Structure of inorganic nanocrystals confined within carbon nanotubes

Sandoval, Stefania; Flahaut, Emmanuel

doi:10.1016/j.ica.2019.04.004

Cited by 19 publications

(13 citation statements)

References 81 publications

(108 reference statements)

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“…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 ]…”

Section: Nanoscale Cylindrical Poresmentioning

confidence: 99%

Crystallization in Confinement

2020

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Many crystallization processes of great importance, including frost heave, biomineralization, the synthesis of nanomaterials, and scale formation, occur in small volumes rather than bulk solution. Here, the influence of confinement on crystallization processes is described, drawing together information from fields as diverse as bioinspired mineralization, templating, pharmaceuticals, colloidal crystallization, and geochemistry. Experiments are principally conducted within confining systems that offer well‐defined environments, varying from droplets in microfluidic devices, to cylindrical pores in filtration membranes, to nanoporous glasses and carbon nanotubes. Dramatic effects are observed, including a stabilization of metastable polymorphs, a depression of freezing points, and the formation of crystals with preferred orientations, modified morphologies, and even structures not seen in bulk. Confinement is also shown to influence crystallization processes over length scales ranging from the atomic to hundreds of micrometers, and to originate from a wide range of mechanisms. The development of an enhanced understanding of the influence of confinement on crystal nucleation and growth will not only provide superior insight into crystallization processes in many real‐world environments, but will also enable this phenomenon to be used to control crystallization in applications including nanomaterial synthesis, heavy metal remediation, and the prevention of weathering.

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Section: Nanoscale Cylindrical Poresmentioning

confidence: 99%

Crystallization in Confinement

2020

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“…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.…”

Section: Filling and Washing Of Arc-discharge Swcntsmentioning

confidence: 99%

“…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.…”

Section: Filling and Washing Of Arc-discharge Swcntsmentioning

confidence: 99%

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

Santidrián

Kierkowicz

Pach

et al. 2020

Phys. Chem. Chem. Phys.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Sandoval

2021

Front. Bioeng. Biotechnol.

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We have employed fullerenes as versatile agents to “cork” the open tips of multiwalled carbon nanotubes (MWCNTs), and as promoting species for the release of the inorganic material filled within the nanotubes’ cavities. High Z element compounds, namely, PbI2, ZnI2, and CeI3, were chosen to easily determine the presence of the filler inside the hosting nanotubes by transmission electron microscopy (TEM). Fullerenes can isolate inorganic nanostructures confined within the hollow cavities of MWCNTs, which allows the removal of the external material remnant after the filling. Otherwise, taking advantage of the affinity of fullerenes with selected solvents, we have confirmed the ability of the C60 molecules to promote the displacement of the inorganic guest from the host. We propose two different strategies to trigger the release, employing vapor and liquid phase treatments. The first protocol involves annealing filled MWCNTs in presence of fullerenes (to obtain C60PbI2@MWCNTs) and the subsequent washing of the sample in ethanol under mild conditions. On the other hand, the simultaneous introduction of the C60 molecules and the liberation of the guest are produced by a single step wet procedure; the latter being potentially useful when materials that are not stable at high temperatures are employed for filling.

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Structure of inorganic nanocrystals confined within carbon nanotubes

Abstract: OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible.

Cited by 19 publications

References 81 publications

Crystallization in Confinement

Crystallization in Confinement

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

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

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