Direct Laser Writing of Photostable Fluorescent Silver Nanoclusters in Polymer Films

Puskal Kunwar, Jukka Hassinen, Godofredo Bautista, Robin H. A. Ras*, Juha Toivonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)
403 Downloads (Pure)


Metal nanoclusters consist of a few to a few hundred atoms and exhibit attractive molecular properties such as ultrasmall size, discrete energy levels, and strong fluorescence. Although patterning of these clusters down to the micro- or nanoscale could lead to applications such as high-density data storage, it has been reported only for inorganic matrices. Here we present submicron-scale mask-free patterning of fluorescent silver nanoclusters in an organic matrix. The nanoclusters were produced by direct laser writing in poly(methacrylic acid) thin films and exhibit a broadband emission at visible wavelengths with photostability that is superior to that of Rhodamine 6G dye. This fabrication method could open new opportunities for applications in nanophotonics like imaging, labeling, and metal ion sensing. We foresee that this method can be further applied to prepare other metal nanoclusters embedded in compositionally different polymer matrices.

Original languageEnglish
Pages (from-to)11165-11171
Number of pages7
JournalACS Nano
Issue number11
Publication statusPublished - Nov 2014
MoE publication typeA1 Journal article-refereed


  • optical lithography
  • metal nanoclusters
  • photoluminescence
  • photobleaching
  • photostability
  • polymer


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