Generalized seeded growth of Ag-based metal chalcogenide nanorods via controlled chalcogenization of the seeds

Chen, Shutang; Thota, Sravan; Reggiano, Gabriella; Zhao, Jing

doi:10.1039/c5tc02904j

Cited by 18 publications

(18 citation statements)

References 60 publications

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“…In the recent two decades, control over the synthesis procedures and the understanding of charge carrier dynamics (thus, the catalytic behavior as well) in such systems attracted a paramount research interest. As a result, CdTe quantum dots (QDs), CdSe QDs, CdSe nanorods (NRs), CdS NRs and CdSe/CdS dot-in-rod NCs can be efficiently decorated with Ag, [18] Au, [19][20][21][22][23] Pt, [24][25][26] AuPd, [27] Ni, [28,29] Co [30][31][32][33] , Ni(OH) 2 , [34][35][36] or Co(OH) 2 [37] domains; furthermore, we also published a method for the site-selective growth of noble metals on CdSe/CdS core/crown NPLs. [38] The electronic structure of these hybrid NCs (i.e., band alignment, Fermi level) allows the enhancement of the light-induced charge carrier separation endowing them with high potential in photocatalytic applications such as water splitting [16,29,33,35,[37][38][39][40] or H 2 O 2 production.…”

Section: Introductionmentioning

confidence: 99%

One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

Zámbó

Schlosser

Graf

et al. 2021

Advanced Optical Materials

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Hybrid semiconductor‐based nanocrystals (NCs) are generally synthesized in organic media prior to their assembly into catalytically promising nanostructures via multistep methods. Here, a tunable, easy‐to‐adapt and versatile approach for the preparation of hybrid nanoparticle networks from aqueous nanocrystal solutions is demonstrated. The networks consist of interconnected semiconductor NC backbones (made of CdSe/CdS dot‐in‐rods or core/crown nanoplatelets) decorated with noble metal (Au and Pt) or with metal‐based domains (Co2+ and Ni2+) demonstrating a powerful synthetic control over a variety of hybrid nanostructures. The deposition of the domains and the formation of the network take place simultaneously (one‐step method) at room temperature in dark conditions without any external trigger. Beside the in‐depth structural characterization of the gel‐like hybrid networks, the wavelength‐dependent optical features are studied to reveal an efficient charge carrier separation in the systems and a controllable extent of fluorescence quenching through the domain sizes. Photoluminescence quantum yields and decay dynamics highlight the importance of fine‐tuning the conduction band/Fermi level offset between the semiconductors and the various deposited metals playing central role in the electron–hole separation processes. This procedure provides a novel platform toward the preparation of photo(electro)catalytically promising hybrid nanostructures (acetogels and xerogels) without the need of presynthetic hybrid particle design.

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Section: Introductionmentioning

confidence: 99%

One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

Zámbó

Schlosser

Graf

et al. 2021

Advanced Optical Materials

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“…A brief introduction to the preparation method and the resultant morphology and the optical properties of the Ag 2 S‐CdS compound is given. Most previous studies were performed in an organic medium with complex chemistry that controls the growth of the final products . The morphology of the prepared Ag 2 S/CdS changed dramatically between reports and depended on the type of surfactant, the solvent type, the method of preparation and nucleation of silver sulfide .…”

Section: Resultsmentioning

confidence: 99%

“…Most previous studies were performed in an organic medium with complex chemistry that controls the growth of the final products . The morphology of the prepared Ag 2 S/CdS changed dramatically between reports and depended on the type of surfactant, the solvent type, the method of preparation and nucleation of silver sulfide . For example, match stick‐like nanoparticles of Ag 2 S−CdS, in which Ag 2 S catalyzes the formation of CdS nanorods on the side of silver sulfide nanoparticles can be prepared due to control of crystal growth and the type of ligand linkage to CdS, as well as the concentration of silver ions .…”

Section: Resultsmentioning

confidence: 99%

“…[17,[19][20][21][22][23][24][25][26][27] The morphology of the prepared Ag 2 S/CdS changed dramatically between reports and depended on the type of surfactant, the solvent type, the method of preparation and nucleation of silver sulfide. [17,[19][20][21][22][23][24][25][26][27] For example, match stick-like nanoparticles of Ag 2 S −CdS, in which Ag 2 S catalyzes the formation of CdS nanorods on the side of silver sulfide nanoparticles can be prepared due to control of crystal growth and the type of ligand linkage to CdS, as well as the concentration of silver ions. [21] Similarity of the crystal phases of these reports with the present work shows that control of the synthesis parameters plays an essential role in the formation of the final morphology.…”

Section: Structural Verification Of Ag 2 S@cds Qdsmentioning

confidence: 99%

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Reviving near infra‐red emission of Ag₂S nanoparticles using interfacial defects in the Ag₂S@CdS core–shell structure

2017

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Ag 2 S@CdS core-shell particles were synthesized with different Cd source content as a measure of shell thickness using a pulsed microwave irradiation method. The particles were verified structurally using X-ray diffraction, energy dispersive X-ray analysis and transmission electron microscopy. Optical spectroscopy revealed that core-shells show an absorption peak at 750 nm and an emission peak located around 800 nm after 6 min of microwave irradiation. With continued microwave treatment, the NIR luminescence first vanished but it was revived after 12 min of irradiation, which was 100 nm red shifted. This new type of NIR emission in Ag 2 S with sizes greater than 5 nm is due to the proximity of a highly deficient CdS shell with strong red emission that was stable for more than 6 months in water. A mechanism has been suggested for this type of emission.

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“…[29,66,67] Whereas other reports demonstrated the usage of metal nanoparticles as seeds enabling 1D growth of semiconducting nanorods. [70,71] This group also developed two step growth method for synthesizing metal-semiconductor nanorods with controllable metallic tip size. [68] Initially, under dark condition, facet-dependent growth takes place leading to small island generation at tip of CdS NRs which act as seeds for next step, shown in Figure 3c.…”

Section: Synthesis Of Quantum Dots and Core/shell Metal/ Semiconductomentioning

confidence: 99%

Modified Absorption and Emission Properties Leading to Intriguing Applications in Plasmonic–Excitonic Nanostructures

Kumar

Nisika

Kumar

2020

Advanced Optical Materials

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years, great advances have been made to grow various shaped semiconductor nanocrystals (SNCs) like quantum dots, [7] nanowires, [8] nanorods (NR), [9] and other advanced shaped nanostructures, [10-12] with great precision. However, these semiconductor nanostructures have small extinction cross-sections (even smaller than geometric cross-section), leading to limited absorbance and emission quantum yields. This hinders the progress of semiconductor nanostructures in several areas ranging from clean energy production to various sensing applications. Among many promising solutions, integrating plasmonic nanoparticles (PNPs) with semiconductor nanostructures emerges as the most prominent way to alleviate aforementioned issue. The PNPs have greater extinction cross-section than SNCs (even greater than geometric cross-section), owing to light absorption and scattering by collective and coherent electron oscillations. [13,14] Moreover, these coherent oscillations can couple with electromagnetic wavelengths far greater than particle size, enabling them to guide light to subwavelength scales, thus overcoming diffraction limit. [15] Besides this, proper control over size and shape of plasmonic nanostructures enables engineering of their intrinsic properties to meet the criteria of required application. [16] For instance, by changing the aspect ratio (length to diameter ratio) of nanorods, one can cover wide spectral regions ranging from visible to near-infrared (NIR) regimes. [17] Thus, the integration of plasmonic and semiconductor nanostructures to obtain greater extinction cross-sections and modified properties in these hybrid nanostructures has received great attention from the research community over the past years. The properties of these hybrid nanostructures can be very different from the two nanoconstituents (metal and semiconductor nanostructures), owing to plasmon-exciton interactions. [18-20] Various configurations of metal/semiconductor nanostructures have been synthesized like metallic core/semiconductor shell, [21] semiconductor NR/metal nanoparticles (MNPs), [22] Janus metal/ semiconductor nanostructures, [23] and many others have been reported, [24-26] with varying absorption and emissive properties, targeting high performance applications. The energy transfer between metal-semiconductor nanostructures resulting from integration of PNPs and SNCs Hybrid nanostructures composed of metal and semiconducting nanocrystals have drawn tremendous attention owing to their extraordinary absorption and emission properties. The energy transfer in metal-semiconductor hybrids as a result of synergetic plasmon-exciton interactions leads to numerous applications in the field of solar energy harvesting, photocatalytic reactions, imaging, photonics, sensing, and many more. Various breakthroughs in advanced characterization techniques over the past decade have disclosed several factors affecting the energy transfer processes leading to modified absorption and emission properties in metal-semiconductor hybrids. Herein, various ...

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Generalized seeded growth of Ag-based metal chalcogenide nanorods via controlled chalcogenization of the seeds

Abstract: A generalized synthesis is developed for a series of metal–chalcogenide nanorods using Ag nanocrystals as seeds. The Ag based CdS nanorods without sulfurization of the Ag seeds showed improved photocatalytic properties.

Cited by 18 publications

References 60 publications

One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

Reviving near infra‐red emission of Ag₂S nanoparticles using interfacial defects in the Ag₂S@CdS core–shell structure

Modified Absorption and Emission Properties Leading to Intriguing Applications in Plasmonic–Excitonic Nanostructures

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Generalized seeded growth of Ag-based metal chalcogenide nanorods via controlled chalcogenization of the seeds

Abstract: A generalized synthesis is developed for a series of metal–chalcogenide nanorods using Ag nanocrystals as seeds. The Ag based CdS nanorods without sulfurization of the Ag seeds showed improved photocatalytic properties.

Cited by 18 publications

References 60 publications

One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks

Reviving near infra‐red emission of Ag2S nanoparticles using interfacial defects in the Ag2S@CdS core–shell structure

Modified Absorption and Emission Properties Leading to Intriguing Applications in Plasmonic–Excitonic Nanostructures

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Reviving near infra‐red emission of Ag₂S nanoparticles using interfacial defects in the Ag₂S@CdS core–shell structure