期刊
ACS NANO
卷 3, 期 2, 页码 370-378出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn800441y
关键词
molecular devices; solar cells; selective deposition; chemical bath deposition; zinc sulfide; self-assembled monolayers
类别
资金
- National Science Foundation [CHE-058063]
We have investigated the chemical bath deposition (CBD) of ZnS on functionalized alkanethiolate self-assembled monolayers (SAMs) using time-of-flight secondary ion mass spectrometry and scanning electron microscopy. The reaction mechanism involves both cluster-by-duster and ion-by-ion growth. The dominant reaction pathway is dependent on both the SAM terminal group and the experimental conditions. On - COOH-terminated SAMS, two types of crystallites are observed: similar to 500 nm nanoflowers formed by ion-by-ion growth, and larger similar to 2 mu m crystallites formed by cluster-by-cluster deposition. The nanoflowers nucleate at Zn2+-carboxylate surface complexes. On - OH- and - CH3-terminated SAMs, only the larger crystallites are formed. These do not adhere strongly to the SAM surface and can be easily removed. Finally, we demonstrate that under appropriate experimental conditions ZnS selectively deposits on the - COOH-terminated SAM regions of - COOH/-CH3-patterned SAM surfaces, forming nanoscale flowerbeds.
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