Modulated Binary–Ternary Dual Semiconductor Heterostructures

Prusty, Gyanaranjan; Guria, Amit K.; Mondal, Indranil; Dutta, Anirban; Pal, Ujjwal; Pradhan, Narayan

doi:10.1002/anie.201509701

Cited by 35 publications

(32 citation statements)

References 51 publications

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“…Figure shows the schematic presentation of the reactions and observed products in absence and in presence of Au(III) ions using the Ag 2 S seeds. In the absence of Au(III), among the four heterovalent cations chosen, Zn(II) led to superionic conductor catalytic growth forming Ag 2 S‐ZnS, and In(III) (or Ga III ) formed Ag 2 S‐AgIn(or Ga)S 2 heterostructures via partial ion exchange . Cd(II) is also expected to follow the catalytic growth like ZnS on Ag 2 S seeds; but in our reaction condition, the catalytic growth is followed by ion exchange leading to tadpole‐shaped CdS nanostructures.…”

Section: Resultsmentioning

confidence: 87%

“…Among these seeded growths with binary seed nanocrystals with monovalent cations, Ag(I) chalcogenides and Cu(I) sulfides were more vulnerable. These could also follow multiple mechanistic pathways in designing different binary to ternary nano‐heterostructures . These form ternary I‐III‐VI nanostructures with In(III) and/or Ga(III) ion diffusions .…”

Section: Introductionmentioning

confidence: 99%

“…These could also follow multiple mechanistic pathways in designing different binary to ternary nano‐heterostructures . These form ternary I‐III‐VI nanostructures with In(III) and/or Ga(III) ion diffusions . Similarly, with Cd(II) and/or Zn(II), these lead to heterostructures by both diffusion as well as cation exchange or superionic conductor catalytic growths .…”

Section: Introductionmentioning

confidence: 99%

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Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

Sahu

Prusty

Guria

et al. 2018

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For efficient charge separations, multimaterial hetero-nanostructures are being extensively studied as photocatalysts. While materials with one heterojunction are widely established, the chemistry of formation of multijunction heterostructures is not explored. This needs a more sophisticated approach and modulations. To achieve these, a generic multistep seed mediated growth following controlled ion diffusion and ion exchange is reported which successfully leads to triple-material hetero-nanostructures with bimetallic-binary alloy-binary/ternary semiconductors arrangements. Ag S nanocrystals are used as primary seeds for obtaining AuAg-AuAgS bimetallic-binary alloyed metal-semiconductor heterostructures via partial reduction of Ag(I) using Au(III) ions. These are again explored as secondary seeds for obtaining a series of triple-materials heterostructures, AuAg-AuAgS-CdS (or ZnS or AgInS ), with introduction of different divalent and trivalent ions. Chemistry of each step of the gold ion-induced changes in the rate of diffusion and/or ion exchanges are investigated and the formation mechanism for these nearly monodisperse triple material heterostructures are proposed. Reactions without gold are also performed, and the change in the reaction chemistry and growth mechanism in presence of Au is also discussed.

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Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

Sahu

Prusty

Guria

et al. 2018

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“…S12) It is well known that, the electron-hole pair recombination of photocatalyst could give rise to PL emission. Hence, the PL emission spectra (excited at 365 nm) of WO 3 , CZ 0.15 S, and CZ 0.15 S-0.08W were measured to study their separation abilities for charge carriers, as the latter was a critical factor determining the photocatalytic efficiency [59]. As exhibited in Fig.…”

Section: Resultsmentioning

confidence: 99%

Unique Cd1−xZnxS@WO3−x and Cd1−xZnxS@WO3−x/CoOx/NiOx Z-scheme photocatalysts for efficient visible-light-induced H2 evolution

Ruan

Lin

et al. 2019

Sci. China Mater.

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Artificial Z-scheme photocatalytic systems have received considerable attention in recent years because they can achieve wide light-absorption, high charge-separation efficiency, and strong redox ability simultaneously. Nevertheless, it is still challenging to exploit low-cost and stable Zscheme photocatalysts with highly-efficient H 2 evolution from solar water-splitting so far. Herein, we report a novel all-solidstate Z-scheme photocatalyst Cd 1−x Zn x S@WO 3−x consisting of Cd 1−x Zn x S nanorods coated with oxygen-deficient WO 3−x amorphous layers. The Cd 1−x Zn x S@WO 3−x exhibits an outstanding H 2 evolution reaction (HER) activity as compared with Pt-loaded Cd 1−x Zn x S and most WO 3-and CdS-based photocatalysts, due to the generation of stronger reducing electrons through the appropriate Zn-doping in Cd 1−x Zn x S and the enhanced charge transfer by introducing oxygen vacancies (W 5+ /OVs) into the ultrathin WO 3−x amorphous coatings. The optimal HER rate of Cd 1−x Zn x S@WO 3−x is determined to be 21.68 mmol h −1 g −1 , which is further raised up to 28.25 mmol h −1 g −1 (about 12 times more than that of Pt/Cd 1−x Zn x S) when Cd 1−x Zn x S@WO 3−x is hybridized by CoO x and NiO x dual cocatalysts (Cd 1−x Zn x S@WO 3−x /CoO x /NiO x) through in-situ photo-deposition. Moreover, the corresponding apparent quantum yield (AQY) at 420 nm is significantly increased from 34.6% for Cd 1−x Zn x S@WO 3−x to 60.8% for Cd 1−x Zn x S@WO 3−x /CoO x /NiO x. In addition, both Cd 1−x Zn x-S@WO 3−x and Cd 1−x Zn x S@WO 3−x /CoO x /NiO x demonstrate good stability towards HER. The results displayed in this work will inspire the rational design and synthesis of high-performance nanostructures for photocatalytic applications. Keywords: Z-scheme charge transfer, photocatalytic H 2 evolution , Cd 1−x Zn x S solid solutions, oxygen-deficient WO 3−x amorphous layers, CoO x and NiO x dual cocatalysts

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“…To our knowledge, preparation of binary‐semiconductors heterostructure is an effective route to promote the catalytic properties of catalysts since the excellent interfacial heterostructure can significantly boost the separation rate of the photoproduced charge in the catalytic procedure . Recently, transition metal dichalcogenides (TMDs) is considered to be the outstanding materials for high‐performance photocatalysts since their excellent chemical and physical properties .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Interfacial Charge Transfer and Separation Rate based on Sub 10 nm MoS₂ Nanoflakes In Situ Grown on Graphitic‐C₃N₄

Qian

Cui

et al. 2019

Adv Materials Inter

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Herein, sub 10 nm MoS2 nanoflakes are successfully in situ grown on graphitic‐carbon‐nitride (MoS2/g‐C3N4) through a hydrothermal strategy. The scanning electron microscopy result indicates that the thickness of the MoS2 nanoflakes is less than 10 nm, which can boost the transport rate of the photoproduced charge during the photodegradation process. Transmission electron microscopy result clearly shows that an excellent interfacial heterojunction is formed between g‐C3N4 and MoS2, which will significantly improve the stability of catalysts. Particularly, the optimal 8% MoS2/g‐C3N4 product displays significantly enhance catalytic performance and excellent long‐term photodurability. These superior photocatalytic properties are attributed to the excellent interfacial heterostructure between MoS2 and g‐C3N4, which extends the visible light absorption range, suppresses the recombination, and improves the transfer rate of photoproduced charge.

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Modulated Binary–Ternary Dual Semiconductor Heterostructures

Cited by 35 publications

References 51 publications

Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

Unique Cd1−xZnxS@WO3−x and Cd1−xZnxS@WO3−x/CoOx/NiOx Z-scheme photocatalysts for efficient visible-light-induced H2 evolution

Enhanced Interfacial Charge Transfer and Separation Rate based on Sub 10 nm MoS₂ Nanoflakes In Situ Grown on Graphitic‐C₃N₄

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Modulated Binary–Ternary Dual Semiconductor Heterostructures

Cited by 35 publications

References 51 publications

Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

Unique Cd1−xZnxS@WO3−x and Cd1−xZnxS@WO3−x/CoOx/NiOx Z-scheme photocatalysts for efficient visible-light-induced H2 evolution

Enhanced Interfacial Charge Transfer and Separation Rate based on Sub 10 nm MoS2 Nanoflakes In Situ Grown on Graphitic‐C3N4

Contact Info

Product

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About

Enhanced Interfacial Charge Transfer and Separation Rate based on Sub 10 nm MoS₂ Nanoflakes In Situ Grown on Graphitic‐C₃N₄