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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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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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Updated: May 26, 2025

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Room-Temperature Bolometric Response in Nitro-Boosted rGO.

Jyoti Saini1, Mamta Raturi1, Manpreet Kaur1

  • 1Institute of Nano Science and Technology, Sector-81, Knowledge City, SAS Nagar, Punjab 140306, India.

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|February 21, 2025
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Summary

Researchers developed a flexible room-temperature microbolometer using reduced graphene oxide and chitosan. This novel graphene-based sensor overcomes previous limitations, offering enhanced sensitivity for infrared detection and thermal imaging applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Graphene-based bolometers are promising for thermal imaging and infrared detection due to their potential for high temperature coefficient of resistance (TCR) and fast response times.
  • Pristine graphene exhibits weak electron-phonon interactions at room temperature, limiting its sensitivity and temperature dependence of resistance.
  • Developing sensitive room-temperature graphene bolometers requires overcoming the challenge of suppressed electron-phonon scattering.

Purpose of the Study:

  • To propose and demonstrate a flexible microbolometer based on a reduced graphene oxide (rGO) and chitosan (CS) hybrid for room-temperature operation.
  • To investigate the role of nitrogen functional groups and defect-assisted scattering in enhancing the bolometric response.
  • To improve the TCR, current responsivity, and response time of graphene-based bolometers.

Main Methods:

  • Fabrication of a flexible microbolometer using a reduced graphene oxide (rGO) and chitosan (CS) hybrid.
  • Chitosan treatment to enhance nitrogen functional groups in rGO, creating defect centers for supercollision scattering.
  • Characterization of the microbolometer's performance, including TCR, current responsivity, and thermal response time near room temperature.

Main Results:

  • The rGO-CS hybrid microbolometer demonstrated a significant bolometric response at room temperature.
  • Nitrogen functional groups introduced via chitosan treatment promoted defect-assisted electron-phonon scattering (supercollision scattering), enhancing sensitivity.
  • Achieved a maximum TCR of ~3.1%/K, current responsivity of ~10.84 μA/W, and millisecond-range thermal response time.

Conclusions:

  • The developed nitro-boosted rGO-CS microbolometer effectively overcomes the limitations of weak electron-phonon interactions at room temperature.
  • Chitosan enhances nitrogen functionality and provides flexibility, leading to improved TCR and durability.
  • This work presents a novel pathway for high-performance room-temperature bolometers utilizing nitrogen-driven supercollision scattering in rGO-CS hybrids.