Synthesis and Bioapplications of Ag<sub>2</sub>S Quantum Dots with Near‐Infrared Fluorescence

Ding, Caiping; Huang, Youju; Shen, Zheyu; Chen, Xiaoyuan

doi:10.1002/adma.202007768

Cited by 118 publications

(84 citation statements)

References 179 publications

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“…Based on our previous report, this W(CO)6-mediated synthetic strategy would yield Ag nanoparticles with good crystallinity [13] , suggesting that the Pt polysulfide precursor would definitely react with Ag. Due to the high solubility product constant (Ksp, Ag2S, 298 K= 6.3×10 -50 ) between the sulfide ions (S 2-) and Ag [19,20] , the Ag2S phase appeared in the Na2S-served Ag/C sample (Figure 3(c)), implying that the high affinity and reactivity of S 2towards Ag would break the long-range ordered structure of Ag crystal and transfer metal phase into semiconductor phase. Thus, the bidentate ligand (S5 2-) probably amorphized the surface of Ag in the same manner even though the average valence value for each sulfur atom of Pt polysulfide precursor is lower than that for S 2-.…”

Section: Resultsmentioning

confidence: 99%

The Synthesis of Low Pt loading Ag_core- Pt atoms-exposed_shell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

Zhu

Luan

et al. 2022

J. Phys.: Conf. Ser.

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Platinum-based nanomaterials are well-known to show excellent hydrogen evolution reaction (HER) catalytic performance. The sophisticated structural design facilitates the development of related disciplines such as water splitting devices. Here, a kind of Agcore- Pt atoms-exposedshell structure could be synthesized through ligand exchange between Ag nanoparticles and Pt polysulfide precursor at room temperature (RT). The Ag core maintains its face-centered cubic phase (FCC) crystal phase after the formation of Agcore- Pt atoms-exposedshell structure. While Pt atoms account for only 0.4617 percent of the catalyst mass. With a further electrochemical reduction of Pt (IV) atoms into metallic state Pt (0) atoms from -1.2 V vs. RHE to 0.4 V vs. RHE, the HER catalytic performance of Agcore- Pt atoms-exposedshell would exceed that of commercial 20% Pt/C at low potentials (<-0.487 V vs. RHE). Furthermore, we found the HER performance is stable, which verifies that the Pt polysulfide is tightly bound to the surface of Ag. Specifically, the present approach shows great potential for the construction of nanostructure with high atomic utilization.

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Section: Resultsmentioning

confidence: 99%

The Synthesis of Low Pt loading Ag_core- Pt atoms-exposed_shell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

Zhu

Luan

et al. 2022

J. Phys.: Conf. Ser.

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“…[ 64,65 ] In particular, QDs [ 66–70 ] as zero‐dimensional (0D) nanomaterials have been explored as the fluorescence probes due to the unique FRET process, stable photoluminescence, and biocompatibility. [ 71 ] A typical fluorescence‐based metabolite sensing process with the introduction of nanomaterials is illustrated in Figure 4A. [ 64 ] The nitrogen‐doped graphene QDs (N‐GQDs) were combined with V 2 O 5 nanosheets for cysteine detection with LOD reaching 50 nmol, where the V 2 O 5 nanosheets functioned as the fluorescence quencher and cysteine recognizer.…”

Section: Nanomaterials‐assisted Metabolic Analysismentioning

confidence: 99%

Nanomaterials‐assisted metabolic analysis toward in vitro diagnostics

2022

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In vitro diagnostics (IVD) has played an indispensable role in healthcare system by providing necessary information to indicate disease condition and guide therapeutic decision. Metabolic analysis can be the primary choice to facilitate the IVD since it characterizes the downstream metabolites and offers real‐time feedback of the human body. Nanomaterials with well‐designed composition and nanostructure have been developed for the construction of high‐performance detection platforms toward metabolic analysis. Herein, we summarize the recent progress of nanomaterials‐assisted metabolic analysis and the related applications in IVD. We first introduce the important role that nanomaterials play in metabolic analysis when coupled with different detection platforms, including electrochemical sensors, optical spectrometry, and mass spectrometry. We further highlight the nanomaterials‐assisted metabolic analysis toward IVD applications, from the perspectives of both the targeted biomarker quantitation and untargeted fingerprint extraction. This review provides fundamental insights into the function of nanomaterials in metabolic analysis, thus facilitating the design of next‐generation diagnostic devices in clinical practice.

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“…[ 4 ] Among them, Ag 2 S QDs have attracted arising interest due to their decent biocompatibility over other nanomaterials. [ 5 ] However, the PLQYs of most NIR‐II emissive Ag 2 S QDs are limited to less than 20%. [ 5,6 ] Therefore, it is still a great challenge to significantly improve the PLQY of Ag 2 S QDs.…”

Section: Introductionmentioning

confidence: 99%

“…[21] Currently, the most widely used ligands for silver chalcogenide QDs with a considerable PLQY are thiolates (RS − ) ligands. [5,6,[21][22][23][24][25][26] Despite the great progress made in the synthesis of QDs with various ligands, a further improvement of PLQY is still limited probably due to the inherent steric hindrance of organic ligands. [27] Over the past 10 years, the surface passivation of Cd-, Pbbased chalcogenide QDs, and InP-based QDs has highlighted the effect of halide atoms (especially chloride) on improving PL performance of QDs.…”

Section: Introductionmentioning

confidence: 99%

“…[5] However, the PLQYs of most NIR-II emissive Ag 2 S QDs are limited to less than 20%. [5,6] Therefore, it is still a great challenge to significantly improve the PLQY of Ag 2 S QDs.The PL performance of QDs is attributed to the recombination radiation of localized excitons (electron-hole pair). However, nonradiative Auger recombination, arising from the escape of photoexcited carriers to the QD surface, leads to PL quenching.…”

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confidence: 99%

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Photoluminescence Enhancement of NIR‐II Emissive Ag₂S Quantum Dots via Chloride‐Mediated Growth and Passivation

Pan

Yang

et al. 2022

Advanced Optical Materials

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decent biocompatibility over other nanomaterials. [5] However, the PLQYs of most NIR-II emissive Ag 2 S QDs are limited to less than 20%. [5,6] Therefore, it is still a great challenge to significantly improve the PLQY of Ag 2 S QDs.The PL performance of QDs is attributed to the recombination radiation of localized excitons (electron-hole pair). However, nonradiative Auger recombination, arising from the escape of photoexcited carriers to the QD surface, leads to PL quenching. [7,8] One of the alternative strategies to improve the optical properties of QDs is the heteroatomic doping. [9] Through alloying heavy metal atoms (e.g., Pb, Au) into silver chalcogenide, nonradiative recombination of the excitons can be well prevented, and thus achieving high PLQYs of more than 30%. [10,11] Notably, a recently reported case of alloyed AgAuSe QDs has achieved a high PLQY of 65.3% at 978 nm emission. [11] These cation doping strategies probably suppress cation vacancies and crystal defects resulted from the high mobility of Ag + . [12] Undercoordinated surface atoms with dangling bonds can produce surface traps, which become sites for nonradiative recombination and quench PL. [13,14] Therefore, another representative strategy is the passivation of the QD surface with thick and robust inorganic shells or appropriate surface ligands to suppress the surface trap states. [7,[15][16][17] For example, the coating of ZnS shell on the Ag 2 S QDs has been applied to reduce surface defects. [18] However, these methods have failed to achieve a high PLQY due to the large lattice mismatch (approximately 16%) between Ag 2 S core and ZnS shell. [19] Interestingly, the surface passivation of Ag 2 S QDs with Zn−thiol or Cd−thiol complex ligand shell has reduced surface defects and achieved an approximately sevenfold PL enhancement on original QDs with a PLQY of 3.1%. [20] Generally, the robust bonding of ligands to the surface atoms of QDs can inhibit the nonradiative recombination, and the optical properties of QDs can be directly influenced by QDligand binding affinity due to electronic and steric effects. [13] According to the principle of hard and soft acid-base, one of the strongest bonding is between Ag + and thiolates (RS − ) ligand, as a typical combination of Lewis soft acid and soft base. The Lewis hard base ligands such as amines (RNH 2 ), carboxylates Ag 2 S quantum dots (QDs) with high photoluminescence quantum yield (PLQY) in the second near-infrared (NIR-II, 1000-1700 nm) window are urgently pursued. Halide atoms (especially chloride) have been studied as inorganic capping ligands on improving the PLQY of Cd-, Pb-based chalcogenide QDs; however, it remains a challenge to well replace the organic ligand with chloride ligand from silver chalcogenide QDs. Herein, a novel strategy to prepare Ag 2 S QDs with significant photoluminescence (PL) enhancement via chloride-mediated growth and passivation is demonstrated. The oleylamine and oleate ligands on the surface of silver-rich Ag 2 S QDs are readily replaced by chloride ligands d...

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Synthesis and Bioapplications of Ag₂S Quantum Dots with Near‐Infrared Fluorescence

Cited by 118 publications

References 179 publications

The Synthesis of Low Pt loading Ag_core- Pt atoms-exposed_shell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

The Synthesis of Low Pt loading Ag_core- Pt atoms-exposed_shell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

Nanomaterials‐assisted metabolic analysis toward in vitro diagnostics

Photoluminescence Enhancement of NIR‐II Emissive Ag₂S Quantum Dots via Chloride‐Mediated Growth and Passivation

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Synthesis and Bioapplications of Ag2S Quantum Dots with Near‐Infrared Fluorescence

Cited by 118 publications

References 179 publications

The Synthesis of Low Pt loading Agcore- Pt atoms-exposedshell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

The Synthesis of Low Pt loading Agcore- Pt atoms-exposedshell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

Nanomaterials‐assisted metabolic analysis toward in vitro diagnostics

Photoluminescence Enhancement of NIR‐II Emissive Ag2S Quantum Dots via Chloride‐Mediated Growth and Passivation

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Product

Resources

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Synthesis and Bioapplications of Ag₂S Quantum Dots with Near‐Infrared Fluorescence

The Synthesis of Low Pt loading Ag_core- Pt atoms-exposed_shell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

The Synthesis of Low Pt loading Ag_core- Pt atoms-exposed_shell Structure by Ligand Exchange Method with High Electrocatalytic Performance for Hydrogen Evolution Reaction

Photoluminescence Enhancement of NIR‐II Emissive Ag₂S Quantum Dots via Chloride‐Mediated Growth and Passivation