Large piezoelectric and thermal expansion coefficients with negative Poisson's ratio in strain-modulated tellurene

Abstract

Two dimensional (2D) chalcogenide monolayers have diversified applications in optoelectronics, piezotronics, sensor and in energy harvesting. Group-IV Tellurene monolayer is one such emerging material in the 2D family for its...

Theoretical design and discovery of two‐dimensional materials for next‐generation flexible piezotronics and energy conversion

“…For example, β-Tellurene is a centrosymmetric structure with no 4b). This high piezoelectricity is owed to small elastic constants accompanied with high Born effective charges under the effect of strain [28]. Similar pattern of variation of piezoelectric constants can be observed for uniaxially strained SnSe [92].…”

“…On the contrary, MoS 2 , BN and SnSe follow the odd-even rule with nonzero piezoelectricty for odd number of layers and zero for even numbered layers due to the alternate restoration of centrosymmetry. However, F I G U R E 4 (a) Piezoelectric trend of strain coefficient d 11 of pristine and Janus TMDs monolayers with anion-cation polarizabilities ratio (data from Blonsky and colleagues [65,72,75]) and Groups III-V, II-VI semiconductor monolayers with anion-cation polarizabilities ratio added linearly to the product of Bader charge (Q) and lattice constant (a 0 ) (data from Blonsky and colleagues [65,66]) (b) Strain modulated in-plane piezoelectricity in Tellurene monolayer [28]. TMD, transition metaldichalcogenide.…”

Bonding, structure, and mechanical stability of 2D materials: the predictive power of the periodic table

“…With its smaller stiffness and larger Poisson's ratio, rhombic tellurene is softer and more flexible than rhombic selenene (see Table 13). The maximum stiffnesses of anisotropic tetragonal selenene and tellurene are 31 N m À1 251 and 20.4 N m À1 , 259 respectively. While for the rhombic phase the ultimate strengths agree with the E/10 rule, this is not the case for tetragonal tellurene.…”

“…Moreover, helix-to-layer transformations from 1D trigonal to 2D tetragonal phases can be induced by mechanical strain. 247 The currently available mechanical properties, which are limited to tetragonal 251 and rhombic [252][253][254] selenene as well as trigonal, 247 tetragonal, 258,259 and rhombic 252,258 tellurene, are shown in Table 13. The dependence of the Young's moduli and ultimate strengths on the bond lengths of the tetragonal and rhombic structures of selenene and tellurene is presented in Fig.…”

Biomass-derived cellulose nanofibers and iron oxide-based nanohybrids for thermal insulation application

“…CNF has been recently used as a building material to fabricate CNF-based nanohybrids, which have demonstrated promising properties for various applications. [23][24][25][26][27][28][29][30] There are several advantages in developing CNF-based nanohybrids as thermal insulation materials: (1) due to the nanobrous structure of CNF, it may result in a high surface area that acts as a phonon barrier to prevent heat conduction. 31 (2) CNF display organic functional groups on the surface, which can promote the modication of the CNF with different inorganic materials by different non-covalent interactions.…”