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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.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Updated: Apr 14, 2026

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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InP/ZnS Quantum Dots for High-Sensitivity Temperature Sensors.

Barnali Mahato1, Palash Kusum Das1, Asha Bhardwaj1

  • 1Instrumentation and Applied Physics Department, Indian Institute of Science, Bangalore 560012, India.

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|October 14, 2024
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Summary

Nontoxic indium phosphide/zinc sulfide (InP/ZnS) core-shell quantum dots (QDs) were synthesized and fabricated into three optical temperature sensor configurations. These sensors demonstrate high stability and sensitivity, offering a promising alternative to heavy-metal-based sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optical Engineering

Background:

  • Heavy-metal-based quantum dots (QDs) pose toxicity concerns.
  • Developing stable, nontoxic optical temperature sensors is crucial for various applications.
  • Indium phosphide/zinc sulfide (InP/ZnS) core-shell QDs offer a potential nontoxic alternative.

Purpose of the Study:

  • To synthesize high-quality, nontoxic InP/ZnS core-shell quantum dots (QDs).
  • To investigate the temperature-dependent optical properties of these QDs.
  • To fabricate and evaluate three distinct optical temperature sensor configurations utilizing InP/ZnS QDs.

Main Methods:

  • Synthesis of InP/ZnS core-shell quantum dots.
  • Characterization of temperature-dependent optical properties (photoluminescence, absorption, decay).
  • Fabrication of three sensor configurations: planar thin-film, fiber-filled, and electrospun nanofibers.
  • Performance evaluation including photoluminescence reversibility tests and sensitivity calculations.

Main Results:

  • Achieved a highest critical reversible temperature of 95 °C and sensitivity of 2.1% °C-1.
  • Demonstrated high stability with negligible degradation over 30 days in ambient conditions.
  • The three sensor configurations exhibited varying critical reversible temperatures and sensitivities.

Conclusions:

  • Nontoxic InP/ZnS QD-based optical temperature sensors exhibit promising performance comparable to existing technologies.
  • These sensors offer a stable and potentially safer alternative to heavy-metal-based optical temperature sensors.
  • The developed sensor configurations show potential for practical applications in temperature monitoring.