Sacrificial layer electrophoretic deposition of free-standing multilayered nanoparticle films

Hasan, Saad A.; Kavich, Dustin W.; Dickerson, James H.

doi:10.1039/b902622c

Cited by 40 publications

(33 citation statements)

References 33 publications

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“…Because the work was performed on a lab-scale basis, batch-wise green film deposition techniques like spin coating of stabilized ceramic suspensions and Langmuir-Blodgett dip coating of monolayers of particles were used. However, automatable deposition techniques like tape casting, 15 electrophoretic deposition, 16 or traditional dip coating 1,17 could also be used for the green film deposition and appear more suited for possible largescale fabrication in a later stage. For the Langmuir-Blodgett dip coating of monolayers of powder particles, ethanol-water suspensions of hydrophobized alumina particles were dropped onto a water surface.…”

Section: Resultsmentioning

confidence: 99%

Free‐Standing Ultrathin Ceramic Foils

Bonderer

Chen

Kocher

et al. 2010

Journal of the American Ceramic Society

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Ceramic thin films are used in various applications for their structural or functional properties. Below a thickness of approximately 25 μm, ceramic films are typically deposited, sintered, and used on a supporting substrate due to their fragility. Here, we present a set of easy and versatile green film deposition and sintering techniques that allow the fabrication of free‐standing micrometer‐thin alumina and yttria‐stabilized zirconia foils. Because of their extremely low thickness, the foils were transparent and flexible but still strong enough that they were self‐supporting and could be handled manually. The presented concepts are not limited to the materials used here and can potentially be extended to most ceramic materials and glasses. So prepared free‐standing ultrathin ceramic foils allow new assembly and fabrication methods of devices and novel materials that contain thin ceramic membranes.

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Section: Resultsmentioning

confidence: 99%

Free‐Standing Ultrathin Ceramic Foils

Bonderer

Chen

Kocher

et al. 2010

Journal of the American Ceramic Society

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“…Freestanding 2D nanoparticle arrays not only offer a new type of ultrathin, robust, and flexible material, but also enable the study of substrate‐free optical and electrical properties 16. Thus far, freestanding nanoparticle membranes have been fabricated by embedding them in polymers,17, 18 crosslinking,19, 20 sintering,21 layer‐by‐layer assembly,22 and electrophoretic deposition 23. These nanoparticle membranes, however, either lack the packing order or lose the intrinsic features of nanoparticle superlattices.…”

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confidence: 99%

Fabrication, Transfer, and Transport Properties of Monolayered Freestanding Nanoparticle Sheets

Liao

Zhou

Huang

et al. 2011

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Nanoparticles, often referred to as 'artifi cial atoms', can be arranged into 1D, [ 1 , 2 ] 2D, [3][4][5][6] and 3D assemblies, [ 7 , 8 ] in analogy to the formation of crystals by atoms and molecules in nature. These artifi cial solids exhibit unique collective optical, [ 9 ] electrical, [10][11][12] and magnetic properties, [ 13 ] which stem from the novel electronic properties of the individual nanoparticles and the coupling between neighboring building blocks. [ 14 ] Motivated by fundamental and practical interests, researchers have developed various techniques to assemble 2D nanoparticle arrays and investigated their properties. [ 9 , 12 , 15 ] Freestanding 2D nanoparticle arrays not only offer a new type of ultrathin, robust, and fl exible material, but also enable the study of substrate-free optical and electrical properties. [ 16 ] Thus far, freestanding nanoparticle membranes have been fabricated by embedding them in polymers, [ 17 , 18 ] crosslinking, [ 19 , 20 ] sintering, [ 21 ] layer-by-layer assembly, [ 22 ] and electrophoretic deposition. [ 23 ] These nanoparticle membranes, however, either lack the packing order or lose the intrinsic features of nanoparticle superlattices. Impressive progress has been made by two groups. Jaeger and co-workers self-assembled freestanding, close-packed nanoparticle arrays over prefabricated holes. [ 24 , 25 ] Interactions between ligand molecules rendered the fi lms freestanding without the need for polymer encapsulation or ligand crosslinking. This method is also applicable to binary nanocrystal superlattices. [ 26 ] Luo and co-workers demonstrated another strategy to fabricate freestanding nanoparticle superlattices, using DNA molecules as ligands. [ 27 ] Both groups characterized the mechanical properties of as-prepared freestanding nanoparticle arrays. Despite these advances, measurement of the substrate-free transport properties of freestanding nanoparticle superlattices requires techniques to manipulate them and integrate them into solid-state devices, although it remains a great experimental challenge.Herein, we present a feasible route for the preparation, transfer, and electrical measurements of monolayered freestanding nanoparticle sheets. Under a gas fl ow, freestanding nanoparticle arrays can be transferred from microgrids onto arbitrary solid substrates. We measured the electronic transport properties of nanoparticle sheets suspended over trenches, and found the scaling exponent to be signifi cantly different from that of substrate-supported nanoparticle arrays prepared by the same technique. Our method enables the investigation of the intrinsic transport properties of artifi cial assemblies and paves the way towards device applications of freestanding nanoparticle arrays. Figure 1 a shows a schematic representation of the homemade experimental setup used to prepare monolayered freestanding nanoparticle sheets over a microgrid. For the convenience of transmission electron microscopy (TEM) characterization, we used TEM grids. In our confi guration...

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“…16,17 Colloidal suspensions of the QDs are prepared by diluting the as received material in 10 ml of hexane. The QDs deposit onto indium tin oxide substrates (R s ¼ 15-25 X; Delta Technologies), separated by a 5 mm gap in a parallel-plate capacitor configuration.…”

Section: Methodsmentioning

confidence: 99%

Increased photo-stability of quantum dots in segregated bilayer films

Shcherbatyuk

Talbot

Mandal

et al. 2013

Journal of Applied Physics

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Articles you may be interested inDetermining the exact number of dye molecules attached to colloidal CdSe/ZnS quantum dots in Förster resonant energy transfer assemblies J. Appl. Phys. 117, 024701 (2015); 10.1063/1.4905025 Thermal and structural dependence of the band gap of quantum dots measured by a transparent film heater Efficient energy transfer from hole transporting materials to CdSe-core CdS/ZnCdS/ZnS-multishell quantum dots in type II aligned blend films Appl. Phys. Lett. 99, 093106 (2011); 10.1063/1.3633110 Coexistence of type-I and type-II band lineups in Cd ( Te , Se ) ∕ Zn Se quantum-dot structuresWe report a comparative study of photo-stability of CdSe/ZnS quantum dots (QDs) in a variety of thin film samples. These include electrophoretically deposited single and differently sized segregated bilayer films and self-assembled mixed-sized films. Our studies follow static and dynamic QD photoluminescence over prolonged periods of photo-excitation and find that compared to both single-sized and mixed-sized films, the segregated bilayer samples exhibit highest photo-stability. These films show a QD emission quench rate of $2.5 times slower than the others and have almost negligible spectral shifts (<2 nm). Time-resolved measurements indicate very short inter-layer energy transfer (ET) time for the acceptor QDs in the bilayer, coupled with low ET efficiency for the donor dots. Further analysis reveals a complex interplay of intra-and inter-ensemble ET, with ET rates that have disparate spectral dependence between the mixed and bilayer films, and we conclude that this leads to the enhanced photo stability in the latter. Our findings provide a vital clue to the optimal design of QD based energy-harvesting structures. V C 2013 AIP Publishing LLC. [http://dx.

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Sacrificial layer electrophoretic deposition of free-standing multilayered nanoparticle films

Abstract: Sacrificial layer electrophoretic deposition (SLED) is a technique to assemble nanoparticles that yields free-standing, multilayered nanoparticle films with macroscopic lateral dimensions after the sacrificial layer is dissolved.

Cited by 40 publications

References 33 publications

Free‐Standing Ultrathin Ceramic Foils

Free‐Standing Ultrathin Ceramic Foils

Fabrication, Transfer, and Transport Properties of Monolayered Freestanding Nanoparticle Sheets

Increased photo-stability of quantum dots in segregated bilayer films

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