Decrease in reflectance of vertically-aligned carbon nanotubes after oxygen plasma treatment

Tomlin, Nathan A.; Curtin, Alexandra E.; White, M. G.; Lehman, John H.

doi:10.1016/j.carbon.2014.03.040

Cited by 33 publications

(31 citation statements)

References 21 publications

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“…VACNT growth is initially randomly oriented, until the growth forces a self-oriented vertical alignment. 11,17 Crust layers of tangled CNTs 17 and of amorphous carbon 18,19 can be formed on top of the VACNTs during growth. When the crust layer is removed so that incident radiation impinges directly on the VACNT surface, the reflectance of the VACNTs decreases.…”

Section: Discussionmentioning

confidence: 99%

“…When the crust layer is removed so that incident radiation impinges directly on the VACNT surface, the reflectance of the VACNTs decreases. 11 It has been shown that the crust layer can be removed via an oxygen plasma treatment, and that the oxygen plasma treatment also induces agglomeration of the tips that further reduces the reflectance, possibly because the tips are attracted by charging of nanotube defects and functionalization. 11 It has also been shown that amorphous carbon can be removed on single-wall carbon nanotubes via UV laser assisted oxidation 14 or thermally.…”

Section: Discussionmentioning

confidence: 99%

“…Changes in the surface morphology of VACNT samples has been shown to affect their reflectivity. 11,16 …”

Section: B Pre-and Post-exposure Characterizationmentioning

confidence: 99%

“…8,9 They are of particular value for these applications because they are very low reflectance (and therefore high absorptivity and emissivity) over a broader wavelength range than any other black coatings. 10,11 The reflectance, although still low, begins to increase at wavelengths below 600 nm. 12 Many applications that require a spectrally flat absorber would benefit from being able to further reduce the reflectance at these shorter wavelengths.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of short wavelength reflectance of multi-wall carbon nanotubes through ultraviolet laser irradiation

et al. 2018

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Multi-wall carbon nanotube coatings are used as broadband, low-reflectance absorbers for bolometric applications and for stray light control. They are also used as high emittance blackbody radiators. Irradiation of single wall carbon nanotubes with ultraviolet (UV) laser light has been shown to remove amorphous carbon debris, but there have been few investigations of the interaction of UV light with the more complex physics of multi-wall carbon nanotubes. We present measurements of reflectance and surface morphology before and after exposure of multi-wall carbon nanotube coatings to 248 nm UV laser light. We show that UV exposure reduces the reflectivity at wavelengths below 600 nm and present modeling of the thermal cycling the UV exposure causes at the surface of the carbon nanotubes. This effect can be used to flatten the spectral shape of the reflectivity curve of carbon nanotube absorber coatings used for broadband applications. Finally, we find that the effect of UV exposure depends on the nanotube growth process.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Changes in the surface morphology of VACNT samples has been shown to affect their reflectivity. 11,16 …”

Section: B Pre-and Post-exposure Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reduction of short wavelength reflectance of multi-wall carbon nanotubes through ultraviolet laser irradiation

et al. 2018

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“…Oxygen plasma treatments are also known as one of the most useful means to introduce oxygen functionalization on graphitic structures, including CNTs and graphene. Numerous previous studies have shown that oxygen plasma produces a large amount of oxygen containing radicals that are readily adsorbed by these materials [13][14][15][16][17][18][19]. The adsorption of oxygen alters the highly periodic π-bond networks of graphitic structures, which results in changes in their electrical, mechanical, chemical, and wetting properties.…”

Section: Introductionmentioning

confidence: 99%

Morphology engineering of hollow carbon nanotube pillars by oxygen plasma treatment

Aria

Lyon

Gharib

2015

Carbon

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Oxygen plasma treatment is introduced herein as a novel post-growth fabrication technique to engineer the macroscopic morphology of hollow carbon nanotube (CNT) pillars. Current fabrication techniques for patterned vertically-aligned CNTs only allow for the production of extruded structures with constant cross-sectional area. Oxygen plasma treatment is utilized to rectify this limitation by introducing variation to the cross-sectional area. The results presented herein demonstrate that a conical geometry can be successfully introduced by oxygen plasma treatment to a hollow cylindrical CNT pillars. Using oxygen plasma treatment, the blunt tip of a cylindrical CNT pillar can be controllably sharpened until it reaches a size reduction of more than 93%. A geometric model is presented herein to predict the morphology transformation of a hollow cylindrical CNT pillars during the oxygen plasma treatment. Three distinct phases of CNT structural and morphological evolution induced by oxygen plasma treatment are also identified. A mild CNT functionalization by oxygen adsorbates occurs in the first phase. The * Corresponding author: Morteza Gharib. Tel: (626) 395-4450 email: mgharib@caltech.edu second phase is indicated by drastic changes in the macroscopic morphology of CNT pillars.Structural amorphization and collapse of the base of the CNT pillars take place in the final phase.

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Advance in Using Plasma Technology for Modification or Fabrication of Carbon‐Based Materials and Their Applications in Environmental, Material, and Energy Fields

Sun

Bao

et al. 2020

Adv Funct Materials

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Plasma technology is an eco‐friendly way to modify or fabricate carbon‐based materials (CBMs) due to plasmas’ distinctive abilities in tuning the surface physicochemical properties by implanting functional groups or incorporating heteroatoms into the surface without changing the bulk structure. However, the mechanisms of functional groups formation on the carbon surface are still not clearly explained because of the variety of different discharge conditions and the complexity of plasma chemistry. Consequently, this paper contains a comprehensive review of plasma‐treated carbon‐based materials and their applications in environmental, materials, and energy fields. Plasma‐treated CBMs used in these fields have been significantly enhanced in recent years because these related materials possess unique features after plasma treatment, such as higher adsorption capacity, enhanced wettability, improved electrocatalytic activity, etc. Meanwhile, this paper also summarizes possible reaction routes for the generation of functional groups on CBMs. The outlook for future research is summarized, with suggestions that plasma technology research and development shall attempt to achieve precise control of plasmas to synthesize or to modify CBMs at the atomic level.

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Decrease in reflectance of vertically-aligned carbon nanotubes after oxygen plasma treatment

Cited by 33 publications

References 21 publications

Reduction of short wavelength reflectance of multi-wall carbon nanotubes through ultraviolet laser irradiation

Reduction of short wavelength reflectance of multi-wall carbon nanotubes through ultraviolet laser irradiation

Morphology engineering of hollow carbon nanotube pillars by oxygen plasma treatment

Advance in Using Plasma Technology for Modification or Fabrication of Carbon‐Based Materials and Their Applications in Environmental, Material, and Energy Fields

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