High‐pressure behavior of Ni‐filled and Fe‐filled multiwalled carbon nanotubes

Abstract

The high-pressure behavior of Ni-filled and Fe-filled multiwalled carbon nanotubes has been investigated up to 27 GPa and 19 GPa, respectively, with the help of synchrotron-based angle-dispersive X-ray diffraction. These nanotubes do not show any structural transformation up to the highest pressures studied. These results are similar to that of Co-filled nanotubes [1], but are in sharp contrast to the earlier results on Fefilled tubes [2], where the tubes were found to undergo a sudden collapse of intertube separation. Our present observations suggest that the occurrence of an isostructural phase transition in Fe 3 C, observed in our earlier study, may be responsible for the structural transition in nanotubes in that case.

Compression of nanomaterials under pressure

“…With the help of synchrotron-based angle dispersive Xray diffraction, the high pressure behaviour of Ni and Fe filled multiwalled carbon nanotubes was investigated by Poswal et al [8] up to pressures of 27 and 19 GPa, respectively. These nanotubes do not show any structural transformation, even at the highest pressures studied.…”

First phase commissioning of high pressure XAFS setup at ED-XAFS beamline, Indus-2 synchrotron radiation source, India

“…Understanding structural changes of materials under high pressure have direct bearing on contemporary practical applications since nano-sized systems are inherently subject to high surface pressure. Problems of our current interest include high pressure transitions (0-40GPa) in Negative Thermal Expansion (NTE) materials [23][24][25],Fe-based superconductors [26,27], perovskites (BiFeO 3 [28], BaLiF 3 [29], Sr 2 MgWO 6 [30]), pyrochlores (Yb 2 Ti 2 O 7 [31], LaHf 2 O 7 [32], Rare earth oxides (Dy 2 O 3 [33], CeO 2 [34], CeVO 4 [35], Nd 2 O 3 [36]), metal-filled carbon nanotubes [37], Zn(CN) 2 [38].…”

Pressure Dependent Volume Change in Some Nanomaterials Using an Equation of State

“…Fullerenes or hollow carbon nanospheres were discovered in the year 1985 [13], and have since been a topic of substantial research interest. The high pressure behaviour of carbon nanotubes (CNT) has been investigated up to 19 GPa with the help of synchrotron based angle dispersive X-ray diffraction [14]. The CNT do not show any structural transformation even up to very high pressure.…”