DataVXACS Applied Materials & InterfacesPaper
journal article·2016-06-15Open access

Chromogenic Detection of Aqueous Formaldehyde Using Functionalized Silica Nanoparticles

Sameh El Sayed, Lluı́s Pascual, Maurizio Licchelli, Ramón Martínez-Máñez, Salvador Gil, Ana M. Costero, Félix Sancenón

ACS Applied Materials & Interfaces· Volume 8· Issue 23
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Source abstract

Abstract

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 π-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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Research context

Nanomaterials

OpenAlex topics: Advanced Chemical Sensor Technologies · Gas Sensing Nanomaterials and Sensors · Electrochemical sensors and biosensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universidad Politécnica de Valencia-Universidad de Valencia, Valencia, Spain

Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain

CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN)

Dipartimento di Chimica, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy

Departamento de Química Orgánica, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain

Funding

Generalitat Valenciana · Ministerio de Economía y Competitividad · Universitat Politècnica de València

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