Cu-based ternary alloy nanocrystals have emerged for extensive applications in solar cells, light-emitting devices (LEDs), and photoelectric detectors because of their low-toxicity, tunable band gaps, and large absorption coefficients. It is still an enormous challenge that regulating optical and electrical properties through changing their compositions and shapes in alloy nanocrystals. Herein, we present a facile method to synthesize CuCdS alloy nanocrystals (NCs) with tunable compositions and shapes at relatively low temperature. Different morphologies of monodisperse CuCdS nanocrystals are tailored successfully by simply adjusting the reaction temperature and Cu:Cd precursor molar ratio. The as-synthesized nanocrystals are of homogeneous alloy structures with uniform obvious lattice fringes throughout the whole particles rather than heterojunction structures. The localized surface plasmon resonance (LSPR) absorption peaks of CuCdS NCs are clearly observed and can be precisely tuned by varying the Cu:Cd molar ratio. Moreover, current–voltage (I–V) behaviors of different shaped CuCdS nanocrystals show certain rectification characteristics. The alloy CuCdS NCs with tunable shape, band gap, and compositionpossess a potential application in optoelectronic devices.

铜基三元合金纳米晶体因其低毒，可调节的带隙和大吸收系数而在太阳能电池，发光器件（LED）和光电探测器中得到了广泛的应用。通过改变合金纳米晶体的组成和形状来调节光学和电学性质仍然是巨大的挑战。在本文中，我们提出了一种在相对较低的温度下合成具有可调组成和形状的CuCdS合金纳米晶体（NCs）的简便方法。通过简单地调节反应温度和Cu：Cd前驱体摩尔比，成功地定制了单分散CuCdS纳米晶体的不同形态。合成后的纳米晶体是均匀的合金结构，在整个颗粒中具有均匀的明显晶格条纹，而不是异质结结构。可以清楚地观察到CuCdS NCs的局部表面等离振子共振（LSPR）吸收峰，并且可以通过更改Cu：Cd摩尔比来精确调整。此外，电流-电压（I–V）不同形状的CuCdS纳米晶体的行为表现出一定的整流特性。具有可调形状，带隙和成分的合金CuCdS NCs在光电器件中具有潜在的应用。