AI Article Synopsis
- * The resulting nanoparticles have a gold core approximately 12 nm in size and a 4 nm thick SCO shell, maintaining size uniformity and colloidal stability.
- * Tests show that these nanoparticles maintain a spin transition around 340-360 K, and they enhance electrical conductance changes during this transition, leading to significantly improved sensitivity in devices compared to prior memory technologies.
Article Abstract
A simple chemical protocol to prepare core-shell gold@spin-crossover (Au@SCO) nanoparticles (NPs) based on the 1D spin-crossover [Fe(Htrz) (trz)](BF ) coordination polymer is reported. The synthesis relies on a two-step approach consisting of a partial surface ligand substitution of the citrate-stabilized Au NPs followed by the controlled growth of a very thin layer of the SCO polymer. As a result, colloidally stable core@shell spherical NPs with a Au core of ca. 12 nm and a thin SCO shell 4 nm thick, are obtained, exhibiting a narrow distribution in sizes. Differential scanning calorimetry proves that a cooperative spin transition in the range 340-360 K is maintained in these Au@SCO NPs, in full agreement with the values reported for pristine 4 nm SCO NPs. Temperature-dependent charge-transport measurements of an electrical device based on assemblies of these Au@SCO NPs also support this spin transition. Thus, a large change in conductance upon spin state switching, as compared with other memory devices based on the pristine SCO NPs, is detected. This results in a large improvement in the sensitivity of the device to the spin transition, with values for the ON/OFF ratio which are an order of magnitude better than the best ones obtained in previous SCO devices.
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| http://dx.doi.org/10.1002/adma.201900039 | DOI Listing |
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