Chromogenic Detection of Aqueous Formaldehyde Using Functionalized Silica Nanoparticles
Chromogenic Detection of Aqueous Formaldehyde Using Functionalized Silica Nanoparticles
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DOI：
10.1021/acsami.6b03224
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发表时间：
2016-06-15
影响因子：
9.5
通讯作者：
Sancenon, Felix
中科院分区：
文献类型：
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作者：
El Sayed, Sameh;Pascual, Lluis;Sancenon, Felix
用硫醇反应单元和大体积极性多胺官能化的二氧化硅纳米颗粒用于甲醛的选择性比色检测。纳米颗粒表面中的硫醇基团与方酸染料的反应导致发色团的π-共辄的损失，以及随后的溶液漂白。然而，当甲醛存在于悬浮液中时，硫醇-方酸反应被抑制并且观察到显色响应。只有当硫醇和多胺基团被锚定到二氧化硅表面时，才观察到对甲醛的选择性响应。观察到的选择性反应归因于这样的事实，即庞大的聚胺产生周围的硫醇，这是只能与小的和极性的甲醛，但不与其他醛反应的高度极性的环境。传感纳米颗粒显示出对水中甲醛的检测限（LOD）为36 ppb。
Silica nanoparticles functionalized with thiol reactive units and bulky polar polyamines were used for the selective colorimetric detection of formaldehyde. The reaction of thiols groups in the nanoparticles surface with a squaraine dye resulted in loss of the pi-conjugation of the chromophores, and the subsequent bleaching of the solution. However, when formaldehyde was present in the suspension, the thiol-squaraine reaction was inhibited and a chromogenic response was observed. A selective response to formaldehyde was observed only when the thiol and polyamine groups were anchored to the silica surface. The observed selective response was ascribed to the fact that bulky polyamines generate a highly polar environment around thiols, which were only able to react with the small and polar formaldehyde, but not with other aldehydes. The sensing nanoparticles showed a limit of detection (LOD) for formaldehyde of 36 ppb in water.