α-Fe2O3/Ag核壳结构纳米复合颗粒的制备及SESR性能

摘要/Abstract

摘要：

用籽晶法，以甲醛为还原剂、3-氨丙基三乙氧基硅烷(APS)为改性剂，在Ag［(NH₃)₂］⁺溶液中制备α-Fe₂O₃/Ag核壳结构复合粉体。采用XRD、TEM和EDX对样品进行表征，系统研究了APS改性剂、醇水比等对复合纳米颗粒包覆效果及性能的影响；并用吡啶(Py)为探针，研究了α-Fe₂O₃/Ag核壳纳米颗粒作为拉曼衬底时的拉曼增强性能

Abstract:

With the seeding method, α-Fe₂O₃/Ag core-shell composite powders were prepared by the reduction of Ag［(NH₃)₂］⁺ with formaldehyde as reductant, and 3-aminopropyl triethoxysilane as additive.3-Aminopropyl triethoxysilane (APS) acted as a “bridge” to connect α-Fe₂O₃ and Ag particles.The obtained nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and energy-dispersive X-ray spectrometry (EDX).The influences of concentration of APS, volume ratio of alcohol to water on the coating effect and performance of nanocomposites were investigated.With pyridine (Py) as a molecule probe, Raman spectroscopy (SERS) properties and stability of the α-Fe₂O₃/Ag core/shell composite particles were studied.The results showed that the obtained α-Fe₂O₃/Ag composites were coated completely, well-dispersed and the average sizes were approximately 65 nm, when the dosage of APS was 0.75%(mass) and the volume ratio of alcohol to water was 5∶1.By coating Ag layer，the intensities of SERS were enhanced at 1010 cm^-1 and 1038 cm^-1.Especially, the signals of Py absorbed on α-Fe₂O₃/Ag substrate were greatly increased at 1038 cm^-1.And this substrate was fairly stable after being placed in air for one month.

王春蓉, 王淑梅, 周竹发, 田冉冉, 李延洁, 戴小春, 田盛. α-Fe₂O₃/Ag核壳结构纳米复合颗粒的制备及SESR性能 [J]. 化工学报, 2011, 62(1): 276-280.

WANG Chunrong, WANG Shumei, ZHOU Zhufa, TIAN Ranran, LI Yanjie, DAI Xiaochun, TIAN Sheng. Preparation of α-Fe₂O₃/Ag core/shell nanocomposites and SERS properties[J]. CIESC Journal, 2011, 62(1): 276-280.

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α-Fe₂O₃/Ag核壳结构纳米复合颗粒的制备及SESR性能

Preparation of α-Fe₂O₃/Ag core/shell nanocomposites and SERS properties

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