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Control of Crystal Growth in Local Electroless Gold Deposition by Pyridinium Based Surfactants
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-05-22 00:00:00 , DOI: 10.1021/acs.cgd.8b00228 Roman G. Fedorov 1 , Daniel Mandler 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-05-22 00:00:00 , DOI: 10.1021/acs.cgd.8b00228 Roman G. Fedorov 1 , Daniel Mandler 1
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The formation and local deposition of well-shaped Au nanostructures on a nonconducting surface are described. Specifically, the local electroless deposition of Au in aqueous solutions in the presence of various n-alkylpyridinium surfactants is driven by electrochemically generating a flux of AuCl4– at a gold tip close to a 3-mercaptopropyltrimethoxysilane modified Si oxidized wafer. Two reducing agents, NaBH4 and ascorbic acid, were used for the reduction of the gold ions. We studied the effect of the solution temperature, the potential applied to the gold tip and its distance from the surface, the reductant, and the nature of the alkylpyridinium on the structure of the gold deposit. The chloride salts of methylpyridinium, butylpyridinium, cetylpyridinium, 4-carbamoyl-1-cetylpyridinium, and 4-methyl-1-cetylpyridinium were added separately and showed remarkable effect on the shape of the structures that were formed. We find that short chain n-alkylpyridinium salts do not adsorb preferentially on the gold facets, whereas the longer chain n-alkylpyridinium ions cause the formation of well-faceted Au structures, such as cubes, hexagons, and even multipods. Moreover, comparison between local and bulk deposition revealed a significant difference in Au structures that were formed, presumably due to the different concentration profile of the AuCl4–.
中文翻译：
吡啶基表面活性剂控制局部化学金沉积过程中晶体的生长
描述了非导电表面上形状良好的Au纳米结构的形成和局部沉积。具体而言，在各种的存在水溶液Au构成的本地电沉积Ñ烷基吡啶的表面活性剂是由电化学产生AUCL的通量从动4 -在一个金尖端接近3-巯基改性的Si氧化的晶片。两种还原剂NaBH 4用抗坏血酸和抗坏血酸还原金离子。我们研究了溶液温度，施加在金尖端上的电势及其与表面的距离，还原剂以及烷基吡啶鎓的性质对金矿结构的影响。分别添加甲基吡啶鎓，丁基吡啶鎓，十六烷基吡啶鎓，4-氨基甲酰基-1-十六烷基吡啶鎓和4-甲基-1-十六烷基吡啶鎓的氯化物盐，它们对形成的结构的形状具有显着影响。我们发现短链正烷基吡啶鎓盐不会优先吸附在金面上，而长链正烷基盐-烷基吡啶鎓离子导致形成多面的Au结构，例如立方体，六边形，甚至是多脚架。此外，本地和批量之间沉积比较显示了形成的，大概是由于AUCL的不同浓度分布在金结构一个显著差4 - 。
更新日期：2018-05-22
中文翻译：
吡啶基表面活性剂控制局部化学金沉积过程中晶体的生长
描述了非导电表面上形状良好的Au纳米结构的形成和局部沉积。具体而言，在各种的存在水溶液Au构成的本地电沉积Ñ烷基吡啶的表面活性剂是由电化学产生AUCL的通量从动4 -在一个金尖端接近3-巯基改性的Si氧化的晶片。两种还原剂NaBH 4用抗坏血酸和抗坏血酸还原金离子。我们研究了溶液温度，施加在金尖端上的电势及其与表面的距离，还原剂以及烷基吡啶鎓的性质对金矿结构的影响。分别添加甲基吡啶鎓，丁基吡啶鎓，十六烷基吡啶鎓，4-氨基甲酰基-1-十六烷基吡啶鎓和4-甲基-1-十六烷基吡啶鎓的氯化物盐，它们对形成的结构的形状具有显着影响。我们发现短链正烷基吡啶鎓盐不会优先吸附在金面上，而长链正烷基盐-烷基吡啶鎓离子导致形成多面的Au结构，例如立方体，六边形，甚至是多脚架。此外，本地和批量之间沉积比较显示了形成的，大概是由于AUCL的不同浓度分布在金结构一个显著差4 - 。
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