Properties of Undoped Few-Layer Graphene-Based Transparent Heaters

Zhang, Yong; Liu, Hao; Tan, Longwang; Zhang, Yan; Jeppson, Kjell; Wei, Bin; Liu, Johan

doi:10.3390/ma13010104

Cited by 19 publications

(8 citation statements)

References 32 publications

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“…(e) Maximum temperatures as a function of the applied DC voltage, revealing a linear response at voltages above 1 V. (f) Comparative plot of the power density required to attain T max for several nanocarbon-based heaters. In addition to the FS-NGF/Kapton (FS-NGF-2022) developed in this work, examples of active materials described in the literature include doped single-layer graphene (doped SLG-2011), few-layer graphene (5 SLG-2020), laser-reduced graphene oxide (LrGO-2018), CNT-polymer composite (MWCNT-PEDOT-PSS-2021), and single-walled CNT (SWCNT-2011) . (g) Prolonged durability test (12 days) in air, with an applied bias of 5.71 V; inset shows an IR image taken at the end of the test, where T max = 215 °C.…”

Section: Resultsmentioning

confidence: 99%

“…A finite element model (FEM) was constructed to analyze the heat propagation as well as the electrical and thermal properties of the NGFs . To do so, we used the electrical and heat transfer modules integrated in the COMSOL Multiphysics software package. , Simulations of graphene-based materials and their properties using COMSOL are reported in previous studies. − The computational work was performed on a desktop workstation (8 Cores, 3.7 GHz, 64 GB RAM, Supermicro SYS-5039A). To determine the heating device size and model its components, we relied on the experimental size parameters and physical properties listed in public databases. − ,, First, we designed a 4.5 cm 2 graphite film (the same area as that of the device in Figure ) with uniform thickness (100 nm) and properties, which served as a control sample for the simulations.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Flexible, Air-Stable, High-Performance Heaters Based on Nanoscale-Thick Graphite Films

Deokar

Reguig

Büttner

et al. 2022

ACS Appl. Mater. Interfaces

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Graphite sheets are known to exhibit remarkable performance in applications such as heating panels and critical elements of thermal management systems. Industrial-scale production of graphite films relies on high-temperature treatment of polymers or calendering of graphite flakes; however, these methods are limited to obtaining micrometer-scale thicknesses. Herein, we report the fabrication of a flexible and power-efficient cm2-scaled heater based on a polycrystalline nanoscale-thick graphite film (NGF, ∼100 nm thick) grown by chemical vapor deposition. The stability of these NGF heaters (operational in air over the range 30–300 °C) is demonstrated by a 12-day continuous heating test, at 215 °C. The NGF exhibits a fast switching response and attains a steady peak temperature of 300 °C at a driving bias of 7.8 V (power density of 1.1 W/cm2). This excellent heating performance is attributed to the structural characteristics of the NGF, which contains well-distributed wrinkles and micrometer-wide few-layer graphene domains (characterized using conductive imaging and finite element methods, respectively). The efficiency and flexibility of the NGF device are exemplified by externally heating a 2000 μm-thick Pyrex glass vial and bringing 5 mL of water to a temperature of 96 °C (at 2.4 W/cm2). Overall, the NGF could become an excellent active material for ultrathin, flexible, and sustainable heating panels that operate at low power.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Flexible, Air-Stable, High-Performance Heaters Based on Nanoscale-Thick Graphite Films

Deokar

Reguig

Büttner

et al. 2022

ACS Appl. Mater. Interfaces

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show abstract

“…Sun, et al., [ 38 ] L. R. Shobin, et al., [ 39 ] S. Kang, et al., [ 40 ] D.‐S. Kwon, et al., [ 41 ] B. M. Lee, et al., [ 42 ] Y. Zhang, et al., [ 43 ] J. E. Kim, et al., [ 44 ] ). d) Temperature response of the as‐made SWCNT film (with a loading of 50 mg m −2 and an average thickness of 38 nm) at various applied voltages.…”

Section: Resultsmentioning

confidence: 99%

Fast Peel‐Off Ultrathin, Transparent, and Free‐Standing Films Assembled from Low‐Dimensional Materials Using MXene Sacrificial Layers and Produced Bubbles

et al. 2021

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Ultrathin, transparent, and free‐standing films assembled from low‐dimensional nanomaterials (LDMs) are promising for various applications, including transparent heaters and membranes. However, the intact separation of the assembled films, especially those with controlled ultrathin thickness from deposited substrates, is a tremendous challenge, particularly for fast peeling off via self‐detaching. Herein, we propose a versatile method to rapidly peel off ultrathin assembled LDM films, including three types of carbon nanotubes, vermiculite, Ag nanowires, and carbon nanotube@graphene, by dissolving the MXene interlayer from the layer‐by‐layer filtered MXene/LDM Janus films using diluted H2O2. The MXene sacrificial interlayers play dual roles, including physical isolation of LDM films from filter membranes and the production of bubbles that buoy ultrathin LDM films, making them free‐standing. The integrality and self‐detaching rate of the LDM films are determined by the loading and reactivity of the MXene interlayers. The intact LDM films can self‐detach in 80 s by dissolving the optimized MXene interlayer and producing bubbles. The as‐made free‐standing ultrathin LDM films can be transferred to arbitrary substrates and exhibit outstanding performance as transparent heaters. This scalable method provides an efficient and versatile method to produce ultrathin, transparent, and free‐standing LDM films and finds new applications for the growing MXene family.

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“…Other studies, based on flexible thin-film heaters, are focused on various applications such as automotive [3], sensors and displays [4], aircrafts [5], etc., show the necessity of thin-film Eng 2020, 1…”

Section: Introductionmentioning

confidence: 99%

An Analysis, Numerical Modeling and Experimental Verification of Low-Temperature Thermofoil Heaters

Dimitrov

2020

Eng

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In this paper, an analysis of the geometry, numerical modeling, and experimental verification of thermofoil heaters for low-temperature applications is presented. The research suggests a calculation procedure of the thermofoil traces’ geometry, comprising the necessary electrical and thermal parameters in order for the characteristics of the heater to be fully defined according to the stipulated conditions required. The derived heaters’ geometry analysis procedure is depicted with two case studies, giving the sequence of the necessary calculations and their applications as part of a design task. Its continuation, the design approach, is developed with numerical modeling, based on Finite Element Methods (FEM) used for multiphysics simulations, including the thermal and electrical heaters parameters. The realized 3D models are used to depict the uniformity of the thermal field in the system heatsink-thermofoil heater. The results from analysis, modeling, and simulations are tested experimentally. The suggested geometry analysis and modeling approach are experimentally verified. The final results demonstrate satisfactory precision with a simulation–experiment mismatch in a range of 5–7%. As a vital product of experimental research, the maximum power density for the studied thermofoil heaters is derived for a range of temperatures and material characteristics.

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Properties of Undoped Few-Layer Graphene-Based Transparent Heaters

Cited by 19 publications

References 32 publications

Flexible, Air-Stable, High-Performance Heaters Based on Nanoscale-Thick Graphite Films

Flexible, Air-Stable, High-Performance Heaters Based on Nanoscale-Thick Graphite Films

Fast Peel‐Off Ultrathin, Transparent, and Free‐Standing Films Assembled from Low‐Dimensional Materials Using MXene Sacrificial Layers and Produced Bubbles

An Analysis, Numerical Modeling and Experimental Verification of Low-Temperature Thermofoil Heaters

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