Synthesis of g-C 3N 4 nanosheet modified SnO 2 composites with improved performance for ethanol gas sensing

Author(s): Jianliang Cao ¹ ^, ² ^, ³ ^, ⁴ , Cong Qin ¹ ^, ² ^, ³ ^, ⁴ , Yan Wang ⁵ ^, ⁶ ^, ² ^, ³ ^, ⁴ , Huoli Zhang ¹ ^, ² ^, ³ ^, ⁴ , Bo Zhang ⁷ ^, ² ^, ³ ^, ⁴ , Yuxiao Gong ¹ ^, ² ^, ³ ^, ⁴ , Xiaodong Wang ⁷ ^, ² ^, ³ ^, ⁴ , Guang Sun ⁷ ^, ² ^, ³ ^, ⁴ , Hari Bala ⁷ ^, ² ^, ³ ^, ⁴ , Zhanying Zhang ⁷ ^, ² ^, ³ ^, ⁴

Publication date (Electronic): 2017

Journal: RSC Advances

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Considering the facile effective synthesis approach and high gas sensing performance for ethanol vapor, the g-C ₃N ₄ nanosheet modified SnO ₂ composite will be an ideal candidate for ethanol gas sensor applications.

Abstract

The composites of SnO ₂ have attracted much interest in the last few years due to their excellent sensing properties. A series of composites were prepared with two-dimensional (2D) g-C ₃N ₄ nanosheet modified SnO ₂ by a simple hydrothermal method in this work. The as-prepared composites were characterized by the techniques of powder X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), N ₂ sorption and X-ray photoelectron spectroscopy (XPS). The gas sensing measurement results indicated that the sensor based on g-C ₃N ₄/SnO ₂ composite showed high sensitivity and excellent selectivity for detection of ethanol vapor. At 500 ppm of ethanol vapor, the response value ( R _a/ R _g) of 5 wt% 2D g-C ₃N ₄ modified SnO ₂ was 240 at 300 °C. Therefore, the g-C ₃N ₄/SnO ₂ composites have a great potential ethanol gas sensing application.