Supramolecular Semiconductivity through Emerging Ionic Gates in Ion-Nanoparticle Superlattices

28 July 2022, Version 1


The self-assembly of nanoparticles driven by small molecules or ions may produce colloidal superlattices with properties reminiscent of those of metals or semiconductors. However, to what extent the properties of such supramolecular crystals actually resemble those of atomic materials often remains unclear. Here, we present coarse-grained molecular simulations explicitly demonstrating how a behavior evocative of that of semiconductors may emerge in a colloidal superlattice. As a case study, we focus on gold nanoparticles bearing positively charged groups that self-assemble into FCC crystals via mediation of citrate counterions. In silico ohmic experiments show how the dynamically diverse behavior of the ions in different superlattice domains allows the opening of conductive ionic gates above certain levels of applied electric fields. The observed binary conductive/non-conductive behavior is reminiscent of that of conventional semiconductors; however, at a supramolecular level, crossing the “band-gap” requires a sufficient electrostatic stimulus to break the electrostatic interactions and make ions diffuse throughout the superlattice’s cavities.



Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.