Kinetics of PbCrO4 Nanorod Growth by Oriented Attachment at the Air−Water Interface

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• 作者：Ranjit R. Hawaldar ; Shivaram D. Sathaye ; Arti Harle ; R. S. Gholap ; Kashinath R. Patil
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：May 22, 2008
• 年：2008
• 卷：112
• 期：20
• 页码：7557 - 7561
• 全文大小：454K
• 年卷期：v.112,no.20(May 22, 2008)
• ISSN：1932-7455

文摘

Oriented attachment is a new way of crystal growth to transform preformed nanoparticles into hierarchical assemblies. Here, we demonstrate the use of liquid−liquid interfaces toward the formation of PbCrO₄ nanoparticles and their subsequent time-dependent self-assembly at the air−water interface into nanorods by oriented attachment. EDAX and XPS analysis indicate the formation of stoichiometric PbCrO₄. TEM studies at different stages of aging reveal that the transformation from nanoparticles to nanorods is kinetically governed. HRTEM analysis indicates nanorod growth along the [110] plane. UV−visible spectra reveal the presence of peaks at 425 and 515 nm for nanorods, while for the nanoparticle sample, a single peak at 425 nm is evident. As formation of ultrathin films over a large area (typically equal to or greater than 1µm × 1µm) concomitantly accompanies this approach, it can be extended to other materials as well for nanostructured device applications.