Colloidal synthesis of organic-capped ZnO nanocrystals via a sequential reduction-oxidation reaction
Colloidal synthesis of organic-capped ZnO nanocrystals via a sequential reduction-oxidation reaction
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DOI：
10.1021/jp0457139
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发表时间：
2005-02-24
影响因子：
3.3
通讯作者：
Weller, H
中科院分区：
文献类型：
--
作者：
Cozzoli, PD;Kornowski, A;Weller, H
提出了一种在均相有机溶液中制备量子尺寸（d < 9 nm） ZnO纳米晶体的非水解途径。采用超氢化物（LiBEt3H）对卤化锌进行热还原（180 ~ 250℃），然后对产物进行氧化，在十六胺和油酸（OLEA）的表面活性剂混合物中生长出接近球形的ZnO纳米晶体。实验结果表明，ZnO在纳米尺度下的受控生长既取决于olea辅助生成的中间金属纳米颗粒，也取决于温和氧化剂三甲胺- n -氧化物对其氧化条件的调节，而不是分子氧。本合成方法特别适合制备具有低分散尺寸和稳定尺寸的有机可溶性超小ZnO纳米晶体，具有光电、催化和传感等应用前景。
A nonhydrolytic route to quantum-sized (d < 9 nm) ZnO nanocrystals in homogeneous organic solutions is presented. Nearly spherical ZnO nanocrystals were grown in a surfactant mixture of hexadecylamine and oleic acid (OLEA) by means of a two-step chemical process, based on the hot reduction (at 180-250 degreesC) of a zinc halide by superhydride (LiBEt3H) followed by oxidation of the resulting product. The experimental results suggested that the controlled growth of ZnO in the nanosized regime depended both on the OLEA-assisted generation of intermediate metallic nanoparticles and on the adjustment of their oxidation conditions by using a mild oxidant, trimethylamine-N-oxide, rather than molecular oxygen. The present synthetic approach demonstrates to be particularly suitable to prepare organic-soluble ultra-small ZnO nanocrystals of low size dispersion and of stable size, which are appealing for optoelectronic, catalytic, and sensing purposes.