Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Biotinylated photocleavable semiconductor colloidal quantum dot supraparticle microlaser

Eling, Charlotte J., Bruce, Natalie, Gunasekar, Naresh-Kumar, Alves, Pedro Urbano, Edwards, Paul R., Martin, Robert W. and Laurand, Nicolas 2024. Biotinylated photocleavable semiconductor colloidal quantum dot supraparticle microlaser. ACS Applied Nano Material 7 (8) , 9159–9166. 10.1021/acsanm.4c00668

[thumbnail of eling-et-al-2024-biotinylated-photocleavable-semiconductor-colloidal-quantum-dot-supraparticle-microlaser.pdf]
PDF - Published Version
Available under License Creative Commons Attribution.

Download (4MB) | Preview


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 CdSxSe1−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/cm2. This work is a first step toward using supraparticle lasers as enhanced labels for bionano applications.

Item Type: Article
Status: Published
Schools: Physics and Astronomy
Publisher: American Chemical Society
ISSN: 2574-0970
Funders: EPSRC
Date of First Compliant Deposit: 16 April 2024
Date of Acceptance: 8 April 2024
Last Modified: 29 Apr 2024 10:45

Actions (repository staff only)

Edit Item Edit Item


Downloads per month over past year

View more statistics