论文部分内容阅读
以Pb(NO3)2,Na(S2CNEt2)·3H2O为反应物,在去离子水中合成含硫金属有机配合物Pb(S2CNEt2)2.氩气保护下,在油酸和十八烯混合溶液中热分解前躯体Pb(S2CNEt2)2,反应时间分别为30,60,90,120 min,获得PbS量子点样品a,b,c,d.通过红外光谱分析和热重-差热等手段对前躯体进行表征,证明配体Na(S2CNEt2)·3H2O中的两个硫原子与Pb2+配位成功.PbS量子点样品X射线衍射和透射电子显微镜分析表明,合成的PbS为类球形纯立方晶系PbS纳米晶;对PbS量子点样品紫外-可见吸收光谱和光致发光谱进行研究发现,吸收光谱和光致发光谱随着反应时间的增加顺序红移,表明优化热分解反应时间可以调控PbS量子点的吸收光谱和光致发光谱.PbS量子点样品a发射峰在1080 nm,与硅基太阳能电池相匹配,可作为硅基荧光太阳能聚集器的荧光材料.
Pb (NO3) 2 and Na (S2CNEt2) · 3H2O were used as the reactants to synthesize Pb (S2CNEt2) 2, a metal complex containing sulfur in deionized water. Under the protection of argon, the mixture of oleic acid and octadecene Decomposition of precursor Pb (S2CNEt2) 2, the reaction time was 30,60,90,120 min, PbS quantum dot samples were obtained a, b, c, d by infrared spectroscopy and thermogravimetry - differential thermal and other means to characterize the precursor , Which proved that the coordination between two sulfur atoms in the ligand Na (S2CNEt2) · 3H2O and Pb2 + was successful.The X-ray diffraction and transmission electron microscopy analysis of PbS quantum dot samples showed that the synthesized PbS was spheroidal pure cubic PbS nanocrystals, The UV-Vis absorption spectra and photoluminescence spectra of PbS quantum dots samples show that the absorption spectra and photoluminescence spectra are red-shifted sequentially with the increase of reaction time, indicating that optimizing the thermal decomposition reaction time can adjust the absorption spectra and photoluminescence of PbS quantum dots The emission spectrum of PbS quantum dot sample a is at 1080 nm, which matches the silicon-based solar cell and can be used as fluorescent material for silicon-based fluorescent solar concentrator.