Related Experiment Video
Updated: May 21, 2026
09:48
Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Pressure and temperature spin crossover sensors with optical detection.
Jorge Linares1, Epiphane Codjovi, Yann Garcia
1GEMaC-CNRS, UMR 8635, Université de Versailles St Quentin en Yvelines, Versailles, France. jorge.linares@physique.uvsq.fr
Sensors (Basel, Switzerland)
|June 6, 2012
Summary
Iron(II) spin crossover materials can act as sensors. Materials with gradual transitions, previously overlooked, show promise for optical temperature and pressure sensing applications.
Area of Science:
- Materials Science
- Chemistry
Background:
- Spin crossover (SCO) molecular materials feature coordination centers switchable between high-spin (HS) and low-spin (LS) states.
- The magnetic state is monitored by the high-spin fraction (n(HS)), with a transition temperature T(1/2) indicating 50% switching.
- SCO materials exhibit thermo/piezochromic effects, enabling optical detection of spin state changes.
Purpose of the Study:
- To explore the potential of SCO molecular materials as temperature and pressure sensors.
- To highlight SCO materials with gradual transitions for sensing applications.
Main Methods:
- Investigated the switching behavior of Iron(II) spin crossover materials under varying temperature and pressure.
- Focused on materials exhibiting smooth spin transitions, often disregarded for applications.
Main Results:
- Spin crossover materials can be utilized for optical temperature and pressure sensing.
- Materials with gradual spin transitions are identified as promising candidates for sensor development.
Conclusions:
- SCO molecular materials offer a viable platform for optical sensing.
- Further investigation into SCO materials with smooth transitions is warranted for sensor applications.
Related Concept Videos
01:20Pressure Gauges
Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
01:08Spin–Spin Coupling Constant: Overview
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
03:02Constant Pressure Calorimetry
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...
01:16Measurement of Fluid Pressure
Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
01:14Temperature Measurement Sites
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...
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...