubes by decomposition of cobalt nitrate hexahydrate diluted in acetone. Electron microscopy analysis indicated that dispersed particles were formed on the MWCNTs walls. The average size increased with the increasing concentration of cobalt nitrate in acetone in the precursor mixture. TEM images indicated that nanoparticles were strongly attached to the tube walls. The Raman spectroscopy results suggested that the MWCNT structure was slightly damaged after the nanoparticle growth.

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Section: Resultsmentioning

confidence: 93%

Multiwalled Carbon Nanotubes Decorated with Cobalt Oxide Nanoparticles

Larrudé

Ayala

Costa

et al. 2012

Journal of Nanomaterials

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“…X‐ray photoelectron spectroscopy (XPS) measurements were performed to further reveal the core‐shell structure of as‐prepared Ni@Co particles. No Ni 2p 3/2 XPS signal was observed on n‐Si/SiO x /Ni@Co. After ion milling of about 10 nm, the sample exhibits strong metallic Ni 2p 3/2 (852.4 eV) and metallic Co 2p 3/2 (778.2 eV) XPS peaks, demonstrating the conformal Co shell on Ni core (Figure S3a and S3b). Note that the XPS analysis on the shell without ion milling exhibited the existence of Co 2+ species with a binding energy of 780 eV and O 2− species with a binding energy of 529.6 eV, suggesting that the amorphous shell was composed of CoO (Figure S3b) .…”

Section: Resultsmentioning

confidence: 90%

High‐Performance and Stable Silicon Photoanode Modified by Crystalline Ni@ Amorphous Co Core‐Shell Nanoparticles

Chen

Wang

et al. 2018

ChemCatChem

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Improving the charge separation and transport efficiency at semiconductor-electrolyte interface is critical for high-performance photoelectrochemical (PEC) water-splitting devices. Here, the core-shell-structured Ni@Co nanoislands were electrodeposited onto the surface of n-type Si photoanode to construct a metal-insulator-semiconductor (MIS) structure. We discover that the high-quality interface in Si/SiO x /Ni MIS structure is more efficient for charge extraction and transfer than Si/SiO x /Co. Owing to a slightly higher work function for Co (5.0 eV) than Ni (4.6 eV), the Si/SiO x /Ni@Co exhibits the larger band bending to enhance the charge separation efficiency, while the in-situ formed CoOOH significantly increases the charge injection efficiency due to the decreased oxygen-evolution overpotentials. As a result, the Ni@Co core-shell nanoparticles coupling with n-Si photoanode can afford the PEC performance with an onset potential of 1.02 V versus reversible hydrogen electrode (RHE), saturated current density of 36.7 mA cm À2 , and retain good stability in K-borate buffer solution. This core-shell structure strategy is efficient and easy to achieve the separation of photogenerated carriers and improve the charge injection efficiency to nearly 100 %[a] J.

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“…X -ray photoelectron spectroscopy demonstratedt hat Fe II playedt he main role in the complex (Figure S9 A). [20] As shown in Figure S9B, the electron spin resonance spectrum of the G4/hemin-NO complexe xhibited the five-coordinate characteristic with a low-spinc onfiguration. [21] In resonanceR amans pectrum,t he stretching frequency around 718 and 1045 cm À1 was assigned to FeÀNO stretching frequency,w hereas the NÀOs tretching mode corresponded to the frequency at 1436 and 1652 cm À1 ( Figure S9C).…”

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confidence: 93%

Single‐Sided Competitive Axial Coordination of G‐Quadruplex/Hemin as Molecular Switch for Imaging Intracellular Nitric Oxide

Zhang

Zhou

et al. 2018

Chemistry A European J

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Axial coordinationi sacrucial biological process to regulate biomolecules' functions in natural enzymes. However,i ti sagreat challenge to determine the single or dual axial interaction between the metal centero fe nzymes and the ligand.I nt his work, ac ontrollable axial coordination system was developed based on G-quadruplex/ hemin complexb yd esigning as eries of fluorescent derivatives. The mechanism on axial coordination of G-quadruplex/hemin with coumarin-imidazolel igandsw as proposed to be single-sided, and led to fluorescenceq uenching of ligands. Upon addition of nitric oxide,t he fluorescence of ligands was recovered through competitive axial coordination, providinga"signal on" strategyf or signal transduction. More significantly, the fluorescent imaging of intracellular nitric oxide was achieved after conjugating with gold nanoparticles. Also, the proposed protocol provided as mart strategy to monitort he relationship between nitric oxide and p53 protein activity in living cells.In naturale nzymes,t he axial coordination between the active site of metalloenzyme and the small biomolecule ligandp lays as ignificant role in regulating biological functions. [1] Inspirationally,c hemists prepared pyridine or imidazole derivatives to axially coordinatet he Fe centero fm etalloporphyrins. Such coordinations tabilizedt he low-spin state of the center metal configuration to imitate the natural enzyme structure. [2] The axial ligands, including chloride, cyanide and nitrate, wereu su-ally coordinated to hemin on both axial sites. [3] However,i n natural enzymes,t he thiolatel igand dominated the fifth coordination position of metal center of hemin, while the sixth position remained open. [4] Therefore, the determinationo fs ingle or dual axial interaction between the metal centero fm etalloporphyrin and the ligand is achallenging endeavor,which usually requires complicated chemical modificationso ft he metalloporphyrin to control the single-sided coordination. [5] To address the problem, af our-stranded nucleic acid structure, G-quadruplex( G4), was introduced to bind tightly with hemin to form specific hemin-binding tertiary structure via intramolecular guanineq uadraplexes. [6] The resulting G4/hemin complex provided one unoccupied axial site on the center Fe in hemin due to the end-stackingatthe terminals of G-quadruplexesa gainst the other positions. [7] In addition, the majority of the hemin in the G4/hemin complex was monomeric,w hich resultedi nam ore reactive activation, compared to the aggregated hemin in aqueous solution. [8] The above advantages could bring new opportunities to decode the mechanism on hemin-based axial interaction. Moreover, the application of the single-sided axial coordinationo fG 4/hemin complexa samolecular switch provided greatp otential in biosensing and intracellular function analysis.Due to the significance of axial Fe-NO interactions on the biologically relevant process of ferriporphyrin, [9] nitric oxide (NO) was taken as am odel for competitive binding of the G4/ hemi...

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Surface characterization of Co/CNx granular films fabricated by nanolamination

Cited by 5 publications

References 0 publications

Multiwalled Carbon Nanotubes Decorated with Cobalt Oxide Nanoparticles

Multiwalled Carbon Nanotubes Decorated with Cobalt Oxide Nanoparticles

High‐Performance and Stable Silicon Photoanode Modified by Crystalline Ni@ Amorphous Co Core‐Shell Nanoparticles

Single‐Sided Competitive Axial Coordination of G‐Quadruplex/Hemin as Molecular Switch for Imaging Intracellular Nitric Oxide

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