不对称的二进制纳米晶体的种子生长由半导体TiO2棒状部分和磁性玛-Fe2O3球形域组成.

Raffaella Buonsanti¹, Vincenzo Grillo, Elvio Carlino

¹Dipartimento di Chimica, Università di Bari, via Orabona 4, I-70126 Bari, Italy.

Journal of the American Chemical Society

|December 21, 2006

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合成的不对称二元纳米晶体 (BNCs) 结合了二氧化 (TiO2) 和氧化铁 (Fe2O3) 以一种新的生长机制. 这些独特的纳米材料在催化和医学中具有先进应用的潜力.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
固态化学固态化学

背景情况:

二元纳米晶体 (BNCs) 通过结合不同的材料领域提供可调节的特性.
控制界面和增长机制对于BNC的功能至关重要.
二氧化 (TiO2) 和氧化铁 (Fe2O3) 是具有互补性质的技术相关材料.

研究的目的:

合成由TiO2和玛-Fe2O3.3组成的不对称的二元纳米晶体 (BNCs).
为了研究这些BNCs的新型异质表皮生长机制.
描述合成的BNCs的结构,组成和磁性特性.

主要方法:

铁氧化物在三元表面活性剂混合物中对TiO2纳米棒进行异质核化.
使用粉末X射线衍射,拉曼光谱,莫斯尔光谱,HAADF-STEM和HRTEM进行表征.
通过交流感应度测量进行磁性属性评估.

主要成果:

成功合成了不对称的BNCs与c轴延长的解剖酶TiO2和球形的玛-Fe2O3域.
确定了一种新的生长机制,涉及到一个受限制的,曲的结节,可以容纳界面应变.
证明了依赖大小的磁性行为,并证实了BNC的组成和结构.

由于独特的接口,观察到不合适脱位形成的延迟.

结论:

这种新的异质生长机制使得能够创建高度集成的BNCs.
这些TiO2-Fe2O3 BNC具有适用于先进应用的组合性质.
潜在的应用包括光催化,癌症治疗和纳米晶体组装.

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科学领域:

背景情况:

研究的目的:

主要方法:

主要成果:

结论: