Reflectivity spectra and dielectric function of stage-1 donor intercalation compounds of graphite

Li Intercalation into Graphite: Direct Optical Imaging and Cahn–Hilliard Reaction Dynamics

“…With increasing Li concentration, the Drude plasma edge shifts into the visible from the infrared. [19][20][21][22] Stage 3 is green, stage 2 is red, and stage 1 is golden; these assignments are confirmed by in-situ Raman spectroscopy (supporting information) and agree well with previous reports 23 . The entire intercalation sequence is reversible if voltage is reduced to zero.…”

“…This process created disk shaped graphite crystals of 50m diameter. Their thickness was larger than 100nm, the optical skin depth in graphite, 19 as confirmed by the absence of Si modes in measured Raman spectra. Ti contacts was defined by a second round of e-beam lithography and deposited by e-beam evaporation.…”

Low-energy plasmonic structure in CaC6

“…This feature can be classified as a conventional π plasmon also presented in pristine graphite at ω πp ≈ 7 eV 19,20,39,56 and in the GICs at lower energies. [19][20][21][22][23][24][25] The redshift of the πp plasma frequency in CaC 6 in comparison with the plasmon frequency in pure graphite can be explained by the presence of a broad peak centered at 4.6 eV at small Q's in the imaginary part of seen in Figs. 2(c) and 3(c).…”

“…[15][16][17][18] The collective electronic excitations, to the best of our knowledge, were neither investigated in YbC 6 nor in CaC 6 . At the same time, there exist a rich literature [19][20][21][22][23][24][25][26] on this topic for other GICs. Thus in a variety of these compounds, modifications of the low-energy π plasmon mode existing in pure graphite at the 7-12 eV energy range were observed [27][28][29] resulting in a plasmon frequency shift to lower energies.…”

Electronic properties of pristine and modified single-walled carbon nanotubes

“…¢ÞÎÑ ÒÓÑAEÇÏÑÐÔÕÓËÓÑÄÂÐÑ, ÚÕÑ ÏÂÍÔËÏÂÎßÐÂâ ÔÕÇ-ÒÇÐß ÎÇÅËÓÑÄÂÐËâ ÒÓË ËÐÕÇÓÍÂÎËÓÑÄÂÐËË ÜÇÎÑÚÐÞØ ÏÇ-ÕÂÎÎÑÄ (K, Rb, Cs) ÔÑÑÕÄÇÕÔÕÄÖÇÕ àÏÒËÓËÚÇÔÍÑÌ ×ÑÓÏÖÎÇ MC 8 [180], ÚÕÑ ÔÑÄÒÂAEÂÇÕ Ô ÏÂÍÔËÏÂÎßÐÞÏ ÖÓÑÄÐÇÏ ÎÇÅËÓÑÄÂÐËâ ÅÓÂ×ËÕ ÍÂÎËÇÏ (KC 8 ) [170,214] Ë ÐÇÔÍÑÎß-ÍÑ ÑÕÎËÚÂÇÕÔâ ÑÕ ÄÇÎËÚËÐÞ Ä ÔÎÖÚÂÇ ×ÖÎÎÇÓÇÐÑÄ (K 6 C 60 ) [215]. ±ÓË ÎÇÅËÓÑÄÂÐËË ÎËÕËÇÏ Ä ÊÂÄËÔËÏÑÔÕË ÑÕ ÔÒÑÔÑàÔËÐÕÇÊ ÏÂÍÔËÏÂÎßÐÂâ ÍÑÐÙÇÐÕÓÂÙËâ ÏÇÕÂÎÎÂ Ä ÐÂÐÑ-ÕÓÖÃÍÂØ ÔÑÑÕÄÇÕÔÕÄÖÇÕ àÏÒËÓËÚÇÔÍÑÌ ×ÑÓÏÖÎÇ LiC 6 [183,190] ËÎË Li 1Y2 C 6 [178].…”