Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 47, Pages 20167-20172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp108018f
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Funding
- National Science Foundation [CMMI-0748094]
- 3M Corporation
- American Chemical Society [46510G5]
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Using cyclic voltammetry, we studied the reductive desorption of a series of low-density self-assembled monolayers (LD-SAMs) made from mercaptohexadecanoic acid (MHA). Desorption experiments indicate that LD-SAMs are significantly less stable than a full MHA monolayer. All three LD-SAMs investigated presented a broad desorption peak in the region between -1.0 and -0.8 V vs SCE, which is in contrast to the single peak with a narrow distribution at -1.11 V observed for the full MHA monolayer. Upon backfilling the LD-SAM with a shorter-chain thiol (mercaptohexanol), the desorption of the mixed monolayer displayed a single peak, indicative of a well-mixed monolayer. Our results show that LD-SAMs are promising candidates for mixed monolayers and suggest that the broad desorption peak observed for LD-SAMs might arise due to adsorption at different binding sites.
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