Incubation and ablation behavior of poly(dimethylsiloxane) for 266 nm irradiation

Graubner, Vera-Maria; Jordan, Rainer; Nuyken, Oskar; Lippert, Thomas; Hauer, M.; Schnyder, B.; Wokaun, Alexander

doi:10.1016/s0169-4332(02)00415-4

Cited by 48 publications

(25 citation statements)

References 21 publications

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“…Additionally, gold does not form a surface oxide, making it suitable for electrode recording sites (Cogan 2008). PDMS shape and topography can be controlled by several methods, including photosensitive polymerization, laser ablation, reactive ion etching (RIE), and micromolding (Garra et al 2002;Graubner et al 2002;Sayah et al 2007;Sia and Whitesides 2003).…”

Section: Introductionmentioning

confidence: 99%

Highly-compliant, microcable neuroelectrodes fabricated from thin-film gold and PDMS

McClain

Clements

Shafer

et al. 2011

Biomed Microdevices

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Bio-electrodes have traditionally been made of materials such as metal and silicon that are much stiffer than the tissue from which they record or stimulate. This difference in mechanical compliance can cause incomplete or ineffective contact with the tissue. The electrode stiffness has also been hypothesized to cause chronic low-grade injury and scar-tissue encapsulation, reducing stimulation and recording efficiency. As an initial step to resolve these issues with electrode performance, we have developed and characterized electrically-functional, low-Young's modulus, microcable-shaped neuroelectrodes and demonstrated electrophysiological recording functionality. The microcable geometry gives the electrodes a similar footprint to traditional wire and microwire neuroelectrodes, while reducing the difference in Young's modulus from nervous tissue by orders of magnitude. The electrodes are composed of PDMS and thin-film gold, affording them a high-level of compliance that is well suited for in vivo applications. The composite Young's modulus of the electrode was experimentally determined to be 1.81 ± 0.01 MPa. By incorporating a high-tear-strength silicone, Sylgard 186, the load at failure was increased by 92%, relative to that of the commonly used Sylgard 184. The microcable electrodes were also electromechanically tested, with measurable conductivity (220 kΩ) at an average 8% strain (n = 2) after the application of 200% strain. Electrophysiological recording is demonstrated by wrapping the electrode around a peripheral nerve, utilizing the compliance and string-like profile of the electrode for effective recording in nerve tissue.

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Section: Introductionmentioning

confidence: 99%

Highly-compliant, microcable neuroelectrodes fabricated from thin-film gold and PDMS

McClain

Clements

Shafer

et al. 2011

Biomed Microdevices

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“…7 The reported damage threshold fluence at 266 nm wavelength for an undoped PDMS film ͑thickness 250 m͒ was approximately 470 mJ/ cm 2 . 6 The reported values of the optical absorption coefficient of carbon black at 532 nm are approximately in the range of 0.25ϫ 10 5 -1ϫ 10 5 cm −1 . 8 The carbon black doped PDMS film used in this study has high optical absorbance ͑similar to absorbance of undoped PDMS at 266 nm͒, and hence the laser fluence of 700 mJ/ cm 2 caused damage to the PDMS film.…”

Section: -2mentioning

confidence: 98%

“…The details of the damage caused to the PDMS film are beyond the scope of the paper and have been discussed elsewhere. 6,9 The laser fluence of 100 pulses measured using the power meter ͑dotted line͒ and photoacoustic measurement technique ͑solid line͒ is shown in Fig. 7.…”

Section: -2mentioning

confidence: 99%

Photoacoustic technique to measure beam profile of pulsed laser systems

Mallidi

Emelianov

2009

Review of Scientific Instruments

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The beam profiles of pulsed lasers are currently measured using either complementary metal oxide semiconductor ͑CMOS͒ or charge coupled device ͑CCD͒ cameras. Despite providing high-resolution beam profiles, these devices cannot work with high power lasers. If additional optical attenuators are used, beam distortions may occur. In this paper we demonstrate a high-resolution photoacoustic technique capable of measuring the beam profile of pulsed lasers. The beam profiles of a pulsed neodymium-doped yttrium aluminium garnet ͑Nd:YAG͒ laser and a pulsed optical parametric oscillator ͑OPO͒ laser system were measured using a polydimethylsiloxane film and a single element high-frequency ultrasonic transducer. The advantages and limitations of the developed photoacoustic technique are discussed.

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“…In the UV region we can observe a strong band (around 200nm, not shown) which corresponds to the O→M charge transfer in the amorphous metal oxo domains in good agreement with previous works. 38 Moreover HyTa, HyNb and HyZr show a band centered at 280nm and at 376 for HyTi, this difference in the position of this band can be explained on the basis of the higher refractive index of titanium oxide. Hyperspectral Imaging consist into obtain the electromagnetic spectrum for every single pixel which compose a given image, in such a way a picture with selective and specific information about the distribution of the measured property is obtained.…”

Section: Optical Characterization Of Nayf 4 -Pdms Hybrid Nanocompositesmentioning

confidence: 92%

“…37,38 This field has emerged, in the last 40 years, as a really important science thanks to new discoveries and developments of new materials that have applications in fast communications, aerospace, sensing, lighting, computing and medical areas. 39 The main advantage that nanomaterials exhibit in contrast to classical photonic materials relies on the possibility to modulate their dimensionality and the anisotropy of their optical properties.…”

Section: Photonicsmentioning

confidence: 99%

Design of new nanomaterials for their use in catalysis and photochemistry

Gómez¹

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Incubation and ablation behavior of poly(dimethylsiloxane) for 266 nm irradiation

Cited by 48 publications

References 21 publications

Highly-compliant, microcable neuroelectrodes fabricated from thin-film gold and PDMS

Highly-compliant, microcable neuroelectrodes fabricated from thin-film gold and PDMS

Photoacoustic technique to measure beam profile of pulsed laser systems

Design of new nanomaterials for their use in catalysis and photochemistry

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