A facile hybrid approach to high-performance broadband antireflective thin films with humidity resistance as well as mechanical robustness

Li, Tong; He, Junhui

doi:10.1039/c6tc01540a

Cited by 29 publications

(20 citation statements)

References 32 publications

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“…This approach provides a viable alternative for the testing of environmental durability of coatings, compared to the standard tests that involve exposing the sample to constant RH values for extended periods of time followed by measurement of the material properties ex situ. 19,46 In earlier works on silica-based networks, repeated cycles of water adsorption and desorption demonstrated an impact on the mechanical integrity of the porous skeleton as well as hydrophobicity via capillary stresses and irreversible adsorption of water molecules within the pores. 47−49 In the present study, the ARC 1:1f sample maintained both its hydrophobicity and AR capabilities after 50 EP cycles.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 99%

Robust Operation of Mesoporous Antireflective Coatings under Variable Ambient Conditions

Reid

Taylor

Chen

et al. 2018

ACS Appl. Mater. Interfaces

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Generating mesoporous films with adequate film thickness and refractive index is a common method to achieve amplitude and phase matching in low-cost interference-based antireflective coatings (ARCs). For high-surface-energy materials, pores on the 2−50 nm (i.e., on the subwavelength scale) are subject to capillary condensation by surrounding gas phase water molecules, which hampers their functioning. In this work, we examine the effect of relative humidity on mesoporous ARCs and present a simple method for the preparation of ARCs with robust operation under variable conditions. The materials route is based on the generation of well-defined porous aluminosilicate networks by block copolymer co-assembly with poly(isobutylene)-block-poly(ethylene oxide) and postsynthesis grafting of trichloro(octyl)silane molecules to the pore walls. The functionalized films exhibited a maximum transmittance value of 99.8%, with an average transmittance of 99.1% in the visible wavelength range from 400 to 700 nm. Crucially, the antireflection performance was maintained at high humidity values, with an average transmittance decrease of only 0.2% and maximum values maintained at 99.7%. This compared to maximum and average losses of 3.6 and 2.7%, respectively, for nonfunctionalized reference samples. The ARCs were shown to retain their optical properties within 50 humidity cycles, indicating long-term stability against fluctuating environmental conditions.

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Section: Acs Applied Materials and Interfacesmentioning

confidence: 99%

Robust Operation of Mesoporous Antireflective Coatings under Variable Ambient Conditions

Reid

Taylor

Chen

et al. 2018

ACS Appl. Mater. Interfaces

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“…Meanwhile, as shown in Fig. 4, the moth-eye thin film also shows a more broadband AR property in contrast to the smooth nanoporous AR film derived only from a proper porosity 29 in the wavelength range of 750–1500 nm, indicating the nipples array of the film with a moth-eye effect also contributes to the optical properties besides the nanopores. In addition, the transmittances of the moth-eye thin film and glass substrate over incidence angles ranging from 0 to 60° were measured.…”

Section: Resultsmentioning

confidence: 93%

“…1 mm thick) at room temperature with a relative humidity of 15–20%. Finally, the as-prepared film was solidified at 60 °C, ultrasonically cleaned by water and calcined at 500 °C for 1 h. The smooth thin films were prepared by dip-coating the methyl-silica hybrid sol 29 . The control samples in Fig.…”

Section: Methodsmentioning

confidence: 99%

In situ formation of artificial moth-eye structure by spontaneous nano-phase separation

Zhang

et al. 2018

Sci Rep

Self Cite

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Unprecedented in situ formation of artificial moth-eye structure is demonstrated by spontaneous nano-phase separation of a silica-based system on substrate. The moth-eye thin film with a homogenously distributed nipples array shows broadband antireflection functionalities. The mechanism of nano-phase separation is unveiled as spinodal decomposition by chemical freezing method and thermodynamic analysis. The current method may provide a new avenue to ready fabrication of patterned nanostructures toward a variety of applications.

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“…[23,24] However, the inorganic fillers may deteriorate the optical transparency of the polymers by light scattering. [25][26][27][28][29] Thus, it is extremely challenging to achieve the enhancement of thermomechanical property without losing optical transparency. Okahisa et al reported optically transparent nanocomposites with a bacterial cellulose filler, [30] in which bacterial cellulose (50 nm wide) nanofibers appear virtually free from light scattering.…”

Section: Introductionmentioning

confidence: 99%

Optically Transparent and Low‐CTE Polyethersulfone‐Based Nanocomposite Films for Flexible Display

Kim

Lan

Kulkarni

et al. 2020

Adv Materials Inter

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Optically transparent and thermo‐mechanically stable nanocomposite films of polyethersulfone (PESU) and core–shell nanoparticles are prepared by a solvent casting and heat pressing method. As a filler, reactive ZnS‐SiO2 core–shell nanoparticles are prepared by a modified sol–gel process, of which reactive aromatic amine groups are chemically bonded with the polymer matrix. For optical transparency, the shell thickness is adjusted and the core diameter of the core–shell nanoparticles is adjusted to match the refractive index of PESU (nPESU = 1.65). For the composite film with more than 15 wt% of core–shell nanoparticles in PESU, the coefficient of thermal expansion is significantly reduced down to 12 ppm °C−1 in the temperature range of 30–90 °C, which is 80% less than the value of the bare PESU film (≈65 ppm °C−1). Furthermore, their mechanical property is also significantly improved. For 15 and 30 wt%, PESU nanocomposite films show 64 and 74 MPa of yield strength and 1.36 and 2.0 GPa of Young's modulus, respectively, while pure PESU films show only 44 MPa of the yield strength and 0.64 GPa of Young's modulus. Finally, the organic light emitting diode device is demonstrated on the PESU nanocomposite substrate.

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A facile hybrid approach to high-performance broadband antireflective thin films with humidity resistance as well as mechanical robustness

Abstract: Broadband high transmittance, humidity resistance and mechanical robustness are three important aspects that dictate the practical applications of antireflective thin films.

Cited by 29 publications

References 32 publications

Robust Operation of Mesoporous Antireflective Coatings under Variable Ambient Conditions

Robust Operation of Mesoporous Antireflective Coatings under Variable Ambient Conditions

In situ formation of artificial moth-eye structure by spontaneous nano-phase separation

Optically Transparent and Low‐CTE Polyethersulfone‐Based Nanocomposite Films for Flexible Display

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