形貌可控金属膦酸盐纳米杂化材料的制备及表征

Preparation and Characterization of Metal Phosphate Nano-hybrid Materials with Controlled Morphology

摘要:

摘要：本文在无模板剂条件下，以三种不同的金属前体——氢氧化铝、氢氧化铁和醋酸锌分别与苯基膦酸和二苯基次膦酸通过水热反应制备了纳米棒和纳米片层两种形貌的纳米次膦酸金属杂化材料。材料结构通过傅立叶红外光谱仪、X射线粉末衍射表征，证明了Me—O—P (Me=Al, Fe, Zn)结构和π−π堆积的存在。材料形貌通过扫描电镜表征，观察到两种截然不同的形貌——纳米棒和纳米片层结构。结果表明，次膦酸前体结构在很大程度上决定了纳米结构的维度，不同金属中心对纳米结构维度的影响较小。双羟基官能度膦酸倾向于生成层状纳米结构，而单羟基官能度膦酸易于生成棒状纳米结构。热重分析数据表明，当膦酸配体引入到杂化材料中，其热稳定性大幅度提高。

Abstract:

Abstract: Metal phosphonates nanosheets and nanorods were prepared from the reaction of three metal precursors, including aluminium hydroxide, ferric hydroxide and zinc acetate, with phenyl or diphenyl phosphonates without the assistance of templates. Structures of materials were characterized by Fourier transform infrared (FTIR) spectra, thermogravimetric analysis (TGA), scanning electron microscopy(SEM), powder X-ray diffraction (XRD), demonstrated a structure of Me—O—P(Me=Al, Fe, Zn) main chains and the existence of π−π stacking, which enabled the assembly into nanorod and nanosheets. The results show that the dimension of nanostructure is largely determined by phosphonate precursors rather than metal centers. Two-hydroxyl functionality tends to generate a layered nanostructure, while one-hydroxyl functionality results in nanorod structure. TGA spectra show that when organophosphonic ligands are incorporated into the hybridized materials, their thermal stability is significantly improved.