Highly Sensitive Colorimetric Sensing for Cu2+ by Inverse Opals of Photonic Crystal Hydrogels†

doi:10.7503/cjcu20170519

Abstract

Abstract:

Inverse opals of photonic crystal hydrogels(PCHs) composed of acrylamide(AM) and N-vinyl imidazole(NVI) copolymers were fabricated for the specific detection of Cu²⁺. A “sandwich” structure was used to control the precursor infiltration in order to endow PCHs with highly ordered three-dimensional interconnected macroporous structure. The acquired PCHs produced the characteristic Bragg diffraction peak when immersed into Cu²⁺ buffers, and exhibited a rapid response. With the increase of concentration of Cu²⁺ from 0 mol/L to 10^-4 mol/L, Bragg diffraction peak of PCHs blueshifted 66 nm and the color change was visible to the naked eyes(from brown to kelly green). Furthermore, PCHs exhibited efficient recognition to Cu²⁺ in the multicomponent metal ion solution. Such a specific recognition, rapid response and signal self-reporting of PCHs to Cu²⁺ provide great potential for the real-time monitor of Cu²⁺.

Key words: “Sandwich”, structure, Inverse opals, Photonic crystals, Hydrogels, Detection of Cu²⁺

CLC Number:

O648.1

TrendMD:

LIU Shirong, QIN Liyan, ZHANG Xiaodong, CHEN Mingqing. Highly Sensitive Colorimetric Sensing for Cu²⁺ by Inverse Opals of Photonic Crystal Hydrogels^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 1993.

Figures/Tables 6

Fig.1 Schematic illustration of the procedure for the preparation of PCHs

Fig.2 SEM images of PS colloidal crystals(A), opals of PCHs(B), inverse opals of PCHs(C) and photograph of inverse opals of PCHs(D)

Fig.3 Reflection spectra of PCHs upon soaking in Cu2+ buffers(A), the linear relationship between the Bragg diffraction peak shift values(Δλ) and logarithm of Cu2+ concentration(lgcCu2+)(B), the corresponding photographs of PCHs(C) and sensing mechanism of PCHs to Cu2+(D)

Fig.4 Reflection spectra(A) and corresponding diffraction peak shift values(Δλ) of PCHs in 10-4 mol/L Cu2+ solution with different pH(B)

Fig.5 Selectivity of PCHs for different metal ions(A) and the changes of Bragg diffraction peak position upon soaking in multicomponent metal ion solution(B)

Fig.6 Kinetic response(A) and recoverability(B) of the PCHs

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Highly Sensitive Colorimetric Sensing for Cu²⁺ by Inverse Opals of Photonic Crystal Hydrogels^†

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