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High-performance ammonia sensor at room temperature based on 2D conductive MOF Cu3(HITP)2

  • 0School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, 561113, China; Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Military Medical Sciences Academy, Tianjin, 300050, China.
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December 1, 2024

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December 1, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

This study presents a new room-temperature ammonia sensor using metal-organic framework Cu3(HITP)2 nanomaterials. The sensor demonstrates high sensitivity and a low detection limit for environmental ammonia monitoring.

Area Of Science

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background

  • Sensitive ammonia detection is vital for environmental and health safety.
  • Resistive sensors with gold electrodes and gas-sensitive materials are common for gas detection.
  • Metal-organic frameworks (MOFs) offer tunable properties for gas sensing applications.

Purpose Of The Study

  • To develop a room-temperature resistive sensor for sensitive and selective ambient ammonia detection.
  • To investigate the gas-sensing performance of two-dimensional layer-stacked MOF Cu3(HITP)2 nanomaterials.
  • To characterize the sensor's response, selectivity, limit of detection, and stability.

Main Methods

  • Fabrication of a sensor by drop-coating Cu3(HITP)2 nanomaterials onto gold-forked finger electrodes.
  • Utilizing density-functional theory (DFT) simulations for theoretical characterization.
  • Conducting gas-sensitive performance testing, including dynamic response and recovery measurements.

Main Results

  • The Cu3(HITP)2 sensor achieved a 91.4% response to 100 ppm ammonia at room temperature.
  • Demonstrated a low limit of detection (LOD) of approximately 15 ppb.
  • Exhibited fast response (26 s) and recovery (20 s) times, along with excellent reproducibility and stability.

Conclusions

  • The layer-stacked Cu3(HITP)2 MOF material is a promising candidate for room-temperature ammonia sensing.
  • The sensor's performance is attributed to abundant Cu active sites and the framework structure facilitating electron transfer.
  • Drop-coating Cu3(HITP)2 onto gold electrodes is a feasible strategy for developing effective ammonia sensors.

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