Localized resistance measurements of wrinkled reduced graphene oxide using in-situ transmission electron microscopy

Nilsson, Hanna; Knoop, Ludvig de; Cumings, John; Olsson, Eva

doi:10.1016/j.carbon.2016.10.086

Cited by 12 publications

(7 citation statements)

References 37 publications

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“…From the TEM image Fig. 1a it can be seen that the GO, like wrinkled paper, is very thin and homogeneous [10]. These wrinkles may be important for preventing aggregation of GO and maintaining high surface area.…”

Section: Results and Discussion:-mentioning

confidence: 98%

Electrochemical Detection of Picric Acid Using Glassy Carbon Electrode Modified Reduced Graphene Oxide by Single-Drop Microextraction Method.

Ihuomah¹,

Ihuoma²,

Sonaimuthu³

2018

IJAR

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The reduced graphene oxide composite-modified glassy carbon electrode (rGO/GCE) was developed as a simple, selective and sensitive electrochemical sensor for determination of picric acid (PA). The rGO was obtained by reduction of graphene oxide obtained via Hummer's method. The synthesised rGO was characterized using Fourier transform infrared spectroscopy (FTIR) and transmission Electron microscopy (TEM). GCE was modified with rGO and the electrochemical properties of the bare and modified electrode were investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results obtained showed that the modified electrode exhibited more excellent electrochemical properties than the bare GCE. The optimum conditions for detection of PA in water using CV and EIS were as follows: deposition potential at 100 mV/s, pH 2, and 0.5 M H 2 SO 4 was used as supporting electrolyte. The linear regression equation obtained was I (μA) = 0.6432C + 7.2359 and the detection limit were calculated to be 0.65 μg L −1 .

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Section: Results and Discussion:-mentioning

confidence: 98%

Electrochemical Detection of Picric Acid Using Glassy Carbon Electrode Modified Reduced Graphene Oxide by Single-Drop Microextraction Method.

Ihuomah¹,

Ihuoma²,

Sonaimuthu³

2018

IJAR

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“…The influence of the tip/semiconductor rectifying contact can be eliminated by performing the fit at higher voltages (as shown in Figure S5 ) where the I – V curve is vastly dominated by the resistive behavior of the GaInP:Sb layer. 44 …”

Section: Resultsmentioning

confidence: 99%

“…Three I – V curve measurements were acquired for each sample, moving slightly the position of the tip for each measurement in order to minimize the effect of variations in the quality of the tip/sample contact in the resistance calculations. The influence of the tip/semiconductor rectifying contact can be eliminated by performing the fit at higher voltages (as shown in Figure S5) where the I – V curve is vastly dominated by the resistive behavior of the GaInP:Sb layer …”

Section: Resultsmentioning

confidence: 99%

“…The influence of the tip/semiconductor rectifying contact can be eliminated by performing the fit at higher voltages (as shown in Figure S5) where the I−V curve is vastly dominated by the resistive behavior of the GaInP:Sb layer. 44 The degree of anisotropy in the electrical conductivity was calculated as the ratio between the mobility in the [110] oriented sample and the mobility of the [1−10] oriented sample, as is schematized in Figure 3b. The mobility (μ) in each crystal direction and its ratio were calculated from resistivity (ρ) values and dopant concentration (N A ).…”

Section: ■ Resultsmentioning

confidence: 99%

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Understanding the Anisotropy in the Electrical Conductivity of CuPt_B-type Ordered GaInP Thin Films by Combining In Situ TEM Biasing and First Principles Calculations

Martín

Coll

López‐Conesa

et al. 2022

ACS Appl. Electron. Mater.

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In this work, the effect of CuPt B ordering on the optoelectronic properties of Ga 0.5 In 0.5 P is studied by combining in situ transmission electron microscopy measurements and density functional theory (DFT) calculations. GaInP layers were grown by metal organic vapor phase epitaxy with a CuPt B single-variant-induced ordering due to the intentional misorientation of the Ge(001) substrate. Moreover, the degree of order was controlled using Sb as the surfactant without changing other growth parameters. The presence of antiphase ordered domain boundaries (APDBs) between the ordered domains is studied as a function of the order parameter. The in situ electrical measurements on a set of samples with controlled degree of order evidence a clear anisotropic electrical conductivity at the nanoscale between the [110] and [1–10] orientations, which is discussed in terms of the presence of APDBs as a function of the degree of order. Additionally, DFT calculations allow to determine the differences in the optoelectronic properties of the compound with and without ordering through the determination of the dielectric function. Finally, the anisotropy of the electrical conductivity for the ordered case is also discussed in terms of the effective mass calculated from the band structure on specific k -paths. By comparing the experimental measurements and the theoretical calculations, two factors have been presented as the main contributors of the electric conductivity anisotropy of CuPt B -type ordered GaInP thin films: antiphase boundaries that separate domains with uniform order (APDBs) and the anisotropy of the effective mass due to the alternating of In/Ga rich planes.

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“…However, with increasing GO content, it can observed in Figure 3(d) that buckling/wrinkling of the GO sheets is evident, particularly in the overlapping region similar to literature. 30 The mechanical shear forces applied to flexible GO layers during the melt processing permits the exfoliation of lower than 1 wt.% of GO layers into a viscous polymer melt by overcoming p-p interactions and Van der Waals forces. However, at 2 wt.% of GO addition to LLDPE may induce strong p-p stacking and layers buckling/wrinkling due to thermal heating and high local mechanical stresses applied.…”

Section: Resultsmentioning

confidence: 99%

Effect of graphene oxide as a filler material on the mechanical properties of LLDPE nanocomposites

Günister

Barsoum

2019

Journal of Composite Materials

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Graphene oxide (GO) has high aspect ratios than many nanosize fillers such as carbon nanotubes and clay, besides its better mechanical properties than many polymers; so they are preferred as a filler material in polymer matrix composites. In this study, the effect of GO on the mechanical properties of linear low-density polyethylene (LLDPE) were experimentally investigated. LLDPE-GO nanocomposites were prepared by melt compounding method, and the extruded nanocomposite was shaped by injection molding machine for the mechanical tests. The mechanical properties investigated included tensile properties, fatigue properties, as well as hardness properties. Differential scanning calorimeter (DSC) was employed to study the thermal characterization of the composites. The results revealed that the addition of GO nanosheets indeed had a positive effect on the tensile, fatigue, and hardness properties. The tensile strength, Young's modulus, and Shore D hardness value were increased by 27.4%, 31.3%, and 9%, respectively, with a GO loading ranging from 0 wt.% to 2 wt.%. The addition of GO had a significant effect on the fatigue properties of the composites such as nearly exponential increment in the cyclic numbers. The samples with 2 wt.% of GO could endure up to 106 cycles during the tests, which is 100 times that of pure LLDPE. The morphological analysis via X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated that GO nanosheets were well exfoliated in the LLDPE matrix. However, there is no significant effect on the melting temperature, crystallization temperature and crystallinity of LLDPE based on DSC result.

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Localized resistance measurements of wrinkled reduced graphene oxide using in-situ transmission electron microscopy

Cited by 12 publications

References 37 publications

Electrochemical Detection of Picric Acid Using Glassy Carbon Electrode Modified Reduced Graphene Oxide by Single-Drop Microextraction Method.

Electrochemical Detection of Picric Acid Using Glassy Carbon Electrode Modified Reduced Graphene Oxide by Single-Drop Microextraction Method.

Understanding the Anisotropy in the Electrical Conductivity of CuPt_B-type Ordered GaInP Thin Films by Combining In Situ TEM Biasing and First Principles Calculations

Effect of graphene oxide as a filler material on the mechanical properties of LLDPE nanocomposites

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Localized resistance measurements of wrinkled reduced graphene oxide using in-situ transmission electron microscopy

Cited by 12 publications

References 37 publications

Electrochemical Detection of Picric Acid Using Glassy Carbon Electrode Modified Reduced Graphene Oxide by Single-Drop Microextraction Method.

Electrochemical Detection of Picric Acid Using Glassy Carbon Electrode Modified Reduced Graphene Oxide by Single-Drop Microextraction Method.

Understanding the Anisotropy in the Electrical Conductivity of CuPtB-type Ordered GaInP Thin Films by Combining In Situ TEM Biasing and First Principles Calculations

Effect of graphene oxide as a filler material on the mechanical properties of LLDPE nanocomposites

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Understanding the Anisotropy in the Electrical Conductivity of CuPt_B-type Ordered GaInP Thin Films by Combining In Situ TEM Biasing and First Principles Calculations