Abstract
Nanohybrids comprising graphene loaded with perovskite nanocrystals have been demonstrated as a potential option for sensing applications. Specifically, their combination presents an interesting synergistic effect owing to greater sensitivity when bare graphene is decorated with perovskites. In addition, since the main drawback of perovskites is their instability towards ambient moisture, the hydrophobic properties of graphene can protect them, enabling their use for ambient monitoring, as previously reported. However not limited to this, the present work provides a proof-of-concept to likewise employ them in a potential application as breath analysis for the detection of health-related biomarkers. There is a growing demand for sensitive, non-invasive, miniaturized, and inexpensive devices able to detect specific gas molecules in human breath. Sensors gathering these requirements may be employed as a screening tool for reliable and fast detection of potential health issues. Moreover, perovskite@graphene nanohybrids present additional properties highly desirable as the capability to be operated at room temperature (i.e., reduced power consumption), reversible interaction with gases (i.e., reusability), and long-term stability. Within this perspective, the combination of both nanomaterials, perovskite nanocrystals and graphene, possibly includes the main requirements needed, being a promising option to be employed in the next generation of sensing devices.
Highlights
Human breath is a complex matrix in which it is possible to find hundreds or even thousands of gas compounds [1]
Charges is neutralized at the defective perovskite surface, resulting in a decrease of the local hole (B) When halide perovskites interact with electron-acceptor gas, positive charges are formed at the nanocrystals, being concentration of the p-type graphene, and thereby the resistance increases. (B) When halide perovtransferred to the graphene
The graphene loading with perovskite nanocrystals been shown to been be a feasible nanomaterial for sensing applications, in which a synergistic effect between nanomaterial for sensing applications, in which a synergistic effect between both materi- both materials is created
Summary
Human breath is a complex matrix in which it is possible to find hundreds or even thousands of gas compounds [1]. Offer some drawbacks mass spectrometry optical sensors These reliable results,are still a challenge, preventing their implementation in industrial applications for exhaled being capable of detecting trace levels of gas species [10]. Different perovskite compositions, especially those that do not involve the use of oxides, have emerged as attractive nanomaterials to be employed in sensing studies [40] Their capability to operate at room temperature during the gas sensing has the same advantage as graphene-based sensors, enabling the development of simple and easyto-use devices by their combination. The present work comprises the main strategies for functionalizing graphene and their combination with perovskites to develop sensitive films for the detection of gas compounds susceptible to be biomarkers in human exhaled breath
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