Polymer diffraction gratings on stimuli-responsive hydrogel surfaces: Soft-lithographic fabrication and optical sensing properties
Polymer diffraction gratings on stimuli-responsive hydrogel surfaces: Soft-lithographic fabrication and optical sensing properties
复制标题
刺激响应水凝胶表面上的聚合物衍射光栅：软光刻制造和光学传感特性
DOI：
10.1016/j.snb.2010.03.052
复制
发表时间：
2010-06-03
影响因子：
8.4
通讯作者：
Wang, Xiaogong
中科院分区：
文献类型：
--
作者：
Ye, Gang;Wang, Xiaogong
在这项工作中，发展了一种软光刻接触印刷方法，在刺激响应型水凝胶表面制备聚合物衍射栅。在制备过程中，以表面带有表面浮雕光栅(SRGs)的偶氮聚合物薄膜为母材，用干涉Ar+激光照射BP-AZ-CA固体薄膜进行刻蚀。将聚二甲基硅氧烷(PDMS)预聚体与母材复型成型并适当固化，制备了弹性印章。采用软光刻接触印刷技术在pH敏感水凝胶板表面制备了一维(ID)和二维(2D)光栅。结果表明，水凝胶在缓冲溶液中的溶胀可以通过光栅衍射参数的变化灵敏地反映出来。缓冲溶液的pH值对衍射参数变化的速度和程度有很大影响。通过凝胶体积对外界刺激的响应，衍射栅可以光学地感知溶液pH的变化，这可以扩展到检测溶液中的离子强度和其他分析物。这种转导机制对于光学检测外部刺激或分子识别事件是有用的。该灵敏光栅还可用作智能滤光片等光学器件。(C)2010爱思唯尔B.V.保留所有权利。
In this work, a soft-lithographic contact printing approach was developed to fabricate polymer diffraction gratings on stimuli-responsive hydrogel surfaces. For the fabrication, azo polymer films with surface-relief-gratings (SRGs) on surfaces were used as masters, which were inscribed by irradiating solid films of BP-AZ-CA with interfering Ar+ laser beams. Elastomeric stamps were prepared by replica molding of poly(dimethylsiloxane) (PDMS) prepolymer against the masters and curing properly. One-dimensional (ID) and two-dimensional (2D) gratings were fabricated on the surfaces of pH-sensitive hydrogel plates through soft-lithographic contact printing. Results show that the swellings of the hydrogel in buffer solutions are sensitively reflected by the variation of the gratings' diffraction parameter. The pH of the buffer solutions shows a significant influence on the rate and degree of the diffraction parameter variation. Through the hydrogel volume change in response to external stimuli, the diffraction gratings can optically sense the variation of solution pH, which can be extended to sense the ionic strength and other analytes in solutions. Such a transduction mechanism is useful for optically detecting the external stimuli or molecular recognition events. The sensitive grating can also be used as the smart optical filters and other optical devices. (C) 2010 Elsevier B.V. All rights reserved.