High selective gas sensors based on surface modified polymer transistor

Gas sensors based on organic field effect transistors have attracted great attentions and achieved much progress because of their inherent merits such as low-cost, room operating temperature, good portability and flexibility. However, high sensitivity and good selectivity are still challenging issues blocking their further development. Herein, we demonstrate a promising strategy for fabricating high selective organic gas sensors through introducing surface modification. Modified substrate with different self-assembling monolayers (SAMs), the sensing properties of polymer OFET gas sensors are varied with terminal group attached on the SAM. The bare device shows significant sensitive to NH3, while it becomes much more sensitive to NO2 if a fluorine substituent SAM adopted. The NH2-terminal SAM and CH3-terminal SAM bring moderate sensitivity to gases like NH3 and NO2. Those various sensitivity and device parameter evolution are promising to generate a patterning recognition for different gases, which may provide a potential promising approach for improving selectivity of organic gas sensors.