A simple method to control the microstructure and properties of sol–gel silica antireflective coatings

Sun, Yingying; Zheng, Jianguo; Huang, Rongchao; Zhang, Xin‐Xiang; Chen, Cuixia; Chen, Hanxian; Yan, Lianghong; Yang, Wenbin

doi:10.1039/c7ra04400c

Cited by 14 publications

(9 citation statements)

References 44 publications

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“…≈3.1%. The results described herein compare favorably with previous reports on hydrophobic ARCs synthesized via grafting 18,35,37 and co-condensation methods. 28,30,46 In contrast to earlier reports, these results were based on in situ EP and transmittance measurements, thereby providing evidence for the effectiveness of the ARC 1:1f samples in withstanding humidity conditions near saturation and repeated humidity cycles.…”

Section: Research Articlesupporting

confidence: 88%

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Robust operation of mesoporous antireflective coatings under variable ambient conditions

Reid¹,

Chen²,

Schmidt‐Hansberg³

et al. 2017

Preprint

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Antireflective coatings (ARCs) are important components in optical applications due to their ability to reduce reflection and maximize transmission of light across interfaces. Generating mesoporous films with adequate film thickness and refractive index is a common method to achieve amplitude and phase matching in low-cost single- layer interference-based ARCs. For high surface energy materials, pores on the 2 - 50 nm, i.e. the sub-wavelength scale, are subject to capillary condensation, and pore filling by surrounding gas phase water molecules at size-characteristic humidity values 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 post-synthesis 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 nm to 700 nm. Crucially, the AR performance was maintained at high humidity values with an average transmittance decrease of only 0.2% and maximum values maintained at 99.7 %, which compared to maximum and average losses of 3.6% and 2.7 %, respectively, for non-functionalized reference samples. The ARCs were shown to withstand at least 50 humidity cycles, indicating long-term stability against fluctuating environmental conditions.

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Section: Research Articlesupporting

confidence: 88%

“…Recently, a number of studies reported on the successful generation of grafted ARCs. 16,25,33,35 However, previous reports lacked in situ characterization of the optical properties as a function of humidity. Furthermore, the porosity values and thus refractive indices were not matched to obtain ideal AR performance after grafting.…”

Section: Introductionmentioning

confidence: 99%

Robust operation of mesoporous antireflective coatings under variable ambient conditions

Reid¹,

Chen²,

Schmidt‐Hansberg³

et al. 2017

Preprint

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show abstract

“…Recently, a number of studies were reported on the successful generation of grafted ARCs. 18,27,35,37 However, previous reports lacked in situ characterization of the optical properties as a function of humidity. Furthermore, the porosity values and thus refractive indices were not matched to obtain ideal AR performance after grafting.…”

mentioning

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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“…As discussed before, the modification efficiency of NCC with PMHS was closely related to hydrogen content of –Si–H in PMHS. PMHS is a dimethyl polysiloxane with the general structure of (CH 3 ) 3 SiO(CH 3 HSiO) m ((CH 3 ) 2 SiO) n Si(CH 3 ) 3 [21]. There are two kinds of repeat units on the PMHS molecule, which contains abundant reactive Si-H groups and hydrophobic –CH 3 groups.…”

Section: Resultsmentioning

confidence: 99%

An Effective, Economical and Ultra-Fast Method for Hydrophobic Modification of NCC Using Poly(Methylhydrogen)Siloxane

You

et al. 2019

Polymers

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Poor compatibility between nanocellulose crystals (NCCs) and major polymers has limited the application of NCC as bio-reinforcements. In this work, an effective and ultra-fast method was investigated to significantly improve the hydrophobicity of NCC by using poly(methylhydrogen)siloxane (PMHS) as modifier. PMHS possessed amounts of reactive –Si–H groups and hydrophobic –CH3 groups. The former groups were reactive with the hydroxyl groups of NCC, while the latter groups afforded NCC very low surface energy. As the weight ratio of PMHS to NCC was only 0.0005%, the hydrophobicity of NCC was significantly improved by increasing the water contact angle of NCC from 0° to 134°. The effect of weight ratio of PMHS to NCC and the hydrogen content of –Si–H in PMHS on the hydrophobicity and thermal stability was investigated in detail by Fourier transform infrared spectroscopy (FTIR), (X-ray Diffraction) XRD and (thermogravimetric analysis) TGA. The results indicated that PMHS chains were covalently grafted onto NCC and PMHS modification improved the thermal stability of NCC.

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A simple method to control the microstructure and properties of sol–gel silica antireflective coatings

Abstract: To control the microstructure and properties of sol–gel silica antireflective (AR) coatings, a simple PMHS (poly(methylhydrogen)siloxane) surface modification method was applied and investigated.

Cited by 14 publications

References 44 publications

Robust operation of mesoporous antireflective coatings under variable ambient conditions

Robust operation of mesoporous antireflective coatings under variable ambient conditions

Robust Operation of Mesoporous Antireflective Coatings under Variable Ambient Conditions

An Effective, Economical and Ultra-Fast Method for Hydrophobic Modification of NCC Using Poly(Methylhydrogen)Siloxane

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