Oleylamine Impurities Regulate Temperature-Dependent Hierarchical Assembly of Ultranarrow Gold Nanowires on Biotemplated Interfaces
| Autor: | Shelley A. Claridge, Tianhong Ouyang, Ashlin G. Porter, Tyson C. Davis, Tyler R. Hayes, Anni Shi, Erin N. Lang |
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| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Nanowire General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Impurity Oleylamine Liquid crystal General Materials Science Amines Alkyl chemistry.chemical_classification Nanowires Temperature General Engineering 021001 nanoscience & nanotechnology 0104 chemical sciences Nanocrystal Chemical engineering chemistry Gold Self-assembly 0210 nano-technology |
| Zdroj: | ACS Nano. 15:10275-10285 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.1c02414 |
| Popis: | Nanocrystals are often synthesized using technical grade reagents such as oleylamine (OLAm), which contains a blend of 9-cis-octadeceneamine with trans-unsaturated and saturated amines. Here, we show that gold nanowires (AuNWs) synthesized with OLAm ligands undergo thermal transitions in interfacial assembly (ribbon vs. nematic); transition temperatures vary widely with the batch of OLAm used for synthesis. Mass spectra reveal that higher-temperature AuNW assembly transitions are correlated with an increased abundance of trans and saturated chains in certain blends. DSC thermograms show that both pure (synthesized) and technical-grade OLAm have primary melting transitions near -5 °C (20-30 °C lower than the literature melting temperature range of OLAm). A second, broader melting transition (in the previous reported melting range) appears in technical grade blends; its temperature varies with the abundance of trans and saturated chains. Our findings illustrate that, similar to biological membranes, blends of alkyl chains can be used to generate mesoscopic hierarchical nanocrystal assembly, particularly at interfaces that further modulate transition temperatures. |
| Databáze: | OpenAIRE |
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