Understanding the Metal-Carbon Interface in FePt Catalyzed Carbon Nanotubes

Pohl, Darius; Schäffel, Franziska; Rümmeli, Mark H.; Mohn, E.; Täschner, Christine; Schultz, L.; Kisielowski, Christian; Rellinghaus, Bernd

doi:10.1103/physrevlett.107.185501

Cited by 25 publications

(21 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our case, since the 1.2 nm and 1.6 nm carbon films were extremely thin (comprising just a few atomic layers), we expect the direct interaction of FCVA-deposited carbon with Co and Pt in the media, which promotes sp 2 C bonding mainly at the interface region due to the catalytic effect. Moreover, by analyzing the TEM images, we observed the formation of a nano-crystalline layered structure in the CM3a/12C sample, which may be rich in the sp 2 phase mainly at the interface353637383940. This explains why a lower sp 3 C bonding with a fraction of ~33% was observed in sample CM3a/12C.…”

Section: Discussionmentioning

confidence: 79%

“…Both Co and Pt are the transition metals having high adsorption characteristics and are considered as excellent catalysts. As evidence of this, recently, Pohl et al 39 performed a study on FePt/carbon interfaces and found that FePt catalyzed the formation of carbon nanotubes (CNTs), which have the sp 2 bonded structure. Bethune et al 40 also reported that Co catalyzed the formation of sp 2 bonded graphite-like structures around the Co clusters.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Probing the Role of an Atomically Thin SiNx Interlayer on the Structure of Ultrathin Carbon Films

Dwivedi

Rismani-Yazdi

Yeo

et al. 2014

Sci Rep

View full text Add to dashboard Cite

Filtered cathodic vacuum arc (FCVA) processed carbon films are being considered as a promising protective media overcoat material for future hard disk drives (HDDs). However, at ultrathin film levels, FCVA-deposited carbon films show a dramatic change in their structure in terms of loss of sp3 bonding, density, wear resistance etc., compared to their bulk counterpart. We report for the first time how an atomically thin (0.4 nm) silicon nitride (SiNx) interlayer helps in maintaining/improving the sp3 carbon bonding, enhancing interfacial strength/bonding, improving oxidation/corrosion resistance, and strengthening the tribological properties of FCVA-deposited carbon films, even at ultrathin levels (1.2 nm). We propose the role of the SiNx interlayer in preventing the catalytic activity of Co and Pt in media, leading to enhanced sp3C bonding (relative enhancement ~40%). These findings are extremely important in view of the atomic level understanding of structural modification and the development of high density HDDs.

show abstract

Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Probing the Role of an Atomically Thin SiNx Interlayer on the Structure of Ultrathin Carbon Films

Dwivedi

Rismani-Yazdi

Yeo

et al. 2014

Sci Rep

View full text Add to dashboard Cite

show abstract

“…To this purpose it is intended to use a MEMS actuation device for the mechanical loading inside a transmission electron microscope. Using low-voltage and aberration-corrected high-resolution TEM [53] Pohl et al imaged carbon and metal atoms at the interface of a CNT and a catalyst FePt particle. Also integration of MEMS actuation devices to perform in situ mechanical tests inside a transmission electron microscope were already reported (e.g.…”

Section: In Situ Tem Investigationsmentioning

confidence: 99%

Towards nanoreliability of sensors incorporating interfaces between single-walled carbon nanotubes and metals: molecular dynamics simulations and in situ experiments using electron microscopy

et al. 2016

View full text Add to dashboard Cite

“…Using low-voltage and aberration-corrected high-resolution TEM, Pohl et al imaged carbon and metal atoms at the interface of a CNT and a catalyst FePt particle [24]. Also integration of MEMS actuation devices to perform in situ mechanical tests inside a transmission electron microscope were already reported (e.g.…”

Section: In Situ Tensile Test Stage Chipmentioning

confidence: 99%

An in situ tensile test device for thermo-mechanical characterisation of interfaces between carbon nanotubes and metals

Hartmann

Bonitz

Heggen

et al. 2016

2016 17th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and

View full text Add to dashboard Cite

In this paper we present our recent efforts to develop an in situ tensile test device for thermo-mechanical characterization of interfaces between single-walled carbon nanotubes (SWCNTs) and metals. For the mechanical tests, the chosen loading condition is a pull-out test. After summarizing results of maximum stresses calculated from molecular dynamics simulations and obtained from in situ scanning electron microscope experiments we outline the requirement for an in situ experimental method with atomic resolution to study the mechanics of SWCNT-metal interfaces in further detail. To this purpose, we designed, fabricated and characterized a silicon-based micromechanical test stage with a thermal actuator for pull-out tests inside a transmission electron microscope. The objective is to obtain in situ images of SWCNT-metal interfaces under mechanical loads at the atomic scale for fundamental structure investigation. The design of this MEMS test stage permits also the integration of SWCNTs by wafer level technologies. First experiments with this MEMS test stage confirmed the presence of suspended thin metal electrodes to embed SWCNTs. These suspended thin metal electrodes are electron transparent at the designated SWCNT locations. Actuator movements were evaluated by digital image correlation and we observed systematic actuator movements that allow for a defined load application of SWCNTS. Although significant image drifts occured during actuation, we achieved atomic resolution of the metal electrode and stable movement in the focal plane of the electron microscope. The presented system may be also used and further developed for in situ characterization of other materials

show abstract

Understanding the Metal-Carbon Interface in FePt Catalyzed Carbon Nanotubes

Cited by 25 publications

References 44 publications

Probing the Role of an Atomically Thin SiNx Interlayer on the Structure of Ultrathin Carbon Films

Probing the Role of an Atomically Thin SiNx Interlayer on the Structure of Ultrathin Carbon Films

Towards nanoreliability of sensors incorporating interfaces between single-walled carbon nanotubes and metals: molecular dynamics simulations and in situ experiments using electron microscopy

An in situ tensile test device for thermo-mechanical characterisation of interfaces between carbon nanotubes and metals

Contact Info

Product

Resources

About