Modified Sn-doped LaCrO3 nanostructures: focus on their characterization and applications as ethanol sensor at a lower temperature

Vrushali Shyamrao Shinde,Chatur Pundalik Sawant,Kailas Haribhau Kapadnis

doi:10.1007/s40097-019-00314-z

Vrushali Shyamrao Shinde, Chatur Pundalik Sawant + Show 1 more

Open Access

https://doi.org/10.1007/s40097-019-00314-z

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Abstract

The present work emphasizes the effect of the use of Sn, with different concentrations, over the structural properties and sensing applications of LaCrO3. In this work, LaCrO3 nanostructures were modified with different concentration of Sn (0.2 M %, 0.4 M %, 0.6 M % and 0.8 M %).Different modified Sn-doped LaCrO3 was synthesized by sol–gel method and followed by preparation of thick films via a conventional screen printing approach. The characterizations done by means of X-ray diffraction (XRD), energy-dispersive X-ray (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the confirmation of a Sn-doped LaCrO3 crystal structure and its morphology, respectively. These oxides were formulated to identify various air pollutants such as CO2, ethanol, H2S, NH3, NO2, and acetone. The Sn-doped LaCrO3 with 0.4 M % Sn displayed higher gas response to ethanol vapor at the range of 150–250 °C. The sensors additionally demonstrated proper recovery and acceptable stability.Graphic abstractThe graphical abstract demonstrates the in situ synthesis of Sn-doped LaCrO3 by sol–gel method. Similarly, it shows its characterization and finally, the thick films of doped Sn demonstrate best selectivity for ethanol.

Highlights

The continuous increase in the release of the toxic pollutants from industries and vehicles in the environment has posed a threat to the human and other living beings surroundings globally
Lanthanum nitrate [La(NO3)3], chromium nitrate [Cr(NO3)3], tin chloride [Sn(Cl2)∙2H2O] and citric acid utilized in this synthesis are AR grade bought from Merck Chemicals and Modern Laboratories, Nashik, India
The spectrum was recorded by following the range of 2θ degrees between 20 and 80 to know the crystallite size and crystal structure of nanostructure

Summary

Introduction

The continuous increase in the release of the toxic pollutants from industries and vehicles in the environment has posed a threat to the human and other living beings surroundings globally In these circumstances, measures to tackle this global problem are necessary. Perovskite compounds, ABO3 (in which A = cation of alkali, alkaline earth, or lanthanide steel and B = cation of transition metal), have novel synthetic and physical properties such as oxidative, magnetic, conductive, refractive, luminescent and catalytic. With these significant and interesting attributes, these oxides have been widely used in electronic devices and plenty of other devices [2]. The first use of (Ln, M)BO3 (Ln—lanthanide element, M—alkaline earth metal, and B—transition metal) perovskite as a potential ethanol sensor was proposed by Obayashi et al [21]

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