Synthesis of a Nonagglomerated Indium Tin Oxide Nanoparticle Dispersion

Gilstrap, Richard A.; Capozzi, Charles J.; Carson, Cantwell G.; Gerhardt, Rosario A.; Summers, Christopher J.

doi:10.1002/adma.200702556

Cited by 112 publications

(70 citation statements)

References 21 publications

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“…A sharp peak at 1710 cm À1 , broad bands ranging from 1520 to 1630 cm À1 and from 1720 to 1740 cm À1 are assigned to CdO symmetric stretch from oleic acid, asymmetric COO stretch from metal carboxylates, and ester carbonyl stretch, respectively. 27,28 At 230°C, the peaks for both oleic acid and indium oleate disappear, suggesting that the esterification is complete within five minutes, consistent with the NMR results. Figure 6c shows the time dependence of the esterification and decomposition of indium oleate at 230°C based upon the FT-IR peaks of the acid, metal carboxylate, and ester.…”

Section: Articlesupporting

confidence: 86%

Synthesis of Ligand-Stabilized Metal Oxide Nanocrystals and Epitaxial Core/Shell Nanocrystalsviaa Lower-Temperature Esterification Process

Ito¹,

Yokoyama²,

Zaikova³

et al. 2014

ACS Nano

166

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The properties of metal oxide nanocrystals can be tuned by incorporating mixtures of matrix metal elements, adding metal ion dopants, or constructing core/shell structures. However, high-temperature conditions required to synthesize these nanocrystals make it difficult to achieve the desired compositions, doping levels, and structural control. We present a lower temperature synthesis of ligand-stabilized metal oxide nanocrystals that produces crystalline, monodisperse nanocrystals at temperatures well below the thermal decomposition point of the precursors. Slow injection (0.2 mL/min) of an oleic acid solution of the metal oleate complex into an oleyl alcohol solvent at 230 °C results in a rapid esterification reaction and the production of metal oxide nanocrystals. The approach produces high yields of crystalline, monodisperse metal oxide nanoparticles containing manganese, iron, cobalt, zinc, and indium within 20 min. Synthesis of tin-doped indium oxide (ITO) can be accomplished with good control of the tin doping levels. Finally, the method makes it possible to perform epitaxial growth of shells onto nanocrystal cores to produce core/shell nanocrystals.

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Section: Articlesupporting

confidence: 86%

Synthesis of Ligand-Stabilized Metal Oxide Nanocrystals and Epitaxial Core/Shell Nanocrystalsviaa Lower-Temperature Esterification Process

Ito¹,

Yokoyama²,

Zaikova³

et al. 2014

ACS Nano

166

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“…[49] Thed ensity of these valence band holes can be reversibly controlled by employing areducing or an oxidizing atmosphere,t hereby allowing reversible tuning of the LSPR band. [11,[52][53][54][55] Similar to bulk TCOs in which oxygen vacancies promote ntype doping,t he LSPR from TCO nanocrystals is also dominated by n-type doping.Atypical LSPR band from Sn 4+ -doped In 2 O 3 (ITO) nanocrystals is shown in Figure 6c. [12,51] On the other hand, bulk and thin films of transparent conducting oxides (TCO) exhibit ahigh density of delocalized electrons in the conduction band.…”

Section: Charge Doping By Heterovalent Ions For Plasmonic Propertiesmentioning

confidence: 99%

“…[11] Thec apability to modulate this LSPR band with small variations in the density of delocalized electrons gives rise to applications,s uch as near infrared (NIR)selective smart windows [12] and optical sensing [13] of electrochemical processes.A part from electronic, optical, and optoelectronic properties,e fforts are also being made to achieve useful magnetic properties by doping transition-metal ions with unpaired electrons in various compound semiconductor nanocrystals. Collective oscillation of these doped conduction electrons upon photo absorption yields localized surface plasmon resonance (LSPR) in doped nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Luminescence, Plasmonic, and Magnetic Properties of Doped Semiconductor Nanocrystals

et al. 2017

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Introducing a few atoms of impurities or dopants in semiconductor nanocrystals can drastically alter the existing properties or even introduce new properties. For example, mid-gap states created by doping tremendously affect photocatalytic activities and surface controlled redox reactions, generate new emission centers, show thermometric optical switching, make FRET donors by enhancing the excited state lifetime, and also create localized surface plasmon resonance induced low energy absorption. In addition, researchers have more recently started focusing their attention on doped nanocrystals as an important and alternative material for solar energy conversion to meet the current demand for renewable energy. Moreover, the electrical and magnetic properties of the host are also strongly altered on doping. These beneficial dopant-induced changes suggest that doped nanocrystals with proper selections of dopant-host pairs may be helpful for generating designer materials for a wide range of current technological needs. How properties relate to the doping of a variety of semiconductor nanocrystals are summarized in this Review.

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“…To date, only few publications about the processing of conductive ITO polymer composites exist . Most of the articles report innovations in nano‐particle synthesis or printing of sol–gel precursors …”

Section: Introductionmentioning

confidence: 99%

Tape Casting of ITO Green Tapes for Flexible Electroluminescent Lamps

et al. 2011

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Indium tin oxide (ITO) is a widely applied optoelectronic material. However, conventionally, it is deposited via cost‐ and energy‐intensive physical vapor deposition processes (PVD) like sputtering, resulting in rather brittle layers. In this report, the tape casting process is presented as an alternative processing route for the manufacture of transparent, conductive ITO layers. Tape casting is a particle‐based technique, thus ITO nano‐particles are first dispersed and stabilized in organic solvents. Subsequently, slurries are prepared using polyvinyl butyral binder and benzyl phthalate plasticizer. The rheological behavior of the slurries is analyzed and adapted to the tape casting process. After tape casting, the ITO green tapes are characterized concerning their electrical and optical behavior. Optical transmission up to 75% and electrical resistances down to 2 Ω·cm are reached without any further treatment. The ITO layers which exhibit such values are already suitable for applications in certain electronic devices. In this study, the applicability of the ITO green tapes is demonstrated by the assembly of functional, fully flexible electroluminescent lamps, which are laminated using the ITO green tapes as well as other functional green tapes in the as‐deposited state.

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Synthesis of a Nonagglomerated Indium Tin Oxide Nanoparticle Dispersion

Abstract: Highly crystalline nonagglomerated ITO colloidal nanoparticles form an optically clear solution in nonpolar solvents. Their ∼5 nm diameter and narrow size distribution is achieved through a fatty acid mediated reaction, that lacks the need for high‐temperature annealing.

Cited by 112 publications

References 21 publications

Synthesis of Ligand-Stabilized Metal Oxide Nanocrystals and Epitaxial Core/Shell Nanocrystalsviaa Lower-Temperature Esterification Process

Synthesis of Ligand-Stabilized Metal Oxide Nanocrystals and Epitaxial Core/Shell Nanocrystalsviaa Lower-Temperature Esterification Process

Luminescence, Plasmonic, and Magnetic Properties of Doped Semiconductor Nanocrystals

Tape Casting of ITO Green Tapes for Flexible Electroluminescent Lamps

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