Optical and electrical properties of nonstoichiometric a-Ge1−xCx films prepared by magnetron co-sputtering

Zhu, Jiaqi; Jiang, Chunzhu; Han, Jiecai; Yu, Hailing; Wang, J.Z.; Zhang, Jia; Chen, R.R.

doi:10.1016/j.apsusc.2011.12.051

Cited by 18 publications

(7 citation statements)

References 23 publications

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“…The representative FTIR spectra from the nanowires showed absorption bands at ∼568, ∼610, and ∼737 cm –1 (see Figure 1 e). These bands have previously been assigned to the stretching modes of C–Ge–C, 39 Ge–C 40 bonds, and wagging mode of Ge–H 3 , 41 41 respectively. The FTIR peak at ∼890 cm –1 is related to Ge–CH 3 rocking vibrations.…”

Section: Resultsmentioning

confidence: 90%

One-Step Grown Carbonaceous Germanium Nanowires and Their Application as Highly Efficient Lithium-Ion Battery Anodes

Garcia

Biswas

McNulty

et al. 2022

ACS Appl. Energy Mater.

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Developing a simple, cheap, and scalable synthetic method for the fabrication of functional nanomaterials is crucial. Carbon-based nanowire nanocomposites could play a key role in integrating group IV semiconducting nanomaterials as anodes into Li-ion batteries. Here, we report a very simple, one-pot solvothermal-like growth of carbonaceous germanium (C-Ge) nanowires in a supercritical solvent. C-Ge nanowires are grown just by heating (380–490 °C) a commercially sourced Ge precursor, diphenylgermane (DPG), in supercritical toluene, without any external catalysts or surfactants. The self-seeded nanowires are highly crystalline and very thin, with an average diameter between 11 and 19 nm. The amorphous carbonaceous layer coating on Ge nanowires is formed from the polymerization and condensation of light carbon compounds generated from the decomposition of DPG during the growth process. These carbonaceous Ge nanowires demonstrate impressive electrochemical performance as an anode material for Li-ion batteries with high specific charge values (>1200 mAh g –1 after 500 cycles), greater than most of the previously reported for other “binder-free” Ge nanowire anode materials, and exceptionally stable capacity retention. The high specific charge values and impressively stable capacity are due to the unique morphology and composition of the nanowires.

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Section: Resultsmentioning

confidence: 90%

One-Step Grown Carbonaceous Germanium Nanowires and Their Application as Highly Efficient Lithium-Ion Battery Anodes

Garcia

Biswas

McNulty

et al. 2022

ACS Appl. Energy Mater.

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“…The specimens irradiated with 4 MeV Cu 2+ and 9 MeV Cu 3+ ions with 10 15 and 10 16 ions/cm 2 fluences exhibit a broad Raman mode centered at approximately 1430 cm −1 that cannot be deconvolved into D and G modes. Even though the amorphous carbon Raman response usually consists of D and G modes, there are cases where the Raman response of amorphous carbon is a single mode centered around 1430 cm −1 3031323334353637. This peak is usually observed in silicon carbide30313335 or germanium-carbon compounds32343637, and always in irradiated or sputtered specimens.…”

Section: Resultsmentioning

confidence: 99%

“…in amorphous silicon carbide, and it was confirmed that this Raman mode originated from homonuclear carbon bonds. It has been attributed to both sp 2 -bonded carbon (but not in graphitic six-fold rings)37 and sp 3 -bonded3436 carbon. Previous theoretical studies using an embedded-ring approach (ERA)38, and first principles density functional theory (DFT)39, have predicted a Raman mode at 1444 cm −1 due to either the vibrational mode of a five or seven member sp 2 -bonded ring or linearly aggregated graphitic six-fold rings.…”

Section: Resultsmentioning

confidence: 99%

Ion irradiation induced structural modifications and increase in elastic modulus of silica based thin films

Shojaee

Wang

et al. 2017

Sci Rep

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Ion irradiation is an alternative to heat treatment for transforming organic-inorganic thin films to a ceramic state. One major shortcoming in previous studies of ion-irradiated films is the assumption that constituent phases in ion-irradiated and heat-treated films are identical and that the ion irradiation effect is limited to changes in composition. In this study, we investigate the effects of ion irradiation on both the composition and structure of constituent phases and use the results to explain the measured elastic modulus of the films. The results indicated that the microstructure of the irradiated films consisted of carbon clusters within a silica matrix. It was found that carbon was present in a non-graphitic sp2-bonded configuration. It was also observed that ion irradiation caused a decrease in the Si-O-Si bond angle of silica, similar to the effects of applied pressure. A phase transformation from tetrahedrally bonded to octahedrally bonded silica was also observed. The results indicated the incorporation of carbon within the silica network. A combination of the decrease in Si-O-Si bond angle and an increase in the carbon incorporation within the silica network was found to be responsible for the increase in the elastic modulus of the films.

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“…This refers to the presence of the oxygen ions as well as the functional groups, like OH, of PVA. In region (I), the ion transport may occur through hopping, while in the region (II), ions (1) (T) = 0 exp −ΔE K B T may transfer via tunneling [24,25]. The conduction hopping mechanism is due to the process of abrupt charge carrier's displacement from one localized site to others.…”

Section: Electrical Investigationsmentioning

confidence: 99%

Structural, electrical and radiation shielding properties of polyvinyl alcohol doped with different nanoparticles

Rashad

Hanafy

Issa

2020

J Mater Sci: Mater Electron

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Both pure and doped polyvinyl alcohol (PVA) with 1 wt% of Ni, NiO and Fe 2 O 3 nanoparticles (NPs) were prepared using the casting method. The structural and electrical properties of the composite were extensively studied. Moreover, the radiation shielding of these composites was studied. XRD results prove the semi-crystalline structure of pure PVA because of crystalline and amorphous phases are appeared. The electrical conductivity (σ dc) and current-voltage (I-V) characterization for all PVA samples have been an investigation. The separation (R) and energy of hopping (W) were calculated. Also, the temperature dependence of the conductivity for all pure samples was investigated using Mott's variable-range hopping model. The obtained results suggest strongly the applicability of these samples in the electronic applications. Furthermore, radiation shielding parameters have been calculated. Results show that PVA with 1% Ni sample has the highest values of mass attenuation coefficient, effective atomic number, fast neutrons removal cross-sections and absorption neutron scattering cross-section among other samples.

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Optical and electrical properties of nonstoichiometric a-Ge1−xCx films prepared by magnetron co-sputtering

Cited by 18 publications

References 23 publications

One-Step Grown Carbonaceous Germanium Nanowires and Their Application as Highly Efficient Lithium-Ion Battery Anodes

One-Step Grown Carbonaceous Germanium Nanowires and Their Application as Highly Efficient Lithium-Ion Battery Anodes

Ion irradiation induced structural modifications and increase in elastic modulus of silica based thin films

Structural, electrical and radiation shielding properties of polyvinyl alcohol doped with different nanoparticles

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