Facile Synthesis of Silver Chalcogenide (Ag<sub>2</sub>E; E = Se, S, Te) Semiconductor Nanocrystals

Sahu, Ayaskanta; Qi, Lejun; Kang, Moon Sung; Deng, Dayi; Norris, David J.

doi:10.1021/ja200012e

Cited by 200 publications

(175 citation statements)

References 31 publications

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“…S1, ESI †) due to the reduced effects of the larger, whereas surface defects derived from the cation exchange were introduced to the smaller QDs, inducing a lower luminescence efficiency (QY) and even PL quenching, which is consistent with recent reports referring to CdTe and Ag 2 Te QDs. 21 For these QDs from the cation exchange, the highest QY (2.3%) was obtained for Ag 2 S QDs (D 2 ) prepared from CdS QDs (D 1 ). Previous studies have reported the relatively low QYs of Ag 2 S QDs, which may be from the inherent properties of Ag-based semiconductor NCs (QDs).…”

Section: Preparation and Characterization Of Cds And Ag 2 S Qdsmentioning

confidence: 95%

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Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag₂S quantum dots emitting in the second near-infrared biological window

Gui

Sun

Liu³

et al. 2014

Dalton Trans.

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Second near-infrared (NIR-II) emitting Ag2S quantum dots (QDs) with high stability and biocompatibility were synthesized and developed toward an ideal nanoprobe. This study reports a facile synthesis of NIR-II Ag2S QDs on the basis of cation exchange between visible-emitting CdS QDs and Ag(+) ions in aqueous solution. Experimental data testified that the cation exchange was quick and complete and that the resultant products were single monoclinic Ag2S without CdS QDs. The prepared Ag2S QDs were systematically characterized, showed typical NIR-II emission and high PL stability, and had small diameters (~3.5 nm) and a quantum yield up to 2.3%. The results of cytotoxicity assay suggested that the Ag2S QDs produced negligible effects in altering the cell proliferation or in generating reactive oxygen species, indicating an ultralow cytotoxicity and an excellent biocompatibility. These properties have opened up the possibility of using Ag2S QDs for effective bioimaging applications.

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Section: Preparation and Characterization Of Cds And Ag 2 S Qdsmentioning

confidence: 95%

“…[17][18][19] Upon the phase transfer from organic solvent to water, the PL intensity and stability of Ag-based QDs probably are compromised drastically. 21,22 Therefore, the development of a simple and efficient synthetic method to prepare stable and water-dispersible NIR Ag 2 S QDs is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag₂S quantum dots emitting in the second near-infrared biological window

Gui

Sun

Liu³

et al. 2014

Dalton Trans.

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“…2(e). The diffraction peaks could be indexed to the tetragonal phase of α-Ag 2 Se, 23 the data for which are not available in the database so far. The SAED pattern of the nanowires in Fig.…”

Section: Resultsmentioning

confidence: 99%

Growth of photoluminescent Ag₂Se nanowires from a simple precursor solution

Tan

Liu

2014

CrystEngComm

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Near-infrared (NIR) photoluminescent silver selenide (Ag 2 Se) nanowires were synthesized from a precursor solution containing silver nitrate, elemental selenium and hydrazine hydrate ĲN 2 H 4 ·H 2 O). Elemental selenium was reduced by N 2 H 4 ·H 2 O and then reacted with silver nitrate. N 2 H 4 also coordinated with the precursors and the resulting Ag 2 Se nanowires. The singlecrystalline Ag 2 Se nanowires (tetragonal α-Ag 2 Se) grown from the precursor solution had varying diameters depending on the reaction time. After storing at 60°C for 24 h, Ag 2 Se nanowires emitting in the NIR window were obtained. With increasing diameter, the emission intensity decreased until the nanowires became nonphotoluminescent. The photoluminescence lifetime and photostability of the Ag 2 Se nanowires were similar to those of Ag 2 Se quantum dots reported previously. We expect that these Ag 2 Se nanowires will hold a broad spectrum of applications in nanoscale optical or photoelectronic devices.

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“…This is exactly the region, in which Ag 2 Se shows its most intense Bragg peaks [31]. From these data it can be concluded that Ag 2 Se was formed during the XRD measurements as a product of the photodegradation of CdSe–Ag NPs through the X-ray irradiation.…”

Section: Resultsmentioning

confidence: 71%

“…According to previous investigations, CdSe nanocrystals that were exposed to Ag cations in solution could be completely or partially converted to Ag 2 Se via cation exchange [24]. Also, the possibility of Ag 2 Se formation from Ag + and TOPSe solutions at 125–185 °C was shown [31–32]. The authors of [32] synthesized NPs with an exciton-PL maximum at ca.…”

Section: Resultsmentioning

confidence: 99%

AgCl-doped CdSe quantum dots with near-IR photoluminescence

Kotin¹,

Bubenov²,

Mordvinova³

et al. 2017

Beilstein J. Nanotechnol.

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We report the synthesis of colloidal CdSe quantum dots doped with a novel Ag precursor: AgCl. The addition of AgCl causes dramatic changes in the morphology of synthesized nanocrystals from spherical nanoparticles to tetrapods and finally to large ellipsoidal nanoparticles. Ellipsoidal nanoparticles possess an intensive near-IR photoluminescence ranging up to 0.9 eV (ca. 1400 nm). In this article, we explain the reasons for the formation of the ellipsoidal nanoparticles as well as the peculiarities of the process. The structure, Ag content, and optical properties of quantum dots are also investigated. The optimal conditions for maximizing both the reaction yield and IR photoluminescence quantum yield are found.

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Facile Synthesis of Silver Chalcogenide (Ag₂E; E = Se, S, Te) Semiconductor Nanocrystals

Cited by 200 publications

References 31 publications

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag₂S quantum dots emitting in the second near-infrared biological window

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag₂S quantum dots emitting in the second near-infrared biological window

Growth of photoluminescent Ag₂Se nanowires from a simple precursor solution

AgCl-doped CdSe quantum dots with near-IR photoluminescence

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Facile Synthesis of Silver Chalcogenide (Ag2E; E = Se, S, Te) Semiconductor Nanocrystals

Cited by 200 publications

References 31 publications

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag2S quantum dots emitting in the second near-infrared biological window

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag2S quantum dots emitting in the second near-infrared biological window

Growth of photoluminescent Ag2Se nanowires from a simple precursor solution

AgCl-doped CdSe quantum dots with near-IR photoluminescence

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Product

Resources

About

Facile Synthesis of Silver Chalcogenide (Ag₂E; E = Se, S, Te) Semiconductor Nanocrystals

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag₂S quantum dots emitting in the second near-infrared biological window

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag₂S quantum dots emitting in the second near-infrared biological window

Growth of photoluminescent Ag₂Se nanowires from a simple precursor solution