Optical imaging and spectroscopy of SnO 2 -rhodamine 6G composite's desiccation patterns

Abey Issac, R. G. Sumesh Sofin, Dana Salim Humood Al Ghafri, Mariam Hamed Rashid Al Alawi, Osama Abou-Zied

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, we produced self-assembly structures (desiccation patterns) in the drying sessile drops of SnO 2 -R6G colloidal suspension that have functional applications. Colloidal suspensions of SnO 2 nanoparticles were synthesized using the sol-gel method and, subsequently, R6G molecules were added into the suspension. Centimeter-sized honeycomb- or tree-like self-assembled structures of the nanoparticle-dye composite are formed from the evaporating droplets on a flat glass surface. The usual “coffee ring” effect observed in the case of drying of a sessile drop of dye solution is inhibited this way, which is desirable in many applications. The structures were investigated using optical microscopy and spectroscopy. The resemblance between transmission and fluorescence images illustrates the feasibility of organizing dye molecules in a specific way using self-assembled nanoparticles as a template. However, dye fluorescence from the self-assembly is very weak, which might be due to photoinduced interfacial electron transfer from the excited dye molecules to the nanoparticles.

Original languageEnglish
Article number114302
JournalJournal of Applied Physics
Volume125
Issue number11
DOIs
Publication statusPublished - Mar 21 2019

    Fingerprint

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this