Efficient Heterostructures of Ag@CuO/BaTiO3 for Low-Temperature CO2 Gas Detection: Assessing the Role of Nanointerfaces during Sensing by Operando DRIFTS Technique,ACS Applied Materials & Interfaces

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Efficient Heterostructures of Ag@CuO/BaTiO3 for Low-Temperature CO2 Gas Detection: Assessing the Role of Nanointerfaces during Sensing by Operando DRIFTS Technique
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-08-07 00:00:00 , DOI: 10.1021/acsami.7b07051
Shravanti Joshi _{1,

2} , Samuel J. Ippolito _{1,

2} , Selvakannan Periasamy _{1,

2} , Ylias M. Sabri _{1,

2} , Manorama V. Sunkara _{1,

2}

Affiliation

Tetragonal BaTiO₃ spheroids synthesized by a facile hydrothermal route using Tween 80 were observed to be polydispersed with a diameter in the range of ∼15–75 nm. Thereon, BaTiO₃ spheroids were decorated with different percentages of Ag@CuO by wet impregnation, and their affinity toward carbon dioxide (CO₂) gas when employed as sensitive layers in a microsensor was investigated. The results revealed that the metal nanocomposite-based sensor had an exceptional stability and sensitivity toward CO₂ gas (6-fold higher response), with appreciable response and recovery times (<10 s) and higher repeatability (98%) and accuracy (96%) at a low operating temperature of 120 °C, compared to those of pure BaTiO₃ and CuO. Such improved gas-sensing performances even at a very low concentration (∼700 ppm) is attributable to both the chemical and electrical contributions of Ag@CuO forming intermittent nanointerfaces with BaTiO₃ spheroids, exhibiting unique structural stability. The CO₂-sensing mechanism of CuO/BaTiO₃ nanocomposite was studied by the diffuse reflectance infrared Fourier transform spectroscopy technique that established the reaction of CO₂ with BaO and CuO to form the respective carbonate species that is correlated with the change in material resistance consequently monitored as sensor response.

中文翻译：

Ag @ CuO / BaTiO _3的高效异质结构用于低温CO ₂气体检测：通过Operando DRIFTS技术评估纳米界面在传感过程中的作用

使用Tween 80通过便捷的热液路线合成的四方BaTiO ₃球体被观察到直径约15-75 nm的多分散体。在其上，通过湿法浸渍用不同百分比的Ag @ CuO修饰BaTiO ₃球体，并研究了它们在微传感器中用作敏感层时对二氧化碳（CO ₂）气体的亲和力。结果表明，基于金属纳米复合材料的传感器对CO ₂气体具有出色的稳定性和灵敏性（响应提高了6倍），响应和恢复时间（<10 s）明显，重复性更高（98％）和准确性（96）％）在120°C的低工作温度下，与纯BaTiO _3相比和CuO。即使在非常低的浓度（约700 ppm）下，这种改善的气敏性能也归因于Ag @ CuO与BaTiO ₃球体形成间歇性纳米界面的化学和电学贡献，表现出独特的结构稳定性。通过漫反射红外傅里叶变换光谱技术研究了CuO / BaTiO ₃纳米复合材料的CO ₂传感机理，该技术建立了CO ₂与BaO和CuO的反应，形成了各自的碳酸盐物质，从而与材料电阻的变化相关。作为传感器响应进行监视。

更新日期：2017-08-07

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