Large-area nanofabrication of partially embedded nanostructures for enhanced plasmonic hot-carrier extraction

Charlene Ng, Peng Zeng, Julian A. Lloyd, Debadi Chakraborty, Ann Roberts, Trevor A. Smith, Udo Bach, John E. Sader, Timothy J. Davis, Daniel E. Gómez

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)


When plasmonic nanoparticles are coupled with semiconductors, highly energetic hot carriers can be extracted from the metal-semiconductor interface for various applications in light energy conversion. However, the current quantum yields for hot-electron extraction are generally low. An approach for increasing the extraction efficiency consists of maximizing the contact area between the surface of the metal nanostructure and the electron-accepting material. In this work, we developed an innovative, simple, and scalable fabrication technique that partially embeds colloidal plasmonic nanostructures within a semiconductor TiO2 layer without utilizing any complex top-down nanofabrication method. The successful embedding is confirmed by scanning electron microscopy and atomic force microscopy imaging. Using visible-pump, near-IR probe transient absorption spectroscopy, we also provide evidence that the increase in the surface contact area between the nanostructures and the electron-accepting material leads to an increase in the amount of hot-electron injection into the TiO2 layer.

Original languageEnglish
Pages (from-to)1164-1169
Number of pages6
JournalACS Applied Nano Materials
Issue number3
Publication statusPublished - 22 Mar 2019


  • hot electrons
  • large-scale fabrication
  • partially embedded structures
  • plasmonic
  • plasmonic photocatalysis
  • Schottky barrier

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