@article{Liu2026, 
author = {Haolin Liu and Jidong Liu and Di Wu and Junzi Li and Haibo Gan and Zhen He and Jiaqi Zhu and Yuting Sun and Junqi He and Tingchao He and Qiaoyan Hao and Wenjing Zhang},
title = {Chemical vapor transport synthesis of 2D pentagonal PdSe2 with in-plane optical and electrical anisotropy},
year = {2026},
journal = {Nano Research},
keywords = {chemical vapor transport, pentagonal PdSe2, nonlinear, anisotropy, variable thickness},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94909039},
doi = {10.26599/NR.2026.94909039},
abstract = {Two-dimensional (2D) PdSe2 has garnered sustained interest due to its unique puckered pentagonal lattice, which endows it with nonlinear optical activity, strong in-plane anisotropy, sizable bandgap, and environmental stability. However, the advancement of this system toward optoelectronic device applications has been limited by the lack of reliable direct-growth routes for high-quality 2D PdSe2 crystals with regulated thickness. In this paper, we report the bottom-up growth of few-layer and multilayer 2D PdSe2 nanosheets on sapphire substrates via a growth-parameter-regulated chemical vapor transport reaction. The high quality of the as-grown PdSe2 nanosheets is confirmed by aberration-corrected scanning transmission electron microscopy images and low-frequency Raman spectroscopy. We further investigate the strong optical anisotropy of PdSe2 nanosheets using the second-harmonic generation response and angle-resolved polarized Raman spectroscopy. Moreover, electrical transport measurements reveal large anisotropic ratios of 4.9 for electrical conductivity and 6.3 for carrier mobility. This work opens a new route for the synthesis of variable-thickness 2D pentagonal materials and establishes PdSe2 as an excellent candidate for polarization-sensitive optoelectronic devices.}
}