Prepared gold-modified hollow nanosphere Co3O4/rGO composites for low concentration H2S gas detection

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-09-24 DOI:10.1016/j.ceramint.2024.09.305

Lihong Liu , Ming Yang , Bo Li , Duo zhang , Lihua Huo

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Abstract

In this paper, Au-modified Co₃O₄ hollow nanospheres/graphene composites (Au-Co₃O₄/rGO) were synthesized for the first time through a novel “one-pot cooking” method at ambient temperature. The hollow nanospheres exhibited a particle size of approximately 10–15 nm, while the modified Au nanoparticles were about 4–5 nm in diameter. A high-efficiency and high response H₂S gas sensor was constructed based on Au-Co₃O₄/rGO ternary composites. The effects of different Au modifying mass ratios on the H₂S gas-sensitive performance of the composites were systematically investigated. At an operational temperature of 92 °C, the Au-Co₃O₄/rGO sensor, incorporating an Au loading mass ratio of 1.3 wt%, exhibited a response value of 175.4 for H₂S at 100 ppm, a recovery time of 30 s, and a detection limit reaching as low as 10 ppb. This response was tripled compared to the undoped Co₃O₄/rGO sensor. At the same time, the H₂S sensing mechanism by Au-Co₃O₄/rGO was discussed in detail.

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制备用于低浓度 H2S 气体检测的金改性中空纳米 Co3O4/rGO 复合材料

本文通过一种新颖的 "一锅煮 "方法，首次在常温下合成了金修饰 Co3O4 中空纳米球/石墨烯复合材料（Au-Co3O4/rGO）。空心纳米球的粒径约为 10-15 纳米，而修饰的金纳米颗粒的直径约为 4-5 纳米。基于 Au-Co3O4/rGO 三元复合材料构建了一种高效率、高响应的 H2S 气体传感器。系统研究了不同金修饰质量比对复合材料 H2S 气敏性能的影响。在 92 °C 的工作温度下，金负载质量比为 1.3 wt% 的 Au-Co3O4/rGO 传感器对浓度为 100 ppm 的 H2S 的响应值为 175.4，恢复时间为 30 秒，检测限低至 10 ppb。与未掺杂的 Co3O4/rGO 传感器相比，这一响应提高了三倍。同时，还详细讨论了 Au-Co3O4/rGO 的 H2S 传感机制。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.