物理化学学报 >> 2016, Vol. 32 >> Issue (12): 2976-2982.doi: 10.3866/PKU.WHXB201610171

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镉离子响应性凝胶光子晶体传感膜的构建

张晓栋,秦立彦,陈明清,刘士荣*()   

  • 收稿日期:2016-07-27 发布日期:2016-11-30
  • 通讯作者: 刘士荣 E-mail:liushirong1961@163.com
  • 基金资助:
    国家自然科学基金(51173072)

Fabrication of a Responsive Hydrogel Photonic Crystal Sensing Film for Cadmium Ions

Xiao-Dong ZHANG,Li-Yan QIN,Ming-Qing CHEN,Shi-Rong LIU*()   

  • Received:2016-07-27 Published:2016-11-30
  • Contact: Shi-Rong LIU E-mail:liushirong1961@163.com
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(51173072)

摘要:

将光子晶体与响应性水凝胶结合,采用“三明治”填充方法,以聚苯乙烯(PS)胶体晶体为模板,丙烯酰胺和烯丙基硫脲为单体制备得到一种对镉离子具有特异响应性的凝胶光子晶体传感膜,并对其进行了形貌表征和响应性研究。结果表明,该传感膜具有排列整齐的反蛋白石结构,可对不同浓度的Cd2+输出不同的光学信号。随着Cd2+浓度的增大,传感膜的Bragg衍射峰发生蓝移,并伴随有显著的颜色变化。在最优配比,适宜pH和离子强度条件下,衍射峰的最大位移值可达51.1 nm。在研究过程中发现其他干扰金属离子的存在不会影响传感膜对Cd2+的特异性响应,并且表现出了较快的响应速度。在多次循环实验中传感膜由于具备高度交联结构而表现出了良好的机械性和化学稳定性。该传感膜的构建为Cd2+的快速高效及裸眼可视检测提供了可能性。

关键词: 光子晶体, 水凝胶, 烯丙基硫脲, 镉离子, 蓝移, 裸眼

Abstract:

A hydrogel photonic crystal (HPC) film was fabricated for the specific detection of cadmium ions. This sensing film was based on a combination of a photonic crystal and a responsive hydrogel. It was fabricated using a "sandwich" filling method with a polystyrene (PS) colloidal crystal template, acrylamide (AM) and 1-allyl-2-thiourea (ATU) monomers. The morphology and responsivity were investigated in detail. The sensing film had an ordered, inverse opal structure and produced an optical signal in response to changes in the concentration of Cd2+. The Bragg diffraction peaks from the sensing film were blue shifted with increasing concentrations of Cd2+, and the color changes were visible to the naked eye. When the optimum ratio of monomers, suitable pH and ionic strength were used, the maximum displacement of the diffraction peak reached 51.1 nm. The presence of other interfering metal ions did not affect the specific response to Cd2+, and the sensing film exhibited a fast response rate. The cyclic tests showed that the sensing films had suitable mechanical and chemical stability because of their highly cross-linked structure. Importantly, these sensing films were allowed for high efficiency and rapid detection of Cd2+ by a color change that was visible to the naked eye.

Key words: Photonic crystal, Hydrogel, 1-Allyl-2-thiourea, Cadmium ion, Blue shift, Naked eye

MSC2000: 

  • O648