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Ultrasensitive resistivity-based ethanol sensor based on the use of CeO2-Fe2O3 core-shell microclusters

Authors
  • Jayababu, Nagabandi1
  • Poloju, Madhukar1
  • Shruthi, Julakanti1
  • Reddy, Musugu Venkata Ramana1
  • 1 Osmania University, Thin Films and Nano Materials Research Laboratory, Department of Physics, Hyderabad, Telangana State, 500007, India , Hyderabad (India)
Type
Published Article
Journal
Microchimica Acta
Publisher
Springer-Verlag
Publication Date
Oct 24, 2019
Volume
186
Issue
11
Identifiers
DOI: 10.1007/s00604-019-3809-7
Source
Springer Nature
Keywords
License
Yellow

Abstract

This paper presents a method for synthesis of CeO2-Fe2O3 core-shell nanoparticles (CSNPs). These are shown to display enhanced ethanol sensing properties. Synthesis was done via a two-step process, starting with co-precipitation and followed by applying a sol-gel method. High resolution electron microscopy results revealed the core-shell nature of the particles. Surface morphological studies of the CSNPs showed a microcluster-like structure which is assumed to be responsible for the enhanced sensing response. X-ray photoelectron spectroscopy revealed valence states of Fe(III) and Ce(IV). The material was used in a resisitive sensor for ethanol vapor at room temperature (RT), at a typically applied voltage of 5 V. The response of the sensor is higher than that of pristine CeO2 or Fe2O3 sensors towards 100 ppm of ethanol at RT. The lower detection limit is 1 ppm (with a signal change of 23). The response and recovery times are as short as 3 and 7 s, respectively. The sensing mechanism is discussed in detail with respect to n-n heterojunctions formed between n-CeO2 and n-Fe2O3, high catalytic activity of the Fe2O3, and microcluster-like structures of the particles. Graphical abstractSchematic representation of gas sensing mechanism of CeO2-Fe2O3 core-shell nanoparticles (c) along with their morphological images (a&b).

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