Ferrocene and Inconel assisted growth of dense carbon nanotube forests on copper foils

Atthipalli, Gowtam; Epur, Rigved; Kumta, Prashant N.; Gray, Jennifer L.

doi:10.1116/1.3591428

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…The use of nanostructured Co/Pt/Au catalyst has been reported to reduce the formation of carbon encapsulation around the catalytic particles. 28 In the use of mixed catalyst sources, it has been reported that depositing nickel catalyst layer on the predeposited iron catalyst layer promotes a higher CNT yield 29 due to a high 31,32 As ferrocene is an iron-containing organometallic compound, using ferrocene/ nickel-mixed catalyst source resembles the use of iron/nickelmixed catalyst, as discussed earlier. It can be predicted that the additional catalytic activity of nickel to the ferrocene catalyst source contributes significantly to the achievable CNT height and the crystallinity in a CVD process.…”

Section: ■ Introductionmentioning

confidence: 98%

“…30 Besides using bilayer nickel/iron catalyst, Atthipalli et al have reported use of hybridized catalyst combining the predeposited nickel layer and continuously injecting volatile ferrocene catalyst sources for dense, vertically aligned CNT growth. 31,32 As ferrocene is an iron-containing organometallic compound, using ferrocene/nickel-mixed catalyst source resembles the use of iron/nickel-mixed catalyst, as discussed earlier. It can be predicted that the additional catalytic activity of nickel to the ferrocene catalyst source contributes significantly to the achievable CNT height and the crystallinity in a CVD process.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Carbon Nanotubes Growth Using Nickel/Ferrocene-Hybridized Catalyst

et al. 2017

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Tall, crystalline carbon nanotubes (CNTs) are desired to successfully integrate them in various applications. As the crystallinity of CNTs improves with increasing growth temperatures, higher growth temperatures are required to obtain crystalline CNTs. However, in a typical chemical vapor deposition (CVD) process, CNT growth rate reduces when the growth temperature exceeds a specific level due to the degradation of the catalyst particles. In this study, we have demonstrated the improved catalytic activity of nickel/ferrocene-hybridized catalyst as compared to sole ferrocene catalyst. To demonstrate this, CNTs are grown on bare silicon (Si) as well as nickel (Ni) catalyst-deposited substrates using volatile catalyst source (ferrocene/xylene) CVD at the growth temperatures ranging from 790 to 880 °C. It was found that CNTs grown on bare Si substrate experience a reduction in height at growth temperature above 860 °C, whereas the CNTs grown on 10 nm Ni catalyst-deposited substrates experience continuous increase in height as the temperature increases from 790 to 880 °C. The enhancement in the height of CNTs by the addition of Ni catalyst is also demonstrated on 5, 20, and 30 nm Ni layers. The examination of CNTs using electron microscopy and Raman spectra shows that the additional Ni catalyst source improves the CNT growth rates and crystallinity, yielding taller CNTs with a high degree of structural crystallinity.

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Section: ■ Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Enhanced Carbon Nanotubes Growth Using Nickel/Ferrocene-Hybridized Catalyst

et al. 2017

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“…There have been many papers reporting that Inconel film and Inconel substrate can be used as catalysts for the MWCNT growth [28,29]. To understand the effect of Inconel film as buffer layer on the growth of MWCNTs, a bare surface (Inconel film layer deposited on Cu foil) was further investigated.…”

Section: Resultsmentioning

confidence: 99%

“…Although some amorphous big particles also can be observed, it is mostly dense growth of MWCNTs. From the literature [28], the Inconel film thickness in the range of 10-12 nm was represented in the best alignment and density of CNT forests. In that case, the iron catalyst was supplied by mixing ferrocene with the xylene.…”

Section: Characterizationmentioning

confidence: 99%

Buffer Film Assisted Growth of Dense MWCNTs on Copper Foils for Flexible Electrochemical Applications

Pakdee

Duangsawat

2017

Journal of Nanomaterials

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The novel Inconel buffer films were prepared on copper foils using unbalance direct current (DC) magnetron sputtering. These films were employed as buffer layers for supporting the dense growth of multiwalled carbon nanotubes (MWCNTs). Thermal chemical vapor deposition (CVD) with metal alloys such as stainless steel (SS) type 304 films was considered to synthesize MWCNTs. To understand the effectiveness of these buffer films, the MWCNTs grown on buffer-free layer were carried out as a comparison. The main problem such as the diffusion of catalysts into the oxide layer of metal substrate during the CVD process was solved together with a creation of good electrical contact between substrate and nanotubes. The morphologies, crystallinities, and electrochemical behaviors of MWCNTs grown on Inconel buffer films with 304 SS catalysts revealed the better results for applying in flexible electrochemical applications.

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“…We note that Inconel is reported elsewhere as a suitable catalyst for the growth of carbon nanotubes. 43,44 The thickness of the coating was assessed by using a focussed ion beam (FIB) technique to etch a small pit in a coated region so that the cross section could be analysed. The result is presented in Fig.…”

Section: A C C E P T E Dmentioning

confidence: 99%

Low-temperature synthesis of a graphene-based, corrosion-inhibiting coating on an industrial grade alloy

et al. 2019

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 Prepare a 7 nm thick graphene based coating on an Inconel 625 substrate  A low temperature, molecular polymerisation recipe prevents substrate degradation  Coating reduces corrosion current by two orders of magnitude in acidic conditionsThe use of graphene materials as protective coatings for metallic substrates has received much attention because of graphene's ability to seal a metal and prevent the diffusion of most corrosive species to the metal surface. The application of graphene-based coating technology to industrially relevant samples, however, is hindered by the high growth temperatures required to prepare functional and efficient protective graphene layers. The growth temperatures typical for popular catalysts and precursors are incompatible with most relevant alloys. Here, we present a lowtemperature synthesis route to a graphene-based coating, using a complex metallic alloy, Inconel 625, as an example substrate. We demonstrate that the coating reduces the sample corrosion current by two orders of magnitude and also shifts the open circuit potential from -308 mV to +129 mV. We present an extensive characterisation of the coating and the coating synthesis procedure. The procedure relies on a surface-activated, thermally-induced polymerisation reaction and the method should be transferable to other metallic alloys.

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Ferrocene and Inconel assisted growth of dense carbon nanotube forests on copper foils

Abstract: Articles you may be interested inEffect of oxygen plasma on field emission characteristics of single-wall carbon nanotubes grown by plasma enhanced chemical vapour deposition system

Cited by 10 publications

References 27 publications

Enhanced Carbon Nanotubes Growth Using Nickel/Ferrocene-Hybridized Catalyst

Enhanced Carbon Nanotubes Growth Using Nickel/Ferrocene-Hybridized Catalyst

Buffer Film Assisted Growth of Dense MWCNTs on Copper Foils for Flexible Electrochemical Applications

Low-temperature synthesis of a graphene-based, corrosion-inhibiting coating on an industrial grade alloy

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