Structure of inorganic nanocrystals confined within carbon nanotubes

Abstract

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Crystallization in Confinement

“…Early studies focused on filling nanotubes with metals, [ 225–227 ] metal oxides, [ 228–232 ] metal carbides, [ 226,233,234 ] and metal salts, [ 235–237 ] where these and subsequent studies have been summarized in a number of review articles. [ 238–240 ] Similar experiments have also been carried out using alternative nanotubes including the formation of single crystal nanowires of potassium halides in BN nanotubes, [ 241 ] PbI 2 in BN, [ 242 ] MoS 2 , [ 242 ] and WS 2 nanotubes, [ 243 ] and CsI in WS 2 nanotubes. [ 244 ]…”

Charge transfer in steam purified arc discharge single walled carbon nanotubes filled with lutetium halides

“…The observed shift of breathing modes of the LuCl 3 @pSWCNTs, LuBr 3 @pSWCNTs and LuI 3 @pSWCNTs towards higher and lower frequencies as well as the significant changes in the intensity as compared with the pSWCNTs may be associated with a doping effect. [30][31][32][33][34][35][36] The RBM band positions in the spectra of LuI 3 @pSWCNTs are more significantly shifted than those of the LuCl 3 @pSWCNTs and LuBr 3 @pSWCNTs. In addition, the bands that are in resonance via E 11 M transitions present higher shifts in the frequencies, comparing LuX 3 @pSWCNTs (X = Cl, Br, I) with pSWCNTs, because the metallic tubes are more sensitive to doping.…”

“…The G-band frequency shifts observed between pSWCNTs and LuX 3 @pSWCNTs (X = Cl, Br, I) can be attributed to doping effects, as we already mentioned in the analyses of the RBM. [30][31][32][33][34][35][36] Comparing the spectra of the pristine and filled samples, a weak shift of the G-band to both higher (blueshift) and lower (redshift) frequencies was observed. The contribution of Gmetallic is the most shifted one because it is more sensitive to doping.…”

Encapsulation of Fullerenes: A Versatile Approach for the Confinement and Release of Materials Within Open-Ended Multiwalled Carbon Nanotubes

“…The presence and nature of the guest material into the hollow cavities can alter the properties of the hosting template, improving its optical and electrical behavior ( del Carmen Giménez-López et al, 2011 ). Moreover, the confinement into a small area might notably alter the morphology, chemical and structural characteristics of the guest, leading to the formation of new crystalline structures ( Marega and Bonifazi, 2014 ; Sandoval et al, 2019 ). The hollow cavities of CNTs are useful not only as nanoscale templates for the synthesis of nanocomposites or nanostructures, but also provide an alternative toward isolating functional molecules from external environments, preventing any undesirable interaction with outer species that can modify the properties of the inner material or even produce the degradation of its structure.…”