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Designing a sensor based on a π-conjugated 6-membered boron ring and its properties

Zihan Zhang1, Rajeev Ahuja1,2, and Wei Luo1,*

  • *Contact author: wei.luo@physics.uu.se

Phys. Rev. Materials 9, 064002 – Published 11 June, 2025

DOI: https://doi.org/10.1103/y1wh-fjp3

Abstract

Planar π-conjugated borides not only attract fundamental interests in bonding chemistry, but also offers wide-ranging applications in catalysis, bioimaging, and biosensing. To stabilize π-conjugated B6 rings without out-of-plane bonding, we propose a design strategy that involves inserting low-compressible CN3 triangles into tessellation of B6 rings to create planar borides. Based on this concept, we designed the planar hypercoordinate boride ScCN3B6, which features the planar structure and represents a theoretically predicted π-conjugated B6 ring. The molecular dynamics simulations suggested that B6 rings in ScCN3B6 remain intact at a high temperature of 1500 K. The metal adsorption energy of B6 rings in ScCN3B6 is comparable to borophene, and superior to that of graphene and two-dimensional hexagonal boron nitride. As a result, the designed ScCN3B6 demonstrates both high stability and chemical activity attributed to CN3 triangles and B6 rings, respectively. Consequently, the designed ScCN3B6 could serve as a potential sensor for biomolecules. Moreover, the planar ninefold hypercoordinate Sc weakly bonds to the N3B6 wheel, drives a flat band of the dz2 orbital, suggesting that flat band can be generated by splitting of dz2 orbital in planar hypercoordinate crystal field.

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