Blocking of the 1T-to-2H Phase Transformation of Chemically Exfoliated Transition Metal Disulfides by Using a “Lattice Lock”
Publication date: Available online 9 November 2018
Source: Nano Energy
Author(s): Sieun Chae, Soo Sang Chae, Min Choi, Hye min Park, Hyunju Chang, Jeong-O Lee, Tae Il Lee
The last decade has witnessed the rapid increasing of research on two-dimensional (2D) transition metal disulfides (TMDs) as an attractive materials in various applications due to its superior charge carrier mobility levels, high surface-to-volume ratios, and extreme flexibility. However, its phase instability among those polymorphism, especially phase transformation from 1 T phase to 2 H phase, has so far been limited by a significant degradation in device performance. Here we develop, for the first time, a novel and effective way to prevent the phase transition of MS2, and thereby enhance the stability of its 1 T phase characteristics. We introduce ZnO nanocrystals on 1 T phase MoS2 nanosheets and investigate the effects of this ZnO decoration on the stability of the 1 T phase MoS2 nanosheets. Finally, we apply this lattice-lock concept to a thermoelectric application of TMDs, where the phase transformation of 1 T TMDs to 2 H is a major bottleneck to providing stable TMD-based thermoelectric devices.
A lattice structure of the wurtzite zinc oxide (0001) plane which is crystallographically matched on the (0001) plane of 1 T phase MoS2 acts as a lock to inhibit the transformation toward 2 H phase MoS2. This lattice-lock concept can apply to a thermoelectric application of TMDs, where the phase transformation of 1 T TMDs to 2 H is a major bottleneck to providing stable TMD-based thermoelectric devices.
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