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Performance Optimization of Liquid-Solid Nanogenerators With Fluorinated Alkyl Self-Assembled Monolayers.
Qiqi Ming1,2, Rongbing Han2,3, Yan Xia1,2
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, Jiangsu, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 9, 2026
Summary
This study introduces a novel tubular liquid-solid triboelectric nanogenerator (LS-TENG) achieving high charge density. Grounding water and fluorinated silica enhance energy harvesting for self-powered systems.
Area of Science:
- Materials Science
- Energy Harvesting
- Nanotechnology
Background:
- Liquid-solid triboelectric nanogenerators (LS-TENGs) are promising for renewable energy.
- Current LS-TENGs suffer from low charge density.
- Contact electrification and electrostatic induction are key mechanisms.
Purpose of the Study:
- To develop a tubular LS-TENG with enhanced charge density.
- To investigate the effect of grounding water and surface modification on LS-TENG performance.
- To demonstrate the potential for practical applications in low-frequency energy harvesting.
Main Methods:
- Fabrication of a tubular LS-TENG using a self-assembled fluoroalkyl layer.
- Integration of grounding water to enhance charge transfer.
- Fluorinated modification of silica (SiO2) surfaces to boost contact electrification.
- Characterization of electrical output performance by varying motion parameters and liquid properties.
Main Results:
- The tubular LS-TENG achieved a high transferred charge of 1.96 µC (2.16 mC m⁻²).
- Grounding water significantly enhanced charge density, likely by shielding dielectric charges.
- Electrical output was tunable via motion frequency, swing angle, and liquid properties.
- Multiple devices were connected in parallel to power a hygrothermometer.
Conclusions:
- The developed tubular LS-TENG demonstrates significantly improved charge density compared to previous designs.
- Grounding water and surface fluorination are effective strategies for enhancing LS-TENG performance.
- The device shows great potential for low-frequency mechanical energy harvesting and self-powered systems.
