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Details of CVD Graphene on TEM Grid

发布时间:2018-01-27 23:48  作者:极品课件站  点击数:

We provide transfer services of TCVD Grown Monolayer Graphene on Cu on top of TEM Grid in order for you to be able to make measurement of Transmission Electron Microscope

Properties of Graphene on TEM Grid

Grid Hole Size63m   Sheet ResistanceAv.< 250~400 /sq  
Lacey Carbon Type-A   Mobility>3500/Vs (Max. 17,000 /Vs  
300 mesh   Transmittance>97%  
Copper Frame   Coverage<30% (PMMA-free), <60% (2-layers)  

Lacey Carbon Type-A

A Lacey carbon film with a removable Formvar backing on the opposite side of the grid. When the Formvar is removed, by dipping in solvent, the Lacey carbon film remains. These films are stable under all EM(electron microscopy) operating conditions and for use where the presence of Formvar can not be tolerated. Pure Lacey Carbon is more delicate than those with Formvar backing and require more careful handling during specimen preparation. Holes are completely open.


Lacey Support Film


Bare TEM Grid

Support Film Product Note, How the Material is Layered on the Grid

Most of the grids used have a distinct shiny” side and dull” side when viewed with the naked eye. Generally, the film type as specified in the product name lies on the shiny side of the grid.

Lacey carbon Type A

The Lacey formvar film is applied to the dull side of the grid and carbon depositied onto the shiny side. When the formvar is removed in solvent the carbon film is left on the shiny side.

Grid Cross Section

Substrate ApplicationCarbon Type-AIs Lacey Film
suitable for this
application?
Applications Requiring Pure Formvar   Not Suitable   No  
Bacterial Suspensions   Best   Yes  
Cell Fragment Suspensions   Best   Yes  
Diffraction Studies   Best   Yes  
EDS (energy dispersive spectrometry)   Best   Yes  
High Resolution Microscopy   Best   Yes  
High Temperature Techniques / Heating Stage   Best   Yes(Type-A)  
Low Magnification Microscopy   Good Alternative   No  
Particulate Suspension, Biological   Best   Yes  
Particulate Suspension, Non-Biological   Best   Yes  
Powders, Dry   Good Alternative   No  
Replicas & Low Temperature Techniques   Good Alternative   Yes(Type-A)  
Thin Sections   Good Alternative   Yes  
Viral Suspensions   Best   Yes  

Measurement data

(d) HR-TEM results showing the atomic lattice structures of RT-CVD graphene. The graphene samples were prepared with holey carbon grid (upper inset). The aberration-corrected scanning TEM image provides an atom-by-atom analysis of graphene (mid inset). The diffraction pattern indicates the corresponding graphene is a highly crystalline monolayer (lower inset).

(e) Graphene domain distribution investigated by selected area diffraction patterns (SADP) and TEM imaging. (f) Graphene boundaries of RT-CVD graphene characterized by dark-field TEM and aberration-corrected HR-TEM images . The left and right parts of the grain boundary are imaged with an aperture at the red and blue circled spots of the diffraction pattern (upper inset).

The atomic image shows that two graphene domains are smoothly connected with an angle of 36° (lower inset). See also Supporting Figure S2 for more dark-field TEM analyses.

Spot 1 (top)

Spot 2 (center)

Spot 3 (bottom)

Figure 4. Grain boundary analyses by TEM and OM. (a-c) Grain boundary mapping of RT-CVD graphene films by TEM corresponding to the sheet resistance of spots 1, 2, and 3 in Figure 3a, respectively. (d-f) Grain boundary mapping of H2O2-treated RT-CVD graphene on Cu foils by optical microscopes, corresponding to the red spots 1, 2, and 3 in Figure 3a, res

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