Freestanding 2D Arrays of Silver Nanorods

Gunawidjaja, Ray; Jiang, Chaoyang; Ko, Hyunhyub; Tsukruk, Vladimir V.

doi:10.1002/adma.200600540

Cited by 33 publications

(29 citation statements)

References 48 publications

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“…Indeed, our preliminary studies indicate planar conductivity within these membranes at a certain nanowire volume fraction. [58] Moreover, the uniform orientation of nanowires or other ordered arrangements could result in LbL films with controlled directional conductivity and optical response.…”

Section: Discussionmentioning

confidence: 99%

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Flexible and Robust 2D Arrays of Silver Nanowires Encapsulated within Freestanding Layer-by-Layer Films

et al. 2006

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Freestanding layer‐by‐layer (LbL) films encapsulating controlled volume fractions (ϕ = 2.5–22.5 %) of silver nanowires are fabricated. The silver nanowires are sandwiched between poly(allylamine hydrochloride)/poly(styrene sulfonate) (PAH/PSS) films resulting in nanocomposite structures with a general formula of (PAH/PSS)10PAH Ag(PAH/PSS)10PAH. The Young's modulus, toughness, ultimate stress, and ultimate strain are evaluated for supported and freestanding structures. Since the diameter of the nanowires (73 nm) is larger than the thickness of the LbL films (total of about 50 nm), a peculiar morphology is observed with the silver nanowires protruding from the planar LbL films. Nanowire‐containing LbL films possess the ability to sustain significant elastic deformations with the ultimate strain reaching 1.8 %. The Young's modulus increases with increasing nanowire content, reaching about 6 GPa for the highest volume fraction, due to the filler reinforcement effect commonly observed in composite materials. The ultimate strengths of these composites range from 60–80 MPa and their toughness reaches 1000 kJ m–3 at intermediate nanowire content, which is comparable to LbL films reinforced with carbon nanotubes. These robust freestanding 2D arrays of silver nanowires with peculiar optical, mechanical, and conducting properties combined with excellent micromechanical stability could serve as active elements in microscopic acoustic, pressure, and photothermal sensors.

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Section: Discussionmentioning

confidence: 99%

“…Earlier, we have also demonstrated the significant in-plane conductivity of LbL nanoscale membranes when the silver nanowire content exceeds the 2D percolation limit. [58] 2. Results and Discussion…”

Section: Introductionmentioning

confidence: 99%

Flexible and Robust 2D Arrays of Silver Nanowires Encapsulated within Freestanding Layer-by-Layer Films

et al. 2006

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“…The mechanical deflections in the outof-plane direction were monitored and the interference pattern was recorded by a CCD camera. The elastic modulus, residual stress, and toughness of the silk fibroin films were achieved by analysis of the pressure-deflection curves using the model of elastic deformation of a circular plate clamped to a stiff edge, as being detailed in the literature [47]. For buckling tests, the freely suspended silk fibroin LbL films fabricated on a sacrificial layer were transferred onto an elastic PMDS substrate, which was then compressed to induce the buckling instability patterns.…”

Section: Methodsmentioning

confidence: 99%

“…7a) can be utilized to derive the micromechanical properties of the silk fibroin LbL films, such as elastic modulus, residual stress, and toughness by using the theory of the elastic deformation of freely suspended plates. [47] The elastic modulus determined from this plot was 6.5 ± 2.0 GPa for the methanol-treated silk films. Therefore, the comparison indicated similar mechanical behavior of silk films under compressive and tensile stresses.…”

Section: Mechanical Properties Of Silk Fibroin Films Under Tensile Stmentioning

confidence: 99%

Mechanical Properties of Robust Ultrathin Silk Fibroin Films

Jiang

Wang

Gunawidjaja

et al. 2007

Adv Funct Materials

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Robust ultrathin multilayer films of silk fibroin were fabricated by spin coating and spin‐assisted layer‐by‐layer assembly and their mechanical properties were studied both in tensile and compression modes for the first time. The ultrathin films were characterized by a high elastic modulus of 6–8 GPa (after treatment with methanol) with the ultimate tensile strength reaching 100 MPa. The superior toughness is also many times higher than that usually observed for conventional polymer composites (328 kJ m–3 for the silk material studied here versus typical values of < 100 kJ m–3). These outstanding properties are suggested to be caused by the gradual development of the self‐reinforcing microstructure of highly crystalline β‐sheets, serving as reinforcing fillers and physical crosslinks, a process that is well known for bulk silk materials but it is demonstrated here to occur in ultrathin films as well, despite their limited dimensions. However, the confined state within films thinner than the lengths of the extended domains causes a significantly reduced elasticity which should be considered in the design of nanosized films from silk materials. Such regenerated silk fibroin films with outstanding mechanical strength have potential applications in microscale biodevices, biocompatible implants, and synthetic coatings for artificial skin.

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“…[31,[37][38][39][40][41][42] One of the intriguing examples, published by Kotov and co-workers, involved the fabrication of ultrastrong macroscopic films via the LbL incorporation of clay--a layered silicate material with a high inherent in-plane tensile stiffness reaching 270 GPa. [43,44] Introducing additional crosslinking into 1-1.5-mm-thick clay-polyelectrolyte composites effected an increase in the Young's modulus of up to 106 AE 11 GPa.…”

Section: Introductionmentioning

confidence: 99%

Flexible Silk–Inorganic Nanocomposites: From Transparent to Highly Reflective

Kharlampieva

Kozlovskaya

Gunawidjaja

et al. 2010

Adv Funct Materials

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A novel type of all‐natural, biocompatible, and very robust nanoscale free‐standing biohybrids are reported. They are obtained by integrating a silk fibroin matrix with functional inorganic nanoplatelets using a spin‐assisted layer‐by‐layer assembly. The organized assembly of the silk fibroin with clay (montmorillonite) nanosheets results in highly transparent nanoscale films with significantly enhanced mechanical properties, including strength, toughness, and elastic modulus, as compared to those for the pristine silk nanomaterials. Moreover, replacing clay nanoplatelets with a highly reflective Langmuir monolayer of densely packed silver nanoplates causes a similar enhancement of the mechanical properties, but in contrast to the materials above, highly reflective, mirror‐like, nanoscale flexible films are created. This strategy offers a new perspective for the fabrication of robust all‐natural flexible nanocomposites with exceptional mechanical properties important for biomedical applications, such as reinforced tissue engineering. On the other hand, the ability to convert silk‐based nanoscale films into mirror‐like biocompatible flexible films can be intriguing for prospective photonics and optical exploitation of these nanobiohybrids.

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Freestanding 2D Arrays of Silver Nanorods

Cited by 33 publications

References 48 publications

Flexible and Robust 2D Arrays of Silver Nanowires Encapsulated within Freestanding Layer-by-Layer Films

Flexible and Robust 2D Arrays of Silver Nanowires Encapsulated within Freestanding Layer-by-Layer Films

Mechanical Properties of Robust Ultrathin Silk Fibroin Films

Flexible Silk–Inorganic Nanocomposites: From Transparent to Highly Reflective

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