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Title: Chemically linked metal-matrix nanocomposites of boron nitride nanosheets and silver as thermal interface materials

Abstract

Herein, novel hybrid nanocomposite thermal interface materials (TIMs) relying on the chemical linkage of silver, boron nitride nanosheets (BNNSs), and organic ligands are reported. These TIMs were prepared using a co-electrodeposition/chemisorption approach where the electrolytic reduction of silver ions into silver nano-/micro-crystals was coupled with the conjugation of ligand-coated nanosheets onto silver crystals. Furthermore, the influence of bond strength of silver/nanosheet links on the thermal, mechanical, and structural properties is investigated using a combination of techniques; including laser flash analysis, phase-sensitive transient thermoreflectance, nanoindentation, and electron microscopy. Internal nanostructure was found to be strongly dependent on the linker chemistry. While the chemical grafting of 4-cyano-benzoyl chloride (CBC) and 2-mercapto-5-benzimidazole carboxylic acid (MBCA) on BNNSs led to the uniform distribution of functionalized-nanosheets in the silver crystal matrix, the physical binding of 4-bromo-benzoyl chloride (BBC) linkers on nanosheets caused the aggregation and phase separation. The thermal conductivity was 236-258 W/m-K and 306-321 W/m-K for physically and chemically conjugated TIMs, respectively, while their hardness varied from 495 to 400 MPa and from 240 to 360 MPa, respectively. The corresponding ratio of thermal conductivity to hardness, which is a critical parameter controlling the performance of TIMs, was ultrahigh for the chemically conjugated TIMs: 1.3x10-6more » m2/K-s for MBCA-BNNS and 8.5x10-7 m2/K-s for CBC-BNNS. We anticipate that these materials can satisfy some of the emerging thermal management needs arising from the improved performance and efficiency, miniaturization, and/or high throughput of electronic devices, energy storage devices, energy conversion systems, light-emitting diodes, and telecommunication components.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [2];  [1];  [1];  [2]; ORCiD logo [1]
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  1. Texas A & M Univ., College Station, TX (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
U.S. Department of Defense (DOD), Defense Advanced Research Projects Agency (DARPA)
OSTI Identifier:
1422365
Report Number(s):
NREL/JA-5400-70771
Journal ID: ISSN 0957-4484
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Nanotechnology
Additional Journal Information:
Journal Volume: 29; Journal Issue: 10; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; thermal management; 2-D nanomaterials; nanostructured materials; nanocomposites

Citation Formats

Nagabandi, N., Yegin, C., Feng, X., King, C., Oh, J. K., Scholar, E. A., Narumanchi, S., and Akbulut, M. Chemically linked metal-matrix nanocomposites of boron nitride nanosheets and silver as thermal interface materials. United States: N. p., 2018. Web. doi:10.1088/1361-6528/aaa668.
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Nagabandi, N., Yegin, C., Feng, X., King, C., Oh, J. K., Scholar, E. A., Narumanchi, S., & Akbulut, M. Chemically linked metal-matrix nanocomposites of boron nitride nanosheets and silver as thermal interface materials. United States. https://doi.org/10.1088/1361-6528/aaa668
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Nagabandi, N., Yegin, C., Feng, X., King, C., Oh, J. K., Scholar, E. A., Narumanchi, S., and Akbulut, M. Wed . "Chemically linked metal-matrix nanocomposites of boron nitride nanosheets and silver as thermal interface materials". United States. https://doi.org/10.1088/1361-6528/aaa668. https://www.osti.gov/servlets/purl/1422365.
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@article{osti_1422365,
title = {Chemically linked metal-matrix nanocomposites of boron nitride nanosheets and silver as thermal interface materials},
author = {Nagabandi, N. and Yegin, C. and Feng, X. and King, C. and Oh, J. K. and Scholar, E. A. and Narumanchi, S. and Akbulut, M.},
abstractNote = {Herein, novel hybrid nanocomposite thermal interface materials (TIMs) relying on the chemical linkage of silver, boron nitride nanosheets (BNNSs), and organic ligands are reported. These TIMs were prepared using a co-electrodeposition/chemisorption approach where the electrolytic reduction of silver ions into silver nano-/micro-crystals was coupled with the conjugation of ligand-coated nanosheets onto silver crystals. Furthermore, the influence of bond strength of silver/nanosheet links on the thermal, mechanical, and structural properties is investigated using a combination of techniques; including laser flash analysis, phase-sensitive transient thermoreflectance, nanoindentation, and electron microscopy. Internal nanostructure was found to be strongly dependent on the linker chemistry. While the chemical grafting of 4-cyano-benzoyl chloride (CBC) and 2-mercapto-5-benzimidazole carboxylic acid (MBCA) on BNNSs led to the uniform distribution of functionalized-nanosheets in the silver crystal matrix, the physical binding of 4-bromo-benzoyl chloride (BBC) linkers on nanosheets caused the aggregation and phase separation. The thermal conductivity was 236-258 W/m-K and 306-321 W/m-K for physically and chemically conjugated TIMs, respectively, while their hardness varied from 495 to 400 MPa and from 240 to 360 MPa, respectively. The corresponding ratio of thermal conductivity to hardness, which is a critical parameter controlling the performance of TIMs, was ultrahigh for the chemically conjugated TIMs: 1.3x10-6 m2/K-s for MBCA-BNNS and 8.5x10-7 m2/K-s for CBC-BNNS. We anticipate that these materials can satisfy some of the emerging thermal management needs arising from the improved performance and efficiency, miniaturization, and/or high throughput of electronic devices, energy storage devices, energy conversion systems, light-emitting diodes, and telecommunication components.},
doi = {10.1088/1361-6528/aaa668},
journal = {Nanotechnology},
number = 10,
volume = 29,
place = {United States},
year = {Wed Jan 31 00:00:00 EST 2018},
month = {Wed Jan 31 00:00:00 EST 2018}
}
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https://doi.org/10.1088/1361-6528/aaa668
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Figures / Tables:

Table 1 Table 1: The comparison of electrical conductivity of various types of composite TIMs at 25 °C.
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