Formation of iron oxide nanoparticles for the photooxidation of …
The energy corresponding to the direct band decreases with particle size from 2.26 to 2.14 eV and are in good agreement with literature values of hematite thin films which range from 1.95 to 2.35 ...
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Ultrathin Hematite‐Hercynite Films for Future Unassisted …
The average thickness of the hematite thin films was also calculated to be 223 ± 10 nm using light absorbance. However, the thickness of the resulting hematite top layer for the hematite-hercynite photoelectrodes cannot be measured in this way due to the presence of hercynite. ... The achieved aluminum film concentration compared to the …
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Post-annealing of hematite films: The changes in surface …
Hematite films were grown by the EA-LPD method reported by Parveh [25] et al. ... (OER activity) and the charge carrier concentration. Since, the post-annealing process has been performed at 350 °C, the created oxygen vacancies are present in the regions close to the surface. Such vacancies do not have the chance to diffuse into the …
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Facile fabrication of P-type hematite thin film and …
The morphology of the hematite film prepared by DA method are investigated by SEM and shown in Fig. 1.Hematite particles are loaded along with surface roughness of fluorine doped tin oxide substrate, forming hematite thin layer (Fig. 1 (a)).Each hematite thin layer showed differences in optical image along with dopants are doped in. Ti doped …
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Sn-Doped Hematite for Photoelectrochemical Water
Abstract Hematite-based photoanodes have been intensively studied for photoelectrochemical water oxidation. The n-type dopant Sn has been shown to benefit the activity of hematite anodes. We demonstrate in this study that Sn-doped hematite thin films grown by atomic layer deposition can achieve uniform doping across the film …
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Oxygen vacancy modulation of hematite thin films using …
CPE 1 is the capacitance of hematite film, and CPE 2 represents the capacitance between hematite and electrolyte [28]. ... In this process, the charge carrier …
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The Influence of Magnetic Field and Nanoparticle …
The Influence of Magnetic Field and Nanoparticle Concentration on the Thin Film Colloidal Deposition Process of Magnetic Nanoparticles: The Search for High …
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FT-IR, XPS and PEC characterization of spray deposited hematite thin films
The thin films of hematite have been investigated for their sensing properties for oxidizing/reducing gases, alcohol [5] and humidity [6]. The sensitivity of the hematite towards the gases can be improved with its nanometric form. It is a weakly ferromagnetic at room temperature. ... The solution concentration used was 0.11 ...
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A novel method for controlled synthesis of nanosized hematite …
The above experiment was repeated in order to observe the effect of NH3 vapor concentration on the film morphology. The films were formed by using 4%, 6%, and 8% volume of NH3 in the reaction chamber. ... (2007) Enhancement of photoelectrochemical hydrogen production from hematite thin films by the introduction of Ti and Si. J Phys …
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The Structural Properties and Photoelectrocatalytic Response …
The concept of nanostructuring and doping of hematite (α-Fe 2 O 3) photoanodes have been widely engaged towards improving their photoelectrocatalytic (PEC) response.Here, a FeCl 3-based solution was modified with 0–10 % polyethylene glycol (PEG) 400 and used as an electrolyte for the electrodeposition of nanostructured …
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Facile preparation of Zn-doped hematite thin film as …
Section snippets Experiments. An ethanolic iron chloride (FeCl 3) solution with a concentration of 40 mM was prepared by dissolving FeCl 3 ·6H 2 O (99%, Fisher Scientific) in ethanol. Fluorine-doped tin oxide (FTO) coated glass as the substrate was cleaned sequentially by acetone, ethanol and water prior to the deposition of the …
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Enhanced photoelectrochemical water splitting via SILAR …
An optimum Ti concentration of 4.2% in the film doubled overall charge separation efficiency to 20% compared to undoped hematite by enhancing band bending. With Ti, carriers generated within 3 nm of the depletion region were separated with near-unity efficiency. Moreover, Ti improved interfacial hole transfer efficiency from <3% to …
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c-In2O3/α-Fe2O3 heterojunction photoanodes for water …
The morphologies of hematite films synthesized via thermal oxidation correspond to the heating temperature [].In this work, heating the metal films at 400 °C for 5 h produced oxide films with featured morphologies as shown in Fig. 1.The pure hematite film (Fig. 1a) is composed of dense nanoparticles with diameter of ~180 nm. Such …
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Post-Excitation Transient IR Phenomena in α-Fe2O3 Films
This indicates a connection between the intensity of peak 1 and charge concentration in the hematite film. Furthermore, it indicates that the distortion …
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Sn Doping into Hematite Nanorods for High-Performance
The films were dried in the air to dry the solution on the film. Dried films were heated in air at 550°C with the ramping rate of 8.75°C min −1 for 2 h to form hematite. Then, the film was annealed in Ar at 750°C with ramping rate of …
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Tuning of oxygen vacancy-induced electrical conductivity in …
Therefore, the Ti-doped hematite films are n-type in nature and the value of Seebeck coefficient indicates a doped semiconductor with high carrier concentration. …
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The effects of applied current density and bath concentration …
Hematite films with finer morphologies are formed as the applied current density and bath concentration increases in their respective appropriate ranges (1–4 mA cm −2 and 10–20 mM, respectively). Such behavior has been also reported previously in the case of potentiostatic or galvanostatic electrodeposition of hematite films from …
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Critical role and modification of surface states in hematite …
Hematite films deposited by plasma-enhanced chemical vapor deposition of iron pentacarbonyl [Fe(CO)5] in an oxygen plasma were modified by postdeposition (i) …
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Ultrathin Hematite‐Hercynite Films for Future Unassisted …
The low intensity of hematite peaks indicates its low concentration or film thickness compared to the hercynite phase. The two additional peaks at 30.6° and 32° …
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Critical role and modification of surface states in hematite films …
Hematite films deposited by plasma-enhanced chemical vapor deposition of iron pentacarbonyl [Fe(CO)5] in an oxygen plasma were modified by postdeposition (i) oxygen plasma treatment and (ii) short annealing treatments to reduce the defects and to modify the (sub)surface states and consequently the photoelectrochemical properties. …
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Thermal Oxidation Preparation of Doped Hematite Thin Films …
The photocurrent density-voltage characterization illustrated that the nanoflake films of Sn-doped hematite exhibited high PEC performance and the Sn concentration was optimized about 5%. The doped Ge 4+ ions were proposed to occupy the empty octahedral holes and their effect on PEC performance of hematite is smaller …
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DOI: 10.1002/((please add manuscript number)) Article …
hematite films synthesized from solutions containing various glucose concentrations. The mesoporous samples prepared from 0.03 M, 0.07 M and 0.10 M glucose aqueous solutions are
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The molecular insights into protein adsorption on hematite …
The hematite thin-film deposited on ZnSe crystal was initially equilibrated with the background solution for ~ 2 h, and then a background spectrum containing the absorbance of: the the hematite ...
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Sn-Doped Hematite for Photoelectrochemical Water …
Hematite-based photoanodes have been intensively studied for photoelectrochemical water oxidation. The n -type dopant Sn has been shown to benefit the activity of hematite anodes. We demonstrate in this study that Sn-doped hematite thin films grown by atomic layer deposition can achieve uniform doping across the film thickness up to at least 32 …
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Effects of Annealing on Structural, Morphological, and …
Hematite (Fe2O3) thin films have been synthesized on indium tin oxide (ITO)-coated glass substrate using an electrodeposition technique and the changes in their structure due to subsequent annealing at different temperatures investigated. The structural, optical, and morphological properties of Fe2O3 thin films formed after annealing at …
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CVD Growth of Hematite Thin Films for …
1. Introduction. Hematite is an attractive semiconductor material for photoelectrochemical and photocatalytic purposes due to its stability, abundance, and environmental compatibility, as well as its suitable bandgap and valence band edge position [1,2,3].Moreover, this oxide shows a high potential for commercial application in water …
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Tuning of opto-electrical properties of hematite thin films …
Hematite thin films have attracted widespread interest in recent years because of their advanced electronic and optical properties. Optical and electronic …
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Characterization of Zn-doped hematite thin films for
the PEC study on Zn-doped a-Fe203 thin films pre pared by spray pyrolytic method at different doping concentrations (0.5, 1.0,1.5, 5.0 and 10.0 at%). Photo current density was found to depend upon the doping concentration of Zn. Maximum photocurrent density of -0.64 mA cm-2 at an applied potential of 0.7 V/SCE was observed for 5.0 at% doping ...
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Ultrathin Hematite Photoanode with Gradient Ti Doping
Herein, we synthesized ultrathin hematite photoanode via a layer-by-layer polymer-assisted deposition (PAD) method. Each layer of hematite is around 30 nm in thickness with different Ti-doping level, as shown in Figure 1.The built-in electric field, due to the gradient Ti concentration to distribute the band bending over the bulk of the …
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Spray pyrolytically deposited nanoporous Ti4+ doped hematite thin films …
Nanostructured thin films of hematite doped with Ti 4+ ions at different doping concentrations were prepared by spray pyrolysis. Scanning electron microscopy has been employed to see any change in the morphology of the film with the doping concentration. Doping of Ti in hematite has been observed to modify the morphology …
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