Electrochemical Formulation Maps for Multinary Chalcogenide Nanocrystal Inks and Polymer Coatings
Year: 2026
Type: preprint
Abstract: Polymer selection influences both the electrochemical response of colloidal inks and their conversion into solid coatings, but these two effects are often evaluated for a single inorganic composition.Here, six hot-injection-derived chalcogenide nanocrystal stocks are combined with sodium alginate, chitosan or cellulose acetate at two nominal stock-mixing ratios to construct a 36-formulation library.The resistance descriptor obtained from liquid-cell impedance shows a pairing-dependent response to composition.Changing the nanocrystal-stock:polymer-stock ratio from 30:70 to 60:40 decreases this descriptor by approximately 51% for CuBSe-chitosan, whereas it increases by approximately 44% for Cu .BSe-chitosan and 52% for AgCrSe -₁.₉₅BSe-₉₅BSe-chi ₂cellulose acetate.Current retention follows a different pattern: the same ratio change that lowers the CuBSe-chitosan resistance descriptor reduces its reported retention by 6.5 percentage points.Eight selected formulations are converted into substrate-supported coatings by sequential drop casting.Their changes in arithmetic mean surface roughness span 0.256-1.662µm, and formulation selection and show why liquid screening, coating topography and contacted-layer response must be evaluated separately.Matched composition changes and measurements before and after casting provide complementary criteria for developing solution-processed chalcogenide-polymer electrochemical layers.
Source: ChemRxiv
Authors: Oluwaseyi Saliu, Cain Witczak, Progna Banerjee
Institution: Loyola University Chicago
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221724062