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Highly efficient ratiometric nanothermometers based on colloidal carbon quantum dots
School of Basic Medicine, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China.
School of Basic Medicine, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China.
State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Molecular Science and Nano Systems, Ca' Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.ORCID iD: 0000-0003-2935-1165
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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
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Experimental Physics
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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)

Available from: 2021-05-04 Created: 2021-05-04 Last updated: 2021-08-31Bibliographically approved

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Vomiero, Alberto

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