Chemical Bath Deposition of Copper Sulfide on Functionalized SAMs: An Unusual Selectivity Mechanism

Langmuir : the ACS Journal of Surfaces and Colloids
Jenny K HedlundAmy V Walker

Abstract

We have investigated the chemical bath deposition (CBD) of CuS using thioacetamide on functionalized self-assembled monolayers (SAMs) using scanning electron and optical microscopies, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry. For all SAMs studied, the amount of CuS deposited is strongly dependent on the bath pH and can be attributed to the interaction of the SAM terminal groups with the chalcogenide ions present in solution. For -CH3-terminated SAMs, there is a steady increase in the amount of CuS deposited with an increase in the bath pH because there is an increase in the concentration of chalcogenide ion. However, for -OH- and -COOH-terminated SAMs, we observe that the maximum amount of CuS is deposited at pH 10. We attribute this behavior to a competition between the repulsion of the chalcogenide ions by the negatively charged SAM terminal groups and an increase in the chalcogenide ion concentration with an increase in the bath pH. Using the interaction of the chalcogenide ions with the different SAM terminal functional groups, we demonstrate that CuS can be selectively deposited on the -CH3-terminated areas of patterned -OH/-CH3- and -COOH/-CH3-terminated SAMs.

References

Jul 25, 2008·Nano Letters·Yue WuA Paul Alivisatos
Mar 10, 2009·Journal of the American Chemical Society·Yixin ZhaoClemens Burda
Feb 15, 2011·Journal of Colloid and Interface Science·Yongjuan LuJunhong Jia
Aug 23, 2011·Nature Nanotechnology·Jinyao TangPeidong Yang
Sep 23, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Peng LuAmy V Walker
May 24, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Jing Yang, Amy V Walker
Jan 15, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Zhiwei Shi, Amy V Walker
Apr 16, 2016·Science·Albert PolmanWim C Sinke

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