Chemical Bath Deposition of ZnO on Functionalized Self-Assembled Monolayers: Selective Deposition and Control of Deposit Morphology
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- 作者：Zhiwei Shi ; Amy V. Walker
- 刊名：Langmuir
- 出版年：2015
- 出版时间：February 3, 2015
- 年：2015
- 卷：31
- 期：4
- 页码：1421-1428
- 全文大小：444K
- ISSN：1520-5827
文摘
We have developed a method by which to selectively and reproducibly deposit ZnO films on functionalized self-assembled monolayers (SAMs) using chemical bath deposition (CBD). The deposition bath is composed of zinc acetate and ethylenediamine. The deposition reaction pathways are shown to be similar to those observed for sulfides and selenides, even though ethylenediamine acts as both an oxygen source and a complexing agent. On 鈭扖OOH terminated SAMs, Zn鈥揷arboxylate surface complexes act as nucleation sites for ion-by-ion growth, leading to the formation of adherent ZnO nanocrystallites. Cluster-by-cluster growth is also observed, which produces weakly adherent micrometer-sized ZnO crystallites. On 鈭扖H3 and 鈭扥H terminated SAMs, only micrometer-sized ZnO crystallites are observed because Zn2+ does not complex with the SAM terminal group, preventing nucleation of the nanocrystalline phase. The application of either ultrasound (鈥渟onication-assisted CBD鈥? or stirring promotes ion-by-ion ZnO growth on 鈭扖OOH terminated SAMs. Stirring produces smoother but less reproducible ZnO films than sonication-assisted CBD.