Ultrathin organic membranes: Can they sustain the quest for mechanically robust device applications?

Missale, Elena; Frasconi, Marco; Pantano, Maria F.

doi:10.1016/j.isci.2023.105924

“…Among these processed materials, films and membranes are important due to their potential usage in many fabricated electrical or mechanical devices. [25] There are several techniques to fabricate COF films using a bottom-up approach. [26,27] Some of the major limitations of this approach involve the scalability of the synthesis, lack of general compatibility with different COF compositions, and lack of control over the film thickness.…”

Section: Introductionmentioning

confidence: 99%

“…These methods have allowed some COFs to be processed into useful thin films, [3,6,17,18] composites, [19,20] nanotubes, [21,22] and gels [23,24] either via post‐synthetic processing of COF powders (top‐down approach) or directly synthesizing them from monomers (bottom‐up approach) (Figure 1). Among these processed materials, films and membranes are important due to their potential usage in many fabricated electrical or mechanical devices [25] . There are several techniques to fabricate COF films using a bottom‐up approach [26,27] .…”

Section: Introductionmentioning

confidence: 99%

Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

Senarathna,

Li,

Perera

et al. 2023

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Covalent organic frameworks (COFs) are known to be a promising class of materials for a wide range of applications, yet their poor solution processability limits their utility in many areas. Here we report a pore engineering method using hydrophilic side chains to improve the processability of hydrazone and β‐ketoenamine‐linked COFs and the production of flexible, crystalline films. Mechanical measurements of the free‐standing COF films of COF‐PEO‐3 (hydrazone‐linked) and TFP‐PEO‐3 (β‐ketoenamine‐linked), revealed a Young’s modulus of 391.7 MPa and 1034.7 MPa, respectively. The solubility and excellent mechanical properties enabled the use of these COFs in dielectric devices. Specifically, the TFP‐PEO‐3 film‐based dielectric capacitors display simultaneously high dielectric constant and breakdown strength, resulting in a discharged energy density of 11.22 J cm–3. This work offers a general approach for producing solution processable COFs and mechanically flexible COF‐based films, which hold great potential for use in energy storage and flexible electronics applications.

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“…In order to advance the applications of cellulose-based nanocomposite films, it is crucial to gain a comprehensive understanding of the self-assembly behavior that involves different length scales during the fabrication of the films. 29 This understanding will enable the correlation between polymer/nanofiller self-assembly and the resulting mechanical properties of the films, providing valuable information on the structure−processing−property relationship of cellulose-based nanocomposite systems that will support the development of robust devices with advanced performance.…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocrystal Composites with Enhanced Mechanical Properties for Robust Transparent Thin Films

Missale,

Maniglio,

Speranza

et al. 2023

ACS Appl. Nano Mater.

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Cellulose is attracting increasing interest as a sustainable technological material, owing to its unique combination of properties, such as abundance in nature, biodegradability, nontoxicity, cost effectiveness, and good mechanical properties. Here, we developed composite thin films based on carboxymethylcellulose (CMC) reinforced with TEMPO-oxidized cellulose nanocrystals (TOCNCs). The strength and stiffness of the CMC/ TOCNC nanocomposite film increased by ∼400% and ∼20%, respectively, compared to pure TOCNC films, while preserving the deformation capability of pure CMC films, the latter being less stiff, but more ductile than pure TOCNC films. We demonstrated the tunability of the CMC/TOCNC self-assembly, through Fe 3+ complexation, resulting in transparent cross-linked nanocomposite films with enhanced strength (163.5 ± 51.3 MPa) and stiffness (Young's modulus of 14.5 ± 4.0 GPa), with no significant loss in strain at failure (2.8 ± 1.1%). Finally, as applications of newly developed films require durability in realistic operating conditions, which do not involve static forces only, we tested our films against loading−unloading cycles, demonstrating robust and stable performance. By enabling a deeper understanding of the fabrication process and mechanical properties of cellulose-based nanocomposite films, this work expands their potential applications across a broad range of fields, from environment-related processes, such as decontamination, to the biomedical field.

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“…These methods have allowed some COFs to be processed into useful thin films, [3,6,17,18] composites, [19,20] nanotubes, [21,22] and gels [23,24] either via post‐synthetic processing of COF powders (top‐down approach) or directly synthesizing them from monomers (bottom‐up approach) (Figure 1). Among these processed materials, films and membranes are important due to their potential usage in many fabricated electrical or mechanical devices [25] . There are several techniques to fabricate COF films using a bottom‐up approach [26,27] .…”

Section: Introductionmentioning

confidence: 99%

Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

Senarathna,

Li,

Perera

et al. 2023

Angewandte Chemie

0

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Covalent organic frameworks (COFs) are known to be a promising class of materials for a wide range of applications, yet their poor solution processability limits their utility in many areas. Here we report a pore engineering method using hydrophilic side chains to improve the processability of hydrazone and β‐ketoenamine‐linked COFs and the production of flexible, crystalline films. Mechanical measurements of the free‐standing COF films of COF‐PEO‐3 (hydrazone‐linked) and TFP‐PEO‐3 (β‐ketoenamine‐linked), revealed a Young’s modulus of 391.7 MPa and 1034.7 MPa, respectively. The solubility and excellent mechanical properties enabled the use of these COFs in dielectric devices. Specifically, the TFP‐PEO‐3 film‐based dielectric capacitors display simultaneously high dielectric constant and breakdown strength, resulting in a discharged energy density of 11.22 J cm–3. This work offers a general approach for producing solution processable COFs and mechanically flexible COF‐based films, which hold great potential for use in energy storage and flexible electronics applications.

show abstract

Ultrathin organic membranes: Can they sustain the quest for mechanically robust device applications?

Cited by 13 publications

References 80 publications

Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

Cellulose Nanocrystal Composites with Enhanced Mechanical Properties for Robust Transparent Thin Films

Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

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