# High-efficiency infra-red shielding and UV blocking by carbon dots assisted Cesium doped tungsten oxide nanoparticles

https://mdr.nims.go.jp/datasets/ed041523-6a00-40ee-91c2-e23749656ba1

## File

- [DAS JSAP Autumn 2025r1.docx](https://mdr.nims.go.jp/filesets/3faf75d9-9e05-4842-898d-62e056ff247f/download) ([Detail](https://mdr.nims.go.jp/filesets/3faf75d9-9e05-4842-898d-62e056ff247f.md))

## Id

ed041523-6a00-40ee-91c2-e23749656ba1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-07-06T08:42:23.601674Z

## Updated at

2026-08-17T05:07:48.265674Z

## Published at

2026-08-17T07:29:51.875056Z

## Doi

https://doi.org/10.48505/nims.6384

## First published url



## Date published



## Recorded date published



## Resource type

conference_presentation

## Manuscript type

na

## Collection



## Title

- title: High-efficiency infra-red shielding and UV blocking by carbon dots assisted
    Cesium doped tungsten oxide nanoparticles
  title_type: original
  lang: en

## Description

- description: We developed a high efficiency heat shielding and UV blocking hybrid
    material composed of Cesium doped tungsten oxide (CWO) nanoparticles and metal-free
    carbon dots (CDs) in a thin film called CWO-CDs hereon. Carbon dots act as highly
    efficient UV-A (315-400 nm) blocker while promoting aggregation of CWO nanoparticles.
    CWO nanoparticles are bound by the free functional groups found attached to the
    carbon core of carbon dots. This mechanism of aggregation by carbon dots increases
    porosity of the hybrid CWO-CDs film forming clusters and pores. These pores act
    as cavities increasing light-matter interactions. This leads to an enhanced near
    infra-red absorption. CWO-CDs thin film reached maximum solar heat blocking efficiencies
    of 91.2% in the near infra-red and 85% in the UV-A while maintaining optimum visible
    transparency. When applied to a house model, it could lower indoor temperatures
    as large as 12 degrees Celsius while also protecting from harmful UV-A radiation,
    ensuring effective applications to windows and skylights.
  description_type: abstract
  lang: eng

## Creator

- name: Adrija Das
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Semiconductor
    Materials Field/Photonics Nano Engineering Group
- name: Barun Kumar Barman
  role: author
  orcid: https://orcid.org/0000-0002-9894-1890
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Semiconductor
    Materials Field/Photonics Nano Engineering Group
- name: Tadaaki Nagao
  role: author
  orcid: https://orcid.org/0000-0002-6746-2686
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Semiconductor
    Materials Field/Photonics Nano Engineering Group

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## Keyword

- subject: solar blocking
  schema: not_defined
- subject: cesium tungten oxide
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: 第86回応用物理学会秋季学術講演会/The 86th JSAP Autumn Meeting 2025
start_date: 2025-09-07
end_date: 2025-09-10
identifier: https://meeting.jsap.or.jp/archive/jsap2025a/

## Related item



## Funding

- identifier: GSE034
  funder_name: JAXA
  description: TansaX　プロジェクト

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Specific property for specimen



## Process for specimen treatment



## Computational method



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## Fileset

- id: 3faf75d9-9e05-4842-898d-62e056ff247f
  filename: DAS JSAP Autumn 2025r1.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 212070
  md5: 1b04b45c61a09b2ea1d2c95cf5e11822

## Thumbnail

fileset_id: 3faf75d9-9e05-4842-898d-62e056ff247f
filename: DAS JSAP Autumn 2025r1.docx