# Atmospherically Stable Poly(Heptazine Imide) Composites

https://mdr.nims.go.jp/datasets/168af3ae-e0eb-410f-95c7-d2ff5977e216

## File

- [atmospherically-stable-poly(heptazine-imide)-composites.pdf](https://mdr.nims.go.jp/filesets/284307c2-d83c-42e2-924f-76b2cc8ccf20/download) ([Detail](https://mdr.nims.go.jp/filesets/284307c2-d83c-42e2-924f-76b2cc8ccf20.md))

## Id

168af3ae-e0eb-410f-95c7-d2ff5977e216

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-03-24T00:29:44.097010Z

## Updated at

2026-03-24T00:34:32.602071Z

## Published at

2026-03-24T03:23:56.124963Z

## Doi



## First published url

https://doi.org/10.1021/acsomega.6c00037

## Date published

2026-03-17

## Recorded date published

2026-3-17

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Atmospherically Stable Poly(Heptazine Imide) Composites
  title_type: original
  lang: en

## Description

- description: Metal poly(heptazine imide) (MPHI), a two-dimensional carbon nitride
    polymer containing monovalent metal ions (M+), has recently attracted attention
    as a novel visible-light-driven photocatalyst. It exhibits photochromism, changing
    from yellow to blue-green upon light irradiation, regardless of the metal species,
    and is known to enhance ionic conductivity. Consequently, it has the potential
    to serve as a novel photoresponsive ionic conductor. However, the excited (color-changed)
    state that exhibits ionic conductivity is easily deactivated by atmospheric or
    dissolved oxygen in solution, making its application in actual devices challenging.
    Therefore, in this study, we developed a composite, protonated poly(heptazine
    imide) (HPHI):polyvinyl alcohol (PVA), by dispersing HPHI prepared by the acid
    treatment of potassium poly(heptazine imide) into a matrix of the insulating polymer
    PVA, which possesses high oxygen-blocking properties. HPHI:PVA can maintain a
    color-changed state for extended periods, even in air, while sustaining a low
    electrical resistance state. The duration of this color-changed state can be controlled
    by varying the degree of PVA saponification or temperature. Furthermore, a detailed
    investigation of the dependence of the electrical properties of HPHI:PVA on the
    percentage of HPHI revealed that proton conduction in HPHI:PVA arises from the
    percolation of poly(heptazine imide) particles within the composite. This finding
    also provides fundamental information regarding the ion-conduction mechanism in
    other MPHI composites. This study serves as an important guideline for the future
    development of new MPHI composites and applied research.
  description_type: abstract
  lang: und

## Creator

- name: Tatsushige Izumi
  role: author
- name: Ryoma Hayakawa
  role: author
  orcid: https://orcid.org/0000-0002-1442-8230
- name: Momoka Isobe
  role: author
- name: Ryosuke Ohnuki
  role: author
  orcid: https://orcid.org/0000-0001-5024-3025
- name: Yutaka Wakayama
  role: author
  orcid: https://orcid.org/0000-0002-0801-8884
- name: Shinya Yoshioka
  role: author
- name: Kaname Kanai
  role: author
  orcid: https://orcid.org/0000-0002-3952-5491

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: Ions
  schema: not_defined
- subject: Irradiation
  schema: not_defined
- subject: Composites
  schema: not_defined
- subject: Proton conductivity
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: ACS Omega
  issn: '24701343'
  volume: '11'
  issue: '10'
  start_page: 16835
  end_page: 16843

## Conference



## Related item



## Funding

- identifier: 22K05259
  funder_name: Ministry of Education, Culture, Sports, Science and Technology

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 284307c2-d83c-42e2-924f-76b2cc8ccf20
  filename: atmospherically-stable-poly(heptazine-imide)-composites.pdf
  content_type: application/pdf
  size: 3621779
  md5: 632e18b71faa7ada4e52adbe48c461fd

## Thumbnail

fileset_id: 284307c2-d83c-42e2-924f-76b2cc8ccf20
filename: atmospherically-stable-poly(heptazine-imide)-composites.pdf