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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

4.3K
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...
4.3K
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

2.1K
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

6.1K
Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
6.1K
Thermosensation01:43

Thermosensation

29.7K
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
29.7K
Gas Thermometers and the Kelvin Scale01:22

Gas Thermometers and the Kelvin Scale

5.2K
The definition of temperature in terms of molecular motion suggests that there should be a lowest possible temperature, where the average kinetic energy of molecules is zero (or the minimum allowed by quantum mechanics). Experiments confirm the existence of such a temperature, called absolute zero. An absolute temperature scale is one whose zero point is absolute zero. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly...
5.2K
Joule-Thomson Effect01:21

Joule-Thomson Effect

11.7K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
11.7K

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Related Experiment Video

Updated: May 5, 2026

Fabrication and Testing of Photonic Thermometers
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Fabrication and Testing of Photonic Thermometers

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A Colloidal Quantum Dot Thermistor and Bolometer.

Gaurav Kumar1, Mariona Dalmases1, Nima Taghipour1

  • 1ICFO-Insitut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain.

Advanced Materials (Deerfield Beach, Fla.)
|May 4, 2026
PubMed
Summary
This summary is machine-generated.

Colloidal quantum dots achieve high TCR for room-temperature infrared photodetection. This novel thermistor platform offers enhanced performance without complex fabrication, advancing mid- and long-wave infrared detector technology.

Keywords:
bolometercolloidal quantum dotmetamaterial absorberpotential barrierthermistor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Bolometric detection enables room-temperature infrared photodetection by measuring resistance changes.
  • Conventional thermistors (VOx, a-Si) have limited temperature coefficient of resistance (TCR).
  • Quantum well thermistors offer higher TCR but involve costly epitaxial growth and defects.

Purpose of the Study:

  • To develop a novel thermistor platform for enhanced room-temperature infrared photodetection.
  • To overcome limitations of conventional thermistors using colloidal quantum dots (CQDs).
  • To achieve high TCR values and enable wavelength-selective detection in the MWIR/LWIR spectrum.

Main Methods:

  • Utilized lead chalcogenide colloidal quantum dots (CQDs) as the thermistor material.
  • Tuned CQD size and surface chemistry to engineer thermal activation energy and modulate TCR.
  • Integrated CQD thermistors with plasmonic metamaterial absorbers (PMAs) for photodetection.

Main Results:

  • Achieved high TCR values up to -9%/K using CQDs, surpassing conventional materials.
  • Demonstrated room-temperature, wavelength-selective photodetection in the MWIR/LWIR spectrum.
  • Developed bolometer detectors with a time constant of ~8 ms and detectivity approaching 10^6 Jones at 9 µm without MEMS.

Conclusions:

  • CQD-based thermistors offer a promising, cost-effective route to high-performance infrared detectors.
  • The lattice-mismatch-free nature of CQDs circumvents defect issues in quantum well devices.
  • This technology advances room-temperature, uncooled bolometric detection for MWIR/LWIR applications.