Chromogenic Detection of Aqueous Formaldehyde Using Functionalized Silica Nanoparticles

被引:72
作者
El Sayed, Sameh [1 ,2 ,3 ,4 ]
Pascual, Lluis [1 ,2 ,3 ]
Licchelli, Maurizio [4 ]
Martinez-Manez, Ramon [1 ,2 ,3 ]
Gil, Salvador [1 ,3 ,5 ]
Costero, Ana M. [1 ,3 ,5 ]
Sancenon, Felix [1 ,2 ,3 ]
机构
[1] Univ Valencia, Univ Politecn Valencia, Unidad Mixta, Inst Interuniv Invest Reconocimiento Mol & Desarr, Valencia, Spain
[2] Univ Politecn Valencia, Dept Quim, Camino Vera S-N, E-46022 Valencia, Spain
[3] CIBER Bioingn Biomat & Nanomed CIBER BBN, Valencia, Spain
[4] Univ Pavia, Dipartimento Chim, Via Taramelli 12, I-27100 Pavia, Italy
[5] Univ Valencia, Dept Quim Organ, Dr Moliner 50, E-46100 Valencia, Spain
关键词
formaldehyde; sensing; aqueous detection; silica nanoparticles; hybrid materials; FLUORESCENT-PROBE; ACETALDEHYDE; SENSORS; MORPHOLOGY; ALDEHYDES; ETHANOL;
D O I
10.1021/acsami.6b03224
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:14318 / 14322
页数:5
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