Polymer infiltration synthesis of inorganic nanoporous coatings: Does polymer template affect their properties?

Omotosho, Khalil D.; Tran, John; Shevchenko, Elena V.; Berman, Diana

doi:10.1016/j.surfcoat.2022.129107

Cited by 5 publications

(6 citation statements)

References 54 publications

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“…However, ZnO has been reported to crystallize at a much lower temperature of 300 • C [35]. The crystalline nature of the ZnO conformal coatings synthesized using polymer templates was confirmed in our previous studies [7,8].…”

Section: Volume Of Pores Filled With Ethanol (Cm 3 )supporting

confidence: 67%

“…However, compared to the porous ZnO coatings obtained using PS75-b-P4VP25 BCP templates, the porous AlO x fabricated with the BCP template is much softer, possibly due to the morphology and nature of porosity in the coatings, which can be seen in the SEM images above (Figure 5b,d). Moreover, at the polymer removal temperature (~450 • C), the porous AlO x remains amorphous [31][32][33], whereas the temperature was sufficient to crystallize ZnO coating [8,34,35]. Though grain refinement can help to increase the yield and tensile strength of materials leading to the higher mechanical robustness of amorphous structures in comparison to the crystalline structures, this is usually true for bulk materials only.…”

Section: Volume Of Pores Filled With Ethanol (Cm 3 )mentioning

confidence: 99%

“…Polymer templates serve as an excellent platform to prepare highly porous hybrid and all-inorganic structures, opening new routes to creating porous materials for various applications, including sensors [7,8], separation membranes [2], anti-reflective coatings [9,10], and oil absorbing foams [11]. Infiltration of the polymer assemblies with different patterns and geometries with inorganic precursors is of great interest for the design of porous nanostructures with unique mechanical, electrical, magnetic, thermal, catalytic, and optical properties [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of BCP templates, the porosity of the final all-inorganic coating can be efficiently tuned by the volume fraction of the polar domains in the BCP and by the number of SIS cycles [9,16]. In turn, when porous polymers are used as templates, the porosity of the final coatings depends on the structure of the polymer [8]. Porous AlO x and ZnO-based structures are among the most promising materials for optical and sensing applications [1,7].…”

Section: Introductionmentioning

confidence: 99%

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Accessibility and Mechanical Stability of Nanoporous Zinc Oxide and Aluminum Oxide Coatings Synthesized via Infiltration of Polymer Templates

Omotosho,

Lyon,

Shevchenko

et al. 2023

Polymers

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The conformal nanoporous inorganic coatings with accessible pores that are stable under applied thermal and mechanical stresses represent an important class of materials used in the design of sensors, optical coatings, and biomedical systems. Here, we synthesize porous AlOx and ZnO coatings by the sequential infiltration synthesis (SIS) of two types of polymers that enable the design of porous conformal coatings—polymers of intrinsic microporosity (PIM) and block co-polymer (BCP) templates. Using quartz crystal microbalance (QCM), we show that alumina precursors infiltrate both polymer templates four times more efficiently than zinc oxide precursors. Using the quartz crystal microbalance (QCM) technique, we provide a comprehensive study on the room temperature accessibility to water and ethanol of pores in block copolymers (BCPs) and porous polymer templates using polystyrene-block-poly-4-vinyl pyridine (PS75-b-P4VP25) and polymers of intrinsic microporosity (PIM-1), polymer templates modified by swelling, and porous inorganic coatings such as AlOx and ZnO synthesized by SIS using such templates. Importantly, we demonstrate that no structural damage occurs in inorganic nanoporous AlOx and ZnO coatings synthesized via infiltration of the polymer templates during the water freezing/melting cycling tests, suggesting excellent mechanical stability of the coatings, even though the hardness of the inorganic nanoporous coating is affected by the polymer and precursor selections. We show that the hardness of the coatings is further improved by their annealing at 900 °C for 1 h, though for all the cases except ZnO obtained using the BCP template, this annealing has a negligible effect on the porosity of the material, as is confirmed by the consistency in the optical characteristics. These findings unravel new potential for the materials being used across various environment and temperature conditions.

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Section: Volume Of Pores Filled With Ethanol (Cm 3 )supporting

confidence: 67%

Section: Volume Of Pores Filled With Ethanol (Cm 3 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accessibility and Mechanical Stability of Nanoporous Zinc Oxide and Aluminum Oxide Coatings Synthesized via Infiltration of Polymer Templates

Omotosho,

Lyon,

Shevchenko

et al. 2023

Polymers

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“…Although initially regarded as problematic, , SIS has developed into a powerful extension of ALD to create organic/inorganic hybrid materials with novel properties. , SIS enables a broad range of materials and allows the interfacial and bulk chemistry to be tuned with intimate control over thickness, gradient structure, and stoichiometry. In addition, the polymer membrane can be used as a scaffold or template to create inorganic or hybrid organic–inorganic materials via SIS with tailored 3D nano/microstructure. − …”

Section: Introductionmentioning

confidence: 99%

Controlling Nanoscale Pore Size and Wall Composition in Polycarbonate Membranes via Atomic Layer Deposition and Sequential Infiltration Synthesis: Implications for High Water Permeance

Pathak,

Rozyyev,

Shevate

et al. 2023

ACS Appl. Nano Mater.

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Polymer membranes have a wide variety of applications, ranging from water treatment to energy storage. Many of these applications require precise control over the membrane porosity and surface chemistry. In this study, we explore the modification of isoporous polycarbonate (PC) track-etched membranes (PCTEs) by atomic layer deposition (ALD) and sequential infiltration synthesis (SIS) to tune the pore size and the pore wall surface chemistry. We first performed a detailed study of Al 2 O 3 ALD and SIS in PCTE using a variety of in situ and ex situ measurements. We discovered that short precursor exposure times are critical to achieve conformal Al 2 O 3 ALD in the PCTE nanopores, while longer precursor exposure times resulted in Al 2 O 3 SIS within the bulk of the PC leaving the membranes brittle. Next, we tuned the PCTE pore size via Al 2 O 3 ALD and studied its effect on the water contact angle and the water permeance. We found that the membranes became more hydrophilic, and the permeance decreased with increasing ALD Al 2 O 3 cycles. Finally, we studied the effect of hydrophilic (SnO 2 )/hydrophobic (In 2 O 3 ) ALD metal oxide coatings on membrane properties. We found that the most hydrophilic SnO 2 showed the highest water flux and the least hydrophilic In 2 O 3 showed the lowest water flux through the PCTE membranes. Our results demonstrate that ALD is an effective method to tune the surface and transport properties of PCTE membranes, but care must be exercised to avoid SIS and bulk modification of the polymer.

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Robust polymer hybrid and assembly materials from structure tailoring to efficient catalytic remediation of emerging pollutants

Ali,

Khan,

song

et al. 2024

Chemosphere

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Polymer infiltration synthesis of inorganic nanoporous coatings: Does polymer template affect their properties?

Cited by 5 publications

References 54 publications

Accessibility and Mechanical Stability of Nanoporous Zinc Oxide and Aluminum Oxide Coatings Synthesized via Infiltration of Polymer Templates

Accessibility and Mechanical Stability of Nanoporous Zinc Oxide and Aluminum Oxide Coatings Synthesized via Infiltration of Polymer Templates

Controlling Nanoscale Pore Size and Wall Composition in Polycarbonate Membranes via Atomic Layer Deposition and Sequential Infiltration Synthesis: Implications for High Water Permeance

Robust polymer hybrid and assembly materials from structure tailoring to efficient catalytic remediation of emerging pollutants

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