Preparation and Chemical Sense Character of Two-dimensional Colloidal Crystal Heterostructures†

doi:10.7503/cjcu20150274

Abstract

Abstract:

Polystyrene(PS) and poly(methyl methacrylate)(PMMA) suspensions with different particle sizes and refractive index were prepared. A successive air/water interface self-assembly method was developed to fabricate two-dimensional colloidal crystal heterostructures(2D-CCHs) array. Furthermore, 2-hydroxyethyl methacrylate-acrylic acid(HEMA-AA) 2D-CCHs inverse opals with high mass transfer efficiencies were obtained after removing the opal templates. The prepared heterostructures are highly ordered two-dimensional structures proved by scanning electron microscopy images(SEM). Debye diffraction rings, reflectance spectra and structural colors suggested that the optical properties of 2D-CCHs are attributed to overlay of the individual diffraction of single 2D colloidal crystal. With the pH value decreased from 7 to 3, Debye diffraction rings’ diameters of double-layers 2D-CCHs inverse opals both shrank nearly 80 nm. The response of 2D-CCHs to pH indicates their preliminary application in chemical sensors.

Key words: Colloidal crystal, Heterostructure, Air/water interface self-assembly method, Polystyrene, Poly(methyl methacrylate)

CLC Number:

O631
O613.7

TrendMD:

QI Fenglian, XUE Min, XUE Fei, MENG Zihui, QIU Lili, XU Zhibin, LU Wei. Preparation and Chemical Sense Character of Two-dimensional Colloidal Crystal Heterostructures^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1612.

Figures/Tables 7

Scheme 1 The preparation of 2D colloidal crystal heterostructures(2D-CCHs) inverse opals

Fig.1 SEM images of 2D colloidal crystal arrays with different monodisperse particles(A) PS, size: 590 nm; (B) PS+NaCl, size: 640 nm; (C) PMMA, size: 710 nm.

Fig.2 Top-view SEM(A—C) and cross-sectional SEM(D—F) of 2D-CCHs with 590 nm PS(A,D), 590 nm PS-640 nm PS(B,E) and 590 nm PS-640 nm PS-710 nm PMMA(C,F)

Fig.3 Debye diffraction rings(A—C) and the structure color(D—F) of 2D-CCHS with 590 nm PS(A, D), 590 nm PS-640 nm PS(B, E) and 590 nm PS-640 nm PS-710 nm PMMA(C, F)

Fig.4 Change of Debye diffraction rings(A) and structure color(B) of double-layers 2D-CCHs inverse opals response to pH

Fig.5 Top-view SEM(A—C) and cross-sectional view SEM(D—F) of single-layer(A, D), double-layers(B, E) and triple-layers(C, F) 2D-CCHs inverse opals

Fig.6 Reflectance spectrum of triple-layers 2D-CCHs inverse opals

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