1
|
Matter F, Niederberger M. Optimization of Mass and Light Transport in Nanoparticle-Based Titania Aerogels. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:7995-8008. [PMID: 37840780 PMCID: PMC10568969 DOI: 10.1021/acs.chemmater.3c01218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 08/31/2023] [Indexed: 10/17/2023]
Abstract
Aerogels composed of preformed titania nanocrystals exhibit a large surface area, open porosity, and high crystallinity, making these materials appealing for applications in gas-phase photocatalysis. Recent studies on nanoparticle-based titania aerogels have mainly focused on optimizing their composition to improve photocatalytic performance. Little attention has been paid to modification at the microstructural level to control fundamental properties such as gas permeability and light transmittance, although these features are of fundamental importance, especially for photocatalysts of macroscopic size. In this study, we systematically control the porosity and transparency of titania gels and aerogels by adjusting the particle loading and nonsolvent fraction during the gelation step. Mass transport and light transport were assessed by gas permeability and light attenuation measurements, and the results were related to the microstructure determined by gas sorption analysis and scanning electron microscopy. Mass transport through the aerogel network was found to proceed primarily via Knudsen diffusion leading to relatively low permeabilities in the range of 10-5-10-6 m2/s, despite very high porosities of 96-99%. While permeability was found to depend mainly on particle loading, the optical properties are predominantly affected by the amount of nonsolvent during gelation, allowing independent tuning of mass and light transport.
Collapse
Affiliation(s)
- Fabian Matter
- Laboratory for Multifunctional
Materials, Department of Materials, ETH
Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional
Materials, Department of Materials, ETH
Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| |
Collapse
|
2
|
Anucha CB, Altin I, Bacaksiz E, Stathopoulos VN. Titanium Dioxide (TiO₂)-Based Photocatalyst Materials Activity Enhancement for Contaminants of Emerging Concern (CECs) Degradation: In the Light of Modification Strategies. CHEMICAL ENGINEERING JOURNAL ADVANCES 2022. [DOI: 10.1016/j.ceja.2022.100262] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
|
3
|
Rusch P, Pluta D, Lübkemann F, Dorfs D, Zámbó D, Bigall NC. Temperature and Composition Dependent Optical Properties of CdSe/CdS Dot/Rod-Based Aerogel Networks. Chemphyschem 2022; 23:e202100755. [PMID: 34735043 PMCID: PMC9299188 DOI: 10.1002/cphc.202100755] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Indexed: 12/04/2022]
Abstract
Employing nanocrystals (NCs) as building blocks of porous aerogel network structures allows the conversion of NC materials into macroscopic solid structures while conserving their unique nanoscopic properties. Understanding the interplay of the network formation and its influence on these properties like size-dependent emission is a key to apply techniques for the fabrication of novel nanocrystal aerogels. In this work, CdSe/CdS dot/rod NCs possessing two different CdSe core sizes were synthesized and converted into porous aerogel network structures. Temperature-dependent steady-state and time-resolved photoluminescence measurements were performed to expand the understanding of the optical and electronic properties of these network structures generated from these two different building blocks and correlate their optical with the structural properties. These investigations reveal the influence of network formation and aerogel production on the network-forming nanocrystals. Based on the two investigated NC building blocks and their aerogel networks, mixed network structures with various ratios of the two building blocks were produced and likewise optically characterized. Since the different building blocks show diverse optical response, this technique presents a straightforward way to color-tune the resulting networks simply by choosing the building block ratio in connection with their quantum yield.
Collapse
Affiliation(s)
- Pascal Rusch
- Institute of Physical Chemistry and ElectrochemistryLeibniz Universität HannoverCallinstraße 3A30167HannoverGermany
- Laboratory of Nano and Quantum EngineeringLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
| | - Denis Pluta
- Institute of Physical Chemistry and ElectrochemistryLeibniz Universität HannoverCallinstraße 3A30167HannoverGermany
- Laboratory of Nano and Quantum EngineeringLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
- Hannover School for NanotechnologyLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
| | - Franziska Lübkemann
- Institute of Physical Chemistry and ElectrochemistryLeibniz Universität HannoverCallinstraße 3A30167HannoverGermany
- Laboratory of Nano and Quantum EngineeringLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
| | - Dirk Dorfs
- Institute of Physical Chemistry and ElectrochemistryLeibniz Universität HannoverCallinstraße 3A30167HannoverGermany
- Laboratory of Nano and Quantum EngineeringLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
- Cluster of Excellence, PhoenixD(Photonics, Optics and Engineering – Innovation Across Disciplines)Leibniz Universität Hannover30167HannoverGermany
| | - Dániel Zámbó
- Institute of Physical Chemistry and ElectrochemistryLeibniz Universität HannoverCallinstraße 3A30167HannoverGermany
- Laboratory of Nano and Quantum EngineeringLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
| | - Nadja C. Bigall
- Institute of Physical Chemistry and ElectrochemistryLeibniz Universität HannoverCallinstraße 3A30167HannoverGermany
- Laboratory of Nano and Quantum EngineeringLeibniz Universität HannoverSchneiderberg 3930167HannoverGermany
- Cluster of Excellence, PhoenixD(Photonics, Optics and Engineering – Innovation Across Disciplines)Leibniz Universität Hannover30167HannoverGermany
| |
Collapse
|
4
|
Kwon J, Choi K, Schreck M, Liu T, Tervoort E, Niederberger M. Gas-Phase Nitrogen Doping of Monolithic TiO 2 Nanoparticle-Based Aerogels for Efficient Visible Light-Driven Photocatalytic H 2 Production. ACS APPLIED MATERIALS & INTERFACES 2021; 13:53691-53701. [PMID: 34730952 DOI: 10.1021/acsami.1c12579] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The development of visible light-active photocatalysts is essential for increasing the conversion efficiency of solar energy into hydrogen (H2). Here, we present a facile method for nitrogen doping of monolithic titanium dioxide (TiO2) nanoparticle-based aerogels to activate them for visible light. Plasma-enhanced chemical vapor deposition at low temperature enables efficient incorporation of nitrogen into preformed TiO2 aerogels without compromising their advantageous intrinsic characteristics such as large surface area, extensive porosity, and nanoscale properties of the semiconducting building blocks. By balancing the dopant concentration and the defects, the nitridation improves optical absorption and charge separation efficiency. The nitrogen-doped TiO2 nanoparticle-based aerogels loaded with palladium (Pd) nanoparticles show a significant enhancement in visible light-driven photocatalytic H2 production (3.1 mmol h-1 g-1) with excellent stability over 5 days. With this method, we introduce a powerful tool to tune the properties of nanoparticle-based aerogels after synthesis for a specific application, as exemplified by visible light-driven H2 production.
Collapse
Affiliation(s)
- Junggou Kwon
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zürich 8093, Switzerland
| | - Kyoungjun Choi
- Nanoscience for Energy Technology and Sustainability, Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, Zürich 8092, Switzerland
| | - Murielle Schreck
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zürich 8093, Switzerland
| | - Tian Liu
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zürich 8093, Switzerland
| | - Elena Tervoort
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zürich 8093, Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zürich 8093, Switzerland
| |
Collapse
|
5
|
Marques AC, Vale M, Vicente D, Schreck M, Tervoort E, Niederberger M. Porous Silica Microspheres with Immobilized Titania Nanoparticles for In-Flow Solar-Driven Purification of Wastewater. GLOBAL CHALLENGES (HOBOKEN, NJ) 2021; 5:2000116. [PMID: 33976905 PMCID: PMC8101353 DOI: 10.1002/gch2.202000116] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 12/07/2020] [Indexed: 05/10/2023]
Abstract
In this paper, inorganic silica microspheres with interconnected macroporosity are tested as a platform for designing robust and efficient photocatalytic systems for a continuous flow reactor, enabling a low cost and straightforward purification of wastewater through solar-driven photocatalysis. The photocatalytically active microspheres are prepared by wet impregnation of porous silica scaffolds with Trizma-functionalized anatase titania (TiO2) nanoparticles (NPs). NPs loading of 22 wt% is obtained in the form of a thin and well-attached layer, covering the external surface of the microspheres as well as the internal surface of the pores. The TiO2 loading leads to an increase of the specific surface area by 26%, without impacting the typically interconnected macroporosity (≈60%) of the microspheres, which is essential for an efficient flow of the pollutant solution during the photocatalytic tests. These are carried out in a liquid medium for the decomposition of methyl orange and paracetamol. In addition to photocatalytic activity under continuous flow, the microspheres offer the advantage that they can be easily removed from the reaction medium, which is an appealing aspect for industrial applications. In this work, the typical issues of TiO2 NPs photocatalysts are circumvented, without the need for elaborate chemistries, and for low availability and expensive raw materials.
Collapse
Affiliation(s)
- Ana C. Marques
- CERENADEQInstituto Superior TécnicoUniversidade de LisboaAvenida Rovisco PaisLisboa1049‐001Portugal
| | - Mário Vale
- CERENADEQInstituto Superior TécnicoUniversidade de LisboaAvenida Rovisco PaisLisboa1049‐001Portugal
| | - Daniel Vicente
- CERENADEQInstituto Superior TécnicoUniversidade de LisboaAvenida Rovisco PaisLisboa1049‐001Portugal
| | - Murielle Schreck
- Laboratory for Multifunctional MaterialsDepartment of MaterialsETH Zürich, Vladimir‐Prelog‐Weg 5Zürich8093Switzerland
| | - Elena Tervoort
- Laboratory for Multifunctional MaterialsDepartment of MaterialsETH Zürich, Vladimir‐Prelog‐Weg 5Zürich8093Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional MaterialsDepartment of MaterialsETH Zürich, Vladimir‐Prelog‐Weg 5Zürich8093Switzerland
| |
Collapse
|
6
|
Tarutani N, Hashimoto M, Ishigaki T. Organic-Inorganic Hybrid Nanocrystal-based Cryogels with Size-Controlled Mesopores and Macropores. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2884-2890. [PMID: 33576641 DOI: 10.1021/acs.langmuir.0c03112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nanocrystal-based processing has attracted significant interest for the fabrication of highly functional materials with controlled crystallinity and fine porous structures. In this study, we focused on the template-free synthesis of nanocrystal-based materials with size-tailored pores using layered nickel hydroxide intercalated with acrylate anions. Polymerization of the acrylates encouraged interconnection of the nanocrystals and the formation of homogeneous gel networks. Cryogels after freeze-drying had pores with an average diameter from 4.8 nm (mesoscale) to 68.9 nm (macroscale). It was found that the surface characteristics of starting nanocrystals determined the phase separation tendency of interconnected species from the reaction media and resultant porous structures. We believe that the present study can enable the design of template-free nanocrystal-based porous materials.
Collapse
Affiliation(s)
- Naoki Tarutani
- Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
- Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei, Tokyo 184-8584, Japan
| | - Mana Hashimoto
- Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - Takamasa Ishigaki
- Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei, Tokyo 184-8584, Japan
| |
Collapse
|
7
|
Rusch P, Zámbó D, Bigall NC. Control over Structure and Properties in Nanocrystal Aerogels at the Nano-, Micro-, and Macroscale. Acc Chem Res 2020; 53:2414-2424. [PMID: 33030336 PMCID: PMC7581295 DOI: 10.1021/acs.accounts.0c00463] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
![]()
The assembly
of individual colloidal nanocrystals into macroscopic
solvogels and aerogels introduced a new exciting type of material
into the class of porous architectures. In these so-called nanocrystal
gels, the structure and properties can be controlled and fine-tuned
to the smallest details. Recently it was shown that by employing nanocrystal
building blocks for such gel materials, the interesting nanoscopic
properties can be conserved or even expanded to properties that are
available neither in the nanocrystals nor in their respective bulk
materials. In general, the production of these materials features
the wet-chemical synthesis of stable nanocrystal colloids followed
by their carefully controlled destabilization to facilitate arrangement
of the nanocrystals into highly porous, interconnected networks. By
isolation of the synthesis of the discrete building blocks from the
assembly process, the electronic structure, optical properties, and
structural morphology can be tailored by the myriad of procedures
developed in colloidal nanocrystal chemistry. Furthermore, knowledge
and control over the structure–property correlation in the
resulting gel structures opens up numerous new ways for extended and
advanced applications. Consequently, the amount of different materials
converted to nanocrystal-based gel structures is rising steadily.
Meanwhile the number of methods for assembly initiation is likewise
increasing, offering control over the overall network structure and
porosity as well as the individual nanocrystal building block connection.
The resulting networks can be dried by different methods to obtain
highly porous air-filled networks (aerogels) or applied in their wet
form (solvogels). By now a number of different applications profiting
from the unique advantages of nanocrystal-based gel materials have
been realized and exploited in the areas of photocatalysis, electrocatalysis,
and sensing. In this Account, we aim to summarize the efforts
undertaken in
the structuring of nanocrystal-based network materials on different
scales, fine-tuning of the individual building blocks on the nanoscale,
the network connections on the microscale, and the macroscale structure
and shape of the final construct. It is exemplarily demonstrated how
cation exchange reactions (at the nanoscale), postgelation modifications
on the nanocrystal networks (microscale), and the structuring of the
gels via printing techniques (macroscale) endow the resulting nanocrystal
gel networks with novel physicochemical, mechanical, and electrocatalytic
properties. The methods applied in the more traditional sol–gel
chemistry targeting micro- and macroscale structuring are also reviewed,
showing their future potential promoting the field of nanocrystal-based
aerogels and their applications.
Collapse
Affiliation(s)
- Pascal Rusch
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
| | - Dániel Zámbó
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
| | - Nadja C. Bigall
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering − Innovation Across Disciplines), 30167 Hannover, Germany
| |
Collapse
|
8
|
Takemoto M, Tokudome Y, Noguchi D, Ueoka R, Kanamori K, Okada K, Murata H, Nakahira A, Takahashi M. Synthesis of a Crystalline and Transparent Aerogel Composed of Ni-Al Layered Double Hydroxide Nanoparticles through Crystallization from Amorphous Hydrogel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9436-9442. [PMID: 32683867 DOI: 10.1021/acs.langmuir.0c01292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Enormous efforts have been devoted to the development of crystalline aerogels toward heterogeneous catalysis, energy storage, ion/molecular absorption, and luminescence. However, properties of aerogels are not fully exploited due to their low content of functional moieties embedded in their solid networks, low crystallinity, and limited chemical compositions. Herein, we develop a one-pot approach based on crystallization from amorphous metal hydroxides modified with a β-diketone ligand, toward crystalline transition-metal hydroxide aerogels. Synthesis of monolithic and crystalline aerogels of layered double hydroxide (LDH) was performed in a Ni-Al system starting from aqueous ethanol solutions of NiCl2·6H2O and AlCl3·6H2O with acetylacetone (acac) as an organic ligand. Propylene oxide (PO) as an alkalization reagent was added into precursory solutions to yield monolithic wet gels. The successive pH increase induces the formation of a three-dimensional (3-D) solid framework composed of amorphous Al(OH)3. Then, amphoteric Al(OH)3 undergoes crystallization into Ni-Al LDH via an acetylacetone-driven dissolution-crystallization of metal hydroxides without destroying the preformed 3-D solid framework. The process allows us to obtain crystalline aerogel monoliths with high porosity and high transparency after supercritical CO2 drying of wet gels. The present scheme can be expected to synthesize functionalized aerogel composed of crystalline transition-metal oxide/hydroxide nanobuilding blocks (NBBs).
Collapse
Affiliation(s)
- Masanori Takemoto
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Yasuaki Tokudome
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Daisuke Noguchi
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Ryota Ueoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kenji Okada
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hidenobu Murata
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Atsushi Nakahira
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Masahide Takahashi
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| |
Collapse
|
9
|
Kreft S, Schoch R, Schneidewind J, Rabeah J, Kondratenko EV, Kondratenko VA, Junge H, Bauer M, Wohlrab S, Beller M. Improving Selectivity and Activity of CO2 Reduction Photocatalysts with Oxygen. Chem 2019. [DOI: 10.1016/j.chempr.2019.04.006] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
10
|
Advanced Design and Synthesis of Composite Photocatalysts for the Remediation of Wastewater: A Review. Catalysts 2019. [DOI: 10.3390/catal9020122] [Citation(s) in RCA: 137] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Serious water pollution and the exhausting of fossil resources have become worldwide urgent issues yet to be solved. Solar energy driving photocatalysis processes based on semiconductor catalysts is considered to be the most promising technique for the remediation of wastewater. However, the relatively low photocatalytic efficiency remains a critical limitation for the practical use of the photocatalysts. To solve this problem, numerous strategies have been developed for the preparation of advanced photocatalysts. Particularly, incorporating a semiconductor with various functional components from atoms to individual semiconductors or metals to form a composite catalyst have become a facile approach for the design of high-efficiency catalysts. Herein, the recent progress in the development of novel photocatalysts for wastewater treatment via various methods in the sight of composite techniques are systematically discussed. Moreover, a brief summary of the current challenges and an outlook for the development of composite photocatalysts in the area of wastewater treatment are provided.
Collapse
|
11
|
Freytag A, Günnemann C, Naskar S, Hamid S, Lübkemann F, Bahnemann D, Bigall NC. Tailoring Composition and Material Distribution in Multicomponent Cryoaerogels for Application in Photocatalysis. ACS APPLIED NANO MATERIALS 2018; 1:6123-6130. [PMID: 30506041 PMCID: PMC6256347 DOI: 10.1021/acsanm.8b01333] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 10/18/2018] [Indexed: 05/20/2023]
Abstract
In this article, we demonstrate the fabrication of tailored multicomponent cryoaerogels from colloidal nanoparticles via the cryogelation method. With this method, it is possible to control the amount of components very precisely. Furthermore, the microscopic distribution of the different nanoparticle components in the resulting monolithic structure is shown to be adjustable by simply mixing calculated amounts of colloidal nanoparticle solutions with a suitable surface charge. We focus on titania cryoaerogels due to their potential for optical applications and investigate the properties of synthesized titania-gold cryoaerogels in dependency of the composition. In addition, titania-platinum cryoaerogels were tested for photocatalytic applications such as hydrogen evolution and showed a significant increase in performance and stability compared to their respective colloidal solutions. While showing comparable results for hydrogen evolution with aerogels as reported in literature, the fabrication is much faster and less complex and therefore might enable future industrial application.
Collapse
Affiliation(s)
- Axel Freytag
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
| | - Carsten Günnemann
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
| | - Suraj Naskar
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
| | - Saher Hamid
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
- Laboratory
“Photoactive Nanocomposite Materials”, Saint-Petersburg State University, Ulyanovskaya str. 1, Peterhof, Saint-Petersburg 198504, Russia
| | - Franziska Lübkemann
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
| | - Detlef Bahnemann
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
- Laboratory
“Photoactive Nanocomposite Materials”, Saint-Petersburg State University, Ulyanovskaya str. 1, Peterhof, Saint-Petersburg 198504, Russia
| | - Nadja C. Bigall
- Institute of Physical Chemistry and Electrochemistry (PCI), Laboratory of Nano
and Quantum Engineering (LNQE), and Institute for Technical Chemistry, Leibniz Universität Hannover, D-30167 Hannover, Germany
- E-mail:
| |
Collapse
|
12
|
Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions. Proc Natl Acad Sci U S A 2018; 115:8925-8930. [PMID: 30127030 DOI: 10.1073/pnas.1806927115] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
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.
Collapse
|
13
|
Berestok T, Guardia P, Ibáñez M, Meyns M, Colombo M, Kovalenko MV, Peiró F, Cabot A. Electrostatic-Driven Gelation of Colloidal Nanocrystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9167-9174. [PMID: 30015491 DOI: 10.1021/acs.langmuir.8b01111] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The assembly of colloidal nanocrystals (NCs) is a unique strategy to produce porous materials with high crystallinity and unmatched control over structural and chemical parameters. This strategy has been demonstrated mostly for single-component nanomaterials. In the present work, we report the gelation of colloidal NC solutions driven by the electrostatic interaction of oppositely charged NCs. A key step for leading this strategy to success is to produce a stable colloidal solution of the positively charged component. We achieved this goal by functionalizing the NCs with inexpensive and nontoxic amino acids such as glutamine. We demonstrate the combination of positively and negatively charged NCs in proper concentrations to result in gels with a homogeneous distribution of the two compounds. In this way, porous nanocomposites with virtually any combination can be produced. We illustrate this approach by combining positively charged ceria NCs with negatively charged gold NCs to form Au-CeO2 gels. These gels were dried from supercritical CO2 to produce highly porous Au-CeO2 aerogels with specific surface areas of 120 m2 g-1. The formation of a proper interface is confirmed through the evaluation of nanocomposite catalytic activity toward CO oxidation. We further demonstrate the versatility of this strategy to produce porous metal chalcogenide-metal oxide and metal-metal chalcogenide nanocomposites by the examples of PbS-CeO2 and Au-PbS.
Collapse
Affiliation(s)
- Taisiia Berestok
- Catalonia Institute for Energy Research-IREC , Sant Adrià de Besòs 08930 , Barcelona , Spain
- LENS-MIND, Departament d'Enginyeria Electrònica I Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Pablo Guardia
- Catalonia Institute for Energy Research-IREC , Sant Adrià de Besòs 08930 , Barcelona , Spain
| | - Maria Ibáñez
- Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences , ETH Zürich , Zürich , CH-8093 , Switzerland
| | - Michaela Meyns
- Catalonia Institute for Energy Research-IREC , Sant Adrià de Besòs 08930 , Barcelona , Spain
| | - Massimo Colombo
- Nanochemistry Department , Istituto Italiano di Tecnologia , via Morego 30 , 16130 Genova , Italy
| | - Maksym V Kovalenko
- Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences , ETH Zürich , Zürich , CH-8093 , Switzerland
- EMPA-Swiss Federal Laboratories for Materials Science and Technology , Dübendorf , CH-8600 , Switzerland
| | - Francesca Peiró
- LENS-MIND, Departament d'Enginyeria Electrònica I Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (In2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Andreu Cabot
- Catalonia Institute for Energy Research-IREC , Sant Adrià de Besòs 08930 , Barcelona , Spain
- ICREA , Pg. Lluís Companys 23 , 08010 Barcelona , Spain
| |
Collapse
|
14
|
Cai B, Sayevich V, Gaponik N, Eychmüller A. Emerging Hierarchical Aerogels: Self-Assembly of Metal and Semiconductor Nanocrystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707518. [PMID: 29921028 DOI: 10.1002/adma.201707518] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 02/14/2018] [Indexed: 06/08/2023]
Abstract
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.
Collapse
Affiliation(s)
- Bin Cai
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Vladimir Sayevich
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Nikolai Gaponik
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Alexander Eychmüller
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| |
Collapse
|
15
|
Berestok T, Guardia P, Du R, Portals JB, Colombo M, Estradé S, Peiró F, Brock SL, Cabot A. Metal Oxide Aerogels with Controlled Crystallinity and Faceting from the Epoxide-Driven Cross-Linking of Colloidal Nanocrystals. ACS APPLIED MATERIALS & INTERFACES 2018; 10:16041-16048. [PMID: 29672016 DOI: 10.1021/acsami.8b03754] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present a novel method to produce crystalline oxide aerogels which is based on the cross-linking of preformed colloidal nanocrystals (NCs) triggered by propylene oxide (PO). Ceria and titania were used to illustrate this new approach. Ceria and titania colloidal NCs with tuned geometry and crystal facets were produced in solution from the decomposition of a suitable salt in the presence of oleylamine (OAm). The native surface ligands were replaced by amino acids, rendering the NCs colloidally stable in polar solvents. The NC colloidal solution was then gelled by adding PO, which gradually stripped the ligands from the NC surface, triggering a slow NC aggregation. NC-based metal oxide aerogels displayed both high surface areas and excellent crystallinity associated with the crystalline nature of the constituent building blocks, even without any annealing step. Such NC-based metal oxide aerogels showed higher thermal stability compared with aerogels directly produced from ionic precursors using conventional sol-gel chemistry strategies.
Collapse
Affiliation(s)
- Taisiia Berestok
- Catalonia Institute for Energy Research-IREC , 08930 Sant Adrià de Besòs, Barcelona , Spain
- LENS-MIND, Departament d'Enginyeria Electrònica I Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Pablo Guardia
- Catalonia Institute for Energy Research-IREC , 08930 Sant Adrià de Besòs, Barcelona , Spain
| | - Ruifeng Du
- Catalonia Institute for Energy Research-IREC , 08930 Sant Adrià de Besòs, Barcelona , Spain
| | - Javier Blanco Portals
- LENS-MIND, Departament d'Enginyeria Electrònica I Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (In2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Massimo Colombo
- Nanochemistry Department , Istituto Italiano di Tecnologia , via Morego 30 , 16130 Genova , Italy
| | - Sònia Estradé
- LENS-MIND, Departament d'Enginyeria Electrònica I Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (In2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Francesca Peiró
- LENS-MIND, Departament d'Enginyeria Electrònica I Biomèdica , Universitat de Barcelona , 08028 Barcelona , Spain
- Institute of Nanoscience and Nanotechnology (In2UB) , Universitat de Barcelona , 08028 Barcelona , Spain
| | - Stephanie L Brock
- Department of Chemistry , Wayne State University , Detroit , Michigan 48202 , United States
| | - Andreu Cabot
- Catalonia Institute for Energy Research-IREC , 08930 Sant Adrià de Besòs, Barcelona , Spain
- ICREA , Pg. Lluís Companys 23 , 08010 Barcelona , Spain
| |
Collapse
|
16
|
Yang Y, Xie Q, Mukherjee S, Zheng Y, Yan X, Yan J, Liu J, Fang Y. Preparation of crystal TiO 2 foam with micron channels and mesopores by a freeze-casting method without additives and unidirectional freezing. CrystEngComm 2018. [DOI: 10.1039/c8ce01120f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel strategy facilitated by self-assembly of a ligand to prepare crystal TiO2 foam with micron channels and mesopores.
Collapse
Affiliation(s)
- Yingchao Yang
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Qing Xie
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Somnath Mukherjee
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Yan Zheng
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Xiangyang Yan
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Junlin Yan
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Jing Liu
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| | - Yu Fang
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710119
| |
Collapse
|
17
|
Jiang S, Agarwal S, Greiner A. Offenzellige Schwämme mit niedrigen Dichten als Funktionsmaterialien. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700684] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shaohua Jiang
- Makromolekulare Chemie II, Bayerisches Polymerinstitut; Universität Bayreuth; Universitätsstraße 30 95440 Bayreuth Deutschland
- College of Materials Science and Engineering; Nanjing Forestry University; Nanjing 210037 China
| | - Seema Agarwal
- Makromolekulare Chemie II, Bayerisches Polymerinstitut; Universität Bayreuth; Universitätsstraße 30 95440 Bayreuth Deutschland
| | - Andreas Greiner
- Makromolekulare Chemie II, Bayerisches Polymerinstitut; Universität Bayreuth; Universitätsstraße 30 95440 Bayreuth Deutschland
| |
Collapse
|
18
|
Abstract
Low-density macroporous sponges with densities less than 100 mg cm-3 are both a challenge and an opportunity for advanced chemistry and material science. The challenge lies in the precise preparation of the sponges with property combinations that lead to novel applications. Bottom-up and top-down chemical and engineering methods for the preparation of sponges are a major focus of this Review, with an emphasis on carbon and polymer materials. The light weight, sustainability, breathability, special wetting characteristics, large mass transfer, mechanical stability, and large pore volume are typical characteristics of sponges made of advanced materials and could lead to novel applications. Some selected sponge properties and potential applications are discussed.
Collapse
Affiliation(s)
- Shaohua Jiang
- Macromolecular Chemistry II, Department of Chemistry, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany.,College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Seema Agarwal
- Macromolecular Chemistry II, Department of Chemistry, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany
| | - Andreas Greiner
- Macromolecular Chemistry II, Department of Chemistry, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany
| |
Collapse
|
19
|
Ziegler C, Wolf A, Liu W, Herrmann AK, Gaponik N, Eychmüller A. Moderne Anorganische Aerogele. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611552] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Christoph Ziegler
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 639798 Singapur
| | - André Wolf
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Wei Liu
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Anne-Kristin Herrmann
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Nikolai Gaponik
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Alexander Eychmüller
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| |
Collapse
|
20
|
Ziegler C, Wolf A, Liu W, Herrmann AK, Gaponik N, Eychmüller A. Modern Inorganic Aerogels. Angew Chem Int Ed Engl 2017; 56:13200-13221. [DOI: 10.1002/anie.201611552] [Citation(s) in RCA: 221] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Indexed: 12/17/2022]
Affiliation(s)
- Christoph Ziegler
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
- Present address: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 639798 Singapore
| | - André Wolf
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Wei Liu
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Anne-Kristin Herrmann
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Nikolai Gaponik
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Alexander Eychmüller
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| |
Collapse
|
21
|
Deshmukh R, Niederberger M. Mechanistic Aspects in the Formation, Growth and Surface Functionalization of Metal Oxide Nanoparticles in Organic Solvents. Chemistry 2017; 23:8542-8570. [DOI: 10.1002/chem.201605957] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Rupali Deshmukh
- Laboratory for Multifunctional Materials, Department of Materials; ETH Zürich; Vladimir-Prelog-Weg 5 8093 Zürich Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional Materials, Department of Materials; ETH Zürich; Vladimir-Prelog-Weg 5 8093 Zürich Switzerland
| |
Collapse
|
22
|
Rechberger F, Mercandetti C, Tervoort E, Niederberger M. Colloidal Nanocrystal-Based BaTiO 3 Xerogels as Green Bodies: Effect of Drying and Sintering at Low Temperatures on Pore Structure and Microstructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:280-287. [PMID: 27977210 DOI: 10.1021/acs.langmuir.6b03961] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Although aerogels prepared by the colloidal assembly of nanoparticles are a rapidly emerging class of highly porous and low-density materials, their ambient dried counterparts, namely xerogels, have hardly been explored. Here we report the use of nanoparticle-based BaTiO3 xerogels as green bodies, which provide a versatile route to ceramic materials under the minimization of organic additives with a significant reduction of the calcination temperature compared to that of conventional powder sintering. The structural changes of the xerogels are investigated during ambient drying by carefully analyzing the microstructure at different drying stages. For this purpose, the shrinkage was arrested by a supercritical drying step under full preservation of the intermediate microstructure, giving unprecedented insight into the structural changes during ambient drying of a nanoparticle-based gel. In a first step, the large macropores shrink because of capillary forces, followed by the collapse of residual mesopores until a dense xerogel is obtained. The whole process is accompanied by a volume shrinkage of 97% and a drop in surface area from 300 to 220 m2 g-1. Finally, the xerogels are sintered, causing another shrinkage of up to 8% with a slight increase in the average pore and crystal sizes. At temperatures higher than 700 °C, an unexpected phase transition to BaTi2O5 is observed.
Collapse
Affiliation(s)
- Felix Rechberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland
| | - Cristina Mercandetti
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland
| | - Elena Tervoort
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland
| |
Collapse
|
23
|
Bärtsch M, Niederberger M. The Role of Interfaces in Heterostructures. Chempluschem 2017; 82:42-59. [DOI: 10.1002/cplu.201600519] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 12/16/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Mario Bärtsch
- Laboratory for Multifunctional Materials; Department of Materials; ETH Zürich; Vladimir-Prelog-Weg 5 8093 Zürich Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional Materials; Department of Materials; ETH Zürich; Vladimir-Prelog-Weg 5 8093 Zürich Switzerland
| |
Collapse
|
24
|
Wen D, Eychmüller A. 3D assembly of preformed colloidal nanoparticles into gels and aerogels: function-led design. Chem Commun (Camb) 2017; 53:12608-12621. [DOI: 10.1039/c7cc03862c] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nanoparticle-based aerogels combine the properties of traditional aerogels with those of nanoparticles, and hold promise for various applications following a function-led design.
Collapse
Affiliation(s)
- Dan Wen
- Center for Nano Energy Materials
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi’an 710072
- China
| | | |
Collapse
|
25
|
Rechberger F, Niederberger M. Synthesis of aerogels: from molecular routes to 3-dimensional nanoparticle assembly. NANOSCALE HORIZONS 2017; 2:6-30. [PMID: 32260673 DOI: 10.1039/c6nh00077k] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Colloidal nanocrystals are extensively used as building blocks in nanoscience, and amazing results have been achieved in assembling them into ordered, close-packed structures. But in spite of great efforts, the size of these structures is typically restricted to a few micrometers, and it is very hard to extend them into the macroscopic world. In comparison, aerogels are macroscopic materials, highly porous, disordered, ultralight and with immense surface areas. With these distinctive characteristics, they are entirely contrary to common nanoparticle assemblies such as superlattices or nanocrystal solids, and therefore cover a different range of applications. While aerogels are traditionally synthesized by molecular routes based on aqueous sol-gel chemistry, in the last few years the gelation of nanoparticle dispersions became a viable alternative to improve the crystallinity and to widen the structural, morphological and compositional complexity of aerogels. In this Review, the different approaches to inorganic non-siliceous and non-carbon aerogels are addressed. We start our discussion with wet chemical routes involving molecular precursors, followed by processing methods using nanoparticles as building blocks. A unique feature of many of these routes is the fact that a macroscopic, often monolithic body is produced by pure self-assembly of nanosized colloids without the need for any templates.
Collapse
Affiliation(s)
- Felix Rechberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland.
| | | |
Collapse
|
26
|
Cheng W, Rechberger F, Niederberger M. Three-Dimensional Assembly of Yttrium Oxide Nanosheets into Luminescent Aerogel Monoliths with Outstanding Adsorption Properties. ACS NANO 2016; 10:2467-2475. [PMID: 26756944 DOI: 10.1021/acsnano.5b07301] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The preparation of macroscopic materials from two-dimensional nanostructures represents a great challenge. Restacking and random aggregation to dense structures during processing prevents the preservation of the two-dimensional morphology of the nanobuilding blocks in the final body. Here we present a facile solution route to ultrathin, crystalline Y2O3 nanosheets, which can be assembled into a 3D network by a simple centrifugation-induced gelation method. The wet gels are converted into aerogel monoliths of macroscopic dimensions via supercritical drying. The as-prepared, fully crystalline Y2O3 aerogels show high surface areas of up to 445 m(2)/g and a very low density of 0.15 g/cm(3), which is only 3% of the bulk density of Y2O3. By doping and co-doping the Y2O3 nanosheets with Eu(3+) and Tb(3+), we successfully fabricated luminescent aerogel monoliths with tunable color emissions from red to green under UV excitation. Moreover, the as-prepared gels and aerogels exhibit excellent adsorption capacities for organic dyes in water without losing their structural integrity. For methyl blue we measured an unmatched adsorption capacity of 8080 mg/g. Finally, the deposition of gold nanoparticles on the nanosheets gave access to Y2O3-Au nanocomposite aerogels, proving that this approach may be used for the synthesis of catalytically active materials. The broad range of properties including low density, high porosity, and large surface area in combination with tunable photoluminescence makes these Y2O3 aerogels a truly multifunctional material with potential applications in optoelectronics, wastewater treatment, and catalysis.
Collapse
Affiliation(s)
- Wei Cheng
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Felix Rechberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Markus Niederberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| |
Collapse
|
27
|
Deshmukh R, Tervoort E, Käch J, Rechberger F, Niederberger M. Assembly of ultrasmall Cu3N nanoparticles into three-dimensional porous monolithic aerogels. Dalton Trans 2016; 45:11616-9. [DOI: 10.1039/c6dt01451h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We present the assembly of ultrasmall Cu3N nanoparticles into aerogels with a high surface area and porosity by thermally destabilizing colloidal nanoparticles.
Collapse
Affiliation(s)
- Rupali Deshmukh
- Laboratory of Multifunctional Materials
- Department of Materials
- ETH Zurich
- 8093 Zurich
- Switzerland
| | - Elena Tervoort
- Laboratory of Multifunctional Materials
- Department of Materials
- ETH Zurich
- 8093 Zurich
- Switzerland
| | - Julian Käch
- Laboratory of Multifunctional Materials
- Department of Materials
- ETH Zurich
- 8093 Zurich
- Switzerland
| | - Felix Rechberger
- Laboratory of Multifunctional Materials
- Department of Materials
- ETH Zurich
- 8093 Zurich
- Switzerland
| | - Markus Niederberger
- Laboratory of Multifunctional Materials
- Department of Materials
- ETH Zurich
- 8093 Zurich
- Switzerland
| |
Collapse
|
28
|
|
29
|
Zeng G, Shi N, Hess M, Chen X, Cheng W, Fan T, Niederberger M. A general method of fabricating flexible spinel-type oxide/reduced graphene oxide nanocomposite aerogels as advanced anodes for lithium-ion batteries. ACS NANO 2015; 9:4227-4235. [PMID: 25783818 DOI: 10.1021/acsnano.5b00576] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High-capacity anode materials for lithium ion batteries (LIBs), such as spinel-type metal oxides, generally suffer from poor Li(+) and e(-) conductivities. Their drastic crystal structure and volume changes, as a result of the conversion reaction mechanism with Li, severely impede the high-rate and cyclability performance toward their practical application. In this article, we present a general and facile approach to fabricate flexible spinel-type oxide/reduced graphene oxide (rGO) composite aerogels as binder-free anodes where the spinel nanoparticles (NPs) are integrated in an interconnected rGO network. Benefiting from the hierarchical porosity, conductive network and mechanical stability constructed by interpenetrated rGO layers, and from the pillar effect of NPs in between rGO sheets, the hybrid system synergistically enhances the intrinsic properties of each component, yet is robust and flexible. Consequently, the spinel/rGO composite aerogels demonstrate greatly enhanced rate capability and long-term stability without obvious capacity fading for 1000 cycles at high rates of up to 4.5 A g(-1) in the case of CoFe2O4. This electrode design can successfully be applied to several other spinel ferrites such as MnFe2O4, Fe3O4, NiFe2O4 or Co3O4, all of which lead to excellent electrochemical performances.
Collapse
Affiliation(s)
- Guobo Zeng
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| | - Nan Shi
- ‡State Key Laboratory of Metal Matrix Composites, Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Michael Hess
- §Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland
| | - Xi Chen
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| | - Wei Cheng
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| | - Tongxiang Fan
- ‡State Key Laboratory of Metal Matrix Composites, Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Markus Niederberger
- †Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland
| |
Collapse
|
30
|
|
31
|
Heiligtag FJ, Airaghi Leccardi MJI, Erdem D, Süess MJ, Niederberger M. Anisotropically structured magnetic aerogel monoliths. NANOSCALE 2014; 6:13213-21. [PMID: 25255203 DOI: 10.1039/c4nr04694c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Texturing of magnetic ceramics and composites by aligning and fixing of colloidal particles in a magnetic field is a powerful strategy to induce anisotropic chemical, physical and especially mechanical properties into bulk materials. If porosity could be introduced, anisotropically structured magnetic materials would be the perfect supports for magnetic separations in biotechnology or for magnetic field-assisted chemical reactions. Aerogels, combining high porosity with nanoscale structural features, offer an exceptionally large surface area, but they are difficult to magnetically texture. Here we present the preparation of anatase-magnetite aerogel monoliths via the assembly of preformed nanocrystallites. Different approaches are proposed to produce macroscopic bodies with gradient-like magnetic segmentation or with strongly anisotropic magnetic texture.
Collapse
Affiliation(s)
- Florian J Heiligtag
- Laboratory of Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland.
| | | | | | | | | |
Collapse
|
32
|
Rechberger F, Ilari G, Niederberger M. Assembly of antimony doped tin oxide nanocrystals into conducting macroscopic aerogel monoliths. Chem Commun (Camb) 2014; 50:13138-41. [DOI: 10.1039/c4cc05648e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
33
|
Rechberger F, Heiligtag FJ, Süess MJ, Niederberger M. Assembly of BaTiO3Nanocrystals into Macroscopic Aerogel Monoliths with High Surface Area. Angew Chem Int Ed Engl 2014; 53:6823-6. [DOI: 10.1002/anie.201402164] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 04/24/2014] [Indexed: 01/01/2023]
|
34
|
Rechberger F, Heiligtag FJ, Süess MJ, Niederberger M. Anordnung von BaTiO3-Nanokristallen zu makroskopischen Aerogelmonolithen mit großer Oberfläche. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
35
|
Raju M, van Duin ACT, Fichthorn KA. Mechanisms of oriented attachment of TiO2 nanocrystals in vacuum and humid environments: reactive molecular dynamics. NANO LETTERS 2014; 14:1836-1842. [PMID: 24601782 DOI: 10.1021/nl404533k] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Oriented attachment (OA) of nanocrystals is now widely recognized as a key process in the solution-phase growth of hierarchical nanostructures. However, the microscopic origins of OA remain unclear. We perform molecular dynamics simulations using a recently developed ReaxFF reactive force field to study the aggregation of various titanium dioxide (anatase) nanocrystals in vacuum and humid environments. In vacuum, the nanocrystals merge along their direction of approach, resulting in a polycrystalline material. By contrast, in the presence of water vapor the nanocrystals reorient themselves and aggregate via the OA mechanism to form a single or twinned crystal. They accomplish this by creating a dynamic network of hydrogen bonds between surface hydroxyls and surface oxygens of aggregating nanocrystals. We determine that OA is dominant on surfaces that have the greatest propensity to dissociate water. Our results are consistent with experiment, are likely to be general for aqueous oxide systems, and demonstrate the critical role of solvent in nanocrystal aggregation. This work opens up new possibilities for directing nanocrystal growth to fabricate nanomaterials with desired shapes and sizes.
Collapse
Affiliation(s)
- Muralikrishna Raju
- Department of Physics, ‡Department of Mechanical and Nuclear Engineering, and §Department of Chemical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802
| | | | | |
Collapse
|
36
|
Byeon JH, Kim YW. Au-TiO(2) nanoscale heterodimers synthesis from an ambient spark discharge for efficient photocatalytic and photothermal activity. ACS APPLIED MATERIALS & INTERFACES 2014; 6:763-767. [PMID: 24380507 DOI: 10.1021/am405004a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ultrafine Au particles incorporating TiO2 heterodimers were synthesized using an ambient heterogeneous spark discharge and the resultant materials were employed both in oxidizing photocatalytically CO gas and killing photothermally cancerous cells. Ti-Au spark configuration was employed to vaporize Ti and Au components into an airflow and finally ultrafine Au particles (∼2 nm in lateral dimension) were incorporated with TiO2 nanoparticles in the form of Au-TiO2 heterodimers (∼38 nm in lateral dimension) with enhanced photocatalytic (in CO oxidation) and photothermal activity (in cancerous cell killing) under visible light. We propose that the localized surface plasmon resonance of ultrafine Au particles on TiO2 supports, induced by the visible light, would promote the adsorption-oxidation of CO and photothermal killing of HeLa cells. The present strategy may be suitable to fabricate other Au-metal oxide nanocomposites for catalytic and biomedical applications.
Collapse
Affiliation(s)
- Jeong Hoon Byeon
- Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States
| | | |
Collapse
|
37
|
Koziej D, Lauria A, Niederberger M. 25th anniversary article: metal oxide particles in materials science: addressing all length scales. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:235-257. [PMID: 24254990 DOI: 10.1002/adma.201303161] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 09/08/2013] [Indexed: 06/02/2023]
Abstract
The fundamental mission of materials science is the description of matter over all length scales. In this review, we apply this concept to particle research. Based on metal oxides, we show that every size range offers its specific features, and every size range had its era, when it was in the center of the research activities. In the first part of the review, we discuss on three metal oxides as examples, how and why the research focus changed its targeted size regime from the micrometer to the nanometer scale and back to the macroscopic world. Next, we present the distinct advantages of using nanoparticles over micrometer-sized particles in selected devices and we point out how such a shift in the size regime opens up new research directions. Finally, we exemplify the methods to introduce nanoparticles into macroscopic objects to make functional ceramics.
Collapse
Affiliation(s)
- Dorota Koziej
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093, Zürich, Switzerland
| | | | | |
Collapse
|
38
|
Zhu Z, Guo J, Liu W, Li Z, Han B, Zhang W, Tang Z. Controllable Optical Activity of Gold Nanorod and Chiral Quantum Dot Assemblies. Angew Chem Int Ed Engl 2013; 52:13571-5. [DOI: 10.1002/anie.201305389] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Indexed: 11/05/2022]
|
39
|
Zhu Z, Guo J, Liu W, Li Z, Han B, Zhang W, Tang Z. Controllable Optical Activity of Gold Nanorod and Chiral Quantum Dot Assemblies. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305389] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
40
|
Xia H, Yang G. Facile synthesis of inorganic nanoparticles by a precipitation method in molten ε-caprolactam solvent. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm34333a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
41
|
Fröschl T, Hörmann U, Kubiak P, Kučerová G, Pfanzelt M, Weiss CK, Behm RJ, Hüsing N, Kaiser U, Landfester K, Wohlfahrt-Mehrens M. High surface area crystalline titanium dioxide: potential and limits in electrochemical energy storage and catalysis. Chem Soc Rev 2012; 41:5313-60. [DOI: 10.1039/c2cs35013k] [Citation(s) in RCA: 367] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|