Optical properties of γ-AgI nanocrystals synthesized in reverse micelles

Vogelsang, H.; Husberg, O.; Osten, W. von der

doi:10.1016/s0022-2313(99)00603-1

Cited by 25 publications

(16 citation statements)

References 18 publications

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“…This latter growth mode involves negligible interparticle diffusion as observed in the recent electrochemical synthesis of meso-scale metal nanoparticles. 30 Thus, the strain-induced size control by Cu helps in the confinement of excitons in AgI nanoparticles and the inhomogenity of the PL peak observed even at RT represents the particle size distribution 31,32 as reflected by its fwhm (full width at halfmaximum).…”

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confidence: 99%

Strain-Induced Confinement of Excitons in Quasi-free AgI Nanoparticles

and

Sunandana

2002

Nano Lett.

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The optical spectra of vapor quenched metastable Ag−Cu thin films progressively iodized under ambient conditions have been measured. Delayed evolution and inhomogeneous broadening of the exciton absorption at 420 nm of the spatially confined γ-AgI nanoparticles were clearly seen by the development of Z 1,2 exciton peak − iodization being controlled by the as-quenched Ag−Cu clusters. Cu addition not only restricts the particle size, but also favors the island type growth mode.

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confidence: 99%

Strain-Induced Confinement of Excitons in Quasi-free AgI Nanoparticles

and

Sunandana

2002

Nano Lett.

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“…A sharp peak y421 nm and a shoulder peak y330 nm were observed, which were attributed to exciton peaks of AgI. [11][12][13][14] Thus, the existence of AgI nanoparticles was confirmed from the UV-VIS spectroscopy. Accordingly, the XRD measurement revealed that the obtained AgI nanoparticles were b-AgI or a mixture of b-AgI and c-AgI.…”

Section: Resultsmentioning

confidence: 77%

Preparation of amine free silica-coated Agl nanoparticles with modified Stöber method

Kobayashi

Shimizu

Misawa

et al. 2008

Surface Engineering

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In recent years, the authors studied on fabrication of silica-coated AgI (AgI-SiO 2 ) nanoparticles with a Stö ber method toward new X-ray contrast agents. In the Stö ber method, amines are often used as catalysts for silica formation, so that it is probable that amine is left in the silica-coated particles. Since amines are harmful to the human body, amine free particles are desired for medical use. From this viewpoint, amine free AgI-SiO 2 nanoparticles were prepared with a modified Stö ber method using NaOH as a catalyst instead of amine in the present work. The AgI nanoparticles were prepared from AgClO 4 and KI with the use of 3-mercaptopropyltrimethoxysilane (MPS) as a silane coupling agent and NaOH catalyst for alkoxide hydrolysis. The silicacoating was performed at 4?5610 25 M MPS, 15-22?5M water, 0?0008-0?0024M NaOH and 0?0004-0?009M tetraethylorthosilicate at an AgI concentration of 0?001M. AgI-SiO 2 particles as small as ca. 30 nm could be successfully fabricated at the concentrations of 4?5610 25 M MPS, 20M water, 0?0011M NaOH, 0?001M AgI and 0?004M tetraethylorthosilicate.

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“…S4(a) † indicates that the broadening of the peak is due to overlapping of three emission peaks at 463, 502, and 575 nm; these three emissions were attributed to distant pair donor-acceptor (D-A) recombination mediated by the high density of deep trap states involving exciton-phonon interactions or crystalline defects or impurities. 27,28 Although the emission spectra of the AgI-RGA nanocomposites appear to be similar to those of AgI nanostructures, strong, preferential luminescence quenching was evident with increasing GO content. This is in accordance with the fact that graphene nanosheets have a higher tendency to accept electrons and the excited AgI nanostructures are good electron donors.…”

Section: Resultsmentioning

confidence: 98%

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

et al. 2015

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AgI nanoparticle-functionalized self-assembled reduced graphene oxide aerogels are constructed using vitamin C as the reducing agent. The obtained aerogels can be used as efficient catalysts for organic dye degradation, reduction of 4nitrophenol, and synthesis of bis(indolyl)methane. A set of characterizations, including FESEM, TEM, XRD, XPS, Raman, FTIR, optical absorption, and photoluminescence techniques, confirm that the aerogel is formed from ultra-dispersed AgI nanocrystals and the self-assembly of reduced graphene oxide nanosheets into porous hydrogel structures. The obtained aerogels exhibit high photocatalytic degradation ability toward an organic dye (Rhodamine-B) because of the high visible light-driven catalytic activity of AgI and the high specific surface area of graphene nanosheets with three-dimensional interconnected pores. The well-wrapped reduced graphene oxide nanosheets on AgI nanostructures could promote the transfer of photo-generated electrons, which not only effectively inhibits the recombination of electrons and holes but also suppresses the photocorrosion of AgI; this promotes the photocatalytic activity and stability. Moreover, these nanostructures show the best catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4 as a reducing agent. Furthermore, the AgI-reduced graphene oxide aerogel nanocomposites are active catalysts for the synthesis of bis(indolyl)methane under solvent-free conditions. The nanocomposites exhibit excellent catalytic activity and remarkable durability. This study brings a novel approach to the development of multi-responsive reduced graphene oxide aerogels via the co-assembly of various semiconductor nanocomponents for a variety of applications that involve sustained catalytic activity. Electronic Supplementary Information (ESI) available: Experimental and characterizations, Schematic mechanism of the formation of the AgI-graphene hydrogel, EDS and EDS mapping, PL and CIE analysis, BET analysis, UV-visible spectra of the photocatalytic activity, 1 H NMR of RhB with photodegradation time, photocurrent responses and EIS analysis, FESEM, XPS and XRD patterns of the recycled catalysts, 1 H and 13 C NMR spectra of bis(indolyl)methane. See Facile Recycling by D. A. Reddy et al.→ This work demonstrates the facile green synthesis of AgI-reduced graphene oxide aerogels with superior photocatalytic performance and remarkable durability.

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Optical properties of γ-AgI nanocrystals synthesized in reverse micelles

Cited by 25 publications

References 18 publications

Strain-Induced Confinement of Excitons in Quasi-free AgI Nanoparticles

Strain-Induced Confinement of Excitons in Quasi-free AgI Nanoparticles

Preparation of amine free silica-coated Agl nanoparticles with modified Stöber method

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

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