الملخص

Colloidal copper nanoparticles were prepared by pulsed (Nd:YAG,Q-switch) laser ablation in distilled water with a wavelength (1064nm) and frequency (1Hz) and the duration of the pulse was (10ns). Its purity is (99.9) immersed in distilled (deionized) water, where the metal target was first removed from copper placed in (5mL) of distilled water with a specific laser energy (260mJ) and for a number of fixed laser pulses (50, 100, 150) respectively. The size and optical properties of nanoparticles were characterized by transmission electron microscopy (TEM) and visible-UV spectrometry, respectively. eV) at the pulse (50) and (2.77eV) at the (100) and its value was (2.69eV) at the (150) pulse. The reason for the increase is due to the amount of material removal being greater. The results of the transmission electron microscope showed colloidal nanoparticles somewhat spherical and carnivorous, as depend on the size of the noble nanoparticles have gained wide popularity with many applications and fields, and the reason for this is due to the need for precise miniaturization of electronic devices and because of their unique character that differs from those in the usual case. Metal colloids are one of the important nano-sized materials.