Toward Improved Scalability of Cation Exchange Reactions of Metal Chalcogenide Nanocrystals

Morris, Alexander L.; Lin, Cheng Huang; Benjamin, Savannah E.; Devarasetty, V. V. N. Manohar; Tilluck, Ryan W.; Lozano, Edgar I.; Hamo, Helene; Aguilar, Xyan A.; Patten, P. Gregory Van

doi:10.1021/acs.chemmater.7b01065

Cited by 8 publications

(9 citation statements)

References 24 publications

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“…Such a strategy has also been demonstrated for Ag 2 Se QDs. 86 Another important strategy to improve the air stability is by growing an inorganic epitaxial shell, forming core/shell heterostructures. The formation of type-I band alignment further reduces surface dangling bonds that serve as surface trap states, thus leading to improved light emission.…”

Section: Synthesis Of Colloidal Infrared Qdsmentioning

confidence: 99%

“…Interestingly, we find that a direct cation exchange from CdSe or ZnSe to PbSe QDs significantly improves their air stability, enabling air-stable PbSe-based QD solar cells, for example. Such a strategy has also been demonstrated for Ag 2 Se QDs . Another important strategy to improve the air stability is by growing an inorganic epitaxial shell, forming core/shell heterostructures.…”

Section: Synthesis Of Colloidal Infrared Qdsmentioning

confidence: 99%

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Infrared Quantum Dots: Progress, Challenges, and Opportunities

et al. 2019

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Infrared technologies provide tremendous value to our modern-day society. The need for easy-to-fabricate, solution-processable, tunable infrared active optoelectronic materials has driven the development of infrared colloidal quantum dots, whose band gaps can readily be tuned by dimensional constraints due to the quantum confinement effect. In this Perspective, we summarize recent progress in the development of infrared quantum dots both as infrared light emitters (e.g., in light-emitting diodes, biological imaging, etc.) as well as infrared absorbers (e.g., in photovoltaics, solar fuels, photon up-conversion, etc.), focusing on how fundamental breakthroughs in synthesis, surface chemistry, and characterization techniques are facilitating the implementation of these nanostructures into exploratory device architectures as well as in emerging applications. We discuss the ongoing challenges and opportunities associated with infrared colloidal quantum dots.

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Section: Synthesis Of Colloidal Infrared Qdsmentioning

confidence: 99%

Section: Synthesis Of Colloidal Infrared Qdsmentioning

confidence: 99%

Infrared Quantum Dots: Progress, Challenges, and Opportunities

et al. 2019

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“…For example, Rogach and colleagues reported a CER in a microfluidic flow reactor to synthesize Cd x Hg 1Àx Te QDs; 79 van Patten and colleagues reported CER-enabled multigram-scale conversions of NCs by applying an air-stable and photostable Ag complex. 95 Inorganic Perovskite NCs Tailoring the composition of inorganic perovskite NCs via AERs and CERs has recently been developed as an efficient strategy for tunable PL and enhanced stability (Figure 3B). 11,90,96 The composition of inorganic perovskite NCs is normally ABX 3 , where the A site is a 1+ cation (such as Cs + ), the B site is a 2+ cation (such as Pb 2+ ), and the C site is a 1À anion (such as Cl À ).…”

Section: Alloyed and Doped Qdsmentioning

confidence: 99%

Cation/Anion Exchange Reactions toward the Syntheses of Upgraded Nanostructures: Principles and Applications

et al. 2020

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The last 5 years have witnessed rapid progress in the field of hybrid nanostructures toward enhanced optical and electronic properties. On this topic, we focus on the relevant progress that has been achieved on the basis of cation/anion exchange reactions (CERs/AERs). Different from those direct synthesis strategies, CERs/AERs can offer more freedom in tuning the chemical composition, crystal phases, doping, interfaces, and morphologies, which are key parameters to determine the optical and electronic properties of the target products. We present several examples, e.g., doped quantum dots (QDs), engineered core-shell QDs, metal-semiconductor hybrid nanostructures, hollow structures, and inorganic perovskite nanocrystals. These upgraded structures afforded by CERs/ AERs generally exhibit improved properties, such as increased quantum yields, prolonged lifetimes, and well-engineered band gaps for charge transportation and recombination, thus providing more opportunities for further advanced applications.

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“…We therefore approached the formation of Ni 2 P–CdS retrosynthetically, using cation-exchange pathways. It is known that CdS can be accessed by exchanging the Ag + cations of Ag 2 S with Cd 2+ . It is also known that Ag 2 S can be accessed by exchanging the Pb 2+ cations of PbS with Ag + .…”

Section: Resultsmentioning

confidence: 99%

“…It is known that CdS can be accessed by exchanging the Ag + cations of Ag 2 S with Cd 2+ . 73 It is also known that Ag 2 S can be accessed by exchanging the Pb 2+ cations of PbS with Ag + . 73 Because we already succeeded in making Ni 2 P−PbS in high yield through traditional seeded-growth methods (Figure 2), we began with Ni 2 P−PbS and carried out sequential, complete cation-exchange reactions with Ag + and then Cd 2+ .…”

Section: Inorganicmentioning

confidence: 99%

Incorporation of Metal Phosphide Domains into Colloidal Hybrid Nanoparticles

et al. 2021

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Colloidal hybrid nanoparticles have generated considerable attention in the inorganic nanomaterials community. The combination of different materials within a single nanoparticle can lead to synergistic properties that can enable new properties, new applications, and the discovery of new phenomena. As such, methodologies for the synthesis of hybrid nanoparticles that integrate metal−metal, metal chalcogenide, metal oxide, and oxide−chalcogenide domains have been extensively reported in the literature. However, colloidal hybrid nanoparticles containing metal phosphide domains are rare, despite being attractive systems for their potentially unique catalytic, photocatalytic, and optoelectronic properties. In this Forum Article, we report a study of the synthesis of colloidal hybrid nanoparticles that couple the metal phosphides Ni 2 P and Co x P y with Au, Ag, PbS, and CdS using heterogeneous seeded-growth reactions. We also investigate the transformation of Au−Ni heterodimers to Au−Ni 2 P, where phosphidation of preformed metal−metal hybrid nanoparticles offers an alternative route to metal phosphide systems. We also study sequential cation-exchange reactions to target specific metal phosphide hybrids, i.e., the transformation of Ni 2 P−PbS into Ni 2 P−Ag 2 S and then Ni 2 P−CdS. Throughout all of these pathways, the accompanying discussion emphasizes the synthetic rationale, as well as the challenges in synthesis and characterization that are unique to these systems. In particular, the observation of oxide shells that surround the phosphide domains has implications for the potential photocatalytic applications of these hybrid nanoparticles.

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Toward Improved Scalability of Cation Exchange Reactions of Metal Chalcogenide Nanocrystals

Cited by 8 publications

References 24 publications

Infrared Quantum Dots: Progress, Challenges, and Opportunities

Infrared Quantum Dots: Progress, Challenges, and Opportunities

Cation/Anion Exchange Reactions toward the Syntheses of Upgraded Nanostructures: Principles and Applications

Incorporation of Metal Phosphide Domains into Colloidal Hybrid Nanoparticles

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