Oriented Attachments and Formation of Ring-on-Disk Heterostructure Au–Cu3P Photocatalysts

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• 作者：Anirban Dutta ; Sumit K. Dutta ; Shyamal K. Mehetor ; Indranil Mondal ; Ujjwal Pal ; Narayan Pradhan
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：March 22, 2016
• 年：2016
• 卷：28
• 期：6
• 页码：1872-1878
• 全文大小：496K
• ISSN：1520-5002

文摘

Oriented attachments have been extensively studied as an effective method for the formation of large crystals from seed nanocrystals. However, this has been limited mostly to seeds of single-phase materials. In contrast, in this work, oriented attachment of two types of nanocrystals with differences in size, shape, phase, and physical as well as chemical properties is reported. Noble metal (Au) nanoparticles were observed to be crystallographically oriented along the preferred direction on semiconducting Cu₃P disks and further annealed to obtain intriguing ring-on-disk metal–semiconductor heterostructures. This was triggered using PH₃ gas, which bridged the metal Au particles and Cu₃P disk. The phosphine chemistry underlying the formation of such heterostructures was elucidated by carrying out several control reactions and analyzing the intermediate products. Because of their optically active nature and dual plasmon effects, these heterostructures were applied as photocatalyst for hydrogen evolution from water, and their efficiency was evaluated.