Water/Supercritical CO2 Microemulsions with a Fluorinated Double-tail Surfactant for Syntheses of Semiconductor Ultrafine Particles

Masanobu Sagisaka, M. Hino, H. Sakai, M. Abe, A. Yoshizawa
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引用次数: 10

Abstract

A water/supercritical CO 2 microemulsion (W/scCO 2 μE) with a fluorinated double-tail surfactant bis (1H,1H,2Η,2H-heptadecanuorodecyl)-2-sulfosuccinate (8FS(EO) 2 ) was evaluated in terms of its nanoreactor performance for synthesizing semiconductor ultrafine particles of TiΟ 2 , ZnS, and CdS. By the addition of tetraisopropylorthotitanate (TIP) in W/scCO 2 μE, TiO 2 ultrafine particles were successfully synthesized with a spherical shape and sizes of several tens of nanometers, which were similar to those synthesized in W/cyclohexane μE with a typical hydrocarbon double-tail surfactant AOT. Interestingly, in contrast to the μE system, TiO 2 particle syntheses in liquid-crystal-like (LC-like) surfactant precipitant phase yielded a dendritical morphology of TiO 2 . For metal sulfide synthesis, the addition of metal nitrates as precursors in W/scCO 2 μE was found to lower the maximum W 0 value at which W/scCΟ 2 μE can form, which would result from the promoted aggregation and fusion between reverse micelles, i.e., LC formation. After mixing both the W/scCΟ 2 μEs containing metal nitrate and Na 2 S, metal sulfide ultrafine particles were yielded with spherical shape and sizes of several tens of nanometers. These results suggested that W/scCΟ 2 μE with 8FS (EO) 2 may become a valuable nanoreactor when further investigations reveal size-control techniques for the products.
含氟双尾表面活性剂的水/超临界CO2微乳用于半导体超细颗粒的合成
采用氟化双尾表面活性剂bis (1H,1H,2Η, 2h -庚十四烷基)-2-磺基琥珀酸盐(8FS(EO) 2)制备了水/超临界co2微乳液(W/ scco2 μE),并对其纳米反应器性能进行了评价,以制备TiΟ 2、ZnS和CdS半导体超细颗粒。通过在W/scCO 2 μE中加入四异丙基氯钛酸酯(TIP),成功合成了粒径为几十纳米的球形二氧化钛超细颗粒,与在W/环己烷μE中使用典型碳氢化合物双尾表面活性剂AOT合成的二氧化钛超细颗粒相似。有趣的是,与μE体系相比,在类液晶(LC-like)表面活性剂沉淀相中合成的tio2颗粒产生了树枝状的tio2形貌。对于金属硫化物的合成,在W/scCO 2 μE中加入金属硝酸盐作为前驱体可以降低W/scCΟ 2 μE形成的最大W 0值,这是由于促进了反胶束之间的聚集和融合,即LC的形成。将含有硝酸金属的W/scCΟ 2 μEs与Na 2s混合后,可以得到球形、几十纳米大小的金属硫化物超细颗粒。这些结果表明,当进一步研究产品的尺寸控制技术时,W/scCΟ 2 μE与8FS (EO) 2可能成为一种有价值的纳米反应器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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