Quasi-isotropic high pressure, large volume synthesis of a polymeric composite incorporating diamond-like carbon nano-threads

Year: 2023

Authors: Fanetti S.; Romi S.; Crichton W.; Rosenthal A.; Scelta D.; Alabarse F.; Bini R.; Santoro M.

Autors Affiliation: Consiglio Nazl Ric Ist Chim Composti OrganoMetall, Via Madonna Piano 10, I-50019 Sesto Fiorentino, FI, Italy; European Lab Nonlinear Spect LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; ESRF, European Synchrotron Radiat Facil, 71 Ave Martyrs,CS40220, Grenoble, France; Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia; AREA Sci Pk, Elettra Sincrotrone Trieste S Cp A, I-34149 Basovizza, TS, Italy; Univ Firenze, Dipartimento Chim Ugo Schiff, Via Lastruccia 3, I-50019 Sesto Fiorentino, FI, Italy; Consiglio Nazl Ric Ist Nazl Ottica, Via Nello Carrara 1, I-50019 Sesto Fiorentino, FI, Italy.

Abstract: The high pressure synthesis of hydrogenated, sp3-hybridized carbon nanothreads from aromatics is a vibrant research area. These nanomaterials are expected to join the high tensile strength of diamond with the high flexibility of polymers. The smart selection of the initial aromatic substance leads to tailor transport and optical properties and to enhance the selectivity of the synthesis. So far, the synthesis has only been performed in two-opposed anvils cells, supporting large uniaxial stress. To increase chemical selectivity and yield, the interplay between this stress and the intrinsic relative molecular orientation in the starting crystal is a very important aspect to clarify. We report the synthesis (30 GPa) of a diphenylacetylene-derived polymeric composite incorporating domains of potentially semiconductive C-nanothreads, performed in a large volume, multi-anvil two-stage press. This device provides quasi-isotropic direct compression of millimeter-sized samples. Materials characterizations were performed by synchrotron, powder X-ray diffraction and Infrared spectroscopy. The product is quite similar to those previously obtained in diamond anvil cells, showing that the synthesis is not related to uniaxial stress and is instead driven by the favourable intermolecular orientation in the initial molecular solid. These findings are very likely to be common to many other aromatic systems, and also show the scalability to large volumes of the C-nanothreads synthesis.

Journal/Review: DIAMOND AND RELATED MATERIALS

Volume: 136      Pages from: 109912-1  to: 109912-8

KeyWords: Hydrogenated, diamond-like carbon nanothreads; High pressure synthesis; Multianvil large-volume press; Synchrotron X-ray diffraction; Optical spectroscopy
DOI: 10.1016/j.diamond.2023.109912

Citations: 3
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