Electrically bistable Ag nanocrystal-embedded metal–organic framework microneedles

Park, Keum Hwan; Kim, Mun Ho; Im, Sang Hyuk; Park, O Ok

doi:10.1039/c6ra13014c

Cited by 14 publications

(14 citation statements)

References 22 publications

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“…Most of all, the resistive random access memory (ReRAM) has been considered as promising next-generation nonvolatile memory device due to its simple device architecture, high memory density, fast operation speed, and low power consumption. The ReRAM can handle the information by resistive switching (RS) effect originated from the conductive filament formation 1 , the crystalline-amorphous phase transition 2 , 3 , and the charge storaging/trapping 4 , 5 .…”

Section: Introductionmentioning

confidence: 99%

Memory effect behavior with respect to the crystal grain size in the organic-inorganic hybrid perovskite nonvolatile resistive random access memory

Heo

Shin

Moon

et al. 2017

Sci Rep

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The crystal grain size of CH3NH3PbI3 (MAPbI3) organic-inorganic hybrid perovskite (OHP) film was controllable in the range from ~60 nm to ~600 nm by non-solvents inter-diffusion controlled crystallization process in dripping crystallization method for the formation of perovskite film. The MAPbI3 OHP non-volatile resistive random access memory with ~60 nm crystal grain size exhibited >0.1 TB/in2 storage capacity, >600 cycles endurance, >104 s data retention time, ~0.7 V set, and ~−0.61 V re-set bias voltage.

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Section: Introductionmentioning

confidence: 99%

Memory effect behavior with respect to the crystal grain size in the organic-inorganic hybrid perovskite nonvolatile resistive random access memory

Heo

Shin

Moon

et al. 2017

Sci Rep

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“…38 It has also been reported that N−Ag−N coordination bonds are relatively weak and hence that complexes based on such bonds are not stable. 34,35 Therefore, as the Ag nanocrystals form, they catalyze the reduction of Ag + ions, thus promoting the breaking of the N−Ag−N bonds in the complexes. As a result, the needle-shaped particles disappear.…”

Section: Resultsmentioning

confidence: 99%

Zigzag-Shaped Silver Nanoplates: Synthesis via Ostwald Ripening and Their Application in Highly Sensitive Strain Sensors

Kim

Lee

Kim

et al. 2018

ACS Appl. Mater. Interfaces

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Zigzag-shaped Ag nanoplates display unique anisotropic planar structures with unusual jagged edges and relatively large lateral dimensions. These characteristics make such nanoplates promising candidates for metal inks in printed electronics, which can be used for realizing stretchable electrodes. In the current work, we used a one-pot coordination-based synthetic strategy to synthesize zigzag-shaped Ag nanoplates. In the synthetic procedure, cyanuric acid was used both as a ligand of the Ag + ion, hence producing complex structures and controlling the kinetics of the reduction of the cation, and as a capping agent that promoted the lateral growth of the Ag nanoplates. Hence, cyanuric acid played a crucial role in the formation of zigzag-shaped nanoplates. In contrast to previous studies that reported oriented attachment to be the predominant mechanism responsible for the growth of zigzag-shaped nanoplates, Ostwald ripening was the dominant growth mechanism in the current work. Our findings on the particle morphology and crystalline structure of the Ag nanoplates motivated us to use them as conductive materials for stretchable strain sensors. Strain sensors based on nanocomposites of our zigzag-shaped Ag nanoplate and polydimethylsiloxane in the form of a sandwich structure were successfully produced by following a simple, low-cost, and solution-processable method. The strain sensors exhibited extremely high sensitivity (gauge factor ≈ 2000), high stretchability with a linear response (≈27%), and high reliability, all of which allowed the sensor to monitor diverse human motions, including joint movement and phonation.

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“…Besides, they are easy to use, even by the patient itself, and have an improved drug permeability compared to other transdermal drug delivery devices (e.g., transdermal patches, topical creams, emulsions and ointments) [ 8 ]. Different materials or combinations can be used to produce microneedles (e.g., metal, biopolymers, metal-organic frameworks, polymer-ceramic) for transdermal drug delivery [ 9 , 10 , 11 , 12 ]. Besides the type of material used for fabrication, the microneedles need to perforate the skin, and this is highly affected by the geometry of microneedles, including height, width, shape, and mechanical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Antibiofilm Efficacy of the Pseudomonas aeruginosa Pbunavirus vB_PaeM-SMS29 Loaded onto Dissolving Polyvinyl Alcohol Microneedles

Sillankorva

Pires

Pastrana

et al. 2022

Viruses

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Resistant bacteria prevail in most chronic skin wounds and other biofilm-related topical skin infections. Bacteriophages (phages) have proven their antimicrobial effectiveness for treating different antibiotic-resistant and multidrug-resistant bacterial infections, but not all phages are effective against biofilms. Phages possessing depolymerases can reach different biofilm layers; however, those that do not have depolymerase activity struggle to penetrate and navigate in the intricate 3D biofilm structure and mainly infect bacteria lodged in the outer biofilm layers. To address this, Pseudomonas aeruginosa phage vB_PaeM-SMS29, a phage with poor antibiofilm properties, was incorporated into polyvinyl alcohol (PVA, Mowiol 4:88) supplemented with 0.1% (v/v) of glycerol, and cast onto two different microneedle arrays varying in geometry. The dissolving microneedles were thoroughly characterized by microscopy, force-displacement, swelling, phage release and stability. Furthermore, 48 h-old biofilms were formed using the colony biofilm procedure (absence of broth), and the antibiofilm efficacy of the phage-loaded microneedles was evaluated by viable cell counts and microscopy and compared to free phages. The phages in microneedles were fairly stable for six months when stored at 4 °C, with minor decreases in phage titers observed. The geometry of the microneedles influenced the penetration and force-displacement characteristics but not the antimicrobial efficacy against biofilms. The two PVA microneedles loaded with phages reduced P. aeruginosa PAO1 biofilms by 2.44 to 2.76 log10 CFU·cm−2 at 24 h. These values are significantly higher than the result obtained after the treatment with the free phage (1.09 log10 CFU·cm−2). Overall, this study shows that the distribution of phages caused by the mechanical disruption of biofilms using dissolving microneedles can be an effective delivery method against topical biofilm-related skin infections.

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Electrically bistable Ag nanocrystal-embedded metal–organic framework microneedles

Abstract: Electrically bistable Ag nanocrystal-embedded metal–organic frameworks (MOF) were synthesized using a one-pot synthetic method by introducing melamine into a polyol process for the synthesis of Ag nanocrystals.

Cited by 14 publications

References 22 publications

Memory effect behavior with respect to the crystal grain size in the organic-inorganic hybrid perovskite nonvolatile resistive random access memory

Memory effect behavior with respect to the crystal grain size in the organic-inorganic hybrid perovskite nonvolatile resistive random access memory

Zigzag-Shaped Silver Nanoplates: Synthesis via Ostwald Ripening and Their Application in Highly Sensitive Strain Sensors

Antibiofilm Efficacy of the Pseudomonas aeruginosa Pbunavirus vB_PaeM-SMS29 Loaded onto Dissolving Polyvinyl Alcohol Microneedles

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