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Surface Engineering Enabled Capacitive Gas-Phase Water Molecule Sensors in Carbon Nanodots
Jin-Xu Qin1, Cheng-Long Shen1, Wu-You Zhang1
1Henan Key Laboratory of Diamond Optoelectronic Material and Devices, Key Laboratory of Integrated Circuit, Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou, 450052, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 26, 2025
Summary
This study presents a new surface engineering method for highly sensitive carbon nanodot (CD)-based gas-phase water molecule sensors. The developed sensors show excellent performance across a wide humidity range, enabling diverse applications.
Area of Science:
- Materials Science
- Sensor Technology
- Nanotechnology
Background:
- Gas-phase water molecule sensors are critical for safety, environmental monitoring, and industrial processes.
- Developing highly sensitive water sensors remains a significant scientific challenge.
Purpose of the Study:
- To explore the effect of molecular adsorption on capacitive response in sensors.
- To demonstrate a surface engineering strategy for sensitive carbon nanodot (CD)-based water sensors.
Main Methods:
- Utilized hydrophilic precursors to prepare hydrophilic CDs for capacitive sensor active media.
- Employed surface engineering to regulate the molecular affinity of CDs.
- Investigated the influence of surface adsorption on capacitive response to water molecules.
Main Results:
- Achieved a broad detection range from 11% to 98% relative humidity (RH).
- Demonstrated remarkable sensitivity (3.3 × 105 pF/RH) and response (1.8 × 108% at 98% RH).
- Validated the influence of molecular affinity on capacitive response.
Conclusions:
- The surface-engineered CDs offer a promising platform for highly sensitive molecular sensors.
- These sensors have potential applications in respiratory monitoring, information exchange, and contactless recognition.
- The study opens new avenues for designing advanced molecular sensing technologies.
