Two-dimensional polyaniline (C3 N) from carbonized organic single crystals in solid state

Javeed Mahmood, Eun Kwang Lee, Minbok Jung, Dongbin Shin, Hyun Jung Choi, Jeong Min Seo, Sun Min Jung, Dongwook Kim, Feng Li, Myoung Soo Lah, Noejung Park*, Hyung Joon Shin, Joon Hak Oh, Jong Beom Baek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

382 Scopus citations

Abstract

The formation of 2D polyaniline (PANI) has attracted considerable interest due to its expected electronic and optoelectronic properties. Although PANI was discovered over 150 y ago, obtaining an atomically well-defined 2D PANI framework has been a longstanding challenge. Here, we describe the synthesis of 2D PANI via the direct pyrolysis of hexaaminobenzene trihydrochloride single crystals in solid state. The 2D PANI consists of three phenyl rings sharing six nitrogen atoms, and its structural unit has the empirical formula of C3 N. The topological and electronic structures of the 2D PANI were revealed by scanning tunneling microscopy and scanning tunneling spectroscopy combined with a first-principle density functional theory calculation. The electronic properties of pristine 2D PANI films (undoped) showed ambipolar behaviors with a Dirac point of -37 V and an average conductivity of 0.72 S/cm. After doping with hydrochloric acid, the conductivity jumped to 1.41 × 103 S/cm, which is the highest value for doped PANI reported to date. Although the structure of 2D PANI is analogous to graphene, it contains uniformly distributed nitrogen atoms for multifunctionality; hence, we anticipate that 2D PANI has strong potential, from wet chemistry to device applications, beyond linear PANI and other 2D materials.

Original languageEnglish (US)
Pages (from-to)7414-7419
Number of pages6
JournalPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume113
Issue number27
DOIs
StatePublished - Jul 5 2016

Bibliographical note

Funding Information:
This work was supported by the Creative Research Initiative, BK21 Plus, and Mid-Career Researcher programs through the National Research Foundation of Korea. E.K.L. acknowledges the Global PhD Fellowship program.

Keywords

  • 3 N
  • Nitrogenated graphene
  • Polyaniline
  • Solid-state
  • Two-dimensional

ASJC Scopus subject areas

  • General

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