Undoped, Eu- and La-doped CuS nanoparticles stabilized by l-cysteine were synthesized by a low-temperature soft aqueous route. Their structural properties were investigated by X-ray powder diffraction, their morphological properties were scrutinized using scanning electron microscopy, their microstructural properties were carried out using transmission electron microscopy, their optical properties were examined using ultraviolet–visible spectroscopy, and their electrical properties were studied using complex impedance spectroscopy. It was found that Cu_0.99La_0.01S nanoparticles exhibit the smallest particle size, the highest optical bandgap, the highest values of electrical conductivity and dielectric constant, and the lowest values of dielectric loss tangent when compared with CuS and Cu_0.99Eu_0.01S nanoparticles. To investigate the effect of the as-synthesized nanoparticles on the superconducting properties of bismuth-based compound ((Bi,Pb)₂Sr₂Ca₂Cu₃O_δ), its structural properties were examined by X-ray powder diffraction, its transport properties were analyzed by the standard four-probe technique, its intrinsic properties were investigated using the Aslamazov–Larkin approach and its pinning properties were studied using the thermally activated flux flow model. It was found that Cu_0.99La_0.01S added sample exhibits the highest Bi-2223 phase concentration, the lowest residual resistivity, the highest critical transition temperature, the lowest value of coherence length, the highest values of penetration depth, upper critical magnetic field and critical current density, the narrowest shift of the zero-resistivity temperature, the highest effective pinning energies and the highest global critical current densities, when compared with pure, CuS and Cu_0.99Eu_0.01S added samples.

通过低温软水路线合成了由l-半胱氨酸稳定的未掺杂，Eu和La掺杂的CuS纳米颗粒。通过X射线粉末衍射研究它们的结构性质，使用扫描电子显微镜检查它们的形态性质，使用透射电子显微镜检查它们的微观结构性质，使用紫外-可见光谱检查它们的光学性质，并且研究它们的电性质。使用复数阻抗谱。发现Cu _0.99 La _0.01与CuS和Cu _0.99 Eu _0.01 S纳米粒子相比，S纳米粒子具有最小的粒径，最高的光学带隙，最高的电导率和介电常数以及最低的介电损耗角正切值。为了研究对铋系化合物的超导特性（的（Bi，Pb）的所合成的纳米颗粒的效果₂的Sr ₂的Ca ₂的Cu ₃ ö _δ），通过X射线粉末衍射检查其结构性质，通过标准四探针技术分析其传输性质，使用Aslamazov–Larkin方法研究其固有性质，并使用热活化的通量流研究其钉扎性质模型。发现Cu _0.99 La _0.01添加的S样品具有最高的Bi-2223相浓度，最低的剩余电阻率，最高的临界转变温度，最低的相干长度值，最高的穿透深度，上临界磁场和临界电流密度值，最小的位移与纯铜，添加CuS和Cu _0.99 Eu _0.01 S的样品相比，零电阻温度，最高有效钉扎能量和最高全局临界电流密度。