Fabrication of Hierarchical Hemisphere Ag Substrate Using Transfer Imprinting with No Pressure Under Ambient Temperature†

doi:10.7503/cjcu20170340

Abstract

Abstract:

PS microsphere arrays with three kinds of particle sizes, which were used to make soft templates, were fabricated by self-assembling. Then, the polymethyl methacrylate(PMMA) hemispherical arrays were transferred from the soft template onto the substrate under ambient temperature with no pressure. Ag nanoparticles were formed by photo-reduction on the surface of hemispherical arrays, which performed surface enhanced Raman scattering. The key to this successful transfer imprinting is that the low surface energy of soft template and the hydrogen bond of the interface between PMMA and the substrate.

Key words: Transfer imprinting, Ambient temperature and no pressure, Silver substrate, Hierarchical structure

CLC Number:

O614.1

TrendMD:

SHI Gang, BAI Huiyu, WANG Likui, SANG Xinxin, YANG Jingguo, NI Caihua, LI Ying. Fabrication of Hierarchical Hemisphere Ag Substrate Using Transfer Imprinting with No Pressure Under Ambient Temperature^†[J]. Chem. J. Chinese Universities, 2017, 38(10): 1719.

Figures/Tables 6

Scheme 1 Fabrication of Ag substrate with hierarchical hemisphere using transfer imprinting

Fig.1 SEM images of self-assembled PS microspheres with diametes of 500 nm(A), 1080 nm(B) and 1500 nm(C)

Fig.2 AFM images of PDMS molds fabricated by PS microspheres of different sizes(A) 500 nm; (B) 1080 nm; (C) 1500 nm.

Fig.3 SEM images of PMMA patterns imprinted by PS microspheres of different sizes(A) 500 nm; (B) 1080 nm; (C) 1500 nm.

Fig.4 Reflectance spectra of PMMA hemispherical arrays and Si wafera. Si; b. 500 nm; c. 1080 nm; d. 1500 nm.

Fig.5 Raman spectra of Ag on the hierarchical hemisphere(a) and on flat Si wafer(b)

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