Pressure-induced assemblies and structures of graphitic-carbon sheet encapsulated Au nanoparticles

Partha Pratim Das, Sudeshna Samanta, Douglas A. Blom, Srikrishna Pramanik, P. Sujatha Devi, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticlepeer-review

Abstract

A novel strategy of using hydrostatic pressures to synthesize gold-carbon (Au-C) nanohybrid materials is explored. The stable face-centered-cubic (fcc) Au undergoes a structural phase transition to a mixture of primitive orthorhombic and cubic phases as the carbon phase acquires a highly ordered onion-like carbon (OLC) structure which encapsulates the Au nanoparticles, thereby exerting an additional pressure. Increasing the pressure results in a one dimensional (1-D) chain-like structure with the primitive cubic Au nanoparticles contained in an amorphous carbon matrix. The OLC structure allows the formation of quenchable Au nanoparticle phases with the primitive close packing and Au-C hybrids with new mesoscopic structures. Under pressure, we observe the formation of a hybrid material composed of a poorly conducting matrix made of amorphous carbon and conducting OLC-encapsulated Au nanoparticles. The electrical conductivity of this hybrid material under pressure reveals a percolation threshold. We present a new synthesis approach to explore the interplay between atomic and mesoscopic structures and the electrical conductivity of metal hybrid structures.

Original languageEnglish
Pages (from-to)17462-17469
Number of pages8
JournalNanoscale
Volume12
Issue number33
DOIs
Publication statusPublished - 2020 Sep 7

Bibliographical note

Funding Information:
This work was supported by the Leader Researcher program (NRF-2018R1A3B1052042) of the Korean Ministry of Science, ICT and Planning (MSIP). We also thank the supports by NRF-2019K1A3A7A09033395, NRF-2016K1A4A3914691 grants of the MSIP.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Pressure-induced assemblies and structures of graphitic-carbon sheet encapsulated Au nanoparticles'. Together they form a unique fingerprint.

Cite this