Enhanced trimethylamine sensing properties of ternary rGO/MoO 3 /Au hybrid nanomaterials
- PDF / 2,258,716 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 65 Downloads / 230 Views
Enhanced trimethylamine sensing properties of ternary rGO/MoO3/Au hybrid nanomaterials Jing Sun1, Peng Song1,*, Dong Liang1, Jingqun Zhang1, and Qi Wang1,* 1
School of Material Science and Engineering, University of Jinan, Jinan 250022, China
Received: 15 July 2020
ABSTRACT
Accepted: 30 September 2020
Recently, rGO has been widely used in gas-sensitive research because of its high conductivity and large specific surface area. In this paper, rGO/MoO3 nanocomposites were first synthesized via a hydrothermal method, and then the ternary rGO/MoO3/Au hybrid nanomaterials were synthesized by adding Au nanoparticles. Its structure and morphology were fully characterized by SEM, TEM, EDS, XRD, TG and other methods and the results show that the three components are well combined. Then rGO/MoO3/Au gas sensors were prepared and their performance was tested. 160 °C is the optimal operating temperature, and the response to 10 ppm TMA can reach 68.5 at this temperature, which is much higher than pure MoO3 and rGO/MoO3. At the same time, it has good selectivity and repeatability. The reason is that the p–n heterojunction generated at the interface between rGO and MoO3 and the catalytic activity of precious metal Au nanoparticles can improve the gas-sensitive properties of the material.
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction As far as the current situation is concerned, environmental pollution is becoming increasingly serious and has endangered human life and health [1, 2]. As an irritating and toxic gas which secreted by dead fish, trimethylamine (TMA) will undoubtedly pose a great threat to the environment and the human body. Exposure to TMA gas for long time may cause headaches, nausea, and irritation to the eyes and respiratory system [3–5]. Therefore, the detection of TMA at the ppm level is very important for detecting the freshness of fish and environmental conditions [6]. From the perspective of the detection method, the
semiconductor metal oxide gas sensor is a widely used method because it has low cost [7], long life [8], sensitive response [9] and other advantages. As a typical n-type semiconductor with wide bandgap [10], MoO3 has great application prospects in the fields of gas sensing and photocatalysis [11, 12]. Gas sensors based on a single type of oxide still have many disadvantages such as poor selectivity and high operating temperature [13, 14]. In consequence, it has become a research hotspot to improve the gassensitivity performance through doping, compounding or noble metal modification. With the development of science and technology, reduced graphene oxide (rGO) is used as a composite
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04575-1
J Mater Sci: Mater Electron
material in the gas sensing field by reason of its high conductivity, large specific surface area and excellent electron transport ability [15, 16]. Simultaneously, the high operating temperature of metal oxide materials is
Data Loading...
