【摘要】 超薄二维二氯氧化铌（NbOCl₂）是二维铁电材料家族中新兴的一员，因其表现出极低的层间电子耦合以及显著的激子行为，在电子器件和纳米光子学元件中具有广泛的应用潜力。在本研究中，我们证实了通过液相剥离（LPE）法结合可控离心技术能够成功剥离并实现二维NbOCl₂纳米片剥离制备和有效尺寸筛选。线性吸收光谱响应与纳米片的尺寸密切相关。通过高分辨透射电子显微镜（HRTEM）和拉曼分析进一步分析，成功剥离的纳米片具有较少的缺陷。此外，纳米片在异丙醇（IPA）中表现出优异的的溶剂稳定性，这归因于纳米片表面溶剂壳层的保护作用。我们还研究了纳米NbOCl₂的光热转换响应和光热稳定性。研究结果表明，NbOCl₂具有显著的光热转化特性，其光热转换效率超过30%，表明其在光热治疗和热能转换等领域具有潜在应用价值。更多还原

【Abstract】 Ultrathin 2D niobium oxide dichloride（NbOCl₂） is an emerging member of the 2D ferroelectric material family with extensive potential to provide multifunctionality in electronic devices and nanophotonics elements. It exhibits negligible interlayer electronic coupling and significant excitonic behavior in the bulk state. Here we substantiate that NbOCl₂ nanosheets can be exfoliated and effectively size-selected using controlled centrifugation techniques by the liquid phase exfoliation（LPE） method. Spectroscopic measurements displayed that the variations in dispersion were highly dependent on the nanosheet dimensions. The nanosheets seemed to be comparatively defect-free which will be further corroborated by high resolution transmission electron microscopy（HRTEM） and Raman analysis. The size selected nanosheets are unanticipated stable in isopropyl alcohol（IPA）, possibly owing to the protective influence of a solvation shell. Additionally, the photothermal conversion response and photothermal stability of nanosized NbOCl₂ were investigated. Our finding revealed that NbOCl₂ possesses a robust photothermal agent property, boasting a photothermal conversion efficiency of more than 30%. This underscores its promising potential for various photothermal applications in different fields such as photothermal therapy and thermal energy conversion.更多还原