Development of formaldehyde sensing element using porous glass impregnated with Schiff's reagent
2007; Elsevier BV; Volume: 129; Issue: 2 Linguagem: Inglês
10.1016/j.snb.2007.09.002
ISSN1873-3077
AutoresYasuko Yamada Maruo, Jiro Nakamura, Masahiro Uchiyama, Masanori Higuchi, Katsuyuki Izumi,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoWe developed a sensor element for detecting formaldehyde. The sensor element was made of a porous glass impregnated with both a Schiff's reagent and an acid. The sensor element changed its color from yellow to violet after exposure to formaldehyde, and an absorption peak appeared at a wavelength of 570 or 580 nm. There was a quasi-linear relationship between the 570 and 580 nm absorbance of the sensor element after exposure to formaldehyde and a logarithm of the exposed formaldehyde concentration. Also, the sensor element worked as a reversible type, not as an accumulate type, and the absorbance at 570 or 580 nm of a once exposed sensor element decreased when it was exposed to a less concentrated formaldehyde atmosphere. These results indicate that our developed sensor element is reversible and suitable for the detection of a wide formaldehyde concentration range, for example from 20 ppm to 10 ppb.
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