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Micromachines 2017, 8(1), 5; doi:10.3390/mi8010005

Plasma Polymerization of SnOxCy Organic-Like Films and Grafted PNIPAAm Composite Hydrogel with Nanogold Particles for Promotion of Thermal Resistive Properties

Department of Materials Engineering, Tatung University, Taipei 104, Taiwan
Institute of Biomedical Engineering, National Taiwan University, Taipei 106, Taiwan
Bachelor Program for Design and Materials for Medical Equipment and Devices, Da Yeh University, Changhua 515, Taiwan
Author to whom correspondence should be addressed.
Academic Editors: Gerald A. Urban, Joost Lötters and Nam-Trung Nguyen
Received: 25 September 2016 / Revised: 3 November 2016 / Accepted: 20 December 2016 / Published: 26 December 2016
View Full-Text   |   Download PDF [3509 KB, uploaded 26 December 2016]   |  


In this study, a new type of temperature sensor device was developed. The circular electrode of the thermally sensitive sensor was modified with tetramethyltin (TMT) and O2 plasma to form a thin SnOxCy conductive layer on the electrode surface. The nano-Au particles (AuNPs) were subjected to O2 plasma pretreatment to form peroxide groups on the surface. The thermally sensitive sensor made by mixing the treated AuNPs with N-isopropylacrylamide (NIPAAm) solution and then applying UV-induced grafting polymerization of the NIPAAm-containing solution onto the electrode substrate. The composite hydrogels on the electrode introduce thermo-sensitive polymeric surface films for temperature sensing. Using the ambient environment resistance test to measure the resistance, the lower critical solution temperature (LCST) of AuNPs mixed with NIPAAm hydrogel was found to be 32 °C. In common metallic materials, the resistance increased during environmental temperature enhancement. In this study, at ambient temperatures higher than the LCST, the electrode resistance decreases linearly due to the shrinkage structure with AuNPs contacting the circuit electrode. View Full-Text
Keywords: AuNPs; NIPAAm hydrogel; plasma treatment; UV grafting AuNPs; NIPAAm hydrogel; plasma treatment; UV grafting

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chou, C.-Y.; Chen, K.-S.; Lin, W.-L.; Ye, Y.-C.; Liao, S.-C. Plasma Polymerization of SnOxCy Organic-Like Films and Grafted PNIPAAm Composite Hydrogel with Nanogold Particles for Promotion of Thermal Resistive Properties. Micromachines 2017, 8, 5.

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