Nanoplatelet cryoaerogels with potential application in photoelectrochemical sensing

Schlosser, Anja; Meyer, L.; Lübkemann, Franziska; Miethe, Jan F.; Bigall, Nadja C.

doi:10.1039/c9cp00281b

Cited by 33 publications

(105 citation statements)

References 55 publications

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“…In contrast to conventional techniques (dip‐coating, spin‐coating, spray‐coating) the inkjet printing process exhibits benefits of faster manufacturability, a lower material to sample casualty rate, and the production of defined areas with less coating material. Plenty of scientists are using inkjet printing for the deposition of metal NCs or semiconductor NCs to manufacture structured electronic components for chip design and sensing . In addition, some works on laser induced 3D printing for the fabrication of porous materials can be found .…”

Section: Introductionmentioning

confidence: 99%

“…Since the development of nanoparticle based aerogel structures, there is a high interest in these self‐assembled 3D nanoparticle networks and in exploiting their suitability in different fields, e.g. photocatalysis, electrocatalysis, and photo‐electrochemical application like sensing . By controlling the destabilization process of the nanocrystals, it is possible to obtain nanoparticle networks in which the nanoparticles are connected to each other in a defined way .…”

Section: Introductionmentioning

confidence: 99%

“…Plenty of scientists are using inkjet printing for the deposition of metal NCs [1][2][3] or semiconductor NCs [4][5][6][7][8][9] to manufacture structured electronic components for chip design and sensing. [6,[10][11][12] In addition, some works on laser induced 3D printing for the fabrication of porous materials can be found. [13,14] Semiconductor NCs are of high interest, since the interconnection of crystal size, and shape and the opto electronic pro perties defined by the quantum confinement effects diversifies the field of obtainable systems.…”

mentioning

confidence: 99%

“…photo catalysis, [20][21][22] electrocatalysis, [23,24] and photo-electrochemical application like sensing. [12,25] By controlling the destabilization process of the nanocrystals, it is possible to obtain nanoparticle networks in which the nanoparticles are connected to each other in a defined way. [26][27][28][29][30][31][32] Nevertheless, there is a lack of possible techniques for forming these highly porous 3D aerogels into defined macroscopic shapes and patterns on conducting surfaces to make them suitable for spectro-electrochemical measurements or sensing application.…”

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confidence: 99%

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Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Lübkemann

Miethe

Steinbach

et al. 2019

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Nanoparticle‐based voluminous 3D networks with low densities are a unique class of materials and are commonly known as aerogels. Due to the high surface‐to‐volume ratio, aerogels and xerogels might be suitable materials for applications in different fields, e.g. photocatalysis, catalysis, or sensing. One major difficulty in the handling of nanoparticle‐based aerogels and xerogels is the defined patterning of these structures on different substrates and surfaces. The automated manufacturing of nanoparticle‐based aerogel‐ or xerogel‐coated electrodes can easily be realized via inkjet printing. The main focus of this work is the implementation of the standard nanoparticle‐based gelation process in a commercial inkjet printing system. By simultaneously printing semiconductor nanoparticles and a destabilization agent, a 3D network on a conducting and transparent surface is obtained. First spectro‐electrochemical measurements are recorded to investigate the charge–carrier mobility within these 3D semiconductor‐based xerogel networks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Lübkemann

Miethe

Steinbach

et al. 2019

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“…Control over the physical and physicochemical properties of semiconductor nanoparticles and their superstructures have become a cornerstone of the related research fields since the development of the modern synthesis methods of these novel nanoparticles. [ 1 ] Nowadays, fine‐tuning of shape, size, surface chemistry, and optical properties of semiconductor nanocrystals can be achieved precisely, and the variety of appearance and functionality of the nanoparticles has extended the application possibilities of this material class in the fields of sensing, [ 2,3 ] energy harvesting, [ 4 ] (photo)catalysis, [ 5,6 ] photovoltaics, [ 7 ] and biomedicine. [ 8 ] Metal chalcogenides are excellent candidates for fulfilling the requirements of the above‐mentioned fields of applications, due to the well‐known quantum size effect emerging in their systems consisting of nanoscaled building blocks.…”

Section: Introductionmentioning

confidence: 99%

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations

Zámbó

Schlosser

Rusch

et al. 2020

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can be achieved precisely, and the variety of appearance and functionality of the nanoparticles has extended the application possibilities of this material class in the fields of sensing, [2,3] energy harvesting, [4] (photo) catalysis, [5,6] photovoltaics, [7] and biomedicine. [8] Metal chalcogenides are excellent candidates for fulfilling the requirements of the above-mentioned fields of applications, due to the well-known quantum size effect emerging in their systems consisting of nanoscaled building blocks. This phenomenon endows these nanoparticle systems with unique and tunable optical properties. [9] The most widely used class of semiconductor nanoparticles is cadmiumchalcogenides, especially the CdSe/CdS and CdSe/CdTe heteroparticles in diverse size, shape, and functionality. [10] Most importantly, the high surface-to-volume ratio of nanocrystals further enhances the activity and applicability of them. Nevertheless, there are numerous fields, where liquid-based nanoparticle systems cannot be utilized, that has enhanced the development of different self-assembly procedures providing supported or non-supported superstructures. Two main objectives govern the preparation of these assemblies: i) the preservation of the individual nanocrystal properties and ii) the extension of these optical and physicochemical properties in the self-assembled nanosystems to pave the way toward new applications. In other words, novel nanoparticlebased superstructures should combine the properties of the building blocks and the emerging new features that can be 3D nanoparticle assemblies offer a unique platform to enhance and extend the functionality and optical/electrical properties of individual nanoparticles. Especially, a self-supported, voluminous, and porous macroscopic material built up from interconnected semiconductor nanoparticles provides new possibilities in the field of sensing, optoelectronics, and photovoltaics. Herein, a method is demonstrated for assembling semiconductor nanoparticle systems containing building blocks possessing different composition, size, shape, and surface ligands. The method is based on the controlled destabilization of the particles triggered by trivalent cations (Y 3+ , Yb 3+ , and Al 3+ ). The effect of the cations is investigated via X-ray photoelectron spectroscopy. The macroscopic, self-supported aerogels consist of the hyperbranched network of interconnected CdSe/ CdS dot-in-rods, or CdSe/CdS as well as CdSe/CdTe core-crown nanoplatelets is used to demonstrate the versatility of the procedure. The non-oxidative assembly method takes place at room temperature without thermal activation in several hours and preserves the shape and the fluorescence of the building blocks. The assembled nanoparticle network provides longer exciton lifetimes with retained photoluminescence quantum yields, that make these nanostructured materials a perfect platform for novel multifunctional 3D networks in sensing. Various sets of photoelectrochemical measurements on the interconnected semiconductor nanorod s...

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Spatial Extent of Fluorescence Quenching in Mixed Semiconductor–Metal Nanoparticle Gel Networks

Rosebrock

Zámbó

Rusch

et al. 2021

Adv Funct Materials

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In this work, mixing and co-gelation of Au nanoparticles (NPs) and highly luminescent CdSe/CdS core/shell nanorods (NRs) are used as tools to obtain noble metal particle-decorated macroscopic semiconductor gel networks. The hybrid nature of the macrostructures facilitates the control over the optical properties: while the holes are trapped in the CdSe cores, the connected CdSe/CdS NRs support the mobility of excited electrons throughout the porous, hyperbranched gel networks. Due to the presence of Au NPs in the mixed gels, electron trapping in the gold NPs leads to a suppressed radiative recombination, namely, quenches the fluorescence in certain fragments of the multicomponent gel. The extent of fluorescence quenching can be influenced by the quantity of the noble metal domains. The optical properties are monitored as a function of the NR:NP ratio of a model system CdSe/CdS:Au. By this correlation, it demonstrates that the spatial extent of quenching initiated by a single Au NP exceeds the dimensions of one NR, which the Au is connected to (with a length of 45.8 nm ± 4.1 nm) and can reach the number of nine NRs per Au NP, which roughly corresponds to 400 nm of total electron travel distance within the network structure.

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Nanoplatelet cryoaerogels with potential application in photoelectrochemical sensing

Abstract: Photoelectrodes based on CdSe nanoplatelet cryoaerogels are prepared and the charge carrier transport within these structures is investigated photoelectrochemically.

Cited by 33 publications

References 55 publications

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

Patterning of Nanoparticle‐Based Aerogels and Xerogels by Inkjet Printing

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations

Spatial Extent of Fluorescence Quenching in Mixed Semiconductor–Metal Nanoparticle Gel Networks

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