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Zhu, J., Cao, Y., Chen, H., Fan, B., Zou, X., Cheng, J., & Zhang, C. (2024). Results in Chemistry, 7, 101444.
Single-layer graphene oxide (GO) was utilized in the fabrication of a high-performance resistive humidity sensor, demonstrating sub-second response and recovery times across a broad relative humidity (RH) range (10%-95%). This study highlights the significant potential of single-layer GO in the development of next-generation humidity sensors capable of real-time environmental monitoring.
The sensor was constructed using an ultrathin GO film formed by stacked single-layer sheets with over 99% monolayer purity and average lateral dimensions of 40 µm. Aqueous dispersions of single-layer GO at varying concentrations (0.8-2.4 mg/mL) were prepared via ultrasonic treatment and drop-cast onto parallel gold electrodes on quartz substrates. Following a natural drying process, the GO formed a uniform, ultra-thin conductive film that served as the active sensing layer.
Thanks to the hydrophilic oxygen-containing functional groups and the large surface area of single-layer GO, the device exhibited rapid adsorption and desorption of water molecules, enabling a response and recovery time of less than 1 s-an exceptional improvement over conventional humidity sensors. The outstanding sensitivity and speed are attributed to the fast charge transport across the GO network and its ultrathin morphology.
This work demonstrates that single-layer graphene oxide is an ideal material for constructing highly responsive humidity sensors, offering both fast kinetics and scalable fabrication for advanced sensing technologies in industrial, agricultural, and biomedical applications.
Li, Shuang-Ning, et al. Process Safety and Environmental Protection 178 (2023): 786-794.
Single-layer graphene oxide (SLGO) has been successfully employed in the construction of an electrochemical sensor for the sensitive and direct detection of phosphate (PO₄³⁻) anions in aqueous solutions. The application leverages the abundant oxygen-containing surface functionalities and high specific surface area of SLGO, which enhance the electrochemical response and binding affinity toward phosphate ions.
In this study, a glassy carbon electrode (GCE) was modified with a uniform coating of SLGO (2.0 mg/mL), forming the SLGO/GCE working electrode. Prior to modification, the GCE was meticulously polished and electrochemically activated to ensure a clean, conductive surface. The SLGO suspension was then drop-cast onto the GCE and allowed to dry under ambient conditions, forming a stable sensing interface.
Electrochemical characterizations confirmed the high conductivity and favorable electron-transfer kinetics of the SLGO-modified electrode. The presence of hydroxyl, epoxy, and carboxyl functional groups on SLGO facilitated specific interactions with phosphate ions, leading to a marked electrochemical signal that enabled quantitative detection. This method provides a direct, reagent-free, and efficient platform for phosphate sensing, which is critically important for environmental monitoring and water quality assessment.
This case study demonstrates that single-layer graphene oxide is a highly promising material for the development of advanced electrochemical sensors, offering excellent sensitivity, selectivity, and ease of fabrication for phosphate ion detection.
Ullah, Naveed, et al. Applied Surface Science 602 (2022): 154343.
Single-layer graphene oxide (SLGO) has been effectively employed in the preparation of hybrid transparent conductive electrodes by forming a composite with silver nanowires (AgNWs). This approach addresses key limitations of traditional metallic nanowire-based electrodes, such as poor environmental stability and weak adhesion to substrates, offering a promising pathway for next-generation optoelectronic devices.
In this study, AgNWs were first deposited onto polyethylene terephthalate (PET) or glass substrates and then immersed into a diluted SLGO/H₂O/IPA solution. The SLGO coating significantly enhanced the interfacial compatibility and stability of the AgNW network. The resulting AgNWs/SLGO composite electrode exhibited remarkable optical and electrical performance, achieving a high transmittance of 91% at 550 nm and a low sheet resistance of 11 Ω/sq. Importantly, no performance degradation was observed after two months of storage under ambient conditions.
Thermal stability tests under high humidity and elevated temperatures further confirmed the robustness of the AgNWs/SLGO films, underscoring their potential for use in flexible displays, solar cells, and touch sensors. SLGO plays a critical role by acting as a protective layer and enhancing the uniformity of the AgNW network.
This case highlights the utility of single-layer graphene oxide in the development of high-performance transparent conductive electrodes, providing a scalable and effective solution for optoelectronic applications.
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