Iridescence of Patterned Carbon Nanotube Forests on Flexible Substrates: From Darkest Materials to Colorful Films

Hsieh, Kuo-Huang; Tsai, Tsung-Yen; Wan, Dehui; Chen, Hsuen‐Li; Tai, Nyan‐Hwa

doi:10.1021/nn901910h

Cited by 41 publications

(23 citation statements)

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“…Thus, patterning of intrinsically interesting materials with nanoscale dimensions has been achieved; including graphene, [137] carbon nanotubes [138] or proteins. [139] The creation of ordered arrays of pillars in conventional substrate materials as silicon or glass induces superhydrophobicity [14] and has been used to prepare antireflective [140] and self-cleaning materials.…”

Section: Non-conventional Colloidal Lithographymentioning

confidence: 99%

Surface Patterning with Colloidal Monolayers

Vogel

2012

Springer Theses

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This thesis focuses on the controlled assembly of monodisperse polymer colloids into ordered two-dimensional arrangements. These assemblies, commonly referred to as colloidal monolayers, are subsequently used as masks for the generation of arrays of complex metal nanostructures on solid substrates.The motivation of the research presented here is twofold. First, monolayer crystallization methods were developed to simplify the assembly of colloids and to produce more complex arrangements of colloids in a precise way. Second, various approaches to colloidal lithography are designed with the aim to include novel features or functions to arrays of metal nanostructures.The air/water interface was exploited for the crystallization of colloidal monolayer architectures as it combines a two-dimensional confinement with a high lateral mobility of the colloids that is beneficial for the creation of high long range order. A direct assembly of colloids is presented that provides a cheap, fast and conceptually simple methodology for the preparation of ordered colloidal monolayers. The produced two-dimensional crystals can be transformed into nonclose-packed architectures by a plasma-induced size reduction step, thus providing valuable masks for more sophisticated lithographic processes. Finally, the controlled co-assembly of binary colloidal crystals with defined stoichiometries on a Langmuir trough is introduced and characterized with respect to accessible configurations and size ratios.Several approaches to lithography are presented that aim at introducing different features to colloidal lithography. First, using metal-complex containing latex particles, the synthesis of which is described as well, symmetric arrays of metal nanoparticles can be created by controlled combustion of the organic material of the colloids. The process does not feature an inherent limit in nanoparticle size and is able to produce complex materials as will be demonstrated for FePt alloy particles. Precise control over both size and spacing of the particle array is presented.Second, two lithographic processes are introduced to create sophisticated nanoparticle dimer units consisting of two crescent shaped nanostructures in close proximity; essentially by using a single colloid as mask to generate two structures simultaneously. Strong coupling processes of the parental plasmon resonances of the two objects are observed that are accompanied by high near-field enhancements. A plasmon hybridization model is elaborated to explain all polarization dependent shifts of the resonance positions. Last, a technique to produce laterally patterned, ultra-flat substrates without surface topographies by embedding gold nanoparticles in a silicon dioxide matrix is applied to construct robust and re-usable sensing architectures and to introduce an approach for the nanoscale patterning of solid supported lipid bilayer membranes.

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Section: Non-conventional Colloidal Lithographymentioning

confidence: 99%

Surface Patterning with Colloidal Monolayers

Vogel

2012

Springer Theses

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“…(1) can be easily established. The validity of the above condition for low density CNT arrays can be supported by analyzing the values of κ/n calculated theoretically in the literature: ≈ 0.036 -visible range [7] and ≈ 0.0096 -visible range [1]. Assuming that coefficients r (s,p) ij smoothly depend on wavelength and incidence angle, we can show that the extremes of the function R (s,p) (λ, θ) are mainly determined by the extremes of the function φ(λ, θ).…”

Section: Resultsmentioning

confidence: 80%

“…The blackbody behavior of carbon nanotubes arrays manifesting itself with extremely low reflectance level [2,5] is related to a process of trapping and multiple reflections of electromagnetic radiation within a sparse array of MWCNTs [6,7]. For a quantitative discussion of this issue and other optical phenomena in such systems, two approaches are usually applied.…”

Section: Introductionmentioning

confidence: 99%

Optical Interference Effects in Visible-Near Infrared Spectral Range for Arrays of Vertically Aligned Multiwalled Carbon Nanotubes

et al. 2017

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Based on the reflectance spectra for radiation wavelength from about 380 nm to 1.8 µm, the optical interference effects in vertically aligned multiwalled carbon nanotubes films are studied. We performed the measurements for two complementary polarization states of incoming radiation (s-and p-polarization) for nanotubes arrays sparse enough for interference effects to be possible to observe. By performing the measurements for different wavelengths and incidence angles, we mapped the evolution of interference maxima/minima of reflectance signal. The results from this novel approach indicate that for the radiation polarized perpendicularly to tubes axis (s-polarization), the real part of the effective refractive index can be estimated from the classic Fabry-Pérot model. In order to describe the differences between spectra obtained for s-and p-polarizations we discuss the most important factors that affect the reflectance signal in case of investigated nanotubes arrays.

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“…The porosity of carbon nano tubes could be another reason behind the absorption of all the incident light [4]. As a black body material, the carbon nano-tubes revealed different interesting characteristics such as if the height of VACNTs is less than 500nm then it can produce colorful iridescence being reflected from the substrate [5]. Through micro mechanical treatment on the top surface of vertically aligned CNTs, the maximum reflectance was shown up to 15% having different applications as described in [6][7][8].…”

Section: Introductionmentioning

confidence: 99%