An efficient and sensitive fluorescent pH sensor based on amino functional metal–organic frameworks in aqueous environment

In this work, an amino group functionalized MOF (Al-MIL-101-NH₂), which shows strong blue luminescence, is used as pH sensor. Due to the protonated amino group, the fluorescence intensity of Al-MIL-101-NH₂almost increases with increasing pH and gives a good linear relationship (R²= 0.99688) with the pH value.