Effect of thermal annealing on spectral properties of electrodeposited carbon films

Dymont, V. P.; Самцов, М. П.; Nekrashevich, E. M.

doi:10.1134/1.1259746

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The D peak (peak of polycrystalline graphite) indicating the pres ence of sp 3 hybridizations is localized in the vicinity of 1350 cm -1 . The appearance of the D peak in the spec trum after annealing can be explained by the formation of graphitic nanostructures in the film [5]. Determining the ratio of amplitudes of the D and G peaks (I D /I G ) and considering the graph for the dependence I D /I G on N the size of nanocrystalls, which was obtained using the data of X ray scattering [7], the linear size of the nano structures can be estimated (7 nm).…”

Section: Resultsmentioning

confidence: 98%

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Effect of thermal annealing on the properties of a C/Ni heterostructure

Khamdohov

Kulikauskas

et al. 2014

J. Synch. Investig.

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Section: Resultsmentioning

confidence: 98%

“…[4]. Of special interest are the results of investigating the effect of thermal annealing on the properties of carbon films deposited on nickel electrodes [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal annealing on the properties of a C/Ni heterostructure

Khamdohov

Kulikauskas

et al. 2014

J. Synch. Investig.

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“…Such an effect was also observed by other authors. In [22,23], in order to explain the anomalous broadening of lines in the Raman spectra of carbon films, it was suggested to use four gaussian functions to decompose the spectrum. An example of such decomposition for a carbon film deposited in our experiment at a temperature of 500 K using target No.…”

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Effect of the structure of a graphite target on the parameters of carbon films obtained by the laser plasma method

et al. 2008

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We have used Raman light scattering and electron paramagnetic resonance methods to study carbon films obtained by laser plasma deposition, using different types of graphite targets. We have established that the films deposited in this way have a diamond-like structure and are a nanostructured composite containing clusters of both sp 2 and sp 3 -hybridized carbon. We have shown that an increase in structural perfection of the graphite target causes an improvement in the structure of the carbon films obtained from it and an increase in the content of sp 3 -hybridized carbon in it. Thermal stimulation of the substrate during application of a coating leads to the same effect.Introduction. Today there is significant interest in development of technologies for deposition of thin carbon films on various materials. Among the known methods for deposition of such films, an important position is occupied by the method of deposition from a laser ablation plasma under vacuum [1]. Its indisputable advantages include the lack of impurities in the deposited coatings (less than 1%) [2], the relatively easy variation of the deposition parameters (energetics, wavelength of the radiation), the high degree of monitoring of the deposition process (scanning the target with a laser beam, excitation of the substrate), and also the significant content of sp 3 phase in the deposited coatings [3]. Using the laser plasma deposition method, it is possible to obtain various carbon coatings whose structure is determined as nanocrystalline graphite, amorphous carbon, tetrahedral carbon, glassy carbon, metallized carbon, etc.Nevertheless, to date there has been no complete model describing the processes occurring in laser plasma deposition of carbon films. The question of the effect of the deposition conditions on the structure of the coatings obtained is also not completely clear. Most authors have paid special attention to a parameter such as the power density of the laser radiation. In [4,5], it was shown that the fraction of sp 3 -bonded carbon in the films increased as the power density of the laser radiation increased up to 3.7⋅10 8 W/cm 2 . For high power densities, we observe an appreciable decrease in the amount of sp 3 -bonded carbon [5]. In [6], on the other hand, transition from a structure with predominantly sp 2 bonds to a structure with predominantly sp 3 bonds was observed for a power density of ~3⋅10 8 W/cm 2 . Further increase in the power density led to an increase in the fraction of sp 3 -bonded carbon, all the way up to 80%. Despite the difference between the dependences obtained, the authors of all the indicated papers relate the increase in the concentration of sp 3 -bonded carbon when the power density of the laser radiation increases to the increase in the degree of ionization of the carbon plasma as a result of the increase in its temperature. The authors of [5] related the increase in the amount of sp 2 -bonded carbon observed for high power densities to disordering of sp 3 clusters when exposed to particles of the carb...

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“…Therefore, spectra shown in Figure 3 consist of two bands, a G-line at 1579 cm -1 associated to a crystalline graphitic structure and a D-line near 1330 cm -1 accompanied by a D' band at 1612 cm -1 related to a disordered graphitic structure. 16 The ratio of the D-and G-lines intensities (I D /I G ) is used to characterize the defects in carbon nanotubes. Higher I D /I G ratio indicate more structural defects in CNTs.…”

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Different carbon nanostructured materials obtained in catalytic chemical vapor deposition

Veríssimo¹,

Moshkalyo²,

Ramos³

et al. 2006

J. Braz. Chem. Soc.

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Diferentes materiais nanoestruturados à base de carbono, tais como nanotubos, nanofibras, nanomolas e nanooctopus, foram obtidos através do processo de deposição química de vapor. Tais experimentos foram realizados em um forno tubular e variações nos parâmetros experimentais permitiram a obtenção das diferentes nanoestruturas de carbono. Filmes finos de Ni e Cu foram depositados sobre substratos de SiO 2 /Si e empregados como catalisadores. O efeito de diferentes gases precursores de carbono, da temperatura de crescimento e do metal catalítico sobre as características do material final foi investigado por microscopia eletrônica de varredura, espectroscopia Raman e difratometria de raios X com ângulo rasante. O uso dos gases metano e acetileno levaram à formação de nanotubos de carbono para ambos os filmes metálicos, enquanto Ni parcialmente oxidado promoveu o crescimento de nanomolas. Estruturas do tipo octopus foram obtidas a partir do uso de cobre associado a um fornecimento relativamente restrito de metano.Different carbon nanostructured materials, such as nanotubes, nanofibers, nanosprings and nanooctopus, were grown by changing the metal catalyst and experimental parameters of the thermal chemical vapor deposition process. These experiments were performed using a tubular furnace and methane or acetylene as carbon feedstock gases. Thin films of Ni or Cu were deposited onto a SiO 2 /Si substrate and employed as catalysts. The effect of the growth temperature, metal catalyst and carbon gas precursor (methane or acetylene) on the final carbon nanoestructured material was studied by scanning electron microscopy, Raman spectroscopy and grazing incidence X-ray diffraction. Growth of multiwall carbon nanotubes (MWCNTs) was observed using both metal films and carbon precursor gases, whereas partially oxidized Ni films promoted formation of nanosprings. Experiments with reduced supply of methane resulted in octopus-like carbon nanostructures when a Cu film was used as a catalyst.Keywords: carbon nanotubes, carbon nanosprings, carbon nanooctopus, Chemical Vapor Deposition (CVD), metal catalysis IntroductionThe ability of carbon to form strong chemical bonds with itself (in different allotropic forms) and many other elements is responsible for the existence of a vast number of carbon-based materials and compounds. It makes carbon one of the most fascinating building blocks for synthesis of new structures with unique properties. As a consequence, a great variety of carbon nanostructured materials have been grown in many laboratories. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Among the different carbon nanostructures, nanotubes (CNTs) have received much attention due to their extraordinary electronic, mechanical, chemical, optical and other properties. Depending on their structural characteristics, CNTs can exhibit metallic or semiconductor behavior, thus being promising material for designing new nanoelectronic devices, such as field-effect transistors.1,2 Many other potential technological applications can be lis...

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Effect of thermal annealing on spectral properties of electrodeposited carbon films

Cited by 5 publications

References 6 publications

Effect of thermal annealing on the properties of a C/Ni heterostructure

Effect of thermal annealing on the properties of a C/Ni heterostructure

Effect of the structure of a graphite target on the parameters of carbon films obtained by the laser plasma method

Different carbon nanostructured materials obtained in catalytic chemical vapor deposition

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