Synthesis and Screen Printing of Dopant Free Nano-crystalline SnO2 (101) Thick Film for Gas Sensor Application

Anil D. Garje1,*, Manoj Mayaji Ovhal1,2, Shweta Mishra1, Namrata Bagwe1

1Department of Physics, Sir Parashurambhau College, Pune 411030, Maharashtra, India

2Flexible and Printable Electronics, Jeonbuk National University, Jeonju, South Korea 

Adv. Mater. Lett., 2020, 11 (12), 20121588

DOI: 10.5185/amlett.2020.121588

Publication Date (Web): Nov 09, 2020

E-mail: adgarje@gmail.com

Abstract


Nano-crystalline tin (II) oxide (SnO2) was successfully synthesized by a simple and cost-effective surfactant assisted solution precipitation technique. The structural, optical, and morphological characterization of as synthesized nano-crystalline SnO2 was confirmed by X-Ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectroscopy, and transmission electron microscopy (TEM). The nano-crystalline SnO2 possesses tetragonal lattice structure (rutile phase) with preferential growth along (101) plane and average crystallite size of 8 ±2 nm were confirmed by XRD Rietveld refinement. The TEM images were showed quasi spherical particles with average particle size of 10 ±2 nm. The optical energy band gap of 3.76 eV confirms the electronic conduction mechanism in SnO2. Furthermore, the synthesized nano-crystalline SnO2 with 15 wt % glass frit was used as a functional material to fabricate thick film sensors using cost-effective screen printing method.  The sensor shows high sensitivity towards H2, CO, and LPG selectively at optimal operating temperatures of 120, 150 and 70 oC respectively for 100 ppm concentration of each gas. The improvement in sensitivity, selectivity, and stability at low operating temperature and their correlation with the nano-crystalline SnO2 (101) plane, small particle size and optical band gap were also envisaged along with repeatability, reproducibility, calibration, and aging effect.

Keywords

Solution precipitation, tin oxide, screens printing, thick film, gas sensor.

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