Air pollution is a serious environmental and health issue that necessitates accurate and timely air-quality monitoring to provide timely health warnings to affected demographics and as a regulatory tool for reduction of emission. Thus, a high-density sensor array was developed for detection and quantification of NO₂, SO₂, and O₃—three contributing air pollutants used for monitoring Air Quality Index (AQI). The gas sensor array operates on the principle of chemiresistive gas sensing with light-tunable selectivity and sensitivity which was achieved by combining the chemical selectivity and photoactive property of macrocyclic compounds with the chemical and electrical sensitivity of semiconducting single-walled carbon nanotubes (SWNTs). More specifically, sensing materials comprising hybrid nanostructures of SWNTs functionalized with either a metallophthalocyanine (MPc) derivative or a metalloporphyrin (MPor) derivative were formulated into printable inks. Each sensor in the array was fabricated by ink-jet printing of sensing materials onto interdigitated platinum electrodes. The sensor array demonstrated tunable sensitivity (in the range of sub-ppm to tens of ppm) to NO₂, SO₂, and O₃ under different combinations of illumination conditions and specific sensing materials.

空气污染是一个严重的环境和健康问题，需要准确，及时的空气质量监测，以向受影响的人口提供及时的健康警告，并作为减少排放的监管工具。因此，开发了用于检测和定量NO ₂，SO ₂和O ₃的高密度传感器阵列。—三种用于监测空气质量指数（AQI）的空气污染物。气体传感器阵列基于化学电阻式气体传感原理，具有光可调的选择性和灵敏度，这是通过将大环化合物的化学选择性和光活性与半导电单壁碳纳米管（SWNTs）的化学和电学灵敏度相结合而实现的。更具体地，将包含用金属酞菁（MPc）衍生物或金属卟啉（MPor）衍生物官能化的SWNT的杂化纳米结构的感测材料配制到可印刷油墨中。阵列中的每个传感器都是通过将传感材料喷墨印刷到叉指式铂电极上而制成的。传感器阵列显示出对NO可调的灵敏度（在亚ppm至数十ppm范围内）₂，SO ₂和O ₃在光照条件和特定传感材料的不同组合下。