Synthesis and Morphology Control of Janus Nanomaterials†

doi:10.7503/cjcu20150152

Abstract

Abstract:

We propose a facile method to synthesize Janus nanomaterials by seed interfacial sol-gel process against a polystyrene(PS) hollow sphere using three precursor silanes, (3-aminopropyl) triethoxysilane(APTES), methacryloxy propyl trimethoxyl silane(MPS) and tetraethyl orthosilicate(TEOS). The sol-gel process starts from the exterior surface of the seed sphere. Janus nanomaterials were formed in situ onto the seed sphere surface after a self-organized sol-gel process, which possess 3-methacryloxypropyl- and amine- groups terminated at both sides of the shell. Morphology of the Janus nanomaterials could be tunable from intact shell, nanosheet, porous nanosheet and individual nanoparticles by controlling pH, precursor amount and the fraction of binary emulsifier system. After the removal of PS by dissolution under ultrasonication, Janus nanoparticles were eventually achieved. This method is attractive owing to the easiness to continuously adjust morphology of the Janus nanomaterials. On the other hand, composition of the nanomaterials is also flexibly tunable by using different precursors. What’s more, the Janus nanomaterials can derive other Janus ones after selective modification and favorable growth of desired materials onto the corresponding side.

Key words: Janus nanomaterial, Sol-gel, Interface, Morphology control

CLC Number:

O631
O648.11

TrendMD:

ZHOU Peng, LIU Bao, LIANG Fuxin, WANG Qian, QU Xiaozhong, YANG Zhenzhong. Synthesis and Morphology Control of Janus Nanomaterials^†[J]. Chem. J. Chinese Universities, 2015, 36(7): 1431.

Figures/Tables 9

Scheme 1 Synthesis of Janus materials by seed emulsion swelling sol-gel process

Fig.1 SEM image of PS hollow sphereInset: TEM image of PS hollow sphere.

Fig.2 SEM and TEM(inset) images of composite sphere(A, C) and Janus hollow sphere(B, D)(A, B) pH=4; (C, D) pH=11.

Fig.3 FTIR spectra of the PS sphere(a), composite sphere(b) and Janus hollow sphere(c)

Fig.4 Zeta potential of PS sphere(a) and APTES modified SiO2 Janus composite sphere(b)

Fig.5 SEM images of the Janus nanosheets(A), selectively labeling with Au nanoparticles(B) and Janus hollow sphere after being labeled with Au nanoparticles(C)

Table 1 EDX element analysis of Janus hollow sphere after being labeled with Au nanoparticles

Element	Si	O	C	N	Au
Mass fraction(%)	53.55	37.14	3.45	3.62	2.24

Fig.6 Dependence of silica content of the composite sphere on TEOS/seed sphere ratio

Fig.7 SEM and TEM(inset) images of Janus hollow spheres from the composite spheres synthesized at m(TEOS)/m(Seed sphere) of 1/8(A) and 1/16(B), respectively

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