Lead Selenide Nanostructured Aerogels and Xerogels

Kalebaila, Kennedy K.; Brock, Stephanie L.

doi:10.1002/zaac.201200354

Cited by 13 publications

(8 citation statements)

References 47 publications

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“…ions or molecules). The former has been adapted across noble metal (16,(18)(19)(20)(21) , metal chalcogenide (22)(23)(24)(25)(26) , and metal oxide (27)(28)(29)(30)(31) systems, but this method is prone to fuse NCs during assembly and consequently limits the realization of size and shape-dependent NC optical properties (i.e., PL and LSPR) within the gels. While gelation via chemical bridging is a viable strategy to mitigate NC fusing, translating this approach across NC materials requires customizing surface functional groups for specific NC compositions, so far limited to metal chalcogenide NCs (32,33) and Au NPs (17) .…”

Section: Introductionmentioning

confidence: 99%

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Cabezas

Ong

Jadrich

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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Gelation of colloidal nanocrystals emerged as a strategy to preserve inherent nanoscale properties in multiscale architectures. However, available gelation methods to directly form self-supported nanocrystal networks struggle to reliably control nanoscale optical phenomena such as photoluminescence and localized surface plasmon resonance (LSPR) across nanocrystal systems due to processing variabilities. Here, we report on an alternative gelation method based on physical internanocrystal interactions: short-range depletion attractions balanced by long-range electrostatic repulsions. The latter are established by removing the native organic ligands that passivate tin-doped indium oxide (ITO) nanocrystals while the former are introduced by mixing with small PEG chains. As we incorporate increasing concentrations of PEG, we observe a reentrant phase behavior featuring two favorable gelation windows; the first arises from bridging effects while the second is attributed to depletion attractions according to phase behavior predicted by our unified theoretical model. Our assembled nanocrystals remain discrete within the gel network, based on X-ray scattering and high-resolution transmission electron microscopy. The infrared optical response of the gels is reflective of both the nanocrystal building blocks and the network architecture, being characteristic of ITO nanocrystals' LSPR with coupling interactions between neighboring nanocrystals.

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Section: Introductionmentioning

confidence: 99%

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Cabezas

Ong

Jadrich

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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“…This enables to extend the complexity and functionality of the macroscopic aerogels beyond what is possible using simple isotropic NCs as NBBs. This is in contrast to the early stages of the research on nanoparticle based gels, where the main efforts were paid to extending the material range, using quasispherical NCs as NBBs such as GeS x , CdS, CdSe, CdTe, PbS, PbSe, and InP …”

Section: Semiconductor Hierarchical Aerogelsmentioning

confidence: 94%

Emerging Hierarchical Aerogels: Self‐Assembly of Metal and Semiconductor Nanocrystals

et al. 2018

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Aerogels assembled from colloidal metal or semiconductor nanocrystals (NCs) feature large surface area, ultralow density, and high porosity, thus rendering them attractive in various applications, such as catalysis, sensors, energy storage, and electronic devices. Morphological and structural modification of the aerogel backbones while maintaining the aerogel properties enables a second stage of the aerogel research, which is defined as hierarchical aerogels. Different from the conventional aerogels with nanowire-like backbones, those hierarchical aerogels are generally comprised of at least two levels of architectures, i.e., an interconnected porous structure on the macroscale and a specially designed configuration at local backbones at the nanoscale. This combination "locks in" the inherent properties of the NCs, so that the beneficial genes obtained by nanoengineering are retained in the resulting monolithic hierarchical aerogels. Herein, groundbreaking advances in the design, synthesis, and physicochemical properties of the hierarchical aerogels are reviewed and organized in three sections: i) pure metallic hierarchical aerogels, ii) semiconductor hierarchical aerogels, and iii) metal/semiconductor hybrid hierarchical aerogels. This report aims to define and demonstrate the concept, potential, and challenges of the hierarchical aerogels, thereby providing a perspective on the further development of these materials.

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“…[88] Nowadays, a wide range of inorganic materials can be processed into nanoparticle-based aerogels including metal chalcogenides (CdS, CdSe, CdTe, PbS, ZnS, etc. ), [84,[88][89][90][91][92][93][94][95][96] metals (Pd, Pt, Au, Ag, etc. ), [97][98][99][100][101] their oxides (TiO 2 , [102][103][104][105][106] Y 2 O 3 , [81] BaTiO 3 , [82] InTaO 4 , [107] SrTiO 3 , [87] Y 3 Al 5 O 12 , [108] etc.…”

Section: Disordered Porous Structuresmentioning

confidence: 99%

Colloidal Nanocrystals: A Toolbox for Materials Chemistry

Matter

Niederberger

Putz

2021

Chimia

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Colloidal nanocrystals are the ideal building blocks for the fabrication of functional materials. Using various assembly, patterning or processing techniques, the nanocrystals can be arranged with unprecedented flexibility in 1-, 2- or 3-dimensional architectures over several orders of length scales, providing access to ordered or disordered, porous or non-porous, and simple as well as hierarchical structures. Careful selection of colloidal nanocrystals allows the properties of the final materials to be predefined. Moreover, by combining different nanocrystals, these properties can be fine-tuned for a specific application, opening up fascinating opportunities to create new materials for energy storage and conversion, catalysis, photocatalysis, biomedicine or optics. Indeed, functional materials made of preformed nanoparticles have been realized for metals, polymers, semiconductors, and ceramics, as well as for composites and organic-inorganic hybrids. In this review article, we introduce some concepts for the fabrication of colloidal nanocrystals and their assembly into dense and porous 3-dimensional structures. Porosity is a particularly important material property that strongly influences its application potential. Therefore, we pay special attention to this aspect and compare porous materials synthesized from nanoparticles with those from molecular routes. An additional focus is set on the degree of structural order that can be achieved on different length scales.

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Lead Selenide Nanostructured Aerogels and Xerogels

Cited by 13 publications

References 47 publications

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Emerging Hierarchical Aerogels: Self‐Assembly of Metal and Semiconductor Nanocrystals

Colloidal Nanocrystals: A Toolbox for Materials Chemistry

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