Although these thiols have different chain lengths (from 12 carbons in the backbone for DDT to 18 carbons for ODT), the inter-layer distance stays the same. These results are in stark contrast with the assumption that the improvement in the dispersion is caused by the presence of thiols on the surface. From this observation, two possible conclusions can be drawn: either the surface is exclusively passivated by OAm, or there is a mixture of OAm and thiols. In both cases, the inter-layer distance would be dictated by the presence of OAm, and thus the following characterizations have been performed to exclude the presence of any residual thiols.