Heat-pulse assisted NH3 gas sensing based on cuprous oxide nanoparticles anchored on reduced graphene oxide nanosheets

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Abstract

In this report, reduced graphene oxide (RGO)–cuprous oxide (Cu2O) nanocomposites are prepared as sensing layer via a combination of hydrothermal method and airbrush technology for NH3 gas detection at low temperature (≤ 100 °C). A variety of characterization techniques such as SEM, TEM, XRD, FTIR and XPS were employed to probe morphological and componential properties of the obtained nanocomposites. By introducing a 70 °C heat pulse with duration period of 5 s (i.e., 5 s@70 °C) upon the beginning of NH3 desorption, it was noteworthy that the as-prepared sensors eventually showed a full and swift recovery within 26 s, which was considerably improved in comparison to a partial and sluggish one (77% recovery within 10 min) in absence of this treatment. Moreover, a good repeatability was achieved toward seven consecutive 150 ppm NH3 exposures, accompanied with a negligible baseline drift. Temperature-dependent sensing performances demonstrated that RGO–Cu2O sensors exhibited an enhanced sensing response one order of magnitude larger than pure RGO counterparts at each temperature (25, 60, and 100 °C), wherein 60 °C was considered as the optimal operation temperature. A modest selectivity toward NH3 was revealed against numerous interference gases.

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Notes

Acknowledgements

This work was partially supported by National Natural Science Foundation of China (Grant No. 61704014), Fundamental Research Funds for the Central Universities (Grant Nos. 106112016CDJXY120006 and 0903005203275) and National Key Research and Development Program of China (Grant No. 2016YFF0102802).

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© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic EngineeringChongqing UniversityChongqingPeople’s Republic of China
  2. 2.School of Pharmaceutical Sciences and Innovative Drug Research CentreChongqing UniversityChongqingPeople’s Republic of China
  3. 3.Chongqing Research Institute CO., Ltd. of China Coal Technology & Engineering GroupChongqingPeople’s Republic of China

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