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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

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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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Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation
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Large-Area and Visible-Light-Driven Heterojunctions of In2O3/Graphene Built for ppb-Level Formaldehyde Detection at

Lanpeng Guo1,2, Hongping Liang1,2, Huiyun Hu1,2

  • 1Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.

ACS Applied Materials & Interfaces
|March 31, 2023
PubMed
Summary

This study presents a new sensor for detecting formaldehyde (HCHO) at ppb levels using indium oxide nanorods and graphene. The sensor operates effectively at room temperature under visible light, offering accurate and convenient indoor air quality monitoring.

Keywords:
In2O3 nanorodsformaldehyde sensingroom temperaturesupramolecularly functionalized graphenevisible-light-driven heterojunctions

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Area of Science:

  • Materials Science
  • Chemical Sensors
  • Nanotechnology

Background:

  • Indoor formaldehyde (HCHO) detection at ppb levels is crucial for health.
  • Existing sensors often lack sensitivity, convenience, or room-temperature operation.
  • Developing efficient HCHO sensors is an ongoing challenge.

Purpose of the Study:

  • To develop a convenient and accurate ppb-level formaldehyde gas sensor.
  • To utilize visible-light-driven (VLD) heterojunctions for enhanced sensing.
  • To achieve ultrasensitive HCHO detection at room temperature.

Main Methods:

  • Fabrication of InAG sensors using ultrasmall In2O3 nanorods and functionalized reduced graphene oxide.
  • Utilizing 405 nm visible light illumination for sensor operation.
  • Testing sensor performance including limit of detection, response, recovery, selectivity, and stability.

Main Results:

  • The InAG sensor demonstrated an ultralow practical limit of detection (pLOD) of 5 ppb for HCHO.
  • Achieved high response (Ra/Rg = 2.4 at 500 ppb) and selectivity at room temperature.
  • Showcased relatively short response/recovery times (119 s/179 s) and long-term stability.

Conclusions:

  • Ultrasmall In2O3 nanorods and functionalized graphene form effective VLD heterojunctions for HCHO sensing.
  • The developed InAG sensor is practical and reliable for ppb-level formaldehyde detection.
  • This work offers a strategy for low-power-consumption ppb-level gas sensors.