Selective Placement of Faceted Metal Tips on Semiconductor Nanorods

Schlicke, Hendrik; Ghosh, Debanjan; Fong, Lam-Kiu; Xin, Huolin L.; Zheng, Haimei; Alivisatos, A. Paul

doi:10.1002/ange.201205958

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…The aforementioned reasons will together make the relatively inert Ag + ions (from the Ag− thiolate complex) preferably react with Bi 2 S 3 NRs at their two highly reactive termini to form AgBiS 2 , whereas these factors try their best to prevent the middle lateral surface of NRs from the Bi 3+ and Ag + exchange reaction and consequently suppress the formation of core@shell structured NR intermediates. 24,25 By contrast, the discrepancy in reactivity between two opposite end points of [001]-grown Bi 2 S 3 NRs is very small, because Bi and S dangling bonds can concurrently appear on the (001) planes (Figure 6b,c), unlike the large difference in reactivity that exists between cation Cd-terminated (0001) and anion S-terminated (000−1) polar facets in CdS NRs for the affixation of metal tips 43 or Cd 2+ and Cu + exchange. 44 This leads to the preferable formation of AgBiS 2 −Bi 2 S 3 −AgBiS 2 NR heterostructures (Figure 5), rather than Bi 2 S 3 −AgBiS 2 NR heterostructures.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Binary–Ternary Bi₂S₃–AgBiS₂ Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Wang

et al. 2019

Inorg. Chem.

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Nanoscale chemical transformations based on partial cation exchange reactions are known as a componentincreased, shape-maintaining means for the design and tunable preparation of ternary or multinary metal chalcogenide compounds. Herein, we present a new material couple, Bi 2 S 3 −AgBiS 2 , to detail the binary−ternary chemical transformation via partial cation exchange and its reaction thermodynamics and kinetics. The preformed Bi 2 S 3 nanorods (NRs) act as both the reactant and the parent template, within which the partial exchange of Bi 3+ with Ag + cations proceeds under a silver-rich, diffusion-controlled regime, leading to the formation of energetically favorable AgBiS 2 . The NR shape preservation involving sulfur sublattice rearrangement is due to the proper diameter thickness (∼12 nm) of parent Bi 2 S 3 NRs and the rapid establishment of equilibrium-phase AgBiS 2 , as supported by X-ray diffraction measurements and the pseudobinary Ag 2 S−Bi 2 S 3 phase diagram. Interestingly, the finding of a AgBiS 2 −Bi 2 S 3 −AgBiS 2 intermediate with axially segmented heterostructures reveals the real NR-to-NR conversion trajectory and the shape-induced exchange reaction anisotropy at the ends and middle of Bi 2 S 3 NRs. Additionally, the resultant AgBiS 2 NRs with a measured band gap of ∼0.86 eV exhibit potential for photoelectronic applications because of their impressive visible−near-infrared absorption and photoconductivity.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Binary–Ternary Bi₂S₃–AgBiS₂ Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Wang

et al. 2019

Inorg. Chem.

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“…A variety of nanostructures, such as core-shell nanoparticles [5,6], heterodimers [7,8], metal-tipped nanorods [9,10], and metal island-decorated nanosheets [11], have been identified as excellent candidates for a wide range of applications. In particular, these materials are useful for photoelectric devices [12][13][14], photocatalysis [15][16][17], electrocatalysis [18][19][20], and theranostic [21] treatments.…”

Section: Introductionmentioning

confidence: 99%

Pd-dispersed CuS hetero-nanoplates for selective hydrogenation of phenylacetylene

et al. 2016

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We have exploited a new and distinctive combination method that "disperses" elemental Pd into CuS nanoplates. Pd was successfully dispersed by means of the concomitant transformation of CuS into an amorphous sulfide, which formed an intimate metal-sulfide contact via cation exchange and underwent a subsequent reduction. A series of such Pd-dispersed CuS hetero-nanoplates were synthesized with tailored proportions and compositions. By efficient utilization of noble metal atoms and stable anchored active sites, the optimal catalytic performance for the semihydrogenation of phenylacetylene, a probe reaction, was achieved with high selectivity, activity, and stability. We believe that the synthetic strategy described in our study is a feasible means of developing effective metal-sulfide catalysts for organic reactions.

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“…11,13 Indeed, in the most fundamental hybrid system, the semiconductor photocatalyst is loaded with cocatalysts that promote charge separation and lower the activation potential for hydrogen evolution, thus greatly enhancing the photo-catalytic activity. 14,15 In addition to proper cocatalyst selection, its location on the photocatalytic system, the number of cocatalyst domains, 16,17 and the catalyst shape 18,19 and size 20−22 were all found to influence the performance of the hybrid system. Hence, great care should be devoted for precise control over these parameters.…”

Section: ■ Introductionmentioning

confidence: 99%

Ternary Dumbbell Nanowires for Photocatalytic Hydrogen Production

2022

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semiconductor heterojunctions with asymmetric or symmetric metal cocatalysts are promising systems for high-performance photocatalytic reactions such as solar-to-fuel conversion as the heterostructure junction enables improved charge separation. However, synthesizing such unique heterostructures with well-designed non-noble-metal cocatalysts in an affordable and scalable manner remains a challenging task. Herein, we report the sequential selective growth of ternary dumbbells composed of IrSe 2 @MoSe 2 -CdS nanowires (TDNWs), in which clusters of an IrSe 2 core coated with a MoSe 2 shell are selectively grown on both ends of CdS nanowires (NWs). This special configuration contributes to efficient charge separation. With this unique structure, the TDNWs exhibit a photocatalytic H 2 production rate of as high as 137 mmol/g h and an apparent quantum efficiency (AQE) of ∼14.5% within 1 h, which is far superior to those of non-tipped CdS NWs and asymmetrical MoSe 2 -tipped CdS NWs (ANWs). Our facile synthetic strategy extends spatial anisotropic nanorod growth and enables the construction of advanced multifunctional nano-heterostructures, paving the path for new applications.

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Selective Placement of Faceted Metal Tips on Semiconductor Nanorods

Cited by 10 publications

References 26 publications

Binary–Ternary Bi₂S₃–AgBiS₂ Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Binary–Ternary Bi₂S₃–AgBiS₂ Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Pd-dispersed CuS hetero-nanoplates for selective hydrogenation of phenylacetylene

Ternary Dumbbell Nanowires for Photocatalytic Hydrogen Production

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Selective Placement of Faceted Metal Tips on Semiconductor Nanorods

Cited by 10 publications

References 26 publications

Binary–Ternary Bi2S3–AgBiS2 Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Binary–Ternary Bi2S3–AgBiS2 Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Pd-dispersed CuS hetero-nanoplates for selective hydrogenation of phenylacetylene

Ternary Dumbbell Nanowires for Photocatalytic Hydrogen Production

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Product

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Binary–Ternary Bi₂S₃–AgBiS₂ Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction

Binary–Ternary Bi₂S₃–AgBiS₂ Rod-to-Rod Transformation via Anisotropic Partial Cation Exchange Reaction