Counting graphene layers with very slow electrons

0443322 - ÚPT 2016 RIV US eng J - Journal Article
Frank, Luděk - Mikmeková, Eliška - Müllerová, Ilona - Lejeune, M.
Counting graphene layers with very slow electrons.
Applied Physics Letters. Roč. 106, 09 JAN (2015), 013117:1-5. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA TA ČR(CZ) TE01020118; GA MŠMT(CZ) LO1212
Institutional support: RVO:68081731
Keywords : graphene * ultralow energy STEM * counting graphene layers * cleaning of graphene * 2D crystals
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering
Impact factor: 3.142, year: 2015

The study aimed at collection of data regarding the transmissivity of freestanding graphene for electrons across their full energy scale down to the lowest energies. Here, we show that the electron transmissivity of graphene drops with the decreasing energy of the electrons and remains below 10 percent for energies below 30 eV, and that the slow electron transmissivity value is suitable for reliable determination of the number of graphene layers. Moreover, electrons incident below 50 eV release adsorbed hydrocarbon molecules and effectively clean graphene in contrast to faster electrons that decompose these molecules and create carbonaceous contamination.
Permanent Link: http://hdl.handle.net/11104/0246044