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Rattling-Induced Ultralow Thermal Conductivity in Black Phosphorus Through Organic-Molecule Intercalation
Shuai Duan1, Xiujie Sun1, Yangfan Cui1
1Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 17, 2025
Summary
Researchers developed a novel rattling-scatter strategy using organic molecules like ethylenediamine (EDA) to reduce heat conductivity in layered materials. This method significantly boosts thermoelectric performance in materials like black phosphorus (BP).
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Layered materials offer excellent electrical conductivity for thermoelectrics.
- High intralayer lattice thermal conductivity hinders their application.
- Need for strategies to reduce thermal conductivity in layered materials.
Purpose of the Study:
- To propose and demonstrate a rattling-scatter strategy for reducing intralayer lattice thermal conductivity.
- To investigate the effect of organic molecule intercalation on thermoelectric properties of layered materials.
- To enhance the thermoelectric figure of merit (zT) in black phosphorus (BP).
Main Methods:
- Theoretical calculations to understand the mechanism of lattice anharmonicity and group velocity reduction.
- Experimental synthesis of ethylenediamine (EDA) intercalated black phosphorus (BP/EDA) composites.
- Measurement of thermal conductivity and electrical properties of BP/EDA composites.
Main Results:
- Organic molecule intercalation significantly enhances lattice anharmonicity and reduces group velocity.
- Achieved over a tenfold decrease in intralayer lattice thermal conductivity in BP/EDA.
- Experimental thermal conductivity of BP/EDA composites reduced to 0.13 Wm⁻¹K⁻¹ at 300 K.
- Conduction band convergence and enhanced electrical performance observed in BP/EDA.
- Predicted zT value of 0.53 at 300 K, a 19-fold increase over pristine BP.
Conclusions:
- Organic molecule intercalation effectively induces rattling motion to suppress lattice thermal conductivity.
- The rattling-scatter strategy is a promising approach for improving thermoelectric performance in layered materials.
- This study provides valuable insights for designing advanced thermoelectric materials.
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