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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
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Highly Selective Hybrid InSe-Graphene for NO2 Gas Sensing with High Humidity Tolerance.

Jyayasi Sharma1,2,3, Frank Güell4, Mubdiul Islam Rizu1,2,3

  • 1MINOS, School of Engineering, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain.

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|July 1, 2025
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Summary
This summary is machine-generated.

A novel hybrid Indium Selenide-graphene gas sensor demonstrates high selectivity for nitrogen dioxide (NO2). Produced via Liquid Phase Exfoliation (LPE), this sensor shows enhanced responsiveness under humid conditions.

Keywords:
InSegas sensorgraphenehumidityliquid phase exfoliation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Development of selective gas sensors is crucial for environmental monitoring and industrial safety.
  • Indium Selenide (InSe) and graphene are promising 2D materials for gas sensing applications.
  • Hybrid materials can offer synergistic properties for enhanced sensor performance.

Purpose of the Study:

  • To develop a highly selective chemoresistive gas sensor for nitrogen dioxide (NO2).
  • To investigate the gas-sensing properties of pristine Indium Selenide (InSe), pristine graphene, and a hybrid InSe-graphene material.
  • To evaluate the sensor performance under varying humidity and operating temperatures.

Main Methods:

  • Fabrication of p-type pristine InSe, pristine graphene, and hybrid InSe-graphene using Liquid Phase Exfoliation (LPE) at 35 °C.
  • Deposition of materials onto alumina transducers for chemoresistive gas sensor fabrication.
  • Material characterization using X-ray diffraction (XRD), FESEM, HRTEM, photoluminescence (PL), and Raman spectroscopy.
  • Gas-sensing performance evaluation with varying NO2 concentrations, humidity, and operating temperatures.

Main Results:

  • HRTEM confirmed the multilayered crystalline structure of the fabricated materials.
  • The hybrid InSe-graphene sensor exhibited a three-fold higher response to 1 ppm NO2 compared to pristine graphene; pristine InSe showed no response.
  • Sensor response to 1 ppb NO2 increased from 3.41% (dry) to 6.16% (150 °C, 50% RH) and 14.42% (250 °C, 50% RH), indicating enhanced sensitivity under humid conditions.

Conclusions:

  • The hybrid InSe-graphene material is a promising candidate for highly selective and sensitive NO2 gas detection.
  • The LPE technique offers an environmentally friendly approach for synthesizing these advanced sensor materials.
  • The sensor's performance is significantly enhanced by humidity, suggesting potential for operation in diverse environmental conditions.