Article history: Measuring temperature with greater precision at localized small length scales or in a nonperturbative Received 24 June 2017 manner is a necessity in widespread applications, such as integrated photonic devices, micro/nano elec- Received in revised form 9 August 2017 tronics, biology, and medical diagnostics. To this context, use of nanoscale ﬂuorescent temperature probes Accepted 21 August 2017 is regarded as the most promising method for temperature sensing because they are noninvasive, accu- Available online 25 August 2017 rate, and enable remote micro/nanoscale imaging. Here, we propose a novel ratiometric ﬂuorescent sensor for nanothermometry using carbon nanodots (C-dots). The C-dots were synthesized by one-step Keywords: method using femtosecond laser ablation and exhibit unique multi-emission property due to emissions Carbon nanodots from abundant functional groups on its surface. The as-prepared C-dots demonstrate excellent ratiomet- Multi-emission photoluminescence ric temperature sensing under single wavelength excitation that achieves high temperature sensitivity Surface-related emission ◦ ◦ with a 1.48% change per C ratiometric response over wide-ranging temperature (5–85 C) in aqueous Nanothermometry Ratiometric sensors buffer. The ratiometric sensor shows excellent reversibility and stability, holding great promise for the accurate measurement of temperature in many practical applications. © 2017 Elsevier B.V. All rights reserved.
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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