M. Li, Y. Song, and co-workers develop a hydrophilic–hydrophobic patterned molecularly imprinted (MIP) photonic crystal (PC) sensor for colorimetric detection. This device can enrich the target molecules from the diluted solution to the hydrophilic MIP-PC sensor during evap oration, and provides a new strategy to design highly sensitive colorimetric sensors for trace detection, as well as to easily regulate the detection range by varying the size of the sensor area. 

Small, 2015