Biotinylated photocleavable semiconductor colloidal quantum dot supraparticle microlaser

Charlotte J. Eling, Natalie Bruce, Naresh-Kumar Gunasekar, Pedro Urbano Alves, Paul R. Edwards, Robert W. Martin, Nicolas Laurand

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Abstract

Luminescent supraparticles of colloidal semiconductor nanocrystals can act as microscopic lasers and are hugely attractive for biosensing, imaging, and drug delivery. However, biointerfacing these to increase functionality while retaining their main optical properties remains an unresolved challenge. Here, we propose and demonstrate red-emitting, silica-coated CdS xSe 1−x/ZnS colloidal quantum dot supraparticles functionalized with a biotinylated photocleavable ligand. The success of each step of the synthesis is confirmed by scanning electron microscopy, energy dispersive X-ray and Fourier transform infrared spectroscopy, ζ-potential, and optical pumping measurements. The capture and release functionality of the supraparticle system is proven by binding to a neutravidin functionalized glass slide and subsequently cleaving off after UV-A irradiation. The biotinylated supraparticles still function as microlasers; e.g., a 9 μm diameter supraparticle has oscillating modes around 625 nm at a threshold of 58 mJ/cm 2. This work is a first step toward using supraparticle lasers as enhanced labels for bionano applications.

Original languageEnglish
Pages (from-to)9159-9166
Number of pages8
JournalACS Applied Nano Materials
Volume7
Issue number8
Early online date16 Apr 2024
DOIs
Publication statusPublished - 26 Apr 2024

Keywords

  • colloidal quantum dots
  • microlasers
  • photocleavage
  • supraparticle
  • self-assembly
  • microresonators
  • whispering gallery modes

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