Synthesis and photophysical properties of EuS nanoparticles from the thermal reduction of novel Eu(III) complex
Synthesis and photophysical properties of EuS nanoparticles from the thermal reduction of novel Eu(III) complex
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DOI：
10.1021/jp0567826
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发表时间：
2006-05-11
影响因子：
3.3
通讯作者：
Wada, Y
中科院分区：
文献类型：
--
作者：
Hasegawa, Y;Okada, Y;Wada, Y
采用单源前驱体（SSP）（PPh 4）[Eu（S2 CNEt 2）4]中心点2 H（2）O，在微波辐射下热还原合成了EuS纳米粒子。发现EuS纳米颗粒的平均尺寸为8 nm（尺寸为3-16 nm）。通过FT-IR、NMR和MS分析观察到EuS表面上的有机产物。我们发现，这些是由于SSP的化学反应，并覆盖在表面。SSP的热反应得到EuS纳米颗粒和有机产物（（SCN）-S-中心点（Et）（2））。有机产物通过热反应中形成的自由基的偶联将产生二聚物（Et）（2）NC（S）-（S）CN（Et）（2），和/或通过自由基的聚合在溶液中产生硫聚合物。有机产物的有效表面改性导致EuS表面的保护，导致在室温下形成强发光EuS纳米颗粒（发射峰= 350 nm，fwhm = 58 nm，发射量子产率= 27 +/-5%）。
EuS nanoparticles were synthesized by the thermal reduction of single source precursor (SSP), (PPh4)[Eu(S2CNEt2)4]center dot 2H(2)O, under microwave irradiation. The average size of the EuS nanoparticles was found to be 8 nm (3-16 nm in size). The organic products on the EuS surface were observed by using FT-IR, NMR, and MS analyses. We have found that these are resulted from the chemical reactions of SSP and cover the nanocrystal surface. A thermal reaction of SSP gave EuS nanoparticles and the organic product ((SCN)-S-center dot(Et)(2)). The organic product would make a dimmer, (Et)(2)NC(S)-(S)CN(Et)(2), by the couping of the radicals formed in the thermal reaction and/or thiopolymer in the solution through the polymerization of the radicals. The effective surface modification by the organic products led to protection of the EuS surface, resulting in the formation of the strongly luminescent EuS nanoparticles at room temperature (emission peak = 350 nm, fwhm = 58 nm, emission quantum yield = 27 +/- 5%).