Thermally induced atomic and electronic structure evolution in nanostructured carbon film by in situ TEM/EELS analysis

Jian, Nan; Xue, Peidong; Diao, Dongfeng

doi:10.1016/j.apsusc.2019.143831

Cited by 17 publications

(10 citation statements)

References 45 publications

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“…For the i-irradiated carbon films with the ion excitation and etching effect [28], the surfaces were flat with small asperities, and values were all around 0.1 nm with different irradiation energies. While for the e-irradiated carbon films, since the temperature during film deposition was much higher [48], the roughness changed a lot with different irradiation energies, the maximum roughness of 7.1 nm appeared with substrate bias of +20 V, and then the roughness decreased to 2.2 nm with the increasing of electron irradiation energy increased to +80 V. The elastic modulus and hardness of the sp 2 nanocrystallited carbon films also showed great difference for the electron and ion irradiated films due to the differences of nanostructure (shown in Fig. 7(b)).…”

Section: In-situ Tem Nanofriction Propertiesmentioning

confidence: 98%

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

Fan

Huang

2022

Friction

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Carbon films with two different kinds of sp2 nanocrystallited structure were investigated to study the stick-slip friction with the in-situ and ex-situ tests. In-situ transmission electron microscope (TEM) observation and nanofriction tests revealed that the origins of stick and slip varied with shear stress and film deformation. At the stick stage, shear stress gradually increased with the contact strengthened until reached the shear strength to break the interfacial adhesion; at the slip stage, the shear stress decreased and accompanied with film deformation. During the sliding process, adhesive deformation resulted in the large stick-slip step while ploughing deformation led to a smoother step. Ex-situ nanofriction tests on a series of sp2 nanocrystallited carbon films with different irradiation energies showed the expected sliding behavior with the in-situ results. This study first clarified the mechanism of stick-slip friction with the in-situ TEM observation, which plays the important role for the micro and nano application of sp2 nanocrystallited carbon films.

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Section: In-situ Tem Nanofriction Propertiesmentioning

confidence: 98%

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

Fan

Huang

2022

Friction

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“…bias (Figure 3a-d), [4c,d,18] the cryogenic holder (Figure 3e), [19] and the in situ heating (Figure 3f). [20] Specifically, the in situ bias rigs include the electrochemical liquid open cell (Figure 3a), [4c] the electrochemical solid-state open cell (Figure 3b,d), [18] and the electrochemical liquid close cell (Figure 3c). [4d] Attributed to them, the TEM imaging and corresponding EELS spectra of battery materials are now achievable not only under different thermodynamics conditions but also in a variety of dynamic environments (e.g., electrochemical solid/liquid or solid/solid systems, heating, cryogenic, etc.…”

Section: Emerging Advanced Eels Configurations For Battery Studiesmentioning

confidence: 99%

“…A similar MEMS-type chip can likewise be employed to conduct the in situ heating with a matching holder (Figure 3f). [20,24] Since 2017, the cryo-TEM has been developed to study the battery materials, with Cui and co-workers being the first to use it. [19] The cryo-TEM holder's low temperature of <100 K allows the observation of the instable species under the electron beam, such as the Li dendrites, solid electrolyte interphase, etc.…”

Section: Emerging Advanced Eels Configurations For Battery Studiesmentioning

confidence: 99%

Advanced Electron Energy Loss Spectroscopy for Battery Studies

Yin

Zhao

et al. 2021

Adv Funct Materials

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As a powerful tool for chemical compositional analyses, electron energy loss spectroscopy (EELS) can reveal an abundance of information regarding the atomic-level electron state in a variety of materials, including the elemental types as well as their valence and concentration distributions, and the structure-related atom radial distribution. Benefiting from its unique capabilities and the newly developed advanced transmission electron microscope (TEM) configurations (i.e., in situ bias, in situ heating, cryo-TEM, etc.), EELS has facilitated the battery studies in various aspects. Here, a brief introduction of EELS is provided. Thereafter, a description of the recent progress in studying battery materials using EELS is provided, and finally a look ahead on the future development of EELS techniques and their applications in battery studies is provided.

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“…During the film deposition, the ion irradiation energy was fixed to 20 eV, which indicates the films were grown with the low energy ion excitation effect [28]. On the other hand, to prevent the heating effect that compromises sp 2 nanocrystallite formation, the temperature was monitored, and it was much lower than the onset temperature of 200 °C for the sp 3 -to-sp 2 conversion process [33]. Therefore, the structural difference was due to the ion irradiation density.…”

Section: Friction Testsmentioning

confidence: 99%

Multiscale frictional behaviors of sp2 nanocrystallited carbon films with different ion irradiation densities

Fan

Chen

2020

Friction

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sp2 nanocrystallited carbon films with large nanocrystallite sizes, smooth surfaces, and relative high hardness were prepared with different ion irradiation densities regulated with the substrate magnetic coil current in an electron cyclotron resonance plasma sputtering system. Their multiscale frictional behaviors were investigated with macro pin-on-disk tribo-tests and micro nanoscratch tests. The results revealed that, at an ion irradiation density of 16 mA/cm2, sp2 nanocrystallited carbon film exhibits the lowest friction coefficient and good wear resistant properties at both the macroscale and microscale. The film sliding against a Si3N4 ball under a contact pressure of 0.57 GPa exhibited a low friction coefficient of 0.09 and a long wear life at the macroscale. Furthermore, the film sliding against a diamond tip under a contact pressure of 4.9 GPa exhibited a stable low friction coefficient of 0.08 with a shallow scratch depth at the microscale. It is suggested that sp2 nanocrystallites affect the frictional behaviors in the cases described differently. At the macroscale, the contact interface via the small real contact area and the sp2 nanocrystallited transfer layer dominated the frictional behavior, while the sp2 nanocrystallited structure in the film with low shear strength and high plastic resistivity, as well as the smooth surface morphology, decided the steady low nanoscratch properties at the microscale. These findings expand multiscale tribological applications of sp2 nanocrystallited carbon films.

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Thermally induced atomic and electronic structure evolution in nanostructured carbon film by in situ TEM/EELS analysis

Cited by 17 publications

References 45 publications

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

Advanced Electron Energy Loss Spectroscopy for Battery Studies

Multiscale frictional behaviors of sp2 nanocrystallited carbon films with different ion irradiation densities

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