Materials Science and Engineering, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Adv Mater. 2019 Apr;31(14):e1806860. doi: 10.1002/adma.201806860. Epub 2019 Feb 14.
This study demonstrates the first synthesis of MXene-derived ferroelectric crystals. Specifically, high-aspect-ratio potassium niobate (KNbO ) ferroelectric crystals is successfully synthesized using 2D Nb C, MXene, and potassium hydroxide (KOH) as the niobium and potassium source, respectively. Material analysis confirms that a KNbO orthorhombic phase with Amm2 symmetry is obtained. Additionally, ferroelectricity in KNbO is confirmed using standard ferroelectric, dielectric, and piezoresponse force microscopy measurements. The KNbO crystals exhibit a saturated polarization of ≈21 µC cm , a remnant polarization of ≈17 µC cm , and a coercive field of ≈50 kV cm . This discovery illustrates that the 2D nature of MXenes can be exploited to grow ferroelectric crystals.
本研究展示了 MXene 衍生铁电晶体的首次合成。具体而言，使用二维 NbC、MXene 和氢氧化钾（KOH）分别作为铌和钾源，成功合成了高纵横比的铌酸钾（KNbO ）铁电晶体。材料分析证实获得了具有 Amm2 对称的 KNbO 正交相。此外，使用标准铁电、介电和压电力显微镜测量证实了 KNbO 中的铁电性。KNbO 晶体表现出约 21 µC cm 的饱和极化、约 17 µC cm 的剩余极化和约 50 kV cm 的矫顽场。这一发现表明可以利用 MXenes 的二维性质来生长铁电晶体。
