Polydimethylsiloxane films engineered for smart nanostructures

Töpper, Tino; Osmani, Bekim; Müller, Bert

doi:10.1016/j.mee.2018.02.029

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…Different optical methods can be used, such as white light interferometry, laser profilometry, and transmission or reflection spectrometry. [5] Commonly for large-scale production of dielectric elastomers, thicknesses of 20 micron are desired, but novel techniques allow for the production of even thinner films, even submicron, [6][7][8] where sensitivity to thickness variations is even greater.…”

Section: Introductionmentioning

confidence: 99%

Weibull Analysis of Electrical Breakdown Strength as an Effective Means of Evaluating Elastomer Thin Film Quality

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Weibull Analysis of Electrical Breakdown Strength as an Effective Means of Evaluating Elastomer Thin Film Quality

et al. 2018

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“…It has been shown that the elastic modulus increases in line with dose for a given deposition rate. 32 As a consequence, we are convinced that a lower UV irradiation dose than used in the present study will result in much softer Au/SH-PDMS electrodes.…”

Section: Mechanical Properties Derived From Atomic Force Microscopy Nmentioning

confidence: 54%

Conducting and stretchable nanometer-thin gold/thiol-functionalized polydimethylsiloxane films

2018

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Abstract. Future low-voltage dielectric elastomer transducers (DETs), based on nanometer-thin elastomer membranes, will rely on soft and compliant electrodes with reasonable electrical conductivity and sound adhesion to the elastomer. State-of-the-art adhesion promoters, including nanometer-thin Cr/Ti films, result in defects for applied areal strains larger than 3% and lead to increases in the stiffness of DETs. To generate forces in the Newton range, these low-voltage DETs have to be stacked in thousands of layers. Herein, we present a compliant electrode, which consists of gold bonded covalently to thiol-functionalized polydimethylsiloxane (SH-PDMS) films. The membranes were fabricated using molecular beam deposition and in situ and/or subsequent ultraviolet light (UV) radiation. Peel-off tests demonstrate the expected strong binding of Au to the SH-PDMS network, with this highly stretchable Au/SH-PDMS layer capable of withstanding strains of at least 60%, without losing conductivity. Optical micrographs show signs of cracks for strained pure Au and Au/Cr electrodes but not for the Au/SH-PDMS layer. The mechanical properties and adhesion forces of Au/SH-PDMS were extracted by means of atomic force microscopy (AFM), using a spherical Au tip coated with methyl groups (CH 3 ). The elastic modulus of ð12 AE 9Þ MPa increased slightly against the 20-nm-thin Au/PDMS example, but it can be tailored by the cross-linking density of Au/SH-PDMS via the UV irradiation dose. Unloading nanoindentation curves revealed pull-off forces between the CH 3 -functionalized AFM tip and the Au/SH-PDMS layer at the time of separation. For Au/SH-PDMS, the spectral distribution of pull-off forces exhibits repulsive forces with the CH 3 groups of the PDMS network as well as adhesive forces resulting from interactions with the nanometer-sized Au clusters. This approach provides the means to bind gold clusters homogenously within the SH-PDMS film. Such compliant electrodes are the prerequisite for fabricating low-voltage DETs that can be stretched by more than 50%.

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“…These properties can be improved through chemical modifications . PDMS also has advantages such as chemical inertness, stability over a wide range of temperatures, transparency, and the ability to tune both mechanical properties and surface adhesiveness …”

Section: Replicating Properties Of Skinmentioning

confidence: 99%

Using Artificial Skin Devices as Skin Replacements: Insights into Superficial Treatment

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et al. 2019

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Artificial skin devices are able to mimic the flexibility and sensory perception abilities of the skin. They have thus garnered attention in the biomedical field as potential skin replacements. This Review delves into issues pertaining to these skin‐deep devices. It first elaborates on the roles that these devices have to fulfill as skin replacements, and identify strategies that are used to achieve such functionality. Following which, a comparison is done between the current state of these skin‐deep devices and that of natural skin. Finally, an outlook on artificial skin devices is presented, which discusses how complementary technologies can create skin enhancements, and what challenges face such devices.

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Polydimethylsiloxane films engineered for smart nanostructures

Cited by 6 publications

References 36 publications

Weibull Analysis of Electrical Breakdown Strength as an Effective Means of Evaluating Elastomer Thin Film Quality

Weibull Analysis of Electrical Breakdown Strength as an Effective Means of Evaluating Elastomer Thin Film Quality

Conducting and stretchable nanometer-thin gold/thiol-functionalized polydimethylsiloxane films

Using Artificial Skin Devices as Skin Replacements: Insights into Superficial Treatment

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