journal article·2025-01-28

Downscaling of Non-Van der Waals Semimetallic W5N6 with Resistivity Preservation

Hongze Gao, Da Zhou, Lu Ping, Zifan Wang, Nguyen Tuan Hung, Jun Cao, Michael Geiwitz, Gabriel Natale, Yuxuan Cosmi Lin, Kenneth Stephen Burch, Riichiro Saito, Mauricio Terrones, Xi Ling

ACS Nano· Volume 19· Issue 3
Publisher page

Abstract

The bulk phase of transition metal nitrides (TMNs) has long been a subject of extensive investigation due to their utility as coating materials, electrocatalysts, and diffusion barriers, attributed to their high conductivity and refractory properties. Downscaling TMNs into two-dimensional (2D) forms would provide valuable members to the existing 2D materials repertoire, with potential enhancements across various applications. Moreover, calculations have anticipated the emergence of uncommon physical phenomena in TMNs at the 2D limit. In this study, we use the atomic substitution approach to synthesize 2D W 5 N 6 with tunable thicknesses from tens of nanometers down to 2.9 nm. The obtained flakes exhibit high crystallinity and smooth surfaces. Electrical measurements on 15 samples show an average electrical conductivity of 161.1 S/cm, which persists while thickness decreases from 45.6 to 2.9 nm. The observed weak gate-tuning effect suggests the semimetallic nature of the synthesized 2D W 5 N 6 . Further investigation of the conversion mechanism elucidates the crucial role of chalcogen vacancies in the precursor for initiating the reaction and strain in propagating the conversion. Our work introduces a desired semimetallic crystal to the 2D material library with mechanistic insights for future design of the synthesis.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: MXene and MAX Phase Materials · Boron and Carbon Nanomaterials Research · Inorganic Chemistry and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, Boston University, 590 Commonwealth Ave., Boston, Massachusetts 02215, United States

Department of Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802, United States

Division of Materials Science and Engineering, Boston University, 15 St Mary’s St., Boston, Massachusetts 02215, United States

Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan

Department of Physics, Boston College, 140 Commonwealth Ave., Chestnut Hill, Massachusetts 02467, United States

Department of Materials Science and Engineering, Texas A&M University, 575 Ross St., College Station, Texas 77843, United States

Department of Physics, Tohoku University, Sendai 980-8578, Japan

Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan

Department of Chemistry, The Pennsylvania State University, 77 Pollock Rd., State College, Pennsylvania 16801, United States

Department of Materials Science and Engineering, The Pennsylvania State University, 116 Deike Building, University Park, Pennsylvania 16802, United States

Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, Pollock Rd, University Park, Pennsylvania 16802, United States

Funding

Division of Chemistry · Basic Energy Sciences · Air Force Office of Scientific Research · Japan Society for the Promotion of Science · Division of Electrical, Communications and Cyber Systems · Ministry of Education, Taiwan

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