Hydrothermal Synthesis of NAC-capped II–VI Semiconductor ZnSe Quantum Dots in Acidic Condition

Lee, Yong-Shin; Bu, Hang-Beom; Taniguchi, Tomoyo; Takagi, Tohru; Sobue, Susumu; Yamada, Hitoshi; Iwaki, Takao; Kim, DaeGwi

doi:10.1246/cl.160431

Cited by 20 publications

(15 citation statements)

References 25 publications

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“…One promising method is the use of water-soluble QDs because short-chain ligands such as thioglycolic acid (TGA), 3mercaptopropionic acid (MPA), and N-acetyl-L-cysteine (NAC) are often used to synthesise water-soluble QDs 11,[31][32][33][34][35][36] . These ligands are 0.4-0.6 nm long and are shorter than the TOPO and OA used to synthesise oil-soluble QDs.…”

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confidence: 99%

Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly

et al. 2020

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In quantum dot superlattices, wherein quantum dots are periodically arranged, electronic states between adjacent quantum dots are coupled by quantum resonance, which arises from the short-range electronic coupling of wave functions, and thus the formation of minibands is expected. Quantum dot superlattices have the potential to be key materials for new optoelectronic devices, such as highly efficient solar cells and photodetectors. Herein, we report the fabrication of CdTe quantum dot superlattices via the layer-by-layer assembly of positively charged polyelectrolytes and negatively charged CdTe quantum dots. We can thus control the dimension of the quantum resonance by independently changing the distances between quantum dots in the stacking (out-of-plane) and in-plane directions. Furthermore, we experimentally verify the miniband formation by measuring the excitation energy dependence of the photoluminescence spectra and detection energy dependence of the photoluminescence excitation spectra.

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confidence: 99%

Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly

et al. 2020

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“…45 The major difference between the PLQYs of ZnSe and ZnSe:Mn QDs is considered the pH of the precursor solution, which is well known as an essential parameter in the hydrothermal synthesis of semiconductor QDs. 46,47 The optimum pH for the synthesis of the ZnSe QDs has been reported as 6. 45 In contrast, if ZnSe:Mn QDs are synthesised at pH 6, no Mn PL is observed, i.e., Mn 2+ cannot be doped.…”

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confidence: 99%

“…29 However, the PLQY of ZnSe QDs synthesised under alkaline conditions is low. 46 In other words, the condition necessary for Mn 2+ doping (pH 10) is significantly different from the optimum condition for preparing the host ZnSe QDs to suppress nonradiative recombination processes (pH 6). This is the reason for the low PLQYs of ZnSe:Mn QDs.…”

Section: Introductionmentioning

confidence: 99%

Water-soluble ZnSe/ZnS:Mn/ZnS quantum dots convert UV to visible light for improved Si solar cell efficiency

et al. 2021

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“…In addition to being nonvolatile and nontoxic, NAC possesses good water solubility and excellent biocompatibility. [36][37][38][39][40] To date, NAC-capped CdTe/CdS, 36,37 CdTe, 37,38 and ZnSe QDs, 39,40 have been successfully synthesized with excellent PL properties. Therefore, NAC shows great potential for use as a ligand in the synthesis of water-soluble CIS QDs.…”

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confidence: 99%

Synthesis of Water-Soluble CuInS2 Quantum Dots by a Hydrothermal Method and Their Optical Properties

Iida

Uehigashi

Ichida

et al. 2019

Bulletin of the Chemical Society of Japan

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Water-soluble CuInS2 (CIS) quantum dots (QDs) were hydrothermally prepared in the presence of N-acetyl-L-cysteine (NAC) as a stabilizer, and the optimal hydrothermal synthetic conditions for NAC-capped CIS QDs were investigated. The photoluminescence (PL) quantum yield (QY) of the CIS QDs synthesized under optimal conditions was 4%, which was comparable with the highest QY reported for water-soluble CIS core QDs. The introduction of a ZnS shell produced CIS/ZnS core/shell QDs and further increased the PL QY to 30%. Furthermore, bilayer structures consisting of Au nanoparticles and CIS/ZnS QDs were fabricated using a layer-by-layer method to enhance the PL of the CIS/ZnS QDs on the basis of the localized surface plasmon resonance of Au nanoparticles.

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Hydrothermal Synthesis of NAC-capped II–VI Semiconductor ZnSe Quantum Dots in Acidic Condition

Cited by 20 publications

References 25 publications

Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly

Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly

Water-soluble ZnSe/ZnS:Mn/ZnS quantum dots convert UV to visible light for improved Si solar cell efficiency

Synthesis of Water-Soluble CuInS2 Quantum Dots by a Hydrothermal Method and Their Optical Properties

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