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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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CaGdF5 based heterogeneous core@shell upconversion nanoparticles for sensitive temperature measurement.

Xiaoyu Xie1,2, Wang Wang1,2, Haoran Chen1

  • 1State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences Changchun 130033 Jilin China liqiqing0742@sina.cn yuleichang@ciomp.ac.cn.

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Lanthanide-doped upconversion nanoparticles (UCNPs) with heterogeneous CaF2 shells show enhanced temperature sensing. These novel nanoparticles exhibit improved luminescence and sensitivity, making them promising for optical temperature sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optical Sensing

Background:

  • Lanthanide-doped upconversion nanoparticles (UCNPs) are widely used for temperature sensing.
  • Thermal quenching effect (TQE) limits UCNP performance, where luminescence intensity decreases with increasing temperature.
  • Enhancing TQE without altering dopants or host materials remains a significant challenge.

Purpose of the Study:

  • To synthesize Yb3+ and Er3+ codoped UCNPs with heterogeneous CaF2 shells for improved optical temperature sensing.
  • To investigate the impact of homogeneous (CaGdF5) and heterogeneous (CaF2) shells on UCNP upconversion luminescence (UCL) and TQE.
  • To evaluate the temperature sensitivity of core@shell UCNPs in the 200-300 K range.

Main Methods:

  • Coprecipitation method used for synthesizing Yb3+ and Er3+ codoped UCNPs within a CaGdF5 host.
  • Fabrication of core@shell UCNPs with both homogeneous (CaGdF5) and heterogeneous (CaF2) shells.
  • Analysis of upconversion luminescence (UCL) intensity and thermal quenching effect (TQE) for different shell materials.
  • Measurement of the temperature-dependent intensity ratio of Er3+ green emission bands (2H11/2 → 4I15/2 and 4S3/2 → 4I15/2).

Main Results:

  • Heterogeneous CaF2-shelled UCNPs exhibited stronger UCL compared to homogeneous CaGdF5-shelled UCNPs.
  • The reduced multiphonon nonradiative relaxation in heterogeneous shells led to enhanced luminescence.
  • UCNPs with CaF2 shells demonstrated higher temperature sensitivity within the 200-300 K range.
  • Maximum thermal sensitivity of CaGdF5:Yb,Er@CaF2 reached 2.2% K-1 at 200 K.

Conclusions:

  • Heterogeneous core@shell UCNPs, specifically those with CaF2 shells, offer superior performance for optical temperature sensing.
  • The design strategy of employing heterogeneous shells effectively enhances UCL and TQE.
  • These findings highlight the potential of heterogeneous core@shell UCNPs as advanced optical temperature sensors.