From Indium‐Doped Ag2S to AgInS2 Nanocrystals: Low‐Temperature In Situ Conversion of Colloidal Ag2S Nanoparticles and Their NIR Fluorescence

Shang, Huishan; Di, Qiumei; Ji, Muwei; Bai, Bing; Li, Jiajia; Chen, Wenxing; Xu, Meng; Rong, Hongpan; Liu, Jia; Zhang, Jiatao

doi:10.1002/chem.201802973

Cited by 21 publications

(8 citation statements)

References 40 publications

(69 reference statements)

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“…In both cases, when the DMTU solution was injected, a pale-yellow solution (Ag-dodecanethiol complex) became orange, red, and finally dark brown, which indicated the formation of the Ag 2 S intermediate. The Ag 2 S intermediate was subsequently converted to AgInS 2 by cation exchange or resource-host-type reactions [29,30]. Figure 1 shows the UV-Vis, PL spectra, and TEM images and size distribution histograms of AgInS 2 QDs synthesized by the immediate injection and dropwise injection methods.…”

Section: Synthesis Of High-quality Agins 2 Quantum Dotsmentioning

confidence: 99%

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

et al. 2019

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Highly luminescent silver indium sulfide (AgInS 2 ) nanoparticles were synthesized by dropwise injection of a sulfur precursor solution into a cationic metal precursor solution. The two-step reaction including the formation of silver sulfide (Ag 2 S) nanoparticles as an intermediate and their conversion to AgInS 2 nanoparticles, occurred during the dropwise injection. The crystal structure of the AgInS 2 nanoparticles differed according to the temperature of the metal precursor solution. Specifically, the tetragonal crystal phase was obtained at 140 • C, and the orthorhombic crystal phase was obtained at 180 • C. Furthermore, when the AgInS 2 nanoparticles were coated with a gallium sulfide (GaS x ) shell, the nanoparticles with both crystal phases emitted a spectrally narrow luminescence, which originated from the band-edge transition of AgInS 2 . Tetragonal AgInS 2 exhibited narrower band-edge emission (full width at half maximum, FWHM = 32.2 nm) and higher photoluminescence (PL) quantum yield (QY) (49.2%) than those of the orthorhombic AgInS 2 nanoparticles (FWHM = 37.8 nm, QY = 33.3%). Additional surface passivation by alkylphosphine resulted in higher PL QY (72.3%) with a narrow spectral shape.in the visible region as well as large optical absorption coefficients, which are characteristic for direct semiconductors [9][10][11][12][13]. Among these QDs, silver indium sulfide (AgInS 2 ) nanoparticles (NPs) with a band gap energy of 1.87 eV have attracted increasing attention [14,15]. A universal challenge during the synthesis of AgInS 2 NPs is to balance the reactivity of two cationic precursors against one anionic precursor [10,16]. In the past, the thermal decomposition of a single molecular precursor was used to avoid the reactivity problem, which resulted in a high (~50%) PL QY for AgInS 2 -ZnS NPs [17][18][19]. The limitations of this method are the necessity of designing a molecular precursor for each composition and the difficulty of controlling the particle size and shape due to the complexity of the decomposition process [20]. Alternatively, the reactions of the cation mixture with sulfur-containing species at higher temperatures are common. A typical example uses silver nitrate (AgNO 3 ), indium acetate (In(OAc) 3 ), and 1-dodecanethiol (DDT) dissolved in 1-octadecene (ODE), which were heated until DDT reacted with metal cations to generate AgInS 2 NPs [21]. Although the "heating up" approach achieved better PL QY, it was still difficult to regulate the particle size because the growth process mainly occurred by Ostwald ripening [22,23]. At the same time, the method of particle size control by the rapid injection of precursors into a hot solvent, which has been commonly used for binary semiconductor QDs, was also adopted for the AgInS 2 NPs synthesis and achieved good size distribution with a PL QY as high as 59% [24][25][26]. Although the control over particle size and composition was achieved, none of these attempts generated a narrow band-edge emission corresponding to common II-VI semiconductor QD...

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Section: Synthesis Of High-quality Agins 2 Quantum Dotsmentioning

confidence: 99%

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

et al. 2019

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“…36 Figure S12B demonstrated that In 3d 5/2 and 3d 3/2 peaks were located at 444.7 and 452.3 eV, which was in agreement with +3 state of In. 37 The theoretical simulation (Figure S13 and Table S4) revealed the coordination environments of Cu and In in OA-CdS SNCs. Due to the lowest formation energy (E f = À1.013 eV) of substitution, Cu-and In-doped OA-CdS SNCs, Cu and In dopants preferred to coordinate with S atoms and occupy the Cd sites.…”

Section: Tunable Pl Property Of Cu In Dual-doped Cds Sncs Triggered By Sveice Strategymentioning

confidence: 95%

Unique Cation Exchange in Nanocrystal Matrix via Surface Vacancy Engineering Overcoming Chemical Kinetic Energy Barriers

Bai

Zhao

et al. 2020

Chem

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“…Series of such NCs in group I‐III‐VI and I‐II‐IV‐VI semiconductors are extensively studied and explored for designing both light‐emitting and harvesting devices . Among different synthesis methods of these multinary NCs, in situ chemical conversion is one efficient protocol for keeping the intrinsic morphologies of starting materials . For instance, Pradhan and his co‐workers obtained core/shell Sb 2 Se 3 /Cu 3 SbSe 3 nanorod heterostructures with NIR‐localized surface plasmon resonance (SPR) .…”

Section: Figurementioning

confidence: 99%

“…[7][8][9][10] Among different synthesis methods of these multinary NCs, in situ chemical conversion is one efficient protocol for keeping the intrinsic morphologies of starting materials. [11] For instance, Pradhana nd hisc o-workers obtained core/shell Sb 2 Se 3 /Cu 3 SbSe 3 nanorod heterostructures with NIR-localized surface plasmon resonance (SPR) . It wasa chieved by adding Cu I under specific reaction conditions to presynthesized Sb 2 Se 3 rods.…”

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confidence: 99%

Near‐Infrared Luminescent Ternary Ag₃SbS₃ Quantum Dots by in situ Conversion of Ag Nanocrystals with Sb(C₉H₁₉COOS)₃

Wang

Zhao

et al. 2018

Chemistry A European J

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Differently from the normal three single precursor method to produce colloidal ternary quantum dots (QDs), herein ternary Ag3SbS3 quantum dots (QDs) with efficient near‐infrared (NIR) luminescence have been prepared by a new facile in situ conversion of Ag nanocrystals (NCs) with a binary Sb/S organic precursor Sb(C9H19COOS)3 under low temperature. The unprecedented construction evolution from Ag NCs to Ag3SbS3/Ag hetero‐structure and final monodisperse Ag3SbS3 QDs has been demonstrated. These novel Ag3SbS3 QDs exhibit efficient NIR emission at ≈1263 nm and possess high colloidal stability.

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From Indium‐Doped Ag₂S to AgInS₂ Nanocrystals: Low‐Temperature In Situ Conversion of Colloidal Ag₂S Nanoparticles and Their NIR Fluorescence

Cited by 21 publications

References 40 publications

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

Unique Cation Exchange in Nanocrystal Matrix via Surface Vacancy Engineering Overcoming Chemical Kinetic Energy Barriers

Near‐Infrared Luminescent Ternary Ag₃SbS₃ Quantum Dots by in situ Conversion of Ag Nanocrystals with Sb(C₉H₁₉COOS)₃

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From Indium‐Doped Ag2S to AgInS2 Nanocrystals: Low‐Temperature In Situ Conversion of Colloidal Ag2S Nanoparticles and Their NIR Fluorescence

Cited by 21 publications

References 40 publications

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots

Unique Cation Exchange in Nanocrystal Matrix via Surface Vacancy Engineering Overcoming Chemical Kinetic Energy Barriers

Near‐Infrared Luminescent Ternary Ag3SbS3 Quantum Dots by in situ Conversion of Ag Nanocrystals with Sb(C9H19COOS)3

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Product

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From Indium‐Doped Ag₂S to AgInS₂ Nanocrystals: Low‐Temperature In Situ Conversion of Colloidal Ag₂S Nanoparticles and Their NIR Fluorescence

Near‐Infrared Luminescent Ternary Ag₃SbS₃ Quantum Dots by in situ Conversion of Ag Nanocrystals with Sb(C₉H₁₉COOS)₃