High-Pressure Synthesis of 1D Low-Bandgap Polymers Embedded in Diamond-like Carbon Nanothreads

Year: 2022

Authors: Romi S., Fanetti S., Alabarse F.G., Bini R., Santoro M.

Autors Affiliation: European Laboratory for Nonlinear Spectroscopy (LENS), via Nello Carrara 1, (FI), Sesto Fiorentino, 50019, Italy; Consiglio Nazionale Delle Ricerche – Istituto di Chimica Dei Composti OrganoMetallici, via Madonna del Piano 10, (FI), Sesto Fiorentino, 50019, Italy; Elettra Sincrotrone Trieste S.C.p.A, AREA Science Park, TS, Basovizza, 34149, Italy; Dipartimento di Chimica Ugo Schiff, Universita di Firenze, via della Lastruccia 3, (FI), Sesto Fiorentino, 50019, Italy;

Abstract: The synthesis of hydrogenated carbon nanothreads at tens of GPa from aromatic systems is one of the most brilliant recent findings in high-pressure science. C-nanothreads combine the high tensile strength of diamond with the high flexibility of polymers, and many efforts are currently being undertaken to taylor some useful physicochemical properties by smartly modifying their local structure. We present the synthesis of double core diamond-like nanothreads with the two cores being bound by a conjugated C, polyacetylene-like backbone. The two cores also form a protecting sheath for the backbone. This material exhibits an optical bandgap of 1.74 eV, similar to polyacetyelene; it is then very attractive as a potential organic semiconductor with simultaneous outstanding mechanical properties. The synthesis was achieved by reacting diphenylacetylene in diamond anvil cells, at 25-30 GPa and room temperature, and the materials were characterized by optical spectroscopy, synchrotron X-ray diffraction, and ab initio computer simulations.

Journal/Review: CHEMISTRY OF MATERIALS

Volume: 34 (5)      Pages from: 2422  to: 2428

More Information: We thank the European Laboratory for Nonlinear Spectroscopy (LENS) for hosting part of this research and the Fondazione Cassa di Risparmio di Firenze for the strong support. We acknowledge Elettra Sincrotrone Trieste for providing access to the XPRESS beamline and for financial support under proposal numbers 20200162 and 20205110.
KeyWords: Aromatic system; Diamond like carbon; High flexibility; High pressure; High-pressure synthesis; High-tensile strength; Hydrogenated carbon; Low bandgap polymers; Low-bandgap polymers; Nanothreads
DOI: 10.1021/acs.chemmater.1c04453

Citations: 14
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