碳量子点诱导的多形碳酸钙粒子矿化及其形成机理

CDs-Induced Polymorphous CaCO Mineralization and Formation Mechanism

以在不同的热处理温度下合成的具有可变化学结构的碳点(CDs)为添加剂调控合成矿物碳酸钙。在室温条件下合成了花生状、哑铃状和球形碳酸钙颗粒。用扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)、荧光光谱仪(PL)和X射线衍射仪(XRD)对样品进行了表征,详细研究了碳酸钙双球粒子的生长过程。CDs表面随处理温度可调变的极性官能团(主要为羧基、醛基、羟基等)被认为是导致合成碳酸钙粒子形貌变化的原因。对碳酸钙双球粒子的生长机理研究表明,Ostwald成熟和定向聚集机制是在CDs存在下最终双球粒子形貌形成的驱动力。

Carbon dots(CDs)with various chemical structures can be obtained under the condition of different heattreat temperatures.The morphology and phase of CaCO3 has been successfully controlled by the as-prepared CDs.Peanut-like,dumbbell-like and sphere-like particles were prepared in the presence of CDs.The CDs with change-able chemical structures,such as carboxyl group,aldehyde group,hydroxyl group,were deemed to be responsiblefor the variation in morphology.The as-obtained samples were characterized by scanning electron microscope(SEM),Fourier transform infrared spectrometer(FTIR),photoluminescence(PL)and X-ray diffraction(XRD).Thegrowth mechanism of CaCO3 twin sphere particles was investigated in detail.Ostwald ripening and oriented aggrega-tion mechanisms were proposed to be the drive power of the final morphology formation in the presence of CDs.