Abstract
Indoor air pollution can induce adverse health effects on building occupants and pose a significant role in health worldwide. To avoid such effects, it is extremely important to monitor and control common indoor pollutants such as CO2, VOCs, and relative humidity. Therefore, this work focuses on recent advances in the field of graphene-based gas sensors, emphasizing the use of modified graphene that broadly expands the range of nanomaterials sensors. Graphene films were grown on copper by chemical vapor deposition (CVD) and transferred to arbitrary substrates. After synthesis, the samples were functionalized with Al2O3 by ALD and characterized by a large set of experimental techniques such as XPS, Raman, and SEM. The results demonstrated that graphene was successfully synthesized and transferred to SiO2, glass, and polymer. As a proof-of-concept, ALD of Al2O3 was performed on the graphene surface to produce a graphene/metal oxide nanostructure towards the development of nanocomposites for gas sensing. From this perspective, a laboratory prototype device based on measuring the electrical properties of the graphene sample as a function of the gas absorption is under development.
Highlights
Volatile organic compounds (VOCs), particulates (PM) of diverse sizes and microbial contaminants deteriorate indoor air quality (IAQ) and have subsequent effects on human health [1]
Three important features were observed in the Raman spectra and they are common to both samples; Dband is usually associated with the density of defects present in the graphene network, that is, the intensity of the D band is directly related to the concentration of defects
The Atomic Layer Deposition (ALD) of Al2O3 does not affect the intrinsic properties of the graphene demonstrated by the similarities of the Raman measurements
Summary
Volatile organic compounds (VOCs), particulates (PM) of diverse sizes and microbial contaminants deteriorate indoor air quality (IAQ) and have subsequent effects on human health [1]. Devices that can measure and monitoring chemical-, physical- and biological- changes in the environment, with low cost, compact size, and low-power consumption have been developed under the form of sensors. Due to its unique structure, uncommon chemical and physical properties, good conductivity and large specific surface area graphene based sensors performed well with good accuracy, rapidness, high sensitivity and selectivity, low detection limits, and long term stability [16]. Nanostructures have a high surface-to-volume ratio, which is one of the most important characteristics of a material to be used for gas sensing and provides large active surface area for the interaction of gas molecules This strongly favors the adsorption of gases on nanostructures and leads to highly sensitive sensors performance [32]. The synthesis of graphene can be divided into two main categories: physical- and chemical methods as shown in
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