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Carbon dots decorated graphitic carbon nitride as a practical and flexible metal‑free nanosensor for breath humidity monitoring KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/435095
Development of carbon-based biocompatible and flexible nanosensors is essential in different practical applications. Humidity sensor is crucial in different fields among them. Herein, a unique metal-free nanosensor comprised of 2D-graphitic carbon nitride (CN) decorated with 0D-carbon dots (C-dots) was fabricated to monitor humidity in human breath. Simple polymerization and carbonization techniques were used to synthesize nitrogen enriched heterostructure (CN@C-dots). The synthesized heterostructure showed excellent physicochemical properties including high surface area, hydrophilic functionalities and more active sites that were responsible for enhanced humidity sensing. The fabricated nanosensor indicated excellent resistivity against humidity due to diffused proton hoping through inhibition of ion transfer from multiple water layers. The interaction mechanism was explained through simple hydrogen bonding and defective site chemisorbed oxygen participation in physisorbed humidity molecules.
Abstract
Graphical abstract
1 Introduction
2 Materials and methods
2.1 Materials
2.2 Synthesis of metal-free CN nanosheets
2.3 In-situ preparation of CN@C-dots
2.4 Fabrication of flexible nanosensor and humidity measurement
2.5 Characterization techniques
3 Results and discussion
3.1 Synthesis strategy
3.2 Characterizations of CN and CN@C-dots
3.3 Humidity analysis
3.3.1 Relative humidity sensing
3.3.2 Breath rate analysis
3.3.2.1 Normal breath
3.3.2.2 Deep breath
3.3.2.3 Respiration rates
3.3.2.4 Nasal and oral breaths
3.3.3 Humidity interaction mechanism
4 Conclusions
Acknowledgements
References
