CrSi₂ Hexagonal Nanowebs

Abstract

Single-crystalline CrSi(2) nanostructures with a unique hexagonal nanoweb morphology have been successfully synthesized for the first time. These nanowebs span 150-200 nm and are composed of <112̅0> nanowire segments with a thickness of 10-30 nm. It is proposed that surface charges on the {101̅0} sidewalls and the minimization of electrostatic energy induce the nanoweb formation. Calculations of the electrostatic energies were used to predict the transitions between different modes of bending, which agreed well with the experimental observations.

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

“…Shape control of crystal growth has been reported for various types of oxide materials by modulating the reactive conditions in the liquid phase [32,33]. In particular, surface charges and polarization have been discussed in previous reports on the synthesis of nanomaterials with some novel morphologies [34,35]. However, the synthesis of crystals with the desired morphologies requires an understanding of the thermodynamic and kinetic mechanisms of the formation of NCs and a framework to guide the selection of environmental conditions.…”

Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries

“…This gives rise to mechanical stresses that lead to cracks and eventual disintegration of the electrode and a failure of the battery [5]. Intermetallic compounds, such as silicides M-Si (with M: Mg [6][7][8], Mn [2,9], Mo [10], Fe [9,11], Ni [12], Nb, Ta, V, Ca, Cr [13,14], and Ti) [1] were first reported by Anani and Huggins as anode materials for Liion batteries [14], especially Mg 2 Si [6] and CrSi 2 [14]. Since, more work have been performed on silicon and silicon-metal alloys; on this regard, two interesting reviews have recently been published on the subject by Park et al [15] and Larcher et al [2].…”

Growth of CrSi2 Nanostructures Using CrCl2 Powder on Si Substrates

“…illustrates that the turning angles about 60 ° are observed in the nanowires. It is estimated that the growth direction of the nanowires with turning angles is parallel to CrSi 2 <11-20> [9].…”

“…Hochbaum et al [8] reported that the Si nanowires with diameters of about 50 nm exhibit 100-fold reduction in thermal conductivity, yielding ZT = 0.6 at room temperature. Recently, various nanostructures of CrSi 2 have been successfully synthesized, such as nanowires, nanowebs, and core-shell nanocables [2][3][9][10]. However, it is important to develop a simple and controllable growth process for the fabrication of the CrSi 2 nanostructures.…”