Confocal Microscopy for Process Monitoring and Wide-Area Height Determination of Vertically-Aligned Carbon  Nanotube Forests

Piwko, Markus; Althues, Holger; Schumm, Benjamin; Kaskel, Stefan

doi:10.3390/coatings5030477

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…The optimal Al 2 O 3 layer thickness was identified to be approx. 54 nm in previous experiments [10].…”

Section: Hsi Of Al2o3 Coated Stainless-steel Foilsmentioning

confidence: 51%

“…The optimal Al2O3 layer thickness was identified to be approx. 54 nm in previous experiments [10]. Multivariate data analysis was used to build prediction models for the calculation of Al2O3 layer thickness based on the hyperspectral measurements.…”

Section: Hsi Of Al2o3 Coated Stainless-steel Foilsmentioning

confidence: 99%

“…The present work introduces a framework for the layer thickness control of slot-die coated aluminum oxide (Al 2 O 3 ) layers on a stainless steel foil using HSI in the visible and near infrared wavelength range (VNIR, 400 nm-1000 nm). The coated steel foils can be used as substrate for the continuous production of vertically aligned carbon nanotubes (VA-CNTs) for battery applications [10].…”

Section: Introductionmentioning

confidence: 99%

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Quality Control of Slot-Die Coated Aluminum Oxide Layers for Battery Applications Using Hyperspectral Imaging

et al. 2016

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Hyperspectral inspection using imaging systems is becoming more and more important for quality control tasks in several industries, replacing well trained operators or established machine vision systems based on RGB-systems. Hyperspectral imaging (HSI) on thin coated substrates is challenging due to the high reflectivity of the substrates. Nevertheless, the thin films contribute to the spectral data and can be evaluated. Therefore, the performance of inspection systems can be increased significantly. However, the large amount of data generated by HSI has to be processed and evaluated for quality information about the product. In this paper, thin aluminum oxide (Al 2 O 3) layers on stainless steel foil are investigated by HSI. These substrates can be used for the growth of vertically aligned carbon nanotubes (VA-SWCNT) for battery electrodes. HSI and spectral ellipsometry in combination with Partial Least Squares regression (PLS) was used to estimate the thickness of the Al 2 O 3 layers and to calculate quality parameters for a possible monitoring process. The PLS model shows a R 2 CV of 0.979 and a RMSECV of 3.6.

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“…The optimal Al 2 O 3 layer thickness was identified to be approx. 54 nm in previous experiments [10].…”

Section: Hsi Of Al2o3 Coated Stainless-steel Foilsmentioning

confidence: 51%

Section: Hsi Of Al2o3 Coated Stainless-steel Foilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quality Control of Slot-Die Coated Aluminum Oxide Layers for Battery Applications Using Hyperspectral Imaging

et al. 2016

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“…The as-synthesized composites were transferred for electrochemical testing from the nickel substrate onto a 15 µm-thick primer coated aluminum foil (MTI Corporation (Richmond, CA, USA), 99.3%, 3.68 mg cm −2 ) by the use of a hot press (LaboPress P 200 T manufactured by Vogt Maschinenbau GmbH, Germany). The hot press molding was performed at 80 • C for 10 min, and then cooled to room temperature [40,41].…”

Section: Preparation Of the Lto-/lmo-vacnt Compositementioning

confidence: 99%

Nanostructured Networks for Energy Storage: Vertically Aligned Carbon Nanotubes (VACNT) as Current Collectors for High-Power Li4Ti5O12(LTO)//LiMn2O4(LMO) Lithium-Ion Batteries

et al. 2017

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Abstract:As a concept for electrode architecture in high power lithium ion batteries, self-supported nanoarrays enable ultra-high power densities as a result of their open pore geometry, which results in short and direct Li + -ion and electron pathways. Vertically aligned carbon nanotubes (VACNT) on metallic current collectors with low interface resistance are used as current collectors for the chemical solution infiltration of electroactive oxides to produce vertically aligned carbon nanotubes decorated with in situ grown LiMn 2 O 4 (LMO) and Li 4 Ti 5 O 12 (LTO) nanoparticles. The production processes steps (catalyst coating, VACNT chemical vapor deposition (CVD), infiltration, and thermal transformation) are all scalable, continuous, and suitable for niche market production to achieve high oxide loadings up to 70 wt %. Due to their unique transport structure, as-prepared nanoarrays achieve remarkably high power densities up to 2.58 kW kg −1 , which is based on the total electrode mass at 80 C for LiMn 2 O 4 //Li 4 Ti 5 O 12 full cells. The tailoring of LTO and LMO nanoparticle size (~20-100 nm) and VACNT length (array height: 60-200 µm) gives insights into the rate-limiting steps at high current for these kinds of nanoarray electrodes at very high C-rates of up to 200 C. The results reveal the critical structural parameters for achieving high power densities in VACNT nanoarray full cells.

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Transfer printing techniques enabled by advanced carbon nanomaterials

Kim,

Kim

2024

Transfer Printing Technologies and Applications

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Confocal Microscopy for Process Monitoring and Wide-Area Height Determination of Vertically-Aligned Carbon Nanotube Forests

Cited by 7 publications

References 22 publications

Quality Control of Slot-Die Coated Aluminum Oxide Layers for Battery Applications Using Hyperspectral Imaging

Quality Control of Slot-Die Coated Aluminum Oxide Layers for Battery Applications Using Hyperspectral Imaging

Nanostructured Networks for Energy Storage: Vertically Aligned Carbon Nanotubes (VACNT) as Current Collectors for High-Power Li4Ti5O12(LTO)//LiMn2O4(LMO) Lithium-Ion Batteries

Transfer printing techniques enabled by advanced carbon nanomaterials

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