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A facile single-pot synthesis of WO3/AgCl composite with enhanced photocatalytic and photoelectrochemical performance under visible-light irradiation
摘要： In this work, a visible-light-driven WO3/AgCl composite photocatalyst was synthesized by a facile single-pot hydrothermal method using α-Ag2WO4 and HCl as precursors. A series of WO3/AgCl composite photocatalysts were synthesized with the addition of different amount (0.5, 1.0, 1.5 and 2.0 mL) of 2 M HCl solution to α-Ag2WO4. Afterwards, the photocatalytic abilities of the WO3/AgCl composite photocatalysts were investigated towards the photodegradation of Rhodamine B (RhB) under visible-light illumination. Results show that the WO3/AgCl composite exhibits an outstanding photocatalytic activity as compared with those pure WO3 and AgCl. This enhancement may be due to the fast charge separation efficiency of the photoexcited electron-holes pairs. However, among various composites, the WO3/AgCl composite obtained with the addition of 1 mL of HCl is found to display the highest photocatalytic activity. This optimized composite shows a complete degradation of RhB within 30 min. Furthermore, the WO3/AgCl composite has an excellent photostability. Finally, a possible photocatalytic degradation mechanism of RhB degradation using WO3/AgCl composite is also proposed. Therefore, these high photocatalytic activity and stability results reveal that the WO3/AgCl composite is a promising material for wastewater treatment and other environmental remediation applications.
关键词： Photodegradation,Visible-light,WO3/AgCl composite,Photocatalysis,Rhodamine B
更新于2025-09-19 17:15:36
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The optimization of surface morphology of Au nanoparticles on WO3 nanoflakes for plasmonic photoanode
摘要： Among many candidates for photoanode materials of photoelectrochemical (PEC) cell, nanostructured tungsten trioxide (WO3) is regarded as one of the most promising materials due to its superior electrical properties and adequate bandgap (~2.8eV) and band edge position. WO3 nanoflakes(WO3 NFs), which have merits on its high surface area and crystallinity, have been actively studied for this manner but solar-to-hydrogen (STH) efficiency of WO3 NFs based photoanode is still not sufficient both in light absorption and charge separation. Plasmon-induced enhancement using Au nanoparticles is excellent approach for both the efficiency of light absorption and charge separation of WO3. However, it still needs optimization on its amount, shape, coverage, and e.t.c. Here, we synthesized WO3 NFs by solvothermal growth and decorated gold nanoparticles on these nanoflakes by e-beam evaporation and rapid thermal annealing (RTA) process in a row. By this process, a large-area AuNPs/WO3 nanocomposite structure with various size, interparticle distance, and coverage of AuNPs were fabricated. These AuNPs/WO3 NFs type photoanode achieve high light absorption both in UV and visible range and consequently higher photocurrent density. The optimized AuNPs/WO3 nanocomposite photoanode exhibits 1.01mA/cm2 of photocurrent density, which is increased to 19.8% compared with bare WO3 nanoflakes. Field emission-scanning electron microscope(FE-SEM), X-ray Diffraction(XRD), UV-vis spectrometer analysis were measured to analyze the morphology and crystallinity and relationship between structure and PEC performance.
关键词： Au nanoparticles,WO3 nanoflakes,plasmonic photoanode,Au/WO3 hierarchical structure,LSPR
更新于2025-09-19 17:13:59
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Oxygen partial pressure dependent UV photodetector performance of WO3 sputtered thin films
摘要： The influence of oxygen partial pressure (pO2) on the ultra-violet (UV) photodetector performance of WO3 thin films was studied. Here, the thickness of the WO3 thin films decreased from 225 nm to 150 nm with increasing the pO2 from 5% to 20%. The crystallinity of WO3 films decreased at higher pO2. The XPS analysis confirmed that the WO3 film deposited at 10% of pO2 had the more oxygen vacancies. The grain size of WO3 films decreased at higher pO2 grown conditions owing to the fragmentation of the oxide formation through the plasma. From current-voltage (I-V) measurements of WO3/Ti device, the ohmic-contact implies the formation of the metal-semiconductor junction with very less barrier height (?B) and it helps to the trapping of generated electrons for potential photodetector. Due to the higher number of incoming photons, the photocurrent was found to be increased as the power density increases. Finally, the WO3 film deposited at 10% of pO2 exhibits the higher photocurrent and quick rising time and hence this optimized thin film is suitable for UV-A photodetector.
关键词： Response time,WO3 film,Detectivity,Oxygen partial pressure,Photocurrent
更新于2025-09-19 17:13:59
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Non-invasive prediction of lung cancer histological types through exhaled breath analysis by UV-irradiated electronic nose and GC/QTOF/MS
摘要： Lung cancer (LC) is one of the most lethal diseases from the last decades. Accurate diagnosis of LC histology could lead to the prescription of personalized medical treatment to the affected subjects, which could reduce the mortality rate. We present here an experimental study performed in the pulmonology units of three hospitals from Morocco to non-invasively detect LC and predict LC histology via the analysis of the volatile organic compounds (VOCs) emitted through breathing. Gas chromatography coupled to a quadrupole time-of-flight mass spectrometer (GC/QTOF/MS) employed to detect the breath VOCs, revealed 30 discriminative VOCs in the breath of healthy subjects and LC patients; among them, 4 unique of LC (non-small cell LC and small cell LC), as well as between two of the major subtypes of employed to characterize the overall composition of the collected breath samples, providing a non-small cell LC, namely squamous cell carcinoma (SCC) and adenocarcinoma (ADC). The satisfactory discrimination between the breath patterns of LC patients and healthy subjects. novel sensing technique in breath analysis, based on UV-irradiation of the gas sensors, was Importantly, the e-nose could further discriminate with high accuracy between the two types breath VOCs were found for the first time in the breath of LC patients, and could be used as new biomarkers for future LC diagnosis. Besides, an electronic nose (e-nose) system using a Keywords: Breath analysis, Lung cancer, Histology, GC/QTOF/MS, Electronic nose, UV- can provided an accurate mean for the non-invasive diagnosis of LC and LC histology. reported results prove that breath analysis with chemical gas sensors and analytical techniques irradiated WO3 sensors.
关键词： Lung cancer,Histology,UV-irradiated WO3 sensors,Electronic nose,Breath analysis,GC/QTOF/MS
更新于2025-09-19 17:13:59
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Visible-light-driven selective oxidation of methane to methanol on amorphous FeOOH coupled m-WO3
摘要： Direct conversion of methane into value-added fuels or chemicals under ambient conditions remains a great challenge. Constructing solar-energy-driven catalytic systems is considered as a promising strategy, but the conversion e?ciency and products selectivity are still low, especially for producing alcohol derivatives. Herein, to promote the photocatalytic activity of methane partial oxidation to methanol, a series of FeOOH/m-WO3 consisting of ordered mesoporous WO3 (m-WO3) and highly dispersed amorphous FeOOH were synthesized by using KIT-6 silica as hard template. The prepared FeOOH/m-WO3 catalysts exhibit dramatically improved visible-light catalytic activities toward selective oxidation methane into methanol in the presence of H2O2. A methane conversion rate of 238.6 μmol·g?1·h?1 is achieved over the optimal 1.98% FeOOH/m-WO3, which is 3 times higher than that of pristine m-WO3 (79.2 μmol·g?1·h?1). Moreover, a methanol production rate of 211.2 μmol·g?1·h?1 with a selectivity of 91.0% is obtained on the optimum catalyst under 4 h visible-light irradiation. Signi?cantly, the greatly improved methane conversion and methanol production can be attributed to e?cient electron migration from the conduction band of m-WO3 to highly dispersed FeOOH, evidenced by in-situ XPS analysis, transient photocurrent response and photoluminescence spectra. Furthermore, based on radicals trapping experiments and electron spin resonance (ESR) results, methane is primarily activated by photoholes accumulated on the valence band of m-WO3 to generate methyl radicals (·CH3) and the produced hydroxyl radicals (·OH) via decomposing H2O2 by photoelectrons on FeOOH surface are predominant oxidant for methanol generation. Desired methanol is selectively produced via radicals reaction between ·CH3 and ·OH.
关键词： WO3,Methane,Methanol,Visible-light-driven,Amorphous FeOOH
更新于2025-09-19 17:13:59
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Ultrasensitive Paper-Based Photoelectrochemical Sensing Platform Enabled by the Polar Charge Carriers-Created Electric Field
摘要： Efficient separation of electron-hole pairs is vitally crucial to enhancing the analytical performance of paper-based photoelectrochemical (PEC) bioanalysis. Herein, a simple but effective strategy is developed to modulate the effective separation of photogenerated electrons and holes via introducing a polar charge carriers-created (PCC) electric field induced by a classical perovskite ferroelectric BaTiO3 (BTO). By inserting it between the n-type WO3 nanoflakes and p-type Cu2O (WO3 nanoflakes/BTO/Cu2O), the photoelectrode is endowed with a renewable PCC electric field, as a sustaining driving force, to guarantee the realization of directional separation of charge carrier (DSCC) strategy in PEC bioanalysis. The enduring PCC electric field can attract the electrons of Cu2O and holes of WO3, respectively, thereby regulating the directional migration of charge carriers and achieving an enhanced PEC photocurrent for the ultrasensitive quantification based on the highly efficient separation of electron-hole pairs. Consequently, with respect to WO3 nanoflakes/Cu2O and WO3 nanoflakes photoelectrode, the polarized WO3 nanoflakes/BTO/Cu2O photoelectrode exhibits 1.7 and 10.9 times higher photocurrent density, respectively. Benefiting from this, the prominent photocurrent density is obtained which is extremely beneficial for enhancing the sensitivity of PEC bioanalysis. Ultimately, the ultrasensitive detection of model prostate specific antigen (PSA) is realized and presented a linear range of 0.1 pg/mL-50 ng/mL with the detection limitation of 0.036 pg/mL. This work provides the basis for understanding the role of the polarized electric field induced by ferroelectric in tuning the charge separation as well as insights on strategies for constructing high-performance paper-based PEC bioanalysis.
关键词： WO3,BaTiO3,PSA,photoelectrochemical,Cu2O,ferroelectric,bioanalysis
更新于2025-09-19 17:13:59
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Superior photoresponse MIS Schottky barrier diodes with nanoporous:Sna??WO <sub/>3</sub> films for ultraviolet photodetector application
摘要： Highly ordered nanoporous structure based MIS type photo-detector is a promising device for next-generation optoelectronic applications due to their excellent light absorption, better mechanical strength, low density with larger diffusion coefficient and charge accommodation ability. Here, we fabricated a highly sensitive MIS Schottky barrier diodes by sandwiching nanoporous:Sn-WO3 films as interfacial layer prepared by jet nebulizer spray pyrolysis technique. XRD confirmed the polycrystalline nature with monoclinic and orthorhombic phase of Sn-WO3 films, whose crystallite size gradually increased with Sn concentration. FE-SEM of Sn-WO3 composite films with 12 wt% of Sn exhibited unique surface morphology of nanoplate, nanowire and nanoporous-like structure. Optical band gap energy improved from 3.2 to 3.6 eV with Sn concentration. Establishing the nanoporous structure of Sn-WO3, we are the first to report on the photo-diode properties of Cu/nanoporous:Sn-WO3/p-Si diodes which recorded a positive photo-response with higher reverse saturation current under illumination. It is supported through enhanced detectivity of the interface layer with increasing Sn concentration. We have achieved an ultra-high responsivity of 5083.5 mA/W for the diode fabricated with 12 wt% of Sn, which is 154 times higher than pure WO3. The presence of nanoporous:Sn-WO3 layer in MIS diode recorded ~60% quantum efficiency making it ideal for the ultra-violet photo-detector application.
关键词： MIS Schottky barrier diodes,Sn-WO3,photo-detector,nanoporous,ultra-violet
更新于2025-09-19 17:13:59
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An <i>in situ</i> assembled WO <sub/>3</sub> a??TiO <sub/>2</sub> vertical heterojunction for enhanced Z-scheme photocatalytic activity
摘要： The face-to-face contact of a vertical heterojunction is beneficial to charge interaction in photocatalysis. However, constructing a vertical heterojunction with uncompromised redox ability still remains a challenge. Herein, we report the successful synthesis of a WO3–TiO2 vertical heterojunction via establishing an internal electric field across the interface. Experimental investigation and computational simulations reveal that strong electric coupling occurs at the WO3–TiO2 interface forming an internal electric field. The internal electric field induces a Z-scheme charge-carrier transfer through the heterojunction under light irradiation, which leads to effective charge separation and maintains high reaction potentials of charge-carriers. The improved photocatalytic activity of the WO3–TiO2 heterojunction is proved by enhanced generation of reactive oxygen species and accelerated Escherichia coli (E. coli) disinfection. This study provides new insights into understanding and designing Z-scheme heterogeneous photocatalysts.
关键词： vertical heterojunction,Z-scheme,E. coli disinfection,WO3–TiO2,reactive oxygen species,photocatalysis
更新于2025-09-19 17:13:59
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Laser induced thermochromism and reversible upconversion emission modulation of a novel WO3:Yb3+,Er3+ ceramic: dual-modal fingerprint acquisition application
摘要： The quick and accurate identity recognition can be obtained by the acquisition of fingerprints in the financial, telecommunication, transportation, education and medical fields. However, conventional fingerprint acquisition technologies have many problems such as the high background interference, low detection sensitivity and complicated operation. In this work, the reversible modulation of laser induced thermochromism and upconversion luminescence of a novel WO3:Yb3+,Er3+ ceramic was achieved even after several cycles, exhibiting excellent repeatability. For the first time, we realized the dual-modal fingerprint acquisition by means of the laser induced thermochromism and upconversion luminescence of WO3:Yb3+,Er3+ ceramic. Particularly, this method shows ultrahigh stability, preserving the fingerprint patterns as long as one year. The results demonstrated that our technology is nondestructive, repeatable, highly effective and stable, paving the way for the development of the acquisition and storage of fingerprints.
关键词： Photo-thermal-chromism,Upconversion luminescence,WO3:Yb3+,Er3+ ceramics,Fingerprint acquisition
更新于2025-09-19 17:13:59
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WO3 processed by direct laser interference patterning for NO2 detection
摘要： In this paper two kind of sensors based on WO3 sputtered by magnetron sputtering and annealed at 600°C have been studied. The first kind was processed by two-dimensional direct laser interfering patterning (DLIP) and the second one without any additional treatment. Morphological and structural characterization have shown a hole structure in a periodic line-pattern for the DLIP-processed sensors and a flat surface for the only-annealed sensors, both with a tetragonal WO3 phase. TOF-SIMS analysis has revealed that the first WO3 layers are reduced for both samples, which could improve sensing performance. Promising response enhancement of DLIP-processed sensors has been observed for low concentrations of NO2 (from 0.5 ppm to 5 ppm) at 200°C, lowering the limit of detection (LOD) to 10 ppb, half of the LOD of the only-annealed sensors (20 ppb). Cross sensitivity to CO and HCHO have been investigated and the sensing mechanisms discussed.
关键词： Arrhenius,WO3,NO2,TOF-SIMS,tetragonal phase,DLIP
更新于2025-09-16 10:30:52