Correlation between structural change and electrical transport properties of Fe-doped chrysotile nanotubes under high pressure

Abstract

Fe doped chrysotile nanotubes (NTs) have been synthesized under controlled hydrothermal conditions, and have been characteristic of layered-walls and room-temperature ferromagnetism. High-pressure in situ impedance spectra and synchrotron XRD measurements are performed on Fe-doped chrysotile NTs to reveal the electrical transport and structural properties under compression. Sample resistance (R ) was found to increase with the pressure elevation, accompanying the step decrease in the grain boundary relaxation frequency (f), which reflects the bandgap broadening and dipoles polarization weakening due to the application of pressure. Furthermore, it is found that both R and f change their pressure dependences at ~5.0 GPa, which is attributed to the nonlinear compressibility of c-axis and even the underlying lattice distortion of monoclinic structure obtained in the XRD observations.

Facile synthesis and characterization of Chrysotile/SnO2 nanocomposite for enhanced photocatalytic properties

“…The chrysotile/SnO 2 nanocomposite was prepared by calcining the preparation product, chrysotile/SnO 2 , as illustrated in Figure 1. The successful deposition of Sn (OH) 4 on the chrysotile surfaces involved the surface OH − groups of halloysite nanotubes which connected with Sn 2+ ions through the H-O-Sn 2+ coordination bond. The product was calcinated for 2 hr at 500 C to prepare chrysotile/SnO 2 nanocomposites.…”

“…Some studies have shown that coupling chrysotile with semiconductors or metals to form composite photocatalysts can expand them the potential application fields by adding new functionality. [4,5] And coupling chrysotile with semiconductors or metals to form composite photocatalysts can enhanced photocatalytic properties. Such as Wu et al have synthesized TiO 2 /chrysotile composite catalyst in which the TiO 2 works as an active site for pollutant degradation.…”