排序方式: 共有47条查询结果,搜索用时 218 毫秒
31.
室温下以柠檬酸三纳为稳定剂,在水相中合成了PbS纳米粒子(NP-PbS)。用共振光散射技术(RLS)探索了最佳条件下,体系RLS强度(IRLS)与汞离子浓度在0.001—10μmol/L测定区间内呈现良好的线性(r=0.9941),据此,建立了测定水中的微量汞的方法。方法的检出限为0.6nmol/L,样品加标平均回收率为100.35%。 相似文献
32.
A low-cost photoconductive dual-band detector was prepared using a nanoporous ZnO film sensitized by PbS quantum dots (QDs). At room temperature the device shows a UV response in the wavelength range of 200-400 nm with a 370 nm peak responsivity of 4.0×105 V/W and a vis-NIR response from 500 to 1400 nm with a 700 nm peak responsivity of 5.4×105 V/W. By increasing the size of the PbS QD, the response can be extended up to 2.9 μm. It is suggested that the UV response is a result of interband absorption of UV radiation by ZnO and the IR response comes from the absorption of PbS QDs. 相似文献
33.
纯Y型硬脂酸铅LB膜的制备及结构表征 总被引:1,自引:0,他引:1
纯Y型硬脂酸铅LB膜的制备及结构表征陈海燕,彭笑刚,于连香,周勇亮,姜月顺,李铁津(吉林大学化学系,长春,130023)徐跃,高忠民,魏诠(吉林大学测试中心)关键词硬脂酸铅,LB膜转移,硫化铅单层膜在脂肪酸盐LB膜的沉积过程中,存在由Y型向X型沉积的... 相似文献
34.
35.
36.
DDP表面修饰PbS纳米微粒的合成及结构表征 总被引:2,自引:0,他引:2
采用表面修饰法合成了二烷基二硫代磷酸修饰的PbS纳米微粒,并用红外光谱,(IR),X射线衍射(XRD),透射电子显微镜(TEM),X射线光电子能谱(XPS)等仪器表征了其结构。结果表明,所合成的PbS纳米微粒是DDP表面修饰层和PbS纳米核所构成的,且由于表面修饰层的存在,有效地阻止了纳米微粒在空气中的团聚及氧化,其平均粒径为7nm。 相似文献
37.
The structural, morphological, optical, and nonlinear optical properties of a lead sulfide (PbS) thin film grown by chemical bath deposition (CBD) are investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet-visible (UV-Vis), and open aperture Z-scan experiments. The band gap energy of the PbS nanocrystalline film is 1.82 eV~ higher than that of bulk PbS at 300 K. The nonlinear absorption properties of the film are investigated using the open aperture Z-scan technique at 1064 nm and pulse durations of 4 ns and 65 ps. Intensity-dependent switching of the film from nonlinear absorption to saturable absorption is observed. The nonlinear absorption coefficient increases monotonically with increasing pulse duration from 65 ps to 4 ns. 相似文献
38.
39.
硫化铅矿石氧化率的测定方法研究 总被引:1,自引:0,他引:1
本文采用20%酒石酸铵-0.5%抗坏血酸-1%酒石酸溶液作为氧化铅矿物与方铅矿分离的选择性溶剂。在选定条件下,氧化铅矿物的浸取率均大于99%,方铅矿仅溶解0.37%,黄铁矿和方解石的干扰均可消除。解决了现行方法中所测氧化率偏高的问题。 相似文献
40.