In the present study, laser ablation technique (Nd:YAG) has been applied to synthesize platinum nanoparticles (NPs). Also, the effect of applied electric field on the physical, structural, and morphological properties of Pt NPs has been investigated during the nanosecond pulsed laser ablation of platinum. Based on the results extracted from TEM and scanning electron microscopy images, the formation of high percentage of NPs with spherical shape is demonstrated in all samples. The increase of applied electric field creates few rectangular, hexagonal, and rhombic NPs with the average size decreased from 20 to 9 nm. The significant influence of increasing electric field is also observed in UV–vis spectra by appearing the blue shift of the localized surface plasmon resonance peak. The UV–vis spectra also confirm the metallic nature of Pt NPs and the existence of inhomogeneous-sized particles and the coagulation of particle because of the long tail in higher wavelengths. In addition, atomic force microscopy images have been analyzed through MountainsMap Premium program and fractal dimension. As can be seen, increasing the applied electric field make the surface more irregular and the maximum value of D_f reveals the most irregular topography for sample with 50 V/cm electric field. Finally, the bending and stretching frequencies of the functional bending groups connected to the NPs surface have been characterized by Fourier transform infrared spectroscopy. Electrical field-assisted laser ablation in liquids method allows a better control of the size, morphology, structure, and chemical composition of nanoparticles.

中文翻译：

---

外加电场对激光烧蚀合成铂纳米粒子微观形貌的影响

在本研究中，激光烧蚀技术 (Nd:YAG) 已被应用于合成铂纳米粒子 (NPs)。此外，在铂的纳秒脉冲激光烧蚀过程中，还研究了外加电场对 Pt NPs 的物理、结构和形态特性的影响。根据从 TEM 和扫描电子显微镜图像中提取的结果，在所有样品中都证明了高百分比的球形纳米颗粒的形成。外加电场的增加产生很少的矩形、六边形和菱形纳米颗粒，平均尺寸从 20 nm 减小到 9 nm。通过出现局部表面等离子体共振峰的蓝移，在紫外-可见光谱中也观察到增加电场的显着影响。UV-vis 光谱还证实了 Pt NPs 的金属性质以及不均匀尺寸颗粒的存在以及由于较高波长的长尾而导致的颗粒凝结。此外，原子力显微镜图像已通过 MountainsMap Premium 程序和分形维数进行分析。可以看出，增加外加电场使表面更不规则，最大值D _f揭示了具有 50 V/cm 电场的样品最不规则的形貌。最后，通过傅里叶变换红外光谱表征了连接到 NPs 表面的功能性弯曲基团的弯曲和拉伸频率。电场辅助液体激光烧蚀方法可以更好地控制纳米颗粒的尺寸、形态、结构和化学成分。