Ratiometric pH sensor based on fluorescent core–shell nanoparticles

Timur Sh Atabaev, Hong Ha Thi Vu, Yoon Hwae Hwang, Hyung Kook Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper describes the preparation of fluorescent core–shell composite nanoparticles (NPs) that enable ratiometric pH measurements in a biologically relevant pH-range. The core of the composite NPs, which was used as the reference, consisted of Y2O3:Eu3+, which exhibited strong red fluorescent emission. A pH-sensitive fluorescein isothiocyanate (FITC) dye was incorporated in the outer amorphous silica shell as a pH indicator. The outer silica shell layer with FITC exhibited excellent fluorescent responses to pH, while the relative fluorescence intensity of Y2O3:Eu3+ was independent of the pH. Spectral characterization of the composite NPs by photoluminescence spectroscopy revealed good pH sensitivity with no significant differences over a relatively long period of time.

Original languageEnglish
Pages (from-to)8313-8316
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume17
Issue number11
DOIs
Publication statusPublished - 2017
Externally publishedYes

Fingerprint

pH sensors
Nanoparticles
Fluorescein
Silicon Dioxide
nanoparticles
sensors
Composite materials
Silica
Photoluminescence spectroscopy
Coloring Agents
Dyes
composite materials
Fluorescence
silicon dioxide
fluorescence
Spectrum Analysis
dyes
isothiocyanic acid
photoluminescence
preparation

Keywords

  • Core–Shell Structure
  • Fluorescent Nanoparticles
  • PH Detection
  • Ratiometric Sensor

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ratiometric pH sensor based on fluorescent core–shell nanoparticles. / Atabaev, Timur Sh; Vu, Hong Ha Thi; Hwang, Yoon Hwae; Kim, Hyung Kook.

In: Journal of Nanoscience and Nanotechnology, Vol. 17, No. 11, 2017, p. 8313-8316.

Research output: Contribution to journalArticle

Atabaev, Timur Sh ; Vu, Hong Ha Thi ; Hwang, Yoon Hwae ; Kim, Hyung Kook. / Ratiometric pH sensor based on fluorescent core–shell nanoparticles. In: Journal of Nanoscience and Nanotechnology. 2017 ; Vol. 17, No. 11. pp. 8313-8316.
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