RT Journal Article
T1 Integrated 3D Hydrogel Waveguide Out-Coupler by Step-and-Repeat Thermal Nanoimprint Lithography: A Promising Sensor Device for Water and pH: 												A promising sensor device for water and pH
A1 Francone, Achille
A1 Kehoe, Timothy
A1 Obieta, Isabel
A1 Saez-Martinez, Virginia
A1 Bilbao, Leire
A1 Khokhar, Ali Z.
A1 Gadegaard, Nikolaj
A1 Delgado Simao, Claudia
A1 Kehagias, Nikolaos
A1 Sotomayor Torres, Clivia M.
AB Hydrogel materials offer many advantages for chemical and biological sensoring due to their response to a small change in their environment with a related change in volume. Several designs have been outlined in the literature in the specific field of hydrogel-based optical sensors, reporting a large number of steps for their fabrication. In this work we present a three-dimensional, hydrogel-based sensor the structure of which is fabricated in a single step using thermal nanoimprint lithography. The sensor is based on a waveguide with a grating readout section. A specific hydrogel formulation, based on a combination of PEGDMA (Poly(Ethylene Glycol DiMethAcrylate)), NIPAAm (N-IsoPropylAcrylAmide), and AA (Acrylic Acid), was developed. This stimulus-responsive hydrogel is sensitive to pH and to water. Moreover, the hydrogel has been modified to be suitable for fabrication by thermal nanoimprint lithography. Once stimulated, the hydrogel-based sensor changes its topography, which is characterised physically by AFM and SEM, and optically using a specific optical set-up.
SN 1424-3210
YR 2018
FD 2018-10
LA eng
NO Francone , A , Kehoe , T , Obieta , I , Saez-Martinez , V , Bilbao , L , Khokhar , A Z , Gadegaard , N , Delgado Simao , C , Kehagias , N & Sotomayor Torres , C M 2018 , ' Integrated 3D Hydrogel Waveguide Out-Coupler by Step-and-Repeat Thermal Nanoimprint Lithography: A Promising Sensor Device for Water and pH : A promising sensor device for water and pH ' , Sensors , vol. 18 , no. 10 , 3240 , pp. 3240 . https://doi.org/10.3390/s18103240
NO Publisher Copyright: © 2018 by the authors. Licensee MDPI, Basel, Switzerland.
DS TECNALIA Publications
RD 22 jul 2024