Layer-by-layer self-assembled functional coatings of carbon nanotube-polyethylenimine for enhanced heat transfer of heat sinks

Lee, Jaemin; Kyeong, Daehyeon; Kim, Jihun; Choi, Wonjoon

doi:10.1016/j.ijheatmasstransfer.2021.122344

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…The sequential deposition of alternating layers, coupled with interactions between these layers and the substrate, contributes to a more ordered arrangement of MWCNTs on the substrate surface. This controlled layering and enhanced surface interaction led to the formation of thin films with uniform thickness, in contrast to SWCNTs which, being single-layered, may exhibit comparatively less homogeneity in the films produced using the same assembly method [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

Nasiri,

Tong,

Cho

et al. 2024

Materials

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In this study, we have improved the power factor of conductive polymer nanocomposites by combining layer-by-layer assembly with electrochemical deposition to produce flexible thermoelectric materials based on PEDOT/carbon nanotubes (CNTs)—films. To produce films based on CNTs and PEDOT, a dual approach has been employed: (i) the layer-by-layer method has been utilized for constructing the CNTs layer and (ii) electrochemical polymerization has been used in the synthesis of the conducting polymer. Moreover, the thermoelectric properties were optimized by controlling the experimental conditions including the number of deposition cycles and electropolymerizing time. The electrical characterization of the samples was carried out by measuring the Seebeck voltage produced under a small temperature difference and by measuring the electrical conductivity using the four-point probe method. The resulting values of the Seebeck coefficient S and σ were used to determine the power factor. The structural and morphological analyses of CNTs/PEDOT samples were carried out using scanning electron microscopy (SEM) and Raman spectroscopy. The best power factor achieved was 131.1 (μWm−1K−2), a competitive value comparable to some inorganic thermoelectric materials. Since the synthesis of the CNT/PEDOT layers is rather simple and the ingredients used are relatively inexpensive and environmentally friendly, the proposed nanocomposites are a very interesting approach as an application for recycling heat waste.

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Section: Resultsmentioning

confidence: 99%

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

Nasiri,

Tong,

Cho

et al. 2024

Materials

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“…The LbL method has been automated and is now used to develop new commercial products. 85,86 Industry explores future directions for applying LbL, such as functional coatings on complex surfaces, 87–90 membranes 81,91,92 and material design, 93,94 and for biomedical delivery applications. 95–97…”

Section: Methods For the Formation Of Layered Structuresmentioning

confidence: 99%

Layered nanomaterials for renewable energy generation and storage

Nikitina,

Lavrentev,

Yurova

et al. 2024

Mater. Adv.

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“…The charged MWCNTs were then dried in a vacuum oven for 12 h to evaporate the remaining solvent. [ 35 ] Finally, charged MWCNTSs with COOH groups were dispersed in DI water at a concentration of 0.1 mg mL −1 and ultrasonicated in a sonicator bath for 1.5 h. The pH level of the positively and negatively charged solutions (PEI and MWCNT solutions) is one of the most important factors for optimizing the LbL coating process, as it dominantly affects the zeta potentials of the colloids and the charge density of the polyelectrolyte in the solution. Therefore, the pH of the MWCNT‐COOH solution and PEI solution was adjusted using 0.1 m NaOH and 0.1 m HCl to optimize the multilayer thickness.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Cooling Performance of Three‐Dimensional Printed Heat Sink via Solution‐Processed Layer‐by‐Layer CNT Coatings

Song,

Lee,

Seo

et al. 2023

Adv Eng Mater

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3D printing technique offers lightweight, compact and flexible thermal components that can be integrated into bendable and curved form factors. However, their low thermal conductivity of the polymer‐based backbone structures degrades thermal performances, thereby demanding the rational solution to compensate heat transfer rates. Herein, we report a thermally functional coating of multi‐walled carbon nanotubes (MWCNT) and polyethyleneimine (PEI) through a layer‐by‐layer (LbL) deposition process for a 3D‐printed polymer heat sink (3DP‐HS). The 3DP‐HS is manufactured using the fused filament fabrication and can withstand bending and twisting while solution‐processed LbL self‐assembly directly deposits ultra‐thin MWCNT‐PEI bilayers through stacking materials dissolved in positively and negatively charged solutions using electrostatic attraction. Comparing with the flat polymer plate, the 3DP‐HS validates the heat dissipation function, confirmed via the improved heat transfer coefficient (HTC). Furthermore, the LbL MWCNT‐PEI bilayers highly increase the enhancement rate over 85% owing to extended nanoporous areas and air‐flow mixing on the rough surface. Precise analyses of thermal performances for 10 and 30 MWCNT‐PEI bilayers (∽120–180 nm in thickness) elucidate the proper LbL surfaces on HS, in accordance with heat generation levels. This work would lead to developing a facile yet effective functional coating process for various 3D‐printed thermal management components.This article is protected by copyright. All rights reserved.

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Layer-by-layer self-assembled functional coatings of carbon nanotube-polyethylenimine for enhanced heat transfer of heat sinks

Cited by 14 publications

References 33 publications

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

Synthesis of PEDOT/CNTs Thermoelectric Thin Films with a High Power Factor

Layered nanomaterials for renewable energy generation and storage

Enhanced Cooling Performance of Three‐Dimensional Printed Heat Sink via Solution‐Processed Layer‐by‐Layer CNT Coatings

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