Growth condition mediated catalyst effects on the density and length of horizontally aligned single-walled carbon nanotube arrays

An, Jianing; Zhan, Zhaoyao; Krishna, Sabbi Vamshi; Zheng, Lianxi

doi:10.1016/j.cej.2013.10.012

Cited by 21 publications

(12 citation statements)

References 33 publications

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“…To introduce strains and generate defects in isolated nanotubes instead of thin bundles, sparse SWNT arrays with wide separation are better candidates in this study. As discussed in our previous work55, the density of the SWNT arrays can be greatly affected by the growth conditions. In this regard, we set the growth recipe as: 0.01 M FeCl 3 ethanol solution serving as the catalyst precursor was reduced to Fe nanoparticles under 120 sccm of Ar and 30 sccm of H 2 gas mixture at 950 °C and ambient pressure.…”

Section: Methodsmentioning

confidence: 81%

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Zhan

Sun

et al. 2016

Sci Rep

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Leveraging the unique properties of single-walled carbon nanotube (SWNT) intramolecular junctions (IMJs) in innovative nanodevices and next-generation nanoelectronics requires controllable, repeatable, and large-scale preparation, together with rapid identification and comprehensive characterization of such structures. Here we demonstrate SWNT IMJs through directly growing ultralong SWNTs on trenched substrates. It is found that the trench configurations introduce axial strain in partially suspended nanotubes, and promote bending deformation in the vicinity of the trench edges. As a result, the lattice and electronic structure of the nanotubes can be locally modified, to form IMJs in the deformation regions. The trench patterns also enable pre-defining the formation locations of SWNT IMJs, facilitating the rapid identification. Elaborate Raman characterization has verified the formation of SWNT IMJs and identified their types. Rectifying behavior has been observed by electrical measurements on the as-prepared semiconducting-semiconducting (S-S) junction.

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Section: Methodsmentioning

confidence: 81%

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Zhan

Sun

et al. 2016

Sci Rep

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“…There are several strategies developed to produce graphene, including the mechanical exfoliation, 2, 5 chemical oxidization and reduction of graphite, 25,[28][29][30] and chemical vapor deposition (CVD). 5,6,31 Among them, CVD which has been used to grow high-quality nanostructures, including carbon nanotubes, [32][33][34][35][36] and semiconductor nanostructures, 37,38 is now considered to be the most promising method to obtain large-scale graphene that could be transferred to arbitrary substrate with the help of polymer mechanical support. 10,[39][40][41] The conventional methods of separating graphene from metal catalysts usually involve chemical etching to remove the metal.…”

Section: Introductionmentioning

confidence: 99%

Pore-free bubbling delamination of chemical vapor deposited graphene from copper foils

et al. 2015

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The electrolytic bubbling-assisted transfer of graphene from metal catalysts in chemical vapor deposition provides a high efficiency, low cost and environmental benign alternative to the traditional chemical etching method. Despite its high potential, the yield of the bubbling delamination is yet low, mainly due to the induced pores in the graphene after the transfer. It is found that the water and protons transport through the poly(methyl methacrylate) (PMMA) supporting layer play a critical role in the pore formation. Once the water and protons reach the PMMA-graphene interface before the delamination is finished, the protons permeate the graphene and form trapped hydrogen bubbles between the graphene and the metal. The built-up gas pressure inside the bubbles is high enough to crack the PMMA/graphene sheet thereby creating pores in the graphene. An optmized PMMA layer not only reduces trapped hydrogen bubble generation, but is also mechanically stronger preventing cracking. This contributes significantly to the pore-free electrolytic bubbling-assisted delamination of graphene.

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“…Chemiresistors offer several potential advantages such as low cost, low power consumption, rapid and label-free detection of chemicals/biomolecules, and highly accurate resistance measurements. [78][79][80]…”

Section: Cnt Chemiresistormentioning

confidence: 99%

“…One typical recipe to grow long SWCNTs is described here, which is similar to our previous works. 62,79,126,127 Gasflow-guided ethanol CVD was used to obtain horizontally-aligned ultralong SWCNTs.…”

Section: Iv)mentioning

confidence: 99%

Carbon nanotube based electronic detection of biomolecules and chemicals

Krishna¹

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First and foremost, I would like to thank my ex-supervisor, Prof. Zheng Lianxi, for giving me an opportunity to embark on this journey of PhD in the area of nanotechnology. These four years have undoubtedly been the toughest phase of my life as I kept encountering several hurdles both personally and academically. Nevertheless, every time I look up to Prof. Zheng, he has given me priceless suggestions, constant encouragement, and timely guidance, which have largely been the source of my strength during these strenuous phases. Prof. Zheng has been a true role model for me for his simple attitude towards work and life. I am deeply indebted to him, and without his guidance, I would not have been able to improve in various aspects of research and life. I also sincerely thank my current supervisor Prof. Wong Chee How, who has been instrumental in my thesis submission process following Prof. Zheng's departure from NTU. He has been kind and I am extremely grateful to him for lending a helping hand in my troubled times.

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Growth condition mediated catalyst effects on the density and length of horizontally aligned single-walled carbon nanotube arrays

Cited by 21 publications

References 33 publications

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Pore-free bubbling delamination of chemical vapor deposited graphene from copper foils

Carbon nanotube based electronic detection of biomolecules and chemicals

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