Phase-Selective Synthesis of CuInS2 Nanocrystals
Phase-Selective Synthesis of CuInS2 Nanocrystals
复制标题
DOI：
10.1021/jp905234y
复制
发表时间：
2009-08-20
影响因子：
3.7
通讯作者：
Vittal, Jagadese J.
中科院分区：
文献类型：
--
作者：
Batabyal, Sudip K.;Tian, Lu;Vittal, Jagadese J.
单源前驱体[（Ph 3 P）CuIn（SC{O}Ph）（4）]（1）和双源前驱体[Cu（SC{O}Ph）]（2）和[In（bipy）（SC{O}Ph）（3）]（3）已用于获得单分散的六方纤锌矿和立方闪锌矿相的铜铟硫化物纳米晶体（CIS NC）。通过X射线粉末衍射、透射电子显微镜、选区电子衍射和能量色散X射线分析对NC进行了表征。结果表明，表面活性剂的相对比例对CIS的纤锌矿或锌锌矿相的形成有影响。此外，反应温度在室温下稳定高温亚稳锌立方相方面起作用。在三辛基氧化膦（TOPO）和十二烷硫醇（DT）的存在下，当反应温度低于275 ℃时，1生成CIS的纤锌矿相，但高于该温度时，所得产物属于氧化锌（立方晶系）。CIS的形态也发生了变化，从纳米片到纳米颗粒，当它经历相变。在纤锌矿相中，在175 ℃下形成单分散的纳米片，并且在250 ℃下沿着片产生纳米棒（NR）。纤锌矿和锌钛矿CIS纳米晶在紫外区有较强的发光，在可见光区有较弱的发光。CIS NC的非线性光学（NLO）特性也已经用波长为780 nm的飞秒激光脉冲进行了表征。
Single-source precursor, [(Ph3P)CuIn(SC{O}Ph)(4)] (1), and dual-source precursors, [Cu(SC{O}Ph)] (2) and [In(bipy)(SC{O}Ph)(3)] (3), have been used to obtain the monodispersed wurtzite (hexagonal) and zincblende (also called sphalerite, cubic) phases of copper indium sulfide nanocrystals (CIS NCs). The NCs have been characterized by X-ray powder diffraction patterns, transmission electron microscopy, selected area electron diffraction, and energy-dispersive X-ray analysis. It is shown that the relative ratios of surfactants have influence on the formation of the wurtzite or zincblende phase of CIS. Moreover, the reaction temperature plays a role in stabilizing the high-temperature metastable zincblende cubic phase at room temperature. In the presence of trioctylphosphine oxide (TOPO) and dodecanethiol (DT), 1 generates the wurtzite phase of CIS when the reaction temperature is below 275 degrees C, but above this temperature the obtained product belongs to zincblende (Cubic). The morphology of the CIS also changes from nanoplates to nanoparticles when it undergoes phase transformation. In the wurtzite phase, monodispersed nanoplates are formed at 175 degrees C and nanorods (NRs) produced at 250 degrees C along with the plates. Wurtzite and zincblende CIS nanocrystals exhibit intense emission in the ultraviolet region and weak emission in the visible region. The nonlinear optical (NLO) properties of the CIS NCs have also been characterized with femtosecond laser Pulses at a wavelength of 780 nm.