AUTHOR=Gao Xin , Zhou Qu , Lu Zhaorui , Xu Lingna , Zhang Qingyan , Zeng Wen 

TITLE=Synthesis of Cr2O3 Nanoparticle-Coated SnO2 Nanofibers and C2H2 Sensing Properties

JOURNAL=Frontiers in Materials

VOLUME=6

YEAR=2019

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00163

DOI=10.3389/fmats.2019.00163

ISSN=2296-8016

ABSTRACT=<p>In this work, Cr<sub>2</sub>O<sub>3</sub> nanoparticles, and SnO<sub>2</sub> nanofibers were fabricated by a sol–gel process and an electrospinning method, respectively. Gas sensitive materials with high sensitivity to C<sub>2</sub>H<sub>2</sub> gas were obtained by coating Cr<sub>2</sub>O<sub>3</sub> nanoparticles on SnO<sub>2</sub> nanofibers. The prepared Cr<sub>2</sub>O<sub>3</sub> nanoparticle-coated SnO<sub>2</sub> nanofibers (Cr<sub>2</sub>O<sub>3</sub> NPs. coated SnO<sub>2</sub> NFs.) were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and the gas sensing behaviors to C<sub>2</sub>H<sub>2</sub> were studied. The Cr<sub>2</sub>O<sub>3</sub> NPs. coated SnO<sub>2</sub> NFs. exhibited low optimal operating temperature, high sensing response, excellent response-recovery time, and long-term stability to C<sub>2</sub>H<sub>2</sub>. The optimal operating temperature of the measured material to 20 ppm C<sub>2</sub>H<sub>2</sub> was about 220°C and the C<sub>2</sub>H<sub>2</sub> concentration had a good linear relationship with the response value when the concentration was 60 ppm. In addition, a reasonable gas sensing mechanism was proposed which may enhance the gas sensing performances for the Cr<sub>2</sub>O<sub>3</sub> NPs. coated SnO<sub>2</sub> NFs. to C<sub>2</sub>H<sub>2</sub>.</p>