Preparation of Nanostructured HgI2 Nanotubes /Si Photodetector by Laser Ablation in Liquid

Abstract

In this work, HgI2 nanotubes/Si heterojunction has been prepared by pulsed laser ablation in ethanol at laser fluence of 12.7 J/cm2. The structural and optical properties of HgI2 nanotubes (NTs) are studied. The X-ray diffraction (XRD) result shows the presence of the mixture of tetragonal and orthorhombic phases of HgI2. The optical properties results show that the optical energy gap of HgI2 NTs was 2.98 eV measured at room temperature. The photoluminescence (PL) spectra of HgI2 display a single emission centered at 535nm. Fourier transformed infrared (FT-IR) results reveal the existence of small bonds at 612 and 1102 cm− 1. Scanning electron microscope (SEM) image show formation of nanotubes and spherical nanoparticles with average particle size of 23nm. Transmission electron microscope (TEM) image of HgI2 confirms the formation of nanotubes morphology with an average diameter of 80nm and an average length of 1.6µm. The I-V curve of HgI2 NTs/p-Si heterojunction were measured at dark and illumination. The responsivity of HgI2 NTs/p-Si heterojunction photodetector is 1.09A/W at 450 and the detectivity and external quantum efficiency are 3.6 ×1012 Jones at 450 and 3×102% at 400nm, respectively, without using post annealing.

Preparation of novel B4C nanostructure/Si photodetectors by laser ablation in liquid

“…The positive Hall coefficient of the B 4 C nanostructure films confirmed that they are p-type, which agrees with the reported data 25 . As shown in Table 2 , the electrical conductivity and mobility of B 4 C nanostructure film decreased as the laser pulses increased as a result of the large concentration of trapping centers and surface states.…”

“…This parameter is consider is one the most significant figures of merit of the silicon photodetectors 25 . Figure 15 shows the spectral responsivity of B 4 C/p-Si HJs photodetectors measured at a bias voltage of − 5 V prepared at different number of laser pulses.…”

Laser ablation mediated ZnO nanoparticles inhibit growth and biofilm forming potential of urinary tract bacterium Proteus mirabilis

“…Pulsed laser ablation in liquid (PLAL) is one of them, and it has been used to make a variety of nanomaterials. It is possible to synthesise a diverse range of nanomaterials, such as semiconductors, metals, ceramics, ides, and diamond-like zinc, by varying laser parameters such as wavelength, laser energy, ablation period, and repetition rate, and these parameters have a significant impact on the shape, size, and morphology of NPs generated by laser ablation in water [8][9][10][11][12]. The method of pulsed laser ablation in liquid has several distinct advantages over traditional physical and chemical nanoparticle preparation methods: (1) the size and shape of the produced nanoparticles can be precisely adjusted during synthesis by manipulating liquids and laser parameters [10]; (2) simple and inexpensive; (3) the final product is typically obtained without any by-products or the need for purification; and (4) using this method, you can create nanomaterial with the desired chemical composition and compound free surfaces [13].…”