Scalable Optical Nose Realized with a Chemiresistively Modulated Light‐Emitter Array

Biological olfaction relies on a large number of receptors that function as sensors to detect gaseous molecules. It is challenging to realize artificial olfactory systems that contain similarly large numbers of sensory materials. It is shown that combinatorial materials processing with vapor deposition can be used to fabricate large arrays of distinct chemiresistive sensing materials. By combining these with light‐emitting diodes, an array of chemiresistively‐modulated light‐emitting diodes, or ChemLEDs, that permit a simultaneous optical read‐out in response to an analyte is obtained. The optical nose uses a common voltage source and ground for all sensing elements and thus eliminates the need for complex wiring of individual sensors. This optical nose contains one hundred ChemLEDs and generates unique light patterns in response to gases and their mixtures. Optical pattern recognition methods enable the quantitative prediction of the corresponding concentrations and compositions, thereby paving the way for massively parallel artificial olfactory systems. ChemLEDs open the possibility to explore demanding gas sensing applications, including in environmental, food quality monitoring, and potentially diagnostic settings. An optical nose that integrates a large array of chemiresistive sensors with light‐emitting diodes (ChemLEDs) is introduced. Each metal‐oxide sensor, grown combinatorially, modulates the intensity of an LED in response to the gas mixture. The array of ChemLEDs displays a unique light pattern for various gas mixtures and permits the quantitative analysis of composition and analyte concentration using image analysis tools.