Synthesis of PbSeTe Single Ternary Alloy and Core/Shell Heterostructured Nanocubes

Quan, Zewei; Luo, Zhiping; Loc, Welley Siu; Zhang, Jun; Wang, Yuxuan; Yang, Kai; Porter, Nathan; Lin, Jun; Wang, Howard; Fang, Jiye

doi:10.1021/ja207763p

Cited by 39 publications

(27 citation statements)

References 25 publications

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“…The second test material is built on PbTexSex-1@PbS core-shell NP building blocks, that were synthesized by modifying the procedure presented in the previous section. 101,104 The Supporting Information is also included as an annex after the article because of the valuable information that contains. As the article is published as a Communication, detailed explanations over NP synthesis are here available.…”

Section: Np Purification and Surface Engineeringmentioning

confidence: 99%

Bottom-up engineering of thermoelectric nanomaterials and devices from solution-processed nanoparticle building blocks

et al. 2017

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The conversion of thermal energy to electricity and vice versa by means of solid state thermoelectric devices is extremely appealing. However, its cost-effectiveness is seriously hampered by the relatively high production cost and low efficiency of current thermoelectric materials and devices. To overcome present challenges and enable a successful deployment of thermoelectric systems in their wide application range, materials with significantly improved performance need to be developed. Nanostructuration can help in several ways to reach the very particular group of properties required to achieve high thermoelectric performances. Nanodomains inserted within a crystalline matrix can provide large charge carrier concentrations without strongly influencing their mobility, thus allowing to reach very high electrical conductivities. Nanostructured materials contain numerous grain boundaries that efficiently scatter mid- and long-wavelength phonons thus reducing the thermal conductivity. Furthermore, nanocrystalline domains can enhance the Seebeck coefficient by modifying the density of states and/or providing type- and energy-dependent charge carrier scattering. All these advantages can only be reached when engineering a complex type of material, nanocomposites, with exquisite control over structural and chemical parameters at multiple length scales. Since current conventional nanomaterial production technologies lack such level of control, alternative strategies need to be developed and adjusted to the specifics of the field. A particularly suitable approach to produce nanocomposites with unique level of control over their structural and compositional parameters is their bottom-up engineering from solution-processed nanoparticles. In this work, we review the state-of-the-art of this technology applied to the thermoelectric field, including the synthesis of nanoparticles of suitable materials with precisely engineered composition and surface chemistry, their combination and consolidation into nanostructured materials, the strategies to electronically dope such materials and the attempts to fabricate thermoelectric devices using nanoparticle-based nanopowders and inks.

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Section: Np Purification and Surface Engineeringmentioning

confidence: 99%

Bottom-up engineering of thermoelectric nanomaterials and devices from solution-processed nanoparticle building blocks

et al. 2017

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“…Reactions targeting the chemical transformation of nanostructures can be classified into three main categories: alloying, ion exchange and galvanic replacement processes. Nanoparticles containing binary or multiple elements with various structures have been produced, including solid, hollow, yolk and core–shell nanoparticles, as well as nanowires and nanotubes. In the case of alloyed nanoparticles, chalcogens (O, S, Se, and Te) are a frequent choice, because the enthalpy of formation of these nanomaterials, is much lower than that of the pure components which acts as the driving force in the alloying process.…”

Section: Bottom‐up Processes For the Production Of Enmsmentioning

confidence: 99%

Reaction Engineering Strategies for the Production of Inorganic Nanomaterials

Sebastián

Arruebo

Santamarı́a

2013

Small

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The rapid expansion of nanotechnology requires scaled-up production rates to cope with increased nanomaterials demand. However, in many cases, the final uses of nanomaterials impose strict requisites on their physical and chemical characteristics including size, shape, chemical composition and type of functional groups on their surface. Frequently, additional features such as a limited degree of agglomeration are also demanded. These requisites represent a serious challenge to present-day synthesis methods when nanomaterials must be produced in large amounts. Some of the possible solutions from the reaction engineering perspective are discussed in this work for both gas and liquid phase production processes. Special attention will be devoted to enabling technologies, which allow the production of engineered nanoparticles with limited aggregation and with a good control on their nano-scale characteristics.

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“…While PbS provided us with a simple system to demonstrate the potential of the developed procedure to introduce controlled amounts of dopants, in order to prove the potential of this strategy for achieving a high thermoelectric figure of merit for the bottom-up assembled nanocrystalline materials we prepared new nanomaterial based on PbTe x Se 1-x @PbS core-shell NPs, and applied the same doping strategy. PbTe x Se 1-x @PbS core-shell NPs were produced by consecutive reactions of lead oleate with chalcogens following a combination of the methods developed by Quan et al 10 to produce PbTe x Se 1-x cores and ourselves to produce PbTe@PbS coreshell NPs (SI). 11 Figure 3 displays representative TEM micrographs of the cube-shaped PbTe x Se 1-x cores and the final PbTe x Se 1-x @PbS core-shell NPs produced.…”

mentioning

confidence: 99%

Electron Doping in Bottom-Up Engineered Thermoelectric Nanomaterials through HCl-Mediated Ligand Displacement

et al. 2015

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A simple and effective method to introduce precise amounts of doping in nanomaterials produced from the bottom-up assembly of colloidal nanoparticles (NPs) is described. The procedure takes advantage of a ligand displacement step to incorporate controlled concentrations of halide ions while removing carboxylic acids from the NP surface. Upon consolidation of the NPs into dense pellets, halide ions diffuse within the crystal structure, doping the anion sublattice and achieving n-type electrical doping. Through the characterization of the thermoelectric properties of nanocrystalline PbS, we demonstrate this strategy to be effective to control charge transport properties on thermoelectric nanomaterials assembled from NP building blocks. This approach is subsequently extended to PbTe(x)Se(1-x)@PbS core-shell NPs, where a significant enhancement of the thermoelectric figure of merit is achieved.

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Synthesis of PbSeTe Single Ternary Alloy and Core/Shell Heterostructured Nanocubes

Cited by 39 publications

References 25 publications

Bottom-up engineering of thermoelectric nanomaterials and devices from solution-processed nanoparticle building blocks

Bottom-up engineering of thermoelectric nanomaterials and devices from solution-processed nanoparticle building blocks

Reaction Engineering Strategies for the Production of Inorganic Nanomaterials

Electron Doping in Bottom-Up Engineered Thermoelectric Nanomaterials through HCl-Mediated Ligand Displacement

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