Preparation and Optical Properties of Colloidal, Monodisperse, and Highly Crystalline ITO Nanoparticles

Choi, Sang‐Il; Nam, Ki Min; Park, Bo Keun; Seo, Won Seok; Park, Joon T.

doi:10.1021/cm703706m

Cited by 104 publications

(85 citation statements)

References 17 publications

(16 reference statements)

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“…ITO NCs with an average radius R ITO of 2.83 ± 0.36 nm (SI, Fig. S1 illustrates sizing analysis based on scanning transmission electron microscopy (STEM)) were synthesized following a procedure adapted from the literature (51,52) (see Materials and Methods). Charge-stabilized ITO NCs are obtained by chemically removing the native oleate/oleylamine ligands on the NC surface in the presence of nitrosonium tetrafluoroborate (53) (see Materials and Methods).…”

Section: Resultsmentioning

confidence: 99%

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Cabezas

Ong

Jadrich

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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Gelation of colloidal nanocrystals emerged as a strategy to preserve inherent nanoscale properties in multiscale architectures. However, available gelation methods to directly form self-supported nanocrystal networks struggle to reliably control nanoscale optical phenomena such as photoluminescence and localized surface plasmon resonance (LSPR) across nanocrystal systems due to processing variabilities. Here, we report on an alternative gelation method based on physical internanocrystal interactions: short-range depletion attractions balanced by long-range electrostatic repulsions. The latter are established by removing the native organic ligands that passivate tin-doped indium oxide (ITO) nanocrystals while the former are introduced by mixing with small PEG chains. As we incorporate increasing concentrations of PEG, we observe a reentrant phase behavior featuring two favorable gelation windows; the first arises from bridging effects while the second is attributed to depletion attractions according to phase behavior predicted by our unified theoretical model. Our assembled nanocrystals remain discrete within the gel network, based on X-ray scattering and high-resolution transmission electron microscopy. The infrared optical response of the gels is reflective of both the nanocrystal building blocks and the network architecture, being characteristic of ITO nanocrystals' LSPR with coupling interactions between neighboring nanocrystals.

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Section: Resultsmentioning

confidence: 99%

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Cabezas

Ong

Jadrich

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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“…In literature there are also reports on the synthesis of heavily--doped metal oxide nanocrystals, such as indium tin oxide, aluminium zinc oxide and tungsten oxide. In 2008, Gilstrap et al [53] obtained non--agglomerated indium tin oxide nanocrystals with an average diameter of 5 nm (Figure 6), while Choi et al [54] synthesised monodisperse indium tin oxide nanoparticles with a size ranging from 3 and 9 nm. In 2011, Garcia et It can form in many , CuSe, Cu 2 Se 3 ) and phases.…”

Section: Chemical Synthesis and Structural Properties Of Heavily--dopmentioning

confidence: 99%

Plasmonics in heavily-doped semiconductor nanocrystals

et al. 2013

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Abstract:Heavily--doped semiconductor nanocrystals characterized by a tunable plasmonic band have been gaining increasing attention recently. Herein, we introduce this type of materials focusing on their structural and photo--physical properties. Beside their continuous--wave plasmonic response, depicted both theoretically and experimentally, we also review recent results on their transient ultrafast response. This was successfully interpreted by adapting models of the ultrafast response of noble metal nanoparticles. IntroductionThe optical features exhibited by metallic nano--systems have been the subject of an intensive theoretical and experimental research, resulting in applications in several fields, from surface--enhanced spectroscopy, to biological and chemical nano--sensing [1]. Such developments are primarily due to the localized surface plasmon resonance (LSPR), which results in intense optical absorption and scattering as well as sub--wavelength localization of large electrical fields in the vicinity of the nano--object [2--10]. The plasmonic response of these metallic nanostructures is strongly dependent on the type of metal of which they are made, on the dielectric function of the surrounding medium, on the particle shape and, even if to a lesser extent, on the particle size. Nanoparticles of several metals, such as Ag, Au, Cu and Pt, exhibiting plasmonic response in the ultraviolet and in the visible regions of the spectrum have been successfully synthesized in the past decades [11--15]. Elongated metallic nanoparticles have been shown to exhibit plasmonic response in the near infrared, due to excitation of the longitudinal plasmon mode [16--18]. It has been recently reported that direct optical excitation of the metal by intense femtosecond laser pulses induces an ultra--fast modulation of the plasmonic resonance, which can be used for ultra--fast modulation of signals [19], paving the way to ultrafast active plasmonics. A quantitative investigation of such dynamical features is therefore crucial for the development of a new generation of ultra--fast nano--devices. Pump--probe spectroscopy, giving access to the electronic excitation and subsequent relaxation processes in the material, is to date the most suitable tool for the experimental study of the ultrafast dynamical features exhibited by plasmonic nanostructures. So far, several noble metal structures have been investigated, including spherical nanoparticles [20--22] and nanorods [23], revealing that the physical processes of excitation and relaxation are actually similar to those observed in bulk (i.e. in thin films) metallic systems, that are the electron--electron, the electron--phonon and the phonon--phonon interactions [24,25].

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“…Monodispersed and controlled shape oxide compounds are very important in the development of the on-going various optical, magnetic, and electronic materials [1][2][3]. Additionally the controlled synthesis of well-defined crystals with uniform size and morphology is of great importance and interest for their theoretical study and potential practical applications.…”

Section: Introductionmentioning

confidence: 99%

Spherical shape with fast decaying property of solvothermally grown (Y,Gd)BO3:Eu3+ nanophosphor

Choi¹,

Park²,

Jung³

2011

Journal of Luminescence

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Preparation and Optical Properties of Colloidal, Monodisperse, and Highly Crystalline ITO Nanoparticles

Cited by 104 publications

References 17 publications

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Gelation of plasmonic metal oxide nanocrystals by polymer-induced depletion attractions

Plasmonics in heavily-doped semiconductor nanocrystals

Spherical shape with fast decaying property of solvothermally grown (Y,Gd)BO3:Eu3+ nanophosphor

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