The Effect of Al Buffer Layer on the Catalytic Synthesis of Carbon Nanotube Forests

Pitkänen, Olli; Lorite, Gabriela S.; Shi, Gang; Rautio, Anne-Riikka; Uusimäki, A.; Vajtai, Róbert; Tóth, Géza; Kordás, Krisztián

doi:10.1007/s11244-015-0479-5

Cited by 9 publications

(12 citation statements)

References 28 publications

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“…In electrical applications of on-device CNT forests, it is essential to ensure a seamless interface between the nanotubes and the metallic current collector layer of the device. In our previous study, we confirmed that carbon nanotubes can be grown on a number of different metal foils and slabs when using aluminum buffer layer without significantly increase in the series resistance of the metal-CNT interface in supercapacitor applications 44 . In our current effort, we implement our well-tested growth technology to synthesize interdigitated micro patterns of aligned CNT forests directly on a silicon chip.…”

Section: Introductionsupporting

confidence: 56%

On-chip integrated vertically aligned carbon nanotube based super- and pseudocapacitors

Pitkänen

Järvinen

Cheng

et al. 2017

Sci Rep

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On-chip energy storage and management will have transformative impacts in developing advanced electronic platforms with built-in energy needs for operation of integrated circuits driving a microprocessor. Though success in growing stand-alone energy storage elements such as electrochemical capacitors (super and pseusocapacitors) on a variety of substrates is a promising step towards this direction. In this work, on-chip energy storage is demonstrated using architectures of highly aligned vertical carbon nanotubes (CNTs) acting as supercapacitors, capable of providing large device capacitances. The efficiency of these structures is further increased by incorporating electrochemically active nanoparticles such as MnOx to form pseudocapacitive architectures thus enhancing device capacitance areal specific capacitance of 37 mF/cm2. The demonstrated on-chip integration is up and down-scalable, compatible with standard CMOS processes, and offers lightweight energy storage what is vital for portable and autonomous device operation with numerous advantages as compared to electronics built from discrete components.

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Section: Introductionsupporting

confidence: 56%

On-chip integrated vertically aligned carbon nanotube based super- and pseudocapacitors

Pitkänen

Järvinen

Cheng

et al. 2017

Sci Rep

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“…As shown by the XPS spectra in Figure c, d, the 2p 1/2 (793.3 eV) and 2p 3/2 (777.8 eV) XPS peaks of the metallic Co phase emerge after annealing for the sa-Al substrate, while the Co phase for the nontreated sample is completely oxide. Moreover, the nanostructured Al with large surface area and high wettability enables trapping of catalyst atoms and uniform dispersion of catalyst particles, , and enhances hydrogen adsorption and spillover onto catalysts, , both of which contribute to the enhanced catalytic activity at lower CVD temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…As shown by the XPS spectra in Figure 3c, d nontreated sample is completely oxide. Moreover, the nanostructured Al with large surface area and high wettability enables trapping of catalyst atoms and uniform dispersion of catalyst particles, 36,37 and enhances hydrogen adsorption and spillover onto catalysts, 38,39 both of which contribute to the enhanced catalytic activity at lower CVD temperatures. The exemplary TEM image in Figure 3e shows that the average diameter of the catalyst nanoparticle is ca.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Breakdown of Native Oxide Enables Multifunctional, Free-Form Carbon Nanotube–Metal Hierarchical Architectures

Cui

Wardle

2019

ACS Appl. Mater. Interfaces

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Passive oxide layers on metal substrates impose remarkable interfacial resistance for electron and phonon transport. Here, a scalable surface activation process is presented for the breakdown of the passive oxide layer and the formation of nanowire/nanopyramid structured surfaces on metal substrates, which enables high-efficiency catalysis of high-crystallinity carbon nanotubes (CNTs) and the direct integration of the CNT–metal hierarchical architectures with flexible free-form configurations. The CNT–metal hierarchical architecture facilitates a dielectric free-energy-carrier transport pathway and blocks the reformation of passive oxide layer, and thus demonstrates a 5-fold decrease in interfacial electrical resistance with 66% increase in specific surface area compared with those without surface activation. Moreover, the CNT–metal hierarchical architectures demonstrate omnidirectional blackbody photoabsorption with the reflectance of 1 × 10–5 over the range from ultraviolet to terahertz region, which is 1 order of magnitude lower than that of any previously reported broadband absorber material. The synergistically incorporated CNT–metal hierarchical architectures offer record-high broadband optical absorption with excellent electrical and structural properties as well as industrial-scale producibility.

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“…Lately, the growth of VACNT have been reported on different conducting DBL materials, such as aluminium [4,23,25,46,51,56,[63][64][65][66][67][68][69][70][71][72][73], molybdenum aluminide [34,74], tantalum [62,75,76], tantalum nitride [77,78], titanium [79,80], titanium aluminide [47], titanium nitride [60,[81][82][83][84][85][86][87][88], metal silicide nitride [89][90][91], their stacking use, graphitic layer [92] and many others. Nowadays, researchers are using physical vapor deposition (PVD), atomic layer deposition (ALD) [86,93,94], or CVD techniques for the deposition of various conducting DBL.…”

Section: Dbl Towards Enhanced Growth Of Vacnt On Diverse Flat and 3-d...mentioning

confidence: 99%

“…Therefore, long VACNT are easily achievable on insulating DBLs, yet, the same needs to be developed for conducting ones. Research teams have deeply investigated the use of Al DBL, with different postdeposition treatments, for the growth of VACNT [46,51,[64][65][66][68][69][70][71][72].…”

Section: Via Physical Vapour Deposition (Pvd)mentioning

confidence: 99%

Conducting Interface for Efficient Growth of Vertically Aligned Carbon Nanotubes: Towards Nano-Engineered Carbon Composite

2022

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Vertically aligned carbon nanotubes (VACNT) are manufactured nanomaterials with excellent properties and great potential for numerous applications. Recently, research has intensified toward achieving VACNT synthesis on different planar and non-planar substrates of various natures, mainly dependent on the user-defined application. Indeed, VACNT growth has to be adjusted and optimized according to the substrate nature and shape to reach the requirements for the application envisaged. To date, different substrates have been decorated with VACNT, involving the use of diffusion barrier layers (DBLs) that are often insulating, such as SiO2 or Al2O3. These commonly used DBLs limit the conducting and other vital physico-chemical properties of the final nanomaterial composite. One interesting route to improve the contact resistance of VACNT on a substrate surface and the deficient composite properties is the development of semi-/conducting interlayers. The present review summarizes different methods and techniques for the deposition of suitable conducting interfaces and controlled growth of VACNT on diverse flat and 3-D fibrous substrates. Apart from exhibiting a catalytic efficiency, the DBL can generate a conducting and adhesive interface involving performance enhancements in VACNT composites. The abilities of different conducting interlayers are compared for VACNT growth and subsequent composite properties. A conducting interface is also emphasized for the synthesis of VACNT on carbonaceous substrates in order to produce cost-effective and high-performance nano-engineered carbon composites.

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The Effect of Al Buffer Layer on the Catalytic Synthesis of Carbon Nanotube Forests

Cited by 9 publications

References 28 publications

On-chip integrated vertically aligned carbon nanotube based super- and pseudocapacitors

On-chip integrated vertically aligned carbon nanotube based super- and pseudocapacitors

Breakdown of Native Oxide Enables Multifunctional, Free-Form Carbon Nanotube–Metal Hierarchical Architectures

Conducting Interface for Efficient Growth of Vertically Aligned Carbon Nanotubes: Towards Nano-Engineered Carbon Composite

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