Synthesis of Ag/mSiO2 Hollow Microspheres for SERS-tags†

doi:10.7503/cjcu20131252

Abstract

Abstract:

Ag/mSiO₂ hollow microspheres were synthesized via the following steps. Monodisperse polystyrene(PS) colloidal microspheres were coated with Ag nanoparticles through in situ reduction and growing seeds. The composite microspheres were then controllably coated with mesoporous silica shell using cetyl trimethyl ammonium bromide(CTAB) as pore-forming agent. After getting rid of template, Ag/mSiO₂ hollow microspheres were obtained. To actualize SERS-tags detection, the hollow microspheres were subsequently tagged with 4-ATP via siphonage effect. Due to the air-resistance effect of mesoporous channel and light’s multiple scattering in the interior of hollow microspheres, the obtained SERS-tags material showed low limit of detection and high stability.

Key words: Ag, Mesoporous silica, Hollow microspheres, SERS-tags

CLC Number:

O646

TrendMD:

REN Zhiyu, LI Zhongtao, DU Shichao, WU Jun, KONG Lingjun, FU Honggang. Synthesis of Ag/mSiO₂ Hollow Microspheres for SERS-tags^†[J]. Chem. J. Chinese Universities, 2014, 35(7): 1541.

Figures/Tables 5

Fig.1 SEM image of PS/Ag@mSiO2 microspheres before(A) and after(B) calcination nd TEM images(C, D) of Ag/mSiO2 hollow microspheres The inset image of (D) is the HRTEM image.

Fig.2 EDX(A) and XRD patterns(B) and UV spectrum(C) of Ag/mSiO2 hollow microspheres

Fig.3 N2 adsorption-desorption isotherm(A) and the corresponding BJH pore size distribution lot(B) of Ag/mSiO2 hollow microspheres

Fig.4 Raman spectra of 4-ATP solid(A) and SERS spectra of 4-ATP adsorbed on Ag/mSiO2 hollow microspheres(B) (B) c(4-ATP)/(mol·L-1): a. 10-3; b. 10-4; c. 10-5; d. 10-6; e. 10-7.

Fig.5 SERS spectra of 4-ATP adsorbed on g/mSiO2 hollow microspheres a. Flesh; b. after stored for 30 d.

References 16

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Synthesis of Ag/mSiO₂ Hollow Microspheres for SERS-tags^†

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