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Title: Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials

Authors:
 [1];  [2];  [3]
  1. Department of Chemistry and James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States
  2. Institute for Multiscale Simulation, Friedrich-Alexander University Erlangen-Nürnberg, 91052 Erlangen, Germany, Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
  3. Department of Chemistry and James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States, Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois 60439, United States
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1319954
Grant/Contract Number:
5J-30161-0010A
Resource Type:
Journal Article: Published Article
Journal Name:
Chemical Reviews
Additional Journal Information:
Journal Volume: 116; Journal Issue: 18; Related Information: CHORUS Timestamp: 2017-10-31 07:39:03; Journal ID: ISSN 0009-2665
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

Citation Formats

Boles, Michael A., Engel, Michael, and Talapin, Dmitri V. Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials. United States: N. p., 2016. Web. doi:10.1021/acs.chemrev.6b00196.
Boles, Michael A., Engel, Michael, & Talapin, Dmitri V. Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials. United States. doi:10.1021/acs.chemrev.6b00196.
Boles, Michael A., Engel, Michael, and Talapin, Dmitri V. 2016. "Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials". United States. doi:10.1021/acs.chemrev.6b00196.
@article{osti_1319954,
title = {Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials},
author = {Boles, Michael A. and Engel, Michael and Talapin, Dmitri V.},
abstractNote = {},
doi = {10.1021/acs.chemrev.6b00196},
journal = {Chemical Reviews},
number = 18,
volume = 116,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acs.chemrev.6b00196

Citation Metrics:
Cited by: 33works
Citation information provided by
Web of Science

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  • We demonstrate the possibilityof obtaining a rich set of self-assembled arrays from a single component cobalt nanocrystal (NC) system by a controlled variation of size, shape and inter-particle interactions. By selecting appropriate conditions in which one of a set of weak but competing interaction forces (steric, van der Waals, depletion, or magnetostatic) dominates we can reproducibly achieve a wide range of nanocrystal arrays. This includes hexagonal and square arrays, arrays spatially segregated by size, linear chains and lyotropic crystals exhibiting increased orientation order as a function of concentration.
  • Highlights: • PbSe is obtained in a simple way by the co-precipitation method at low-temperature. • The structural, morphological and optical properties of PbSe were studied. • Adding NH{sub 4}OH to the precursor solutions influences on the morphology. • 2D- and 1D-PbSe structures assemble by oriented attachment. • PbSe can be a potential candidate for thermoelectric applications. - Abstract: This work presents a simple and low-temperature method to prepare a variety of Lead selenide (PbSe) nanostructures, using aqueous solutions of Pb(NO{sub 3}){sub 2} and NaHSe. Nanostructures with different morphology were obtained by varying the Pb:Se molar ratio, as well asmore » the mixing sequence of NH{sub 4}OH with either Pb(NO{sub 3}){sub 2} or NaHSe. Nanoparticles with different shapes (spherical and octahedral), and self-assembled structures (flakes and ribbons) were observed by Transmission Electron Microscopy. X-ray results confirmed that the PbSe rock-salt crystalline structure was obtained for all of the prepared samples. The crystal size is in the order of 7.3 to 8.9 nm for single nanocrystals. The absorption spectra of the samples show exciton absorption bands at 1395 nm and 1660 nm. This material could be used to develop more advanced structures for thermoelectric generators.« less
  • Nature combines hard and soft materials, often in hierarchical architectures, to get synergistic, optimized properties with proven, complex functionalities. Emulating such natural designs in robust engineering materials using efficient processing approaches represents a fundamental challenge to materials chemists. This presentation will review progress on understanding so-called 'evaporation-induced silica/surfactant self-assembly' (EISA) as a simple, general means to prepare porous thin-film nanostructures. Such porous materials are of interest for membranes, low-dielectric-constant (low-k) insulators, and even 'nano-valves' that open and close in response to an external stimulus. EISA can also be used to simultaneously organize hydrophilic and hydrophobic precursors into hybrid nanocomposites thatmore » are optically or chemically polymerizable, patternable, or adjustable. In constructing composite structures, a significant challenge is how to controllably organize or define multiple materials on multiple length scales. To address this challenge, we have combined sol-gel chemistry with molecular self-assembly in several evaporation-driven processing procedures collectively referred to as evaporation-induced self-assembly (EISA). EISA starts with a silica/water/surfactant system diluted with ethanol to create a homogeneous solution. We rely on ethanol and water evaporation during dip-coating (or other coating methods) to progressively concentrate surfactant and silica in the depositing film, driving micelle formation and subsequent continuous self-assembly of silica/surfactant thin film mesophases. One of the crucial aspects of this process, in terms of the sol-gel chemistry, is to work under conditions where the condensation rate of the hydrophilic silicic acid precursors (Si-OH) is minimized. The idea is to avoid gelation that would kinetically trap the system at an intermediate non-equilibrium state. We want the structure to self-assemble then solidify, with the addition of a siloxane condensation catalyst or by heating, to form the desired mesostructured product. Operating at an acidic pH (pH = 2) minimizes the condensation rate of silanols to form siloxanes Si-O-SiIn addition, hydrogen bonding and electrostatic interactions between silanols and hydrophilic surfactant head groups can further reduce the condensation rate. These combined factors maintain the depositing film in a fluid state, even beyond the point where ethanol and water are largely evaporated. This allows the deposited film to be self-healing and enables the use of virtually any evaporation-driven process (spin-coating, inkjet printing, or aerosol processing) to create ordered nanostructured films, patterns, or particles.« less
  • Here, systematic tailoring of nanocrystal architecture could provide unprecedented control over their electronic, photophysical, and charge transport properties for a variety of applications. However, at present, manipulation of the shape of perovskite nanocrystals is done mostly by trial-and-error-based experimental approaches. Here, we report systematic colloidal synthetic strategies to prepare methylammonium lead bromide quantum platelets and quantum cubes. In order to control the nucleation and growth processes of these nano crystals, we appropriately manipulate the solvent system, surface ligand chemistry, and reaction temperature causing syntheses into anisotropic shapes. We demonstrate that both the presence of chlorinated solvent and a long chainmore » aliphatic amine in the reaction mixture are crucial for the formation of ultrathin quantum platelets (similar to 1.5 nm in thickness), which is driven by mesoscale-assisted growth of spherical seed nanocrystals (similar to 1.6 nm in diameter) through attachment of monomers onto selective crystal facets. A combined surface and structural characterization, along with small-angle X-ray scattering analysis, confirm that the long hydrocarbon of the aliphatic amine is responsible for the well ordered hierarchical stacking of the quantum platelets of 3.5 nm separation. In contrast, the formation of similar to 12 nm edge-length quantum cubes is a kinetically driven process in which a high flux of monomers is achieved by supplying thermal energy. The photoluminescence quantum yield of our quantum platelets (similar to 52%) is nearly 2-fold higher than quantum cubes. Moreover, the quantum platelets display a lower nonradiative rate constant than that found with quantum cubes, which suggests less surface trap states. Together, our research has the potential both to improve the design of synthetic methods for programmable control of shape and assembly and to provide insight into optoelectronic properties of these materials for solid-state device fabrication, e.g., light-emitting diodes, solar cells, and lasing materials.« less