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One-step synthesis of fluorescent smart thermo- responsive copper clusters： A potential nanothermometer in living cells

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Nano Research 2015年第6期8卷 1975-1986页

作者： Chan Wang Lin Ling Yagang Yao Qijun Song Key Laboratory of Food Colloids and Biotechnology Ministry of Education School of Chemical & Material Engineering Jiangnan University Wuxi 214122 China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemistry and Chemical Engineering Nanjing Tech University Nanjing 210009 China

Temperature measurement in biology and medical diagnostics, along with sensitive temperature probing in living cells, is of great importance; however, it still faces significant challenges. Metal nanoclusters （NCs） with attractive luminescent properties may be promising candidates to overcome such challenges. Here, a novel one-step synthetic method is presented to prepare highly fluorescent copper NCs （CuNCs） in ambient conditions by using glutathione （GSH） as both the reducing agent and the protective layer preventing the aggregation of the as-formed NCs. The resultant CuNCs, with an average diameter of 2.3 nm, contain 1-3 atoms and exhibit red fluorescence （A^m = 610 nm） with high quantum yields （QYs, up to 5.0%）. Interestingly, the fluorescence signal of the CuNCs is reversibly responsive to the environmental temperature in the range of 15-80 ℃. Furthermore, as the CuNCs exhibit good biocompatibility, they can pervade the MC3T3-E1 cells and enable measurements over the physiological temperature range of 15-45 ℃ with the use of the confocal fluorescence imaging method. In view of the facile synthesis method and attractive fluorescence properties, the as-prepared CuNCs may be used as photoluminescence thermometers and biosensors.

关键词： fluorescence copper nanoclusters cellular imaging nanothermometer

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α-NaYb（Mn）F4:Er3+@NaYF4 UCNPs as luminescent nanothermometer over a wide temperature range

α-NaYb（Mn）F4:Er3+@NaYF4 UCNPs as luminescent nanothermome...

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中国化学会第九届全国无机化学学术会议

作者： Jing Feng Xia Xu Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

Temperature is one of the most important parameters as it is a principal thermodynamic property. Among the techniques for measuring temperature, luminescence-based thermometers attract much attention because of their fast response, high precision and resolution.[1,2] ɑ-Na Yb（Mn）F4:Er3+@NaYF4 upconversion nanoparticles（UCNPs） as luminescent nanothermometers have been developed by combining liquid-solid solution solvothermal strategy with thermal decomposition strategy. Under 980 nm excitation, it exhibits intense upconversion luminescence（UCL） and temperature-dependent UCL over a wide temperature range（123-423 K）. Temperature has different influences on the intensity of different emission bands and the thermally coupled levels of Er3+（2H411/2 and S3/2） in a wide temperature range from 123 to 423 K are investigated. ɑ-NaYb（Mn）F4:Er3+@NaYF4 UCNPs are excellent candidate for temperature sensors with high sensitivity.

关键词： Rare earth upconversion luminescence nanothermometer

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Influence of frequency increase on magnetic nanothermometer

Influence of frequency increase on magnetic nanothermometer

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第37届中国控制会议

作者： Wenbiao Xu Xuejing Lan Pu Zhang Wenzhong Liu Guangdong Institute of Metrology Guangdong Provincial Key Laboratory of Modern Geometric and Mechanical Metrology Technology School of mechanical and electrical engineering Guangzhou university School of Automation Huazhong University of Science and Technology

Considering the requirements of the temperature measurement during magnetic thermotherapy and some transient process, the working frequency of the magnetic nanothermometer needs to be increased. In this paper, the effect of the frequency increase of the applied magnetic field is analyzed from the origin of magnetodynamics. The theoretical models containing relaxation are deduced to compare with the experimental results. The experimental results verify the temperature sensitivity of the magnetic nanoparticles, and show the difference with the simulation results of theoretical models.

关键词： Magnetic nanoparticles nanothermometer Magnetic Relaxation

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