高灵敏度二维光子晶体水凝胶Cu^2+传感器

Highly Sensitive Two-dimensional Photonic Crystal Hydrogel Cu^2+ Sensor

以聚苯乙烯二维光子晶体阵列为模板,戊二醛为交联剂,制备了聚乙烯醇二维光子晶体水凝胶(PVA 2DPCH),再以巯基乙酸为酯化剂,通过聚乙烯醇(PVA)的巯基化改性,得到巯基化聚乙烯醇二维光子晶体水凝胶(PVA-SH 2DPCH).利用德拜环法,研究了PVA-SH 2DPCH对Cu^2+的响应行为.结果表明,PVA-SH 2DPCH对Cu^2+具有超灵敏响应,在Cu^2+溶液中,凝胶收缩,其德拜环直径(D)随Cu^2+浓度的增大而增大,当Cu^2+浓度由0增加至10^−15 mol/L时,其德拜环直径即可增加0.45 cm,当浓度继续增大到10^−7 mol/L时,其德拜环直径(ΔD)可增加0.85 cm.当Cu^2+浓度在10^−15~10^−7 mol/L范围内时,PVA-SH 2DPCH的德拜环直径变化(ΔD)与Cu^2+浓度(c)呈线性关系,其线性回归方程为ΔD=1.195+0.0493×logc,(ΔD,cm;c,mol/L),R^2=0.99899.以制备的PVA-SH 2DPCH为Cu^2+传感器,利用德拜环法表征溶液中Cu^2+的浓度,方法简单快速兼具无标记、可视化检测的特点,为现场实时检测Cu^2+提供了可能.

Two-dimensional poly(vinyl alcohol)hydrogel(PVA 2DPCH)was prepared by using twodimensional photonic crystal array of polystyrene as template and glutaraldehyde as cross-linking agent.Then the mercaptopolyvinyl alcohol two-dimensional photonic crystal hydrogel(PVA-SH 2DPCH)was obtained through thiolization modification of poly(vinyl alcohol)(PVA),with mercaptoacetic acid as esterifying agent.The response behavior of PVA-SH 2DPCH to Cu^2+ was studied with the Debye ring method.The results showed that PVA-SH 2DPCH had a high-sensitive response to Cu^2+.The gel shrunk in Cu^2+ solution,and its Debye ring diameter(D)increased with increasing concentration of Cu^2+.When the concentration of Cu^2+ increased from 0 to 10^−15 mol/L,its Debye ring diameter increased by 0.45 cm;when the concentration continued to 10^−7 mol/L,its Debye ring diameter(ΔD)increased by 0.85 cm.To conclude,when the concentration of Cu^2+ is in the range of 10^−15−10^−7 mol/L,the Debye ring diameter change(ΔD)of PVA-SH 2DPCH has a linear relationship with the concentration of Cu^2+(c),and the linear regression equation isΔD=1.195+0.0493×logc,(ΔD(cm),c(mol/L)),R^2=0.99899.With the prepared PVA-SH 2DPCH as a Cu^2+ sensor,and the Debye ring method is adopted to characterize the concentration of Cu^2+in the solution.Featured by marker-free and visible detection,the Debye ring method is simple but highly efficient,which provides the possibility for real-time detection of Cu^2+ in the field.