Interfacial and Defective Construction from Diverse Cu<sub><i>x</i></sub>S<sub><i>y</i></sub> Quantum Dots toward Broadband Carbon-Based Microwave Absorber.
basic_science · Level V
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- Record sourced from PubMed, PMID 39311683.
- Also identified by DOI 10.1021/acsnano.4c09900.
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Abstract
In this study, highly monodisperse copper sulfide (Cu<sub><i>x</i></sub>S<sub><i>y</i></sub>) quantum dots (QDs) have been successfully obtained using a ligand-chemistry strategy, and then a variety of S-deficient Cu<sub><i>x</i></sub>S<sub><i>y</i></sub>/nitrogen-doped carbon (NC) heterointerfaces are constructed by compositional fine-tuning (Cu<sub>9</sub>S<sub>5</sub> → Cu<sub>1.96</sub>S → Cu). First-principles calculations show that the S-deficient domains of Cu<sub><i>x</i></sub>S<sub><i>y</i></sub> QDs and N-doped domains of carbon synergistically enhance the electron transfer from Cu<sub><i>x</i></sub>S<sub><i>y</i></sub> to NC. In addition, the finite element simulations demonstrate that the diverse Cu<sub><i>x</i></sub>S<sub><i>y</i></sub> QDs exhibit their intrinsic size and dielectric confinement effects to precisely manipulate the electric field distortion and improve the relaxation polarization. Consequently, Cu<sub><i>x</i></sub>S<sub><i>y</i></sub>@NC achieves excellent impedance matching and a strong loss mode dominated by dielectric polarization. Among them, Cu<sub><i>x</i></sub>S<sub><i>y</i></sub>@NC-650 has a maximum effective absorption bandwidth of 7.7 GHz at 2.5 mm, while Cu<sub><i>x</i></sub>S<sub><i>y</i></sub>@NC-700 features a minimum reflection loss of -66.7 dB at 13.7 GHz, respectively. Furthermore, the simulations of radar cross-sections have confirmed that the Cu<sub><i>x</i></sub>S<sub><i>y</i></sub>@NC series is promising in the field of radar stealth.