Synthesis of Tribological WS2 Powder from WO3 Prepared by Ultrasonic Spray Pyrolysis (USP)

Gajić, Nataša; Kamberović, Željko; Anđić, Zoran; Trpčevská, Jarmila; Plešingerová, Beatrice; Korać, Marija

doi:10.3390/met9030277

Cited by 16 publications

(8 citation statements)

References 23 publications

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“…For PA3, the peak intensities of W x S 1– x (002) and W x S 1– x (006) are stronger than those of the PA1 and the PA2. The FWHMs of the W x S 1– x (002) peak for PA1, PA2, and PA3 were calculated as 7.20, 7.08, and 6.81, respectively, which were broader than those of previous reports. , This broad line-width indicates that the amorphous W x S 1– x with sulfur vacancies was formed on a GaN NW. According to previous reports, sulfur vacancies increased with increasing line width of XRD rocking curves of W x S 1– x (002) and W x S 1– x (006). − High-resolution XPS was employed to observe how tungsten (W) and sulfur (S) atoms were combined on the GaN NWs.…”

Section: Results and Discussionmentioning

confidence: 56%

“…The FWHMs of the W x S 1−x (002) peak for PA1, PA2, and PA3 were calculated as 7.20, 7.08, and 6.81, respectively, which were broader than those of previous reports. 40,41 This broad line-width indicates that the amorphous W x S 1−x with sulfur vacancies was formed on a GaN NW. According to previous reports, sulfur vacancies increased with increasing line width of XRD rocking curves of W x S 1−x (002) and W x S 1−x (006).…”

Section: Methodsmentioning

confidence: 99%

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Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

Han

Noh

et al. 2020

ACS Appl. Mater. Interfaces

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In the present study, we have achieved high-performance photoelectrochemical water splitting (PEC-WS) using GaN nanowires (NWs) coated with tungsten sulfide (W x S 1−x ) (GaN-NW-W x S 1−x ) as a photoanode. The measured current density and applied-bias photon-to-current efficiency were 20.38 mA/cm 2 and 13.76%, respectively. These values were much higher than those reported previously for photoanodes with any kind of III-nitride nanostructure. The amount of hydrogen gas formed was 1.01 mmol/cm 2 from 7 h PEC-WS, which was also much higher than the previously reported values. The drastic improvement in the PEC-WS performance using the GaN-NW-W x S 1−x photoanode was attributed to an increase in the number of photogenerated carriers due to the highly crystalline GaN NWs, and acceleration of separation of photogenerated carriers and consequent suppression of charge recombination because of nitrogen-terminated surfaces of NWs, sulfur vacancies in W x S 1−x , and type-II band alignment between NW and W x S 1−x . The degree of impedance matching, evaluated from Nyquist plots, was considered to analyze charge transfer characteristics at the interface between the GaN-NW-W x S 1−x photoanode and 0.5-M H 2 SO 4 electrolyte. Considering the material system and scheme for the PEC-WS, our approach provides an efficient way to improve hydrogen evolution reaction.

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Section: Results and Discussionmentioning

confidence: 56%

Section: Methodsmentioning

confidence: 99%

Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

Han

Noh

et al. 2020

ACS Appl. Mater. Interfaces

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“…43-1035) of WO 3 . , All the pyrolyzed samples exhibited peaks of both WS 2 and W 18 O 49 and are well in agreement with ICDD Nos. 05-0393 and 84-1398. − However, after pyrolysis of WO 3 using the sulfur source, WO 3 was not completely converted into WS 2 , instead a heterojunction of WS 2 /W 18 O 49 was formed.…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Room Temperature Detection of NH₃ and NO_x Using Oxygen-Deficient W₁₈O₄₉-Supported WS₂ Heterojunctions

Manoharan

Govindharaj

Muthumalai

et al. 2023

ACS Appl. Mater. Interfaces

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In this paper, we reported the controlled synthesis of tungsten disulfide/reduced tungsten oxide (WS 2 /W 18 O 49 ) heterojunctions for highly efficient room temperature NO x and ammonia (NH 3 ) sensors. X-ray diffraction analysis revealed the formation of the oxygen-deficient W 18 O 49 phase along with WS 2 . Field-emission scanning electron microscopy and transmission electron microscopy displayed the formation of WS 2 flakes over W 18 O 49 nanorods. X-ray photoelectron spectroscopy showed the presence of tungsten in W 4+ , W 5+ , and W 6+ oxidation states corresponding to WS 2 and W 18 O 49 , respectively. The WS 2 /W 18 O 49 heterojunction sensor exhibited sub-ppm level sensitivity to NO x and NH 3 at room temperature. The heterojunction sensor detected 0.6 ppm NO x and 0.5 ppm NH 3 , with a corresponding response of 7.1 and 3.8%, respectively. The limit of detection of the sensor was calculated to be 0.05 and 0.17 ppm for NH 3 and NO x , respectively. The cyclic stability test showed that the sensor exhibited high stability even after 24 cycles for the detection of NH 3 and 14 cycles for NO x . Compared to pristine WO 3 and WS 2 , the WS 2 / W 18 O 49 heterojunction showed high selectivity toward NO x and NH 3 . The results could be useful for the development of room temperature NO x and NH 3 sensors.

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“…Finally, the thin WS 2 nanosheets would be self‐assembled and corrugated into flower shape due to the reducing surface energy. [ 39 ] According to the previous work, the formation of flower shape WS 2 involves the following suggested chemical reactions: [ 33,34b,39,40 ]

{CSN}_{2} H_{4} + 2 H_{2} O \to 2 {NH}_{3} + {CO}_{2} + H_{2} S

{({NH}_{4})}_{6} H_{2} W_{12} O_{40} \to 6 {NH}_{3} + 12 {WO}_{3} + 4 H_{2} O

{WO}_{3} + 3 H_{2} S + H_{2} O \to {WO}_{2} + {SO}_{4}^{2 -} + 2 H^{+}

{WO}_{2} + 2 H_{2} S \to {WS}_{2} + 2 H_{2} O

…”

Section: Resultsmentioning

confidence: 99%

Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg²⁺ Ions

Rahman

Maruf

Faisal

et al. 2020

Advanced Sustainable Systems

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Electrochemical sensors for mercury ion detection would ideally demonstrate wide linear detection ranges (LDRs), ultratrace sensitivity, and high selectivity. This work presents an electrochemical sensor based on metallic 1T phase tungsten disulfide (WS2) microflowers for the detection of trace levels of Hg2+ ions with wide LDRs, ultratrace sensitivity, and high selectivity. Under optimized conditions, the sensor shows excellent sensitivities for Hg2+ with LDRs of 1 nm–1 µm and 0.1–1 mm. In addition to this, the limit of detection of the sensor toward Hg2+ is 0.0798 nm or 79.8 pm, which is well below the guideline value recommended by the World Health Organization. The sensor exhibits excellent selectivity for Hg2+ against other heavy metal ions including Cu2+, Fe3+, Ni2+, Pb2+, Cr3+, K+, Na+, Ag+, Sn2+, and Cd2+. The thus‐obtained excellent sensitivity and selectivity with wide LDRs can be attributed to the high conductivity, large surface area microflower structured 1T‐WS2, and the complexation of Hg2+ ions with S2−. In addition to good repeatability, reproducibility, and stability, this sensor shows the practical feasibility of Hg2+ detection in tap water suggesting a promising device for real applications.

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Synthesis of Tribological WS2 Powder from WO3 Prepared by Ultrasonic Spray Pyrolysis (USP)

Cited by 16 publications

References 23 publications

Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

Highly Selective Room Temperature Detection of NH₃ and NO_x Using Oxygen-Deficient W₁₈O₄₉-Supported WS₂ Heterojunctions

Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg²⁺ Ions

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Synthesis of Tribological WS2 Powder from WO3 Prepared by Ultrasonic Spray Pyrolysis (USP)

Cited by 16 publications

References 23 publications

Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

Highly Selective Room Temperature Detection of NH3 and NOx Using Oxygen-Deficient W18O49-Supported WS2 Heterojunctions

Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg2+ Ions

Contact Info

Product

Resources

About

Highly Selective Room Temperature Detection of NH₃ and NO_x Using Oxygen-Deficient W₁₈O₄₉-Supported WS₂ Heterojunctions

Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg²⁺ Ions