Structural-mechanical AFM study of inhomogeneous stiff nanocoating of soft polymer substrate

Flexible inorganic electronic devices (FIEDs) consisting of functional inorganic components on a soft polymer substrate have enabled many novel applications such as epidermal electronics and wearable electronics, which cannot be realized through conventional rigid electronics. The low thermal dissipation capacity of the soft polymer substrate of FIEDs demands proper thermal management to reduce the undesired thermal influences. The biointegrated applications of FIEDs pose even more stringent requirements on thermal management due to the sensitive nature of biological tissues to temperature. In this review, we take microscale inorganic light-emitting diodes (μ-ILEDs) as an example of functional components to summarize the recent advances on thermal management of FIEDs including thermal analysis, thermo-mechanical analysis and thermal designs of FIEDs with and without biological tissues. These results are very helpful to understand the underlying heat transfer mechanism and provide design guidelines to optimize FIEDs in practical applications.

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Flip-chip assembly on soft polymer substrate using ACP for integrating readout circuitry for modular expandable tactile sensor array

The 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. ◽

10.1109/sensor.2005.1497486 ◽

2005 ◽

Author(s):

Sun-Il Chang ◽

Hyung-Kew Lee ◽

Euisik Yoon

Keyword(s):

Sensor Array ◽

Flip Chip ◽

Tactile Sensor ◽

Polymer Substrate ◽

Tactile Sensor Array ◽

Flip Chip Assembly ◽

Soft Polymer

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Surface pattern formation on soft polymer substrate through photo-initiated graft polymerization

Polymers for Advanced Technologies ◽

10.1002/pat.4029 ◽

2017 ◽

Vol 28 (11) ◽

pp. 1510-1515 ◽

Cited By ~ 1

Author(s):

Tatsuo Aikawa ◽

Hiroaki Kudo ◽

Takeshi Kondo ◽

Makoto Yuasa

Keyword(s):

Pattern Formation ◽

Graft Polymerization ◽

Polymer Substrate ◽

Surface Pattern ◽

Soft Polymer

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Soft, Wirelessly Powered Humidity Sensor Based on SnO2 Nanowires for Wireless/Wearable Sensor Application

Materials ◽

10.3390/ma13092176 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2176 ◽

Cited By ~ 1

Author(s):

Gunchul Shin

Keyword(s):

Electrical Properties ◽

Humidity Sensor ◽

Light Emitting Diode ◽

Chemical Vapor ◽

Polymer Substrate ◽

Light Emitting ◽

Sno2 Nanowires ◽

Transfer Method ◽

Soft Polymer ◽

Response To Water

Humidity, along with temperature, is one of the most important environmental variables in people’s lives. The control of humidity is an important matter that is related to material properties and stability in various industries, as well as basic living. In order to detect humidity, changes in the physical, chemical, and electrical properties of materials related to humidity are used, and studies using various methods are conducted. In this study, a field-effect transistor (FET) device was fabricated on a soft polymer substrate with SnO2 nanowires (NWs), whose electrical properties change in response to water molecules. The SnO2 NWs, synthesized by chemical vapor deposition (CVD), were transferred onto a polymer substrate, using a sliding transfer method. The NW FET device, which was connected to an aluminum (Al)-based radio frequency (RF) receiving antenna, was wirelessly operated as a humidity sensor, based on the change in electrical properties of SnO2 NWs according to the relative humidity (RH). It was configured with a wireless antenna and light emitting diode (LED) indicator to implement a soft wirelessly powered humidity sensor that senses high RH and is expected to be used as a wearable electronic/sensor in the future.

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Folding instabilities and cracking of thin coatings on a soft polymer substrate as a model of the oceanic crust

Geofísica Internacional ◽

10.22201/igeof.00167169p.2001.40.2.371 ◽

2001 ◽

Vol 40 (2) ◽

pp. 87-95

Author(s):

A. L. Volynskii ◽

S. L. Bazhenov

Keyword(s):

Oceanic Crust ◽

Polymer Substrate ◽

Thin Coatings ◽

Soft Polymer

Se presentan resultados experimentales sobre fractura tensional de capas delgadas metálicas sobre una base sintética. La geometría de las fracturas presenta analogías con el relieve del fondo marino en regiones de extensión.

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Silver nano platelet films on soft micro grating surface

Microelectronics International ◽

10.1108/mi-07-2018-0044 ◽

2019 ◽

Vol 36 (1) ◽

pp. 1-7

Author(s):

Murtuza Mehdi ◽

Alidad Chandio ◽

Maaz Akhtar ◽

Zaibullah Khan ◽

Ahsan Zaman ◽

...

Keyword(s):

Applied Load ◽

Mechanical Performance ◽

Substrate Surface ◽

Ambient Air ◽

Polymer Substrate ◽

Content Type ◽

Thin Aluminum ◽

Micron Size ◽

Device Applications ◽

Soft Polymer

Purpose Polymer substrates with micron size roughness features have been found to play an important role in the mechanical performance of thin functional films which are used extensively in stretchable and flexible micro electromechanical systems. The purpose of this study is to report the stretchability and flexibility limits of micro size silver nano platelet films on a soft polymer substrate having two different orientations of micro grating with respect to the applied load. Design/methodology/approach Parallel and perpendicular micro gratings on the surface of a soft polymer substrate polydimethylsiloxane were patterned using a carefully machined master aluminum block and thin aluminum foils. Silver nano platelet-based films were rod coated on the substrate surface containing the micro gratings. These films were dried in ambient air and were tested for their stretchability and flexibility limits using homemade tools. Finite element modeling has also been performed and was found to support the experimental observations. Findings Experiments indicate that stretchability of silver nano platelet-based thin films tends to increase when the grating orientation remains parallel to the axis of the applied load, while its flexibility improves when the orientation becomes perpendicular to the loading axis. Originality/value The effect of grating orientation with respect to the applied load was investigated. The experiments show that micro grating roughness features are capable of enhancing the mechanical performance of nano platelet-based silver films on a soft polymer substrate and can be used in various stretchable and flexible micro electro mechanical device applications.

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