Functionalized ZnO nanoparticles for thin-film transistors: support of ligand removal by non-thermal methods

Weber, Dieter; Botnaraş, Silviu; Pham, Duy Vu; Steiger, J.; Cola, Luisa De

doi:10.1039/c3tc00576c

Cited by 24 publications

(29 citation statements)

References 26 publications

(30 reference statements)

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“…However, a ligand removal treatment like the one demonstrated herein, that degrades the ligand shell prior to thermal treatment, can reduce the temperature required for core fusion enough to be compatible with these sensitive substrates. 50,51 METHODS Gold Nanoparticle Synthesis. The nanomaterials used for experiments were all 1.4 nm gold nanoparticles (AuNPs).…”

Section: Resultsmentioning

confidence: 99%

Removal of Thiol Ligands from Surface-Confined Nanoparticles without Particle Growth or Desorption

2015

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Size-dependent properties of surface-confined inorganic nanostructures are of interest for applications ranging from sensing to catalysis and energy production. Ligand-stabilized nanoparticles are attractive precursors for producing such nanostructures because the stabilizing ligands may be used to direct assembly of thoroughly characterized nanoparticles on the surface. Upon assembly; however, the ligands block the active surface of the nanoparticle. Methods used to remove these ligands typically result in release of nanoparticles from the surface or cause undesired growth of the nanoparticle core. Here, we demonstrate that mild chemical oxidation (50 ppm of ozone in nitrogen) oxidizes the thiolate headgroups, lowering the ligand's affinity for the gold nanoparticle surface and permitting the removal of the ligands at room temperature by rinsing with water. XPS and TEM measurements, performed using a custom planar analysis platform that permits detailed imaging and chemical analysis, provide insight into the mechanism of ligand removal and show that the particles retain their core size and remain tethered on the surface core during treatment. By varying the ozone exposure time, it is possible to control the amount of ligand removed. Catalytic carbon monoxide oxidation was used as a functional assay to demonstrate ligand removal from the gold surface for nanoparticles assembled on a high surface area support (fumed silica).

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Section: Resultsmentioning

confidence: 99%

Removal of Thiol Ligands from Surface-Confined Nanoparticles without Particle Growth or Desorption

2015

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“…Alternative, the high temperature annealing can be substituted by additional low temperature treatments such as UV irradiation, vacuum annealing, or plasma treatments, which anyway complicate the fabrication process. 195,242,243 Additionally, an active channel layer constituted by nanoparticles inherently features a high number of (grain) boundaries, each one acting as a potential barrier against charge transport. Furthermore, high film porosity and roughness at the interface semiconductor/gate dielectrics have been demonstrated to be detrimental for the TFT performance.…”

Section: Fabrication Techniquesmentioning

confidence: 99%

Metal oxide semiconductor thin-film transistors for flexible electronics

Petti

Münzenrieder

Vogt

et al. 2016

Applied Physics Reviews

547

430

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“…Additional solvents: acetonitrile, ethyl acetate, anisole, dimethylformamide (DMF), dichloromethane, methanol, hexane, acetone, and water were of 99% purity or greater and obtained from VWR (Radnor, PA, USA), Fisher Scientific (Fair Lawn, NJ, USA), or Sigma-Aldrich (St. Louis, MO, USA). ZnO-OA nanoparticles were synthesized as reported by Epifani et al and Weber et al [12,13]. ZnO-PSAN nanoparticles were synthesized from ZnO-OA using a ligand exchange protocol described previously [14].…”

Section: Materials and Synthesismentioning

confidence: 99%

Characterization of ZnO Nanoparticles using Superconducting Tunnel Junction Cryodetection Mass Spectrometry

Plath

Wang

Yan

et al. 2017

J. Am. Soc. Mass Spectrom.

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Zinc oxide (ZnO) nanoparticles coated with either n-octylamine (OA) or α-amino poly(styrene-co-acrylonitrile) (PSAN) ligands (L) have been analyzed using laser desorption/ionization and matrix assisted laser desorption/ionization (MALDI) time-of-flight (TOF) superconducting tunnel junction (STJ) cryodetection mass spectrometry. STJ cryodetection has the advantage of high m/z detection and allows for the determination of average molecular weights and dispersities for 500-600 kDa ZnO-L nanoparticles. The ability to detect the relative energies deposited into the STJs has allowed for investigation of ZnO-L metastable fragmentation. ZnO-L precursor ions gain enough internal energy during the MALDI process to undergo metastable fragmentation in the flight tube. These fragments produced a lower energy peak, which was assigned as ligand-stripped ZnO cores whereas the individual ligands were at too low of an energy to be observed. From these STJ energy resolved peaks, the average weight percentage of inorganic material making up the nanoparticle was determined, where ZnO-OA and ZnO-PSAN nanoparticles are comprised of ~62% and ~68% wt ZnO, respectively. In one example, grafting densities were calculated based on the metastable fragmentation of ligands from the core to be 16 and 1.1 nm for ZnO-OA and ZnO-PSAN, respectively, and compared with values determined by thermogravimetric analysis (TGA) and transmission electron microscopy (TEM). Graphical Abstract ᅟ.

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Functionalized ZnO nanoparticles for thin-film transistors: support of ligand removal by non-thermal methods

Cited by 24 publications

References 26 publications

Removal of Thiol Ligands from Surface-Confined Nanoparticles without Particle Growth or Desorption

Removal of Thiol Ligands from Surface-Confined Nanoparticles without Particle Growth or Desorption

Metal oxide semiconductor thin-film transistors for flexible electronics

Characterization of ZnO Nanoparticles using Superconducting Tunnel Junction Cryodetection Mass Spectrometry

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