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, NO_2, 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 abstract

The 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.

中文翻译：

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改性的Sn掺杂LaCrO 3纳米结构：专注于其表征和在较低温度下作为乙醇传感器的应用

摘要

本工作强调使用不同浓度的锡对LaCrO ₃的结构性能和传感应用的影响。在这项工作中，用不同浓度的锡（0.2 M％，0.4 M％，0.6 M％和0.8 M％）修饰LaCrO ₃纳米结构。通过溶胶-凝胶法合成了不同的修饰Sn掺杂的LaCrO ₃，然后制备通过常规的丝网印刷方法生产厚膜。通过X射线衍射（XRD），能量色散X射线（EDX），扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行的表征揭示了掺Sn LaCrO ₃的确认。晶体结构及其形态。配制这些氧化物以鉴定各种空气污染物，例如CO ₂，乙醇，H ₂ S，NH ₃，NO ₂和丙酮。在150–250°C范围内，含0.4 M％Sn的Sn掺杂LaCrO3表现出对乙醇蒸气的更高气体响应。传感器还显示出适当的恢复能力和可接受的稳定性。

图形摘要

图形摘要说明了通过溶胶-凝胶法原位合成掺Sn的LaCrO ₃的过程。同样，它显示了其特征，最后，掺杂的Sn的厚膜显示出对乙醇的最佳选择性。