Cited by 110Carbon Nanotubes in CompositesAnalytical Chemistry and SensorsCarbon and Quantum Dots Applications

Optical Probing of Local pH and Temperature in Complex Fluids with Covalently Functionalized, Semiconducting Carbon Nanotubes

Kwon, Hyejin, Kim, Mijin, Meany, Brendan, Piao, Yanmei, Powell, Lyndsey R., Wang, YuHuang·2015·The Journal of Physical Chemistry C

Abstract

We show that local pH can be optically probed through defect photoluminescence from semiconducting carbon nanotubes covalently functionalized with aminoaryl groups. Switching between protonated and deprotonated forms of the amino moiety produces an energy shift in the defect state of the functionalized nanotube by as much as 33 meV in the near-infrared region. This unexpected observation enables a new optical pH sensor that features ultrabright near-infrared II (1.1–1.4 μm) photoluminescence, a sensitivity for pH changes as small as 0.2 pH units over a wide working window that covers the entire physiologic pH range, and potentially molecular resolution. Independent of pH, this nanoprobe can simultaneously act as a nanothermometer by monitoring temperature-modulated changes in photoluminescence intensity, which follows the van’t Hoff equation. This work opens new opportunities for quantitative probing of local pH and temperature changes in complex biological systems.

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Crossref · 10.1021/jp509546d

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Authors
Kwon, H., Kim, M., Meany, B., Piao, Y., Powell, L. R., & Wang, Y.
Affiliations
University of Maryland, College Park (US)
Corresponding author
Wang, YuHuang
Venue
The Journal of Physical Chemistry C
Published
2015-02-09
Volume
119
Issue
7
Pages
3733-3739
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
OpenAlex
W2312316573
Cited by
110
References
39
Citations by year
2026: 6 · 2025: 9 · 2024: 14 · 2023: 12 · 2022: 13 · 2021: 13 · 2020: 6 · 2019: 9 · 2018: 6 · 2017: 11 · 2016: 7 · 2015: 4
FWCI
3.79
Type
journal article
Language
en
Open access
closed
Locations
The Journal of Physical Chemistry C (publishedVersion)
Funders
Division of Chemistry (CHE-1055514)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Carbon Nanotubes in Composites
  • Physical Sciences › Chemical Engineering › Bioengineering › Analytical Chemistry and Sensors
  • Physical Sciences › Materials Science › Materials Chemistry › Carbon and Quantum Dots Applications
Keywords
optical pH sensing, optical thermometry, semiconducting carbon nanotubes, covalent functionalization, defect photoluminescence, near-infrared emission, protonation and deprotonation, energy shift, nanothermometers, van't Hoff equation, complex fluids

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