Formaldehyde is one of the toxic volatile organic compounds and is known to be a carcinogen and a major cause of sick building syndrome. In this study, polystyrene (PS)/polyaniline (PANI) core-shell type microparticles with narrow size distributions were prepared by applying the Swelling-Diffusion-Interfacial Polymerization Method (SDIPM). The PANI shell was uniformly coated on the PS core and the PANI loading efficiency estimated by gravimetric reaction yield analysis was 98.69%. A formaldehyde sensor device was fabricated by a solution casting of the PS/PANI core-shell type microparticles on the Interdigitated Electrodes (IDEs). The PS/PANI coated IDE sensor showed an excellent sensitivity for formaldehyde in range of 1–50 ppm at room temperature as follows: −9.9% of response for 1 ppm and −37.6% of response for 50 ppm. In addition, it showed a clear reversibility indicating that the sensor could be reused at least 3 times for the detection of formaldehyde.

甲醛是有毒的挥发性有机化合物之一，已知是一种致癌物质，也是造成建筑物综合症的主要原因。在这项研究中，聚苯乙烯（PS）/聚苯胺（PANI）核壳型微粒具有狭窄的尺寸分布是通过应用溶胀-扩散-界面聚合法（SDIPM）制备的。将PANI壳均匀地涂覆在PS核上，并且通过重量反应产率分析估计的PANI加载效率为98.69％。通过将PS / PANI核壳型微粒溶液浇铸在叉指电极（IDE）上来制造甲醛传感器设备。涂有PS / PANI的IDE传感器在室温下对甲醛的灵敏度为1–50 ppm，如下所示：1 ppm时响应为-9.9％，50 ppm时响应为-37.6％。此外，