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NH3 Sensor Based on 2D Wormlike Polypyrrole/Graphene Heterostructures for a Self-Powered Integrated System.

Jianmei Gao1,2, Jieqiong Qin3,4,2, Junyu Chang1,2

  • 1Department of Instrumentation and Analytical Chemistry, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

ACS Applied Materials & Interfaces
|August 19, 2020
PubMed
Summary

This study introduces an ultrasensitive ammonia (NH3) sensor using 2D wormlike mesoporous polypyrrole/reduced graphene oxide (w-mPPy@rGO) heterostructures. The novel material offers improved performance and potential for self-powered, portable NH3 monitoring systems.

Keywords:
high responsepolypyrrole/graphene heterostructuresself-powered integrated systemultrasensitivewormlike mesoporous

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Area of Science:

  • Materials Science
  • Chemical Sensors
  • Nanotechnology

Background:

  • Developing advanced active materials and integrated systems is crucial for sensitive ammonia (NH3) detection.
  • Existing sensors face challenges in sensitivity, selectivity, and long-term stability, limiting practical applications.

Purpose of the Study:

  • To develop an ultrasensitive ammonia (NH3) sensor utilizing novel two-dimensional (2D) wormlike mesoporous polypyrrole/reduced graphene oxide (w-mPPy@rGO) heterostructures.
  • To investigate the structure-property relationships governing the enhanced sensing performance of the w-mPPy@rGO heterostructures.
  • To demonstrate the potential for integrating the developed sensor into a self-powered system for practical NH3 monitoring.

Main Methods:

  • Synthesis of 2D wormlike mesoporous polypyrrole/reduced graphene oxide (w-mPPy@rGO) heterostructures using a soft template method.
  • Characterization of the synthesized materials, including their morphology, surface area, and structural properties.
  • Fabrication and testing of NH3 sensors based on w-mPPy@rGO, comparing their performance against spherical and nonporous counterparts.
  • Assembly of a self-powered sensor system incorporating a nanogenerator, battery, and the w-mPPy@rGO sensor.

Main Results:

  • The 2D w-mPPy@rGO heterostructure exhibited significantly higher response to NH3 (45% for 10 ppm) with a low detection limit (41 ppb) compared to other structures.
  • The enhanced performance is attributed to the large specific surface area (193 m²/g) of the 2D wormlike structure, facilitating gas diffusion and charge transport.
  • The sensor demonstrated excellent selectivity, anti-humidity interference, reversibility, and repeatability, along with successful integration into a self-powered system for detecting NH3 released from ammonium nitrate.

Conclusions:

  • The 2D w-mPPy@rGO heterostructures represent a promising active material for developing highly sensitive and selective NH3 sensors.
  • The structure-property coupling effect in the wormlike mesoporous architecture is key to improving gas sensing performance.
  • The developed self-powered sensor system shows great potential for practical, portable, and cost-effective NH3 monitoring, including explosive detection.