聚共轭亚油酸基网状纳米金的制备及表面增强拉曼散射和催化性能

doi:10.7503/cjcu20140341

摘要/Abstract

摘要：

以天然不饱和脂肪酸共轭亚油酸(CLA)为绿色单体, 通过简单的分子自组装和可控自交联反应制备聚共轭亚油酸(PCLA)聚集体. 透射电子显微镜(TEM)结果显示, PCLA聚集体的形貌呈现独特网状结构, 其联结单元为来自于CLA胶束的膨大颗粒. 采用氯金酸在极性聚合物表面原位还原, 2 d后在网状PCLA基底上制备得到以CLA胶束为核(20 nm)的网状纳米金结构, 而且网状PCLA的原位还原作用与模板作用相结合是获得PCLA基网状纳米金的充分必要条件. 与普通球形胶态金纳米颗粒[(5±1) nm]相比, PCLA基网状纳米金对苯硫酚具有更好的表面增强拉曼散射(SERS)效应, 对对硝基苯酚具有更好的催化还原效果.

关键词: 共轭亚油酸, 网状聚集体, 纳米金, 表面增强拉曼散射效应, 催化

Abstract:

Networked poly(conjugated linoleic acid)(PCLA) aggregates were prepared from a natural polymerizable monomer, conjugated linoleic acid(CLA), through a simple strategy of molecular self-assembly followed by controlled self-crosslinking. The morphology of the PCLA aggregates by transmission electron micro-scopy(TEM), was a unique network structure with the CLA spherical particles as the junction units that were originated from the CLA micelles. Subsequently, the Au nano-network with core of CLA micelle(20 nm) was synthesized in 2 d through in situ reduction of gold on the surface of the PCLA network. It was found that the Au nano-network based on PCLA could be obtained if and only if PCLA provided both functions of in situ reduction and model. Moreover, the Au nano-network based on PCLA displays better surface-enhanced Raman scattering(SERS) for thiophenol and better catalytic effect on reduction of 4-nitrophenol than the normal spherical Au nanoparticles [(5±1) nm] does.

Key words: Conjugated linoleic acid, Networked aggregates, Nano Au, Surface-enhanced Raman scattering(SERS), Catalytic property

中图分类号:

O648

TrendMD:

樊晔, 方云, 陈韩婷, 高迪. 聚共轭亚油酸基网状纳米金的制备及表面增强拉曼散射和催化性能. 高等学校化学学报, 2014, 35(9): 1933.

FAN Ye, FANG Yun, CHEN Hanting, GAO Di. Preparation, SERS and Catalytic Properties of Au Nano-network Based on Poly(conjugated linoleic acid)^†. Chem. J. Chinese Universities, 2014, 35(9): 1933.

图/表 8

Fig.1 γ-lgc curve of CLA at pH=13 and 30 ℃

Fig.2 TEM images of PCLA prepared by thermal polymerization at 80℃ for 10 h(A), 40 ℃ for 24 h(B) using APS as initiator and by UV irradiation for 2 h using QTX as initiator(C)

Fig.3 UV spectra(A), IR spectra(B) and apparent size distribution(C)of the PCLA from the 3 mmol/L of aqueous CLA solution self-crosslinked at pH=13 and 80 ℃ for 10 h using APS as initiator a. Before self-crosslinking; b. after self-crosslinking.

Fig.4 TEM images(A—E) of the Au nano-network based on PCLA with different reaction time and EPMA of the Au nano-network at 2 d(F) pH=13, 3 mmol/L, 60 ℃. (A) 6 h;(B, C) 12 h;(D) 1 d;(E) 2 d.

Fig.5 TEM images of the Au nanoparticles prepared in the aqueous CLA solution(3 mmol/L, pH=13) at 60 ℃ for 1 h(A), 6 d(B) and in the PCLA solution exposed to sunlight at 60 ℃ for 2 d(C)

Fig.6 Schematic illustration of the formation of the Au nano-network based on PCLA

Fig.7 SERS spectra of phenthiol molecules adsorbed on goldleaf(a), Au nanoparticles(b) and Au nano-network based on PCLA(c)

Fig.8 UV-Vis spectra of reduction of 4-NP using NaBH4 as reductant and gold as catalyst (A) Control sample; (B) Au nano-network based on PCLA; (C) Au nanoparticles.

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