Generally, the formaldehyde content of newly decorated houses will exceed the standard by more than six times, and the formaldehyde release period will last for 3–15 years. The residual formaldehyde after decoration will gradually be released into the surrounding environment.
In addition, the paint and coatings used in interior decoration also contain a lot of formaldehyde. For example, the main component of most adhesives used in artificial panels and furniture is formaldehyde. For ordinary families, indoor formaldehyde pollution mainly comes from indoor decoration. The improvement of the practical performance of formaldehyde sensors has great significance for improving indoor living environments.įormaldehyde has penetrated all aspects of human production and life as a common VOC, which plays a significant role in the chemical industry, textile industry, anti-corrosion, and even cosmetics. At present, researchers are trying to improve the sensitive material or use humidity compensation methods to optimize the gaseous formaldehyde sensor. However, the sensing performance of the sensor will be greatly reduced in a humid environment due to the sensitive coating on the gaseous formaldehyde sensor, which is mostly a hydrophilic polymer. Moreover, almost all polymer nanocomposite sensors have better sensitivity than single polymer sensors.
Almost all of these sensors can detect formaldehyde at ppb levels under laboratory conditions. They can be fabricated with a single polymer, molecularly imprinted polymers (MIP), polymer/metal-oxide composites, different polymers, polymer/biomass material composites, polymer/carbon material composites, and polymer composites with other materials. Polymer-related formaldehyde sensors can be very versatile.
Compared with the formaldehyde sensors based on small molecules, the polymer-based sensor has higher selectivity but lower sensitivity because the polymer-based sensor can realize the specific detection of formaldehyde through a specific chemical reaction. Among them, the gas sensor is especially suitable for common gaseous formaldehyde detection with the fastest response speed and the highest sensitivity. At present, spectrophotometry, gas chromatography, liquid chromatography, and other methods have been proposed for formaldehyde detection.
Formaldehyde has been regarded as a common indoor pollutant and does great harm to human health, which has caused the relevant departments to pay attention to its accurate detection.
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