Fig. 3: Synthesis and characterization of NDCs encapsulating high-pressure AuNPs using freestanding C-AuNPs-C films as precursors.
From: Preserving high-pressure solids via freestanding thin-film engineering
a An optical microscopy image showing ~20 stacked layers of C-AuNPs-C films loaded into the sample chamber of a DAC. The scale bar represents 50 μm. b Raman spectra of the initial sample and the sample recovered from ~56 GPa and ~2200 K. c A TEM image of the cross-section of the sample recovered from ~56 GPa. d A SAED image of the sample, showing diffraction rings corresponding to an fcc Au and a cubic diamond phase. The scale bar represents 5 nm−1. e An HRTEM image of an AuNP with (111) d-spacing of ~2.21 Å, surrounded by nanocrystalline diamonds with (111) d-spacing of ~2.06 Å. The scale bar represents 3 nm. The TEM studies on the sample treated under the same HPHT conditions were conducted on materials from a single synthesis experiment.
