Gold Nanowires Based on Photonic Crystal Fiber by Laser Ablation in Liquid to Improve Colon Biosensor

Abstract

In this work, gold nanoparticles have been synthesized using second harmonic generation ND-YAG laser ablation in Ethanol employing 532 nm and 1.064 nm wavelengths. Field emission scanning electron microscope (FESEM), Transmission electron microscopy (TEM)X-Ray diffraction (XRD), Atomic force microscopy (AFM), photoluminescence (PL) spectroscopy, and UV-Vis absorption were employed to examine the structural, chemical and optical properties of Au NPs. XRD results showed that all synthesized Au nanoparticles are crystalline in nature. the optical band gap upon ablation using the higher wavelength (1064 nm) was about (4.02 eV). While the value of the optical bandgap increases to reach a value of (4.22 eV) at the shorter wavelength (532 nm The FESEM results reveal the formation of smaller nano rode size at second-harmonic generation (SHG) wavelength was found to be about (30 nm at wavelength 532 nm and 44 nm at 1064nm). After that, Finite Element Analysis is used to simulate the photonic crystal fiber (PCF) as biosensors, depending on the surface Plasmon resonance (SPR) phenome-non using COMSOL Multiphasic program. The hollow core-photonic crystal fiber (HC-PCF) HC-800 was thus overfilled with (water). The confinement loss (CL) of the fundamental mode for the proposed PCF with and without the gold nanoparticles was calculated, we observe without gold NPs the CL at the water and Colon tissue about (1.08E+03, 5.46E+02) dB/m, while at use the deposited PCF with gold NPs the results ensured the decrease more than in the confinement loss at the water and Colon tissue about (1.01E+03, 3.16E+02) dB/m with a clear shift toward higher wavelengths, also when calculating the sensitivity, to increase HC-PCF bio-sensor performance by using wavelength interrogation and amplitude measurements, it found the bio-liquid (colon tissue) has the best electric field using the gold NWs layer in the biosensor equal to 68.8 V/m by comparison when without using the gold NWs layer which leads to high sensitivity.

High performance gold-nanowires-coated PCF-SPR sensor for refractive index detection

“…Firstly, the fabrication of PCF preforms without gold wires is made in a high temperature environment using the conventional stacking and fusing of capillary arrays [31] . Next, the preparation of gold nanowires [32,33] . Thirdly, the gold nanowire can be selectively filled using the fiber by the spliced-fiber pressure-filling technique or the high-pressure chemical deposition techniques [34,35] .…”

Antibacterial and hemocompatibility potentials of nano-gold-cored alginate preparation against anaerobic bacteria from acne vulgaris

“…The NPs can achieve greater bactericidal, and therapeutic effects than antibiotics and polymers because of their specific physicochemical characteristics and the molecular framework of their chemical structure 8 , 9 . The metal NPs have many of these properties of size, charge, and chemo-biological reactivity, that have made them particularly suitable for biological applications 10 . Among the prominent metal NPs, the gold NPs (AuNPs) exhibit a wide range of unique physico-chemical properties owing to their shape, naked and coated NPs reactivity, catalytic and oxidative behavior, surface charge, size and surface area, and higher ratio.…”

Optical Properties of Gallium Nitride Heterostructures Grown on Quartz Using Pulse Laser Deposition Method

“…Gallium nitride (GaN) is a very thermally conductive material. It is wellsuited for several applications, including sensors, solar cells, light-emitting diode devices, short-wavelength optical devices, high-power transistors, and beta-voltaic devices [8][9][10][11][12][13][14][15][16][17][18][19].…”