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Abstract: Free-standing molecularly imprinted photonic hydrogels(MIPHs) that peeled from the supporters were prepared using the colloidal crystal template method assisted by "sandwich structure". MIPHs were fabricated by UV polymerization with L-Tryptophan(L-Trp) as template molecule, acrylamide(AM) as functional monomer, N,N'-methylene bisacrylamide(BIS) as crosslinking agent. MIPHs were characterized by highly ordered three-dimensional interconnected macroporous structure. MIPHs showed rapid response property when immersed into L-Trp buffers. The Bragg diffraction peak of MIPHs redshifted 83 nm as the concentration of L-Trp increased from 10-10 mol/L to 10-5 mol/L, and the color changes could be visible by the naked eyes. Moreover, MIPHs showed only a slight shift in the Bragg diffraction peak in solutions of L-Tyr or L-Phe, which indicated that MIPHs possessed a certain selectivity. High selectivety, rapid response and signal self-reporting of MIPHs might provide great convenience for the application in the real-world environments.
Template and target information: L-tryptophan, L-trp
Author keywords: sandwich structure, inverse opal, Photonic crystal, molecularly imprinted, L-tryptophan