期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 23, 页码 14318-14322出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03224
关键词
formaldehyde; sensing; aqueous detection; silica nanoparticles; hybrid materials
资金
- Spanish Government [MAT2015-64139-C4-1-R]
- Generalitat Valencia [PROME-TEOII/2014/047]
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.
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