Highly efficient ratiometric nanothermometers based on colloidal carbon quantum dotsShow others and affiliations
2021 (English)In: Journal of materials chemistry. B, ISSN 2050-750X, E-ISSN 2050-7518, Vol. 9, no 20, p. 4111-4119Article in journal (Refereed) Published
Abstract [en]
Optical nanothermometers have attracted much attention due to their non-contact and precise measurement with high spatial resolution at the micro- and nanoscales. They can be applied in various fields such as micro-opto-electronics, photonics, and biomedical thermal and pH sensing, while most thermal sensors reported so far contain heavy metals or have low sensitivity. Herein, we demonstrate a highly sensitive ratiometric thermal sensor based on colloidal C-dots. C-dots exhibit dual emission originating from the band gap emission and surface-dominant emission, which show a different temperature-dependent photoluminescence (PL) response. Among different surface-functionalized C-dots, C-dots@OH exhibit an absolute thermal sensitivity of -0.082 degrees C-1, which is the highest among various types of ratiometric thermosensors, making it a very promising candidate for high-sensitivity, self-calibrated nanoscale thermometry. As a proof-of-concept, C-dots@OH were employed to monitor the intracellular temperature (32-42 degrees C), showing a clear trend for temperature variation in a single cell, indicating that C-dots could offer a powerful tool for a potential precise measurement of the intracellular temperature. They could also be used as thermal sensors for nano-electronic and optoelectronic devices.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2021. Vol. 9, no 20, p. 4111-4119
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-84107DOI: 10.1039/D1TB00224DISI: 000639150700001PubMedID: 34037068Scopus ID: 2-s2.0-85106886796OAI: oai:DiVA.org:ltu-84107DiVA, id: diva2:1549034
Funder
The Kempe FoundationsKnut and Alice Wallenberg Foundation
Note
Validerad;2021;Nivå 2;2021-05-31 (alebob)
2021-05-042021-05-042021-08-31Bibliographically approved