Ultraviolet laser-induced damage of freestanding silica nanoparticle films

Chi, Fangting; Pan, Ning; Ding, Congcong; Wang, Xiaoqiang; Yi, Facheng; Li, Xiaofeng; Lei, Jiehong

doi:10.1016/j.apsusc.2018.08.243

Cited by 22 publications

(6 citation statements)

References 45 publications

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“…All of the coatings showed an equivalent laser-induced damage threshold to the substrate, which indicates that the laser-induced damage threshold is limited by the substrates, not by the sol–gel silica coatings. The trend is consistent with a recent report . Because it is much easier to prepare coatings with refractive indices around 1.20, our approach is expected to be relatively simpler than other methods.…”

Section: Resultssupporting

confidence: 91%

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Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

Chi

Zeng

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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Optical coatings with controllable ultralow refractive indices are of profound significance in optical areas. However, it remains a challenge to fabricate such coatings using a simple method. Here we develop an effective and simple approach to create ultra-low-index coatings. This approach was based on a modified sol–gel process, with a key process that involved the aggregation of silica nanoparticles via the addition of a polymer surfactant (e.g., polyvinylpyrrolydone) in sols before coating. The approach involves three steps: the synthesis of silica sols under ammonia catalysis in ethanol (Stöber method), the addition of polyvinylpyrrolydone in the silica sols to induce the aggregation of the silica nanoparticles, and the formation of ultra-low-index coatings by depositing the aggregated silica sols on substrates. Through varying the aggregation extent, this approach produced coatings with controllable refractive indices ranging from 1.17 to 1.07. To the best of our knowledge, the minimum index value of 1.07 from our coating is among the lowest refractive indices ever reported. The ultra-low-index coatings demonstrated excellent optical properties, with which perfect quarter-wavelength antireflection coatings (maximum transmittance ∼100%) and broadband antireflection coatings (transmittance >98% from 400 to 1100 nm) can be prepared. One advantage of the antireflection coatings is that their transmission is less dependent on the refractive index and the thickness of the stacking layer, which make it promising in large-scale production. Moreover, the coatings can be made hydrophobic (water contact angle 136°) by exposing the coatings to a hexamethyldisilazane atmosphere, exhibiting high environmental stability in a humid environment. The aggregation of silica nanoparticles in sol–gel processes provides a scalable alternative to the current approaches for creating ultra-low-index coatings.

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Section: Resultssupporting

confidence: 91%

“…The trend is consistent with a recent report. 53 Because it is much easier to prepare coatings with refractive indices around 1.20, our approach is expected to be relatively simpler than other methods.…”

Section: Resultsmentioning

confidence: 99%

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

Chi

Zeng

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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“…30 Silica is used in optical elements because of its antireection properties in high-power laser systems, which can improve the LIDT of the optical components. 31,32 Studies have mostly been conned to the laser parameters, including the pulse duration, 33 laser uence, 34 and wavelength, 35 as well as to the lm processing parameters including the thickness and organic groups 36 that affect the growth of the silica thin lm, such as its morphology and growth rate. However, studies have not modeled the relation between electromagnetic radiation and heat in the silicon dioxide thin lms.…”

Section: Introductionmentioning

confidence: 99%

A coupled model of electromagnetic and heat on nanosecond-laser ablation of impurity-containing aluminum alloy

et al. 2020

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“…Most heavy metal ions are toxic and constitute a serious health threat for humans and other species when existing in water, even at very low concentrations. A wide variety of materials such as zeolites, [22][23][24][25] clay, 26,27 resins, 28,29 metal-organic frameworks, 20,30,31 and covalent organic frameworks 32,33 have been explored. Among these approaches, adsorption is known to be most promising because of its convenience of operation, low cost, and availability of a diversity of adsorbent materials.…”

Section: Introductionmentioning

confidence: 99%

Polymer brushes on graphene oxide for efficient adsorption of heavy metal ions from water

Liu

Ding

Chi

et al. 2019

J of Applied Polymer Sci

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The pollution of heavy metal ions in water poses a serious threat to human being and ecosystems. Here, we report polyamidoxime (PAO) brush grafted graphene oxide (GO) as a highly efficient adsorbent for extraction of toxic metal cations from water. Surface-initiated atom transfer radical polymerization was used to grow polyacrylonitrile (PAN) brushes on GO, followed by conversion of the nitrile groups in PAN into amidoxime groups, which had high binding affinity toward heavy metal cations. The PAO brush grafted GO demonstrated significantly fast adsorption kinetics and large adsorption capacity. At optimal pH 5, the PAO brush grafted GO can achieve maximum adsorption capacities of 116.7 mg g −1 for Pb(II), 258.6 mg g −1 for Ag(I), 192.2 mg g −1 for Cu(II), and 167.9 mg g −1 for Fe(III), which were significantly larger than those of small molecule functionalized GO. Mechanism analysis suggested that the enhanced adsorption performance was due to the myriads of functional groups in PAO brushes that were easily accessible to metal ions because of the swelling of the polymer brushes in water.

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Ultraviolet laser-induced damage of freestanding silica nanoparticle films

Cited by 22 publications

References 45 publications

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

A coupled model of electromagnetic and heat on nanosecond-laser ablation of impurity-containing aluminum alloy

Polymer brushes on graphene oxide for efficient adsorption of heavy metal ions from water

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