In 2015, a new two-dimensional carbon allotrope named penta-graphene (PG), was reported as metastable based
on theoretical calculations. This means that PG represents a local minimum in the potential energy surface and it
sustains binding energy slightly less negative than the ones displayed by graphite and diamond. PG is formed by
pentagonal rings of carbon atoms with sp2 or sp3 hybridization, and they are organized in a pattern known as Cairo
pentagonal tiling. In addition, PG was obtained experimentally from the exfoliation of the T12-carbon phase. In
2017, a group of scientists successfully synthesized the few-layered PdSe2 (FL-PdSe2) from bulk crystals, a
pentagonal 2D layered noble transition metal dichalcogenide with a puckered morphology that is air-stable. They
confirmed that the field-effect transistors made from the FL- PdSe2 display tunable ambipolar charge carrier
conduction with a high electron field-effect mobility, indicating the promise of this anisotropic, air-stable,
pentagonal 2D material for electronic devices. In this work, we investigated the structural and electronic properties
of p-PdSe2 nanoribbons (p-PdSe2NRs) using density functional theory (DFT). Herein, we propose a series of new
p-PdSe2NRs by cutting p-PdSe2 sheets. Our first-principles calculations show that such p-PdSe2NRs are
energetically stable and a semiconductor excludes sawtooth-sawtooth p-PdSe2NR. These findings provide useful
insight into a novel material structure in low-dimensional material systems for potential nanoelectronics.