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[摘要]：Based on the combination of colloidal-crystal templating and a mol. imprinting technique, a sensor platform to efficiently detect atrazine in water was developed. The sensor is characterized by a 3-dimensional, ordered, interconnected macro-porous structure in which numerous nano-cavities derived from atrazine imprinting are distributed in the thin wall of the formed inverse polymer opal. Due to the special hierarchical porous structure, the molecularly-imprinted polymer opals (molecularly-imprinted photonic polymer, MIPP) allow rapid, ultra-sensitive detection of the target analyte. The interconnected macro-pores are favorable for rapid atrazine transport in polymer films; the inherent high affinity of nano-cavities distributed in thin polymer walls allows MIPP to recognize atrazine with high specificity. More importantly, atrazine recognition events of created nano-cavities can be directly transferred (label-free) into a readable optical signal through a change in Bragg diffraction of the ordered MIPP macro-pore array, thereby inducing color changes detectable to the naked eye. With this novel sensory system, direct, ultra-sensitive (as low as 10-8 ng/mL), rapid (<30 s), selective atrazine detection with a broad concn. range (10-16 to 10-6 M) in water is achieved without using label techniques and expensive instruments. |
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