Selective growth of Ag nanodewdrops on Au nanostructures: a new type of bimetallic heterostructure.

Selective growth of Ag nanodewdrops on Au nanostructures: a new type of bimetallic heterostructure.
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DOI:
10.1021/la901490w
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发表时间:
2009-10-06
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Zhang J
Zhang J
中科院分区:
其他
文献类型:
--
作者:
Gao L;Fan L;Zhang J

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采用电化学方法在金花的花瓣尖上选择性生长银纳米露珠,制备了一种新型的双金属Au-Ag异质结构材料。采用聚乙烯基吡咯烷酮(PVP)涂层对金属花瓣表面进行钝化处理,形成花瓣的反应尖端,并严格控制整个过程。形成的Au-Ag HSFs直径约为2 μm,在Au花瓣的尖端沉积了约50 nm的Ag颗粒。在表面增强拉曼散射(SERS)中,发现Au-Ag HSFs表现出优异的性能。Ag纳米露珠的存在还可以促进Ru(bpy)32+配合物在电致化学发光(ECL)测量中的氧化,并显著提高发射强度。ag - au - HSFs的特性为其在化学和生物传感器领域的应用提供了一种新型的非均相双金属合金材料。
A new type of bimetallic Au-Ag heterostructured material was prepared by a selective growing strategy of Ag nanodewdrop on the petal tip of Au flower using electrochemical method. The whole process was strictly controlled by forming the reactive tip of flower petal and passivating the facet along the body of metal petal using poly(vinyl pyrrolidone)(PVP) coating film. The formed Au-Ag HSFs were observed to be about 2 μm in diameter and have the Ag particles of about 50 nm settled on the tips of Au petals. The Au-Ag HSFs were found to display the superior properties on the surface-enhanced Raman scattering (SERS). The presence of Ag nanodewdrops could also facilitate the oxidation of Ru(bpy)32+ complex in electrogenerated chemiluminescence (ECL) measurements and dramatically enhance the emission intensity. The features of Au-Ag HSFs can promise a new type of heterogeneous bimetallic alloy material for the potential applications in chemical and biological sensors.
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