Green Processing of Metal Oxide Core–Shell Nanoparticles as Low‐Temperature Dielectrics in Organic Thin‐Film Transistors

Portilla, Luis; Etschel, Sebastian H.; Tykwinski, Rik R.; Halik, Marcus

doi:10.1002/adma.201502792

Cited by 17 publications

(11 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the remarkable stability and surface positive charge provided by the PA‐SAM molecules in aqueous conditions can be applied to other metal oxide nanoparticle cores . Therefore, surface modification with these PA‐SAMs establishes a universal approach for the stabilization of metal oxide nanoparticles which can be of value in other fields of nanotechnology .…”

Section: Introductionmentioning

confidence: 99%

Enhanced In Vitro Biocompatibility and Water Dispersibility of Magnetite and Cobalt Ferrite Nanoparticles Employed as ROS Formation Enhancer in Radiation Cancer Therapy

Klein

Kızaloğlu

Portilla

et al. 2018

Small

Self Cite

View full text Add to dashboard Cite

Efficient magnetic reactive oxygen species (ROS) formation enhancing agents after X-ray treatment are realized by functionalizing superparamagnetic magnetite (Fe O ) and Co-ferrite (CoFe O ) nanoparticles with self-assembled monolayers (SAMs). The Fe O and CoFe O nanoparticles are synthesized using Massart's coprecipitation technique. Successful surface modification with the SAM forming compounds 1-methyl-3-(dodecylphosphonic acid) imidazolium bromide, or (2-{2-[2-hydroxy-ethoxy]-ethoxy}-ethyl phosphonic acid provides biocompatibility and long-term stability of the Fe O and CoFe O nanoparticles in cell media. The SAM-stabilized ferrite nanoparticles are characterized with dynamic light scattering, X-ray powder diffraction, a superconducting quantum interference device, Fourier transform infrared attenuated total reflectance spectroscopy, zeta potential measurements, and thermogravimetric analysis. The impact of the SAM-stabilized nanoparticles on the viability of the MCF-7 cells and healthy human umbilical vein endothelial cells (HUVECs) is assessed using the neutral red assay. Under X-ray exposure with a single dosage of 1 Gy the intracellular SAM stabilized Fe O and CoFe O nanoparticles are observed to increase the level of ROS in MCF-7 breast cancer cells but not in healthy HUVECs. The drastic ROS enhancement is associated with very low dose modifying factors for a survival fraction of 50%. This significant ROS enhancement effect by SAM-stabilized Fe O and CoFe O nanoparticles constitutes their excellent applicability in radiation therapy.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced In Vitro Biocompatibility and Water Dispersibility of Magnetite and Cobalt Ferrite Nanoparticles Employed as ROS Formation Enhancer in Radiation Cancer Therapy

Klein

Kızaloğlu

Portilla

et al. 2018

Small

Self Cite

View full text Add to dashboard Cite

show abstract

“…As semiconducting material the asymmetric 2-tridecyl [1]benzothieno [3,2-b][1]benzothiophene (C 13 -BTBT) was utilized, a small molecule which showed excellent mobilities in previous experiments. [ 16,17 ] Figure 3 b shows the changes in capacitance as direct effect of the doping of the SAM. In Table 2 the corresponding capacitance data of the layers at 1 V at 500 kHz can be seen.…”

Section: Doi: 101002/adma201503911mentioning

confidence: 98%

Improving the Performance of Organic Thin‐Film Transistors by Ion Doping of Ethylene‐Glycol‐Based Self‐Assembled Monolayer Hybrid Dielectrics

Dietrich

Scheiner²,

Portilla³

et al. 2015

Advanced Materials

Self Cite

View full text Add to dashboard Cite

Tuning the electrostatics of ethylene-glycol-based self-assembled monolayers (SAMs) by doping with ions is shown. Molecular dynamics simulations unravel binding mechanisms and predict dipole strengths of the doped layers. Additionally, by applying such layers as dielectrics in organic thin-film transistors, the incorporated ions are proven to enhance device performance by lowering the threshold voltage and increasing conductivity.

show abstract

“…Polymer dielectrics usually afford excellent mechanical flexibility and are compatible with inexpensive plastic foils since they can be processed by coating or printing techniques at low temperatures, but polymers generally have low k, which makes it difficult to meet the requirements for high-density charge storage [7][8][9]. Therefore, the growing appeal in new dielectric materials has arisen primarily from the necessity for an inexpensive device fabrication process and the reduction of the operating voltages required for new flexible/printed electronic technologies [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Low-Power Flexible Organic Field-Effect Transistors with Solution-Processable Polymer-Ceramic Nanoparticle Composite Dielectrics

et al. 2020

View full text Add to dashboard Cite

Polymer-ceramic dielectric composites have been of great interest because they combine the processability of polymers with the desired dielectric properties of the ceramics. We fabricated a low voltage-operated flexible organic field-effect transistor (OFET) based on crosslinked poly (4-vinyl phenol) (PVP) polymer blended with novel ceramic calcium titanate nanoparticles (CaTiO3 NPs) as gate dielectric. To reduce interface roughness caused by nanoparticles, it was further coated with a very thin PVP film. The resulting OFET exhibited much lower operated voltage (reducing from –10.5 V to –2.9 V), a relatively steeper threshold slope (~0.8 V/dec) than those containing a pure PVP dielectric. This is ascribed to the high capacitance of the CaTiO3 NP-filled PVP insulator, and its smoother and hydrophobic dielectric surface proved by atomic force microscopy (AFM) and a water contact angle test. We also evaluated the transistor properties in a compressed state. The corresponding device had no significant degradation in performance when bending at various diameters. In particular, it operated well continuously for 120 hours during a constant bending stress. We believe that this technology will be instrumental in the development of future flexible and printed electronic applications.

show abstract

Green Processing of Metal Oxide Core–Shell Nanoparticles as Low‐Temperature Dielectrics in Organic Thin‐Film Transistors

Cited by 17 publications

References 29 publications

Enhanced In Vitro Biocompatibility and Water Dispersibility of Magnetite and Cobalt Ferrite Nanoparticles Employed as ROS Formation Enhancer in Radiation Cancer Therapy

Enhanced In Vitro Biocompatibility and Water Dispersibility of Magnetite and Cobalt Ferrite Nanoparticles Employed as ROS Formation Enhancer in Radiation Cancer Therapy

Improving the Performance of Organic Thin‐Film Transistors by Ion Doping of Ethylene‐Glycol‐Based Self‐Assembled Monolayer Hybrid Dielectrics

Low-Power Flexible Organic Field-Effect Transistors with Solution-Processable Polymer-Ceramic Nanoparticle Composite Dielectrics

Contact Info

Product

Resources

About