Preparation of hexagonal nanoporous Al2O3/TiO2/TiN as a novel photodetector with high efficiency

Elsayed, Asmaa M.; Rabia, Mohamed; Shaban, Mohamed; Aly, Arafa H.; Ahmed, Ashour M.

doi:10.1038/s41598-021-96200-2

Cited by 63 publications

(42 citation statements)

References 73 publications

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“…This suggests that the nanocomposite formation increases the crystallinity of the PANI. The average crystallite sizes are calculated using Scherrer's equation based on the full width at half maximum (W in radians), D = 0.9 λ/W cos θ [37][38][39][40][41], where λ and θ are the X-ray wavelength (CuK α = 0.15405 nm) and diffraction angle, respectively. By using this equation, the average crystallite size is 24.7 nm for the PANI and increases to 43.4 nm for the PANI/PbS nanocomposite.…”

Section: Xrd Analysismentioning

confidence: 99%

Facile Fabrication of Polyaniline/Pbs Nanocomposite for High-Performance Supercapacitor Application

et al. 2022

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In this work, a polyaniline/lead sulfide (PANI/PbS) nanocomposite was prepared by combining the in situ oxidation polymerization method and the surface adsorption process. This nanocomposite was applied as a supercapacitor electrode. The crystal structure, nanomorphology, and optical analysis of PANI and PANI/PbS were investigated. The electrochemical performance of the designed PANI/PbS electrode-based supercapacitor was tested by using cyclic voltammetry (CV), chronopotentiometry (CP), and AC impedance techniques in HCl and Na2SO4 electrolytes. The average crystallite size of the PANI/PbS nanocomposite is about 43 nm. PANI/PbS possesses an agglomerated network related to PANI with additional spherical shapes from PbS nanoparticles. After the PANI/PbS nanocomposite formation, there are enhancements in their absorption intensities. At a current density of 0.4 A g−1, the specific capacitance of PANI/PbS in Na2SO4 and HCl was found to be 303 and 625 F g−1, respectively. In HCl (625 F g−1 and 1500 mF cm−2), the gravimetric and areal capacitances of the PANI/PbS electrode are nearly double those of the Na2SO4 electrolyte. Also, the average specific energy and specific power density values for the PANI/PbS electrode in HCl are 4.168 Wh kg−1 and 196.03 W kg−1, respectively. After 5000 cycles, the capacitance loses only 4.5% of its initial value. The results refer to the high stability and good performance of the designed PANI/PbS as a supercapacitor electrode.

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Section: Xrd Analysismentioning

confidence: 99%

Facile Fabrication of Polyaniline/Pbs Nanocomposite for High-Performance Supercapacitor Application

et al. 2022

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“…The Na metal inside CdS crystal forms localized states in the bandgap, hence the increase of the number of electrons transferred from the lower to the higher energy states. The final number of electrons collected on the surface of Na‐CdS represents the J ph values, in which the R , D , and EQE are calculated 53 …”

Section: Resultsmentioning

confidence: 99%

“…The final number of electrons collected on the surface of Na-CdS represents the J ph values, in which the R, D, and EQE are calculated. 53…”

Section: Mechanismmentioning

confidence: 99%

The efficiency of M (M = Li, Na, or Cs) doped CdS nanomaterials in optoelectronic applications

Awad

Shaban

Rabia

2022

Intl J of Energy Research

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Summary A novel Cu/Na‐CdS optoelectronic photodetector is prepared and applied for detecting the light in the UV and Vis regions with high efficiency. First, CdS and M‐CdS nanomaterials (M = Li, Na, or Cs) are prepared using the hydrothermal method at 180°C for 24 hours. The prepared nanomaterials have crystalline structures that are confirmed through X‐ray diffraction analyses. Na‐CdS has the optimum structure with a crystalline size of 17.5 nm and porous structure looks small grass. Moreover, Na‐CdS has the optimum optical absorbance and bandgap of 1.78 eV. Na‐CdS nanomaterial is applied as optoelectronic material for light detection under different intensities and wavelengths. The device detected the light in the UV and Vis regions with high efficiency. The current density (Jph) values increased highly in light in compared with dark conditions, in which Jph changed from 20 μA cm−2 to 2.88 mA cm−2 in dark and light, respectively. The detectivity (D) and photoresponsivity (R) were 1.5 × 1010 Jones and 38 mA W−1, respectively. Also, the external quantum efficiency (EQE) was 12% at 390 nm and 100 mW cm−2. The high properties of Na‐CdS optoelectronic qualify it to be applicable in the industrial field incorporated with high technology devices such as cameras and spacecraft.

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“…On the other hand, the temperature has the same effect on the electrode after Au coating, Au/TiN/TiO 2 /Al 2 O 3 , as shown in Figure 8 b. in which the J ph value increases from 0.13 to 0.33 mA·cm −2 with increasing the temperature from 30 to 70 °C, respectively. The general increases in J ph values represent the reaction rate, which reflects the H 2 and O 2 production rate [ 51 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

Nanoporous TiN/TiO2/Alumina Membrane for Photoelectrochemical Hydrogen Production from Sewage Water

et al. 2021

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An aluminum oxide, Al2O3, template is prepared using a novel Ni imprinting method with high hexagonal pore accuracy and order. The pore diameter after the widening process is about 320 nm. TiO2 layer is deposited inside the template using atomic layer deposition (ALD) followed by the deposition of 6 nm TiN thin film over the TiO2 using a direct current (DC) sputtering unit. The prepared nanotubular TiN/TiO2/Al2O3 was fully characterized using different analytical tools such as X-ray diffraction (XRD), Energy-dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM), and optical UV-Vis spectroscopy. Exploring the current-voltage relationships under different light intensities, wavelengths, and temperatures was used to investigate the electrode’s application before and after Au coating for H2 production from sewage water splitting without the use of any sacrificing agents. All thermodynamic parameters were determined, as well as quantum efficiency (QE) and incident photon to current conversion efficiency (IPCE). The QE was 0.25% and 0.34% at 400 mW·cm−2 for the photoelectrode before and after Au coating, respectively. Also, the activation energy was 27.22 and 18.84 kJ·mol−1, the enthalpy was 24.26 and 15.77 J·mol−1, and the entropy was 238.1 and 211.5 kJ−1·mol−1 before and after Au coating, respectively. Because of its high stability and low cost, the prepared photoelectrode may be suitable for industrial applications.

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Preparation of hexagonal nanoporous Al2O3/TiO2/TiN as a novel photodetector with high efficiency

Cited by 63 publications

References 73 publications

Facile Fabrication of Polyaniline/Pbs Nanocomposite for High-Performance Supercapacitor Application

Facile Fabrication of Polyaniline/Pbs Nanocomposite for High-Performance Supercapacitor Application

The efficiency of M (M = Li, Na, or Cs) doped CdS nanomaterials in optoelectronic applications

Nanoporous TiN/TiO2/Alumina Membrane for Photoelectrochemical Hydrogen Production from Sewage Water

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