Influence of fuel to oxidizer ratio on gas sensing characteristics of ZnFe2O4 nanoparticles

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS) Pub Date : 2015-03-07 DOI:10.1109/ISPTS.2015.7220101

R. Godbole, V. Godbole, P. Rao, P. Alegaokar, S. Bhagwat

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Abstract

Highly porous zinc ferrite (ZnFe2O4) nano-size powders are synthesized by varying fuel to oxidizer ratio. The metal nitrates are used as oxidizers while glycine is used as a fuel. The synthesis of material is carried out using an auto-combustion method. It is observed that the enhancement of magnetization occur with the enhancement of `Fuel to Oxidizer' ratio i.e. Glycine to metal Nitrate (G/N) ratio. The structural, morphological, and magnetic features of samples are studied using XRD, SEM, EDAX, BET and VSM techniques. At the microscopic level, the materials exhibit a formation of spongelike structure containing nano-size particles. The XRD measurements confirm the formation of single phase spinel structure of zinc ferrite (ZnFe2O4). As a case study, the response of materials to ethanol gas is studied. It is observed that higher G/N ratio lead to lowering of gas sensitivity as well as operating temperature. The results are discussed in terms of reactions of surface oxygen with ethanol gas.

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燃料与氧化剂比对ZnFe2O4纳米颗粒气敏特性的影响

采用不同燃料与氧化剂比的方法合成了多孔铁酸锌(ZnFe2O4)纳米粉体。金属硝酸盐用作氧化剂，而甘氨酸用作燃料。材料的合成采用自燃烧法进行。观察到磁化强度随“燃料与氧化剂”比率即甘氨酸与金属硝酸盐(G/N)比率的提高而增强。采用XRD、SEM、EDAX、BET和VSM等技术研究了样品的结构、形貌和磁性特征。在微观水平上，材料表现出含有纳米级颗粒的海绵状结构的形成。XRD测定证实了锌铁氧体(ZnFe2O4)形成了单相尖晶石结构。以乙醇气体为例，研究了材料对乙醇气体的响应。结果表明，G/N比值越高，气敏性越低，工作温度越低。从表面氧与乙醇气体反应的角度对结果进行了讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)

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