Agilent 5991-0781EN Imaging Graphene via Low Voltage Field Emission Scanning Electron Microscopy - Applicati free download

File name 5991-0781EN Imaging Graphene via Low Voltage Field Emission Scanning Electron Microscopy - Applicati

Keysight Technologies Imaging Graphene via Low Voltage Field Emission Scanning Electron Microscopy Application Note Introduction conductivity suggests graphene as graphene, a SEM must have a small an excellent transparent conductive beam spot size corresponding to a high Pursuing novel materials with intriguing electrode in flat panel displays, touch spatial resolution. properties is always an active field screens and cathode ray tubes [4]. In on the horizon of materials science. order for graphene to fulfill this promise 2) Low beam energy One paradigm is graphene which has in large-scale manufacturing of high- The ultra-thin graphene film is attracted enormous passions and performance electronics, high-quality "transparent" to high energy electron stimulated extensive research efforts graphene with large dimensions is beams. Since the preferred imaging all over the world since its discovery needed. Among several techniques for information for SEM is the secondary in 2004 [1]. With a monolayer of sp2- graphene synthesis, chemical vapor electrons generated by the primary bonded carbon atoms arranged in a deposition (CVD) is the most promising beam in the sample, low beam energy is honeycomb crystal lattice, graphene is approach for this purpose owing to the required to image ultra-thin materials. a basic building block for all graphitic high quality of CVD graphene on large Furthermore, low energy SEMs materials, from wrapping up into 0D surface as well as the compatibility minimize beam induced sample damage fullerenes, or rolling into 1D nanotubes, of CVD with current standard wafer- and sample charging of exposed to stacking into 3D graphite. For quite scale lithography and integrated circuit non-conducting materials, which is a long time, such a 2D graphitic layer fabrication processes. ideal for imaging graphene films on had been described as a vintage model insulating substrates. because this structure is not stable in Characterization of graphene films theory [2]. The success of obtaining is essential for the quality control 3) High contrast imaging free-standing graphene, for the first purposes. Common techniques include Many features in graphene are difficult time, by mechanical exfoliation of highly optical microscopy, atomic force to image because of poor contrasts. oriented pyrolytic graphite (HOPG) has microscopy, Raman spectroscopy, A perfect graphene monolayer is immediately entranced both scientists transmission electron microscopy, smooth and featureless making it a in academia trying to underst