@article{Liu2025, 
author = {Minjie Liu and Ziqian Ma and Letian Huang and Xiao Zhang and Zheng Ma and Chunling Zhu and Xitian Zhang and Yujin Chen},
title = {Asymmetrically coordinated niobium single atoms on porous carbon nanoflowers for effective electromagnetic wave absorption},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {8},
pages = {94907602},
keywords = {electromagnetic wave absorption, niobium single atoms, asymmetrical coordination structure, multiple functional film},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907602},
doi = {10.26599/NR.2025.94907602},
abstract = {In this study, porous carbon nanoflowers (PCF) are synthesized using MIL-101-NH2 as the precursor, and niobium single atoms (Nb-SAs) are anchored on the PCF via ion adsorption and high-temperature pyrolysis processes (Nb-SA/PCF). Structural characterization and density functional theory (DFT) calculations demonstrate an asymmetric coordination environment of Nb-SA, with three in-plane nitrogen atoms from the graphene and two axially oriented oxygen atoms coordinating each niobium center (NbN3O2). This asymmetric NbN3O2 enhances charge transfer and increases the dipole moment, thereby significantly improving polarization loss. Consequently, the Nb-SA/PCF-based film exhibits an effective absorption bandwidth of 6.00 GHz at a thickness of 2.0 mm. Moreover, the film demonstrates outstanding mechanical strength, flexibility, thermal insulation, and hydrophobicity, broadening its potential for operational applications in demanding environments.}
}