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Related Concept Videos

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Investigation of Electrocatalytic Methanol Oxidation Performance of Nickel Oxide Supported on Ternary CeLaCuO Nanoparticles.

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Highly Sensitive and Stable CeLaCuO/Ni-BTC MOF-Based Humidity Sensor for Plant Monitoring.

Jolina Rodrigues1, Karthik Chimatahalli Santhakumar1,2, Hamid Nawaz1

  • 1Department of Mechanical and Nuclear Engineering, Khalifa University of Science and Technology, Main Campus, Abu Dhabi, P.O. Box 127788, UAE.

ACS Applied Materials & Interfaces
|December 6, 2025
PubMed
Summary
This summary is machine-generated.

A novel composite humidity sensor using CeLaCuO and a Ni-BTC metal-organic framework (MOF) shows superior performance. This advanced sensor offers faster response, lower hysteresis, and excellent stability for real-time humidity monitoring in agriculture and environmental applications.

Keywords:
CeLaCuO/Ni-BTC compositeMOF-based sensorscerium oxidehumidity sensingplant health monitoringternary metal oxide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Accurate humidity sensing is crucial for various applications, including agriculture and environmental monitoring.
  • Existing humidity sensors often face challenges with response time, hysteresis, and long-term stability.
  • Metal-organic frameworks (MOFs) offer unique properties for sensor development due to their high surface area and tunable structures.

Purpose of the Study:

  • To develop a high-performance humidity sensor by integrating oxygen-vacancy-rich CeLaCuO with a porous Ni-BTC metal-organic framework (MOF).
  • To evaluate the sensor's performance characteristics, including response value, hysteresis, response/recovery time, stability, sensitivity, linearity, and temperature cross-sensitivity.
  • To demonstrate the practical applicability of the composite sensor in real-world agricultural monitoring.

Main Methods:

  • Fabrication of a composite humidity sensor using CeLaCuO and Ni-BTC MOF.
  • Characterization of the sensor's performance under varying relative humidity (RH) levels and temperatures.
  • Testing the sensor's long-term stability and response/recovery dynamics.
  • Application testing in a microclimate chamber to monitor humidity around strawberry plants.

Main Results:

  • The CeLaCuO/Ni-BTC composite sensor demonstrated a higher response value (24% @ 32% RH), lower hysteresis (0.465%RH), and faster response/recovery times (24.5/47.8 s) compared to individual components.
  • The sensor exhibited excellent long-term stability (<2.6% over 60 days), high sensitivity (≈1.35/%RH), and good linearity (R² = 0.9868) across 11-63% RH.
  • Low temperature cross-sensitivity (<0.35%) was observed between 25 and 100 °C.
  • The sensor successfully monitored humidity levels around strawberry plants, correlating with optimal plant transpiration and health.

Conclusions:

  • The synergistic integration of oxygen vacancies in CeLaCuO and the porous Ni-BTC MOF significantly enhances humidity sensing performance.
  • The developed composite sensor offers a promising solution for next-generation real-time humidity monitoring.
  • Potential applications include precision agriculture, smart greenhouses, environmental monitoring, and indoor climate control.