Synthesis of carbon nanocoil forests on BaSrTiO3 substrates with the aid of a Sn catalyst

Sun, Jingyu; Koós, Antal A.; Dillon, Frank; Jurkschat, Kerstin; Castell, Martin R.; Grobert, Nicole

doi:10.1016/j.carbon.2013.03.027

Cited by 13 publications

(7 citation statements)

References 30 publications

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“…4a. It is found that the height of CNC layer continuously increased with growth time, and the maximum thickness of the CNC layer reaches 306 μm after the reaction for 6 h. This is the highest value compared with those reported recently [34][35][36][40][41][42]. It is noted that both curves of the yield and thickness versus time are well matched, suggesting that the carbon deposits are almost CNCs.…”

Section: Yield Of High-purity Cncssupporting

confidence: 56%

“… Catalysts Preparation method Purity a Economy b Thickness of carbon layer (μm) Yield Refs. 1 Ag/K Thermal evaporation Good Fair Several microns – [ 35 ] 2 Au/K Thermal evaporation Good Fair Several microns – [ 34 ] 3 Cu ALD Excellent Fair Few – [ 28 ] 4 BaSrTiO 3 /Sn Mechanical mixing Excellent Fair Few – [ 36 ] 5 Na/K Solution method Good Good – 1178% [ 37 ] 6 Fe Sol–Gel method Excellent Fair Few 8078% [ 23 ] 7 Fe/In/Sn …”

Section: Resultsmentioning

confidence: 99%

“…In this method, selection of appropriate catalysts is crucial for synthesis of CNCs. Therefore, diversified types of catalysts, including Fe [23,24], Co [25], Ni [26,27], Cu [28], and multi-component alloys catalysts such as Fe/Sn [29][30][31], Fe/Sn/In [32,33], K/Au [34], K/Ag [35], BaSrTiO 3 /Sn [36], Na/K [37], Ni/P [38], and TiC [39] have been investigated for growth of CNCs. Although some improvements were made in raising the purity and yield of CNCs using different systems of catalysts, the low CNC purity is still a challenging issue.…”

Section: Introductionmentioning

confidence: 99%

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Growth of Carbon Nanocoils by Porous α-Fe2O3/SnO2 Catalyst and Its Buckypaper for High Efficient Adsorption

et al. 2020

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HIGHLIGHTS• High-purity (~ 99%) carbon nanocoils (CNCs) without the amorphous carbon layer were synthesized by using porous α-Fe 2 O 3 /SnO 2 catalyst.• The highest yield of the CNCs can reach ~ 9098% after a 6 h growth, which is much higher than those mentioned in previous reports.• A CNC Buckypaper was successfully prepared and utilized as an efficient adsorbent for the removal of methylene blue dye with the adsorption efficiency of 90.9%.ABSTRACT High-purity (99%) carbon nanocoils (CNCs) have been synthesized by using porous α-Fe 2 O 3 /SnO 2 catalyst. The yield of CNCs reaches 9,098% after a 6 h growth. This value is much higher than the previously reported data, indicating that this method is promising to synthesize high-purity CNCs on a large scale. It is considered that an appropriate proportion of Fe and Sn, proper particle size distribution, and a loose-porous aggregate structure of the catalyst are the key points to the high-purity growth of CNCs. Benefiting from the high-purity preparation, a CNC Buckypaper was successfully prepared and the electrical, mechanical, and electrochemical properties were investigated comprehensively.Furthermore, as one of the practical applications, the CNC Buckypaper was successfully utilized as an efficient adsorbent for the removal of methylene blue dye from wastewater with an adsorption efficiency of 90.9%. This study provides a facile and economical route for preparing high-purity CNCs, which is suitable for large-quantity production. Furthermore, the fabrication of macroscopic CNC Buckypaper provides promising alternative of adsorbent or other practical applications.

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Section: Yield Of High-purity Cncssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth of Carbon Nanocoils by Porous α-Fe2O3/SnO2 Catalyst and Its Buckypaper for High Efficient Adsorption

et al. 2020

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“…Therefore, many studies related to catalyst for growth of CNCs have been conducted to develop highly efficient catalysts for CNC growth based on transition-metal based catalysts, including the use of Co, Fe, and Ni [1,2], and multicomponent-catalysts such as Fe/Sn, Fe/In/Sn alloys [8,[13][14][15][16], and K/Ag [17]. Aside from these efforts for the development of catalysts, the interaction between the substrate and catalyst reportedly affects CNC growth [18][19][20]. The additional Sn buffer layer strongly supports the formation of highly efficient catalytic particles at the very early stage of CNC growth, which results in the high yield synthesis of CNCs.…”

Section: Introductionmentioning

confidence: 99%

Reduction of carbon byproducts for high-purity carbon nanocoil growth by suppressing catalyst collision

Gohara

Takei

Arie

et al. 2015

Carbon

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Carbon nanocoils (CNC) are promising nanocarbon materials for application as functional composites such as electromagnetic wave absorbers. However, the suppression of carbon byproducts during CNC growth is necessary to obtain high purity CNCs with high yield. Here, we demonstrate a simple but efficient method for the reduction of carbon byproducts using a patterned thin film catalyst. Results show that the collision of tip catalysts of growing CNCs to the substrate or other CNCs inhibits the smooth growth of CNCs because of the deactivation of the catalyst. The collision also stimulates the formation of a carbon byproduct layer underneath the CNC layer. The well-controlled thin film catalyst with checkerboard pattern brings us four-times-higher efficiency of the catalyst and suppresses the carbon byproduct layer to ~1/3.

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“…Sun et al [36] reported synthesizing single helical CNCs with 200-900 nm of external coil diameter using Sn on BaSrTiO3 substrate as catalyst. Sn was introduced in the pits or grain boundary triple junctions of polycrystalline BaSrTiO3 substrate.…”

Section: Sn Catalyst Supported By Basrtio3 Substratementioning

confidence: 99%

Growth and Properties of Carbon Microcoils and Nanocoils

2014

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Abstract:Various types of coiled carbon filaments have been synthesized using chemical vapor deposition and other methods. These carbon filaments exhibit unique electrical and mechanical properties due to their versatile shapes and structures. To form coiled shapes, different types of catalyst compositions and reactive gases have been explored. Generally, coiled carbon filaments are classified by coil diameter and shape (e.g., microcoil and nanocoil). In this review, coiled carbon filaments are classified into three growth mechanism categories: (1) bidirectional double helical growth; (2) bidirectional twisted growth; and (3) tip single helical or twisted growth. Next, their synthesis methods and hypothetical growth mechanisms are discussed. Then, their electrical and mechanical properties are listed. Finally, potential applications and uses of coiled carbon filament are mentioned.

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Synthesis of carbon nanocoil forests on BaSrTiO3 substrates with the aid of a Sn catalyst

Cited by 13 publications

References 30 publications

Growth of Carbon Nanocoils by Porous α-Fe2O3/SnO2 Catalyst and Its Buckypaper for High Efficient Adsorption

Growth of Carbon Nanocoils by Porous α-Fe2O3/SnO2 Catalyst and Its Buckypaper for High Efficient Adsorption

Reduction of carbon byproducts for high-purity carbon nanocoil growth by suppressing catalyst collision

Growth and Properties of Carbon Microcoils and Nanocoils

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