Conductivity Modification of ZnO NRs Films via Gold Coating for Temperature Sensor Application

Faisal, Abdulqader D.; Khalef, Wafaa K.; Salim, Evan T.; Alsultany, Forat H.; Wahid, M. H. A.

doi:10.4028/p-25h5n1

Cited by 9 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[38,39]. These devices have critical applications in the industrial, military, and space sectors [40,41]. The choice of procedures and parameters for GaN film fabrication significantly influences the films' electrical and optical properties [42,43].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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

Abeer R. Abbas,

Makram A. Fakhri,

Motahher A. Qaeed

et al. 2024

IJNeaM

View full text Add to dashboard Cite

An optical analysis was conducted on a Gallium nitride (GaN) thin film grown on a quartz substrate using the physical vapor deposition technique (PVD), specifically, pulsed laser deposition (PLD). The film was grown using different laser wavelengths (1064, 532, and 355) nm from a Q-switch neodymium-doped yttrium aluminum garnet (Nd: YAG) laser, all performed under a vacuum pressure of 10-2 m bar. The absorption coefficient of the GaN thin film was determined by performing UV-Vis diffused spectroscopy at room temperature and measuring wavelengths ranging from 200 to 1000 nm. The absorption peak occurs at 227 nm when the wavelength is 1064 nm, at 217 nm when the wavelength is 532 nm, and at 222 nm when the wavelength is 355 nm. The optical energy gap is a crucial statistic for analyzing the properties of thin films and assessing their potential as gas sensors. The value of the direct energy gap (Eg) for the prepared films was established by analyzing the graph that shows the relationship between (α h) and the energy gap (ev) values at different wavelengths. The energy values were determined to be 3.36 eV, 3.62 eV, and 3.7 eV for 1064, 532, and 355 nm wavelengths, respectively.

show abstract

Section: Theoretical Backgroundmentioning

confidence: 99%

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

Abeer R. Abbas,

Makram A. Fakhri,

Motahher A. Qaeed

et al. 2024

IJNeaM

View full text Add to dashboard Cite

show abstract

“…Additionally, because of its excellent thermal conductivity and large heat capacity, it is appropriate for high-power electrical equipment. Due to their potential application in solid-state lighting, the optical characteristics of GaN nanostructures have also drawn a lot of attention [16][17][18]. GaN is an overall promising material for a variety of technological applications thanks to its unique features.…”

Section: Introductionmentioning

confidence: 99%

Physical Investigations of GaN/Porous Silicon at Different Laser Wavelengths

Rusul S. Rashed,

Makram A. Fakhri,

Ali A. Alwahib

et al. 2024

IJNeaM

View full text Add to dashboard Cite

In this study, we prepared PSi using the laser-assisted electrochemical etching method and deposited Gallium nitride (GaN) on the PSi substrate using the pulsed laser technique at different pulsed laser wavelengths (1064, 532, and 355 nm). We investigated the optical, structural, topographical, and morphological properties of Gallium Nitride on the substrate PSi by various pulsed laser wavelengths. The X-Ray Diffraction (XRD) analysis revealed that gallium nitride on PSi was polycrystalline and hexagonal, cubic structural at 532 nm, with a high peak intensity and crystallite size at 2θ=36.96°and 57.80 related to (101) and (110) planes, respectively, while the c-GaN phase is observed at 2θ = 25.43 degrees and is reflected from the (200) plane. PL shows two emission peaks were observed for the GaN film (430,345,413 nm) and the PSi substrate (867,891,876 nm), and the energy gap increased as the wavelength decreased. The field emission scanning electron microscopy (FESEM) pictures revealed that the synthetic sample had an average size of 24.45, 23.91, and 21.30 nm, and the nanoparticles appeared spherical and similar to cauliflower. The atomic force microscopy (AFM) results showed that the average roughness was 7.62, 10.64, and 13.62 nm, respectively, and it was observed the root mean square increased as a result of the uniform distribution of high-quality crystals and the excellent quality of the crystal structure. The UV-Visible (UV) results showed that the transmission decreased with a decrease in wavelength, and the absorption was inversely proportional to the transmission.

show abstract

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

Fakhri¹,

Salim²,

Sulaiman³

et al. 2023

Plasmonics

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Conductivity Modification of ZnO NRs Films via Gold Coating for Temperature Sensor Application

Cited by 9 publications

References 46 publications

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

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

Physical Investigations of GaN/Porous Silicon at Different Laser Wavelengths

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

Contact Info

Product

Resources

About