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dc.contributor.authorChen, Jem-Kunen_US
dc.contributor.authorWang, Jing-Hongen_US
dc.contributor.authorCheng, Chih-Chiaen_US
dc.contributor.authorChang, Jia-Yawen_US
dc.date.accessioned2014-12-08T15:30:14Z-
dc.date.available2014-12-08T15:30:14Z-
dc.date.issued2013-04-24en_US
dc.identifier.issn1944-8244en_US
dc.identifier.urihttp://dx.doi.org/10.1021/am4010072en_US
dc.identifier.urihttp://hdl.handle.net/11536/21663-
dc.description.abstractIn this study we used atom transfer radical polymerization to graft poly(N-isopropylacrylamide) (PNI-PAAm) onto flat Si substrates. We then applied very large-scale integration and reactive ion etching sequentially to generate 200-nm-scale hole arrays of tethered PNIPAAm as two-dimensional periodic concave gratings (2DPCGs) on the Si surfaces. The hole array structures of tethered PNIPAAm could be created and erased reversibly at 25 and 40 degrees C, respectively, leading to significant. changes in the effective refractive index (n(eff)). The values of neff of the 2DPCGs were related to the depth of their holes generated after etching for various times, resulting in a color change from blue to red that could be observed by the naked eye at incident angles of 10-20 degrees. Moreover, we used effective-medium theory to calculate the filling factors of air inside the 2DPCGs to verify the structural changes of the tethered PNIPAAm. Such designed 2DPCGs of thermorespective hydrogel films have potential applications in temperature-responsive optical devices [e.g., as antireflection structured surfaces (ARSs)] that operate at both visible and near-infrared wavelengths.en_US
dc.language.isoen_USen_US
dc.subjectPNIPAAm brushen_US
dc.subjecttwo-dimensional periodic gratingen_US
dc.subjectrefractive indexen_US
dc.titleReversibly Thermoswitchable Two-Dimensional Periodic Gratings Prepared from Tethered Poly(N-isopropylacrylamide) on Silicon Surfacesen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/am4010072en_US
dc.identifier.journalACS APPLIED MATERIALS & INTERFACESen_US
dc.citation.volume5en_US
dc.citation.issue8en_US
dc.citation.spage2959en_US
dc.citation.epage2966en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.identifier.wosnumberWOS:000318205000021-
dc.citation.woscount9-
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