Self-assemblies of luminescent rare earth compounds in capsules and multilayers

Zhang, Renjie; Shang, Juanjuan; Jing, Xin; Xie, Beibei; Li, Ya; Möhwald, Helmuth

doi:10.1016/j.cis.2013.12.012

Cited by 17 publications

(17 citation statements)

References 130 publications

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“…Hollow nanoballoons with ultrathin shells tend to flatten after air-drying, similar to extensively observed hollow microcapsules. [23][24] The air-dried UMHNBs collapse, as observed by TEM ( Figure 1d) and SEM (Figure 1e), with an average shell thickness of 3.7 nm as analyzed by AFM (Figure 1f). Two reasons that UMHNBs flatten to nanosheets are: 1.)…”

mentioning

confidence: 96%

Inflating Strategy To Form Ultrathin Hollow MnO₂ Nanoballoons

Shang¹,

Xie²,

Li³

et al. 2016

ACS Nano

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Ultrathin MnO2 hollow nanoballoons (UMHNBs) have a large ratio of interfacial to total atoms, corresponding to expected improved performance. However, their synthesis is a challenge due to difficulty in controlling the concentration of the unit cells. Herein, we describe a strategy to synthesize dry intact UMHNBs through a one-step synthesis by inflating MnO2 (reduced from KMnO4) with CO2 (oxidized from single-layer graphene oxide nanosheets) followed by instant freeze-drying. UMHNBs are 30-500 nm in diameter with a shell thickness of 3.7 nm, packing with laminar [MnO6] unit cells in the form of δ-MnO2. UMHNBs show efficient catalytic activity for decomposing the organic dye methylene blue (MB), 15 times the biggest reported value, and have long-term catalytic efficacy and durability. The described strategy in this paper makes use of graphene nanosheets to assemble durable ultrathin hollow nanoballoons.

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confidence: 96%

Inflating Strategy To Form Ultrathin Hollow MnO₂ Nanoballoons

Shang¹,

Xie²,

Li³

et al. 2016

ACS Nano

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“…Beyond 2D planar surfaces, hybrid LbL multilayer assemblies incorporating POMs and polymers have also been constructed on the shell of 3D spherical capsules, obtained after the removal of the particle core by suitable solvents. For instance, Xu and co‐workers and Cui et al constructed hybrid multilayer films comprising different types of POMs and PAH on the surface of manganese carbonate (MnCO 3 ), PS, or poly(styrene‐acrylic acid) (PSA) core particles (see Figure ).…”

Section: Light‐responsive Lbl Polymeric Multilayer Assembliesmentioning

confidence: 99%

Layer‐by‐Layer Assembly of Light‐Responsive Polymeric Multilayer Systems

Borges

Rodrigues

Reis

et al. 2014

Adv Funct Materials

115

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wileyonlinelibrary.comcompositions, structures, and functions for several relevant applications. This goal has been achieved by engineering several nanostructured building blocks on surfaces through many processing methods. 'Bottom-up' methods, including Langmuir-Blodgett (LB), [1][2][3] self-assembled monolayers (SAMs), [4][5][6][7][8][9][10][11][12][13] and Layerby-Layer (LbL) assembly, [14][15][16][17][18][19] have been widely used to modify and effectively tailor the surface properties and simultaneously for assembling desired molecules with a high degree of control over organization and orientation. Therefore, these surface engineering strategies have been used to design and fabricate organized monolayer fi lms (in the case of SAM methodology) and multilayer assemblies (in the case of LB and LbL assembly approaches) with precisely layered structures, compositions, properties, and functions, and thus with enhanced performance at the molecular level. Furthermore, the bulk properties of nanostructured materials and the ability to precisely tailor the surface properties and fi nely tune the physicochemical properties and structures of engineered functional molecular assemblies have been recognized as having paramount importance for the scientifi c and engineering communities due to the broad range of possible applications in the biomedical, electronics, optics, catalysis, and energy research fi elds. [20][21][22] It is well known and commonly agreed that nature provides a great source of endless inspirations for designing highly sophisticated functional materials. Hence, scientists and engineers from different areas of chemistry, physics, engineering, biology, medicine, or biotechnology have been challenged to design and engineer environmentally sensitive biomimetic surfaces that would respond to specifi c external stimuli (e.g. temperature, pH, ionic strength, light, mechanical stress, electric, magnetic and ultrasonic fi elds, electric potential, specifi c biological moieties) in a very controllable and predictable manner, hence adjusting to our demands. Such smart surfaces have been developed by modifying surfaces with stimuliresponsive polymeric materials that ideally exhibit reversible switchable physicochemical properties (i.e., a polymer should be switched repeatedly rather than being designed for a single event), precisely tailored structures, compositions, and functions in response to changes in the surrounding environment. Layer-by-Layer (LbL) assembly is a simple and highly versatile method to modify surfaces and fabricate robust and highly-ordered nanostructured coatings over almost any type of substrate. Such versatility enables the incorporation of a plethora of building blocks, including materials exhibiting switchable properties, in a single device through a multitude of complementary intermolecular interactions. Switchable materials may undergo reversible physicochemical changes in response toa variety of external triggers. Although most of the works in the literature have been focusing on stimu...

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“…In light industry the need of narrow emissions with high color rendering and good luminescence efficiency are the main objectives to achieve [6].…”

Section: Introductionmentioning

confidence: 99%