Surface fluorination treated indium-based quantum dots as a nonlinear saturable absorber for a passive Q-switched 1.0 μm laser

Zhang, Xiaoli; Lou, Yajun; Hu, Lei; Duan, Weijia; Chen, Guojie; Fan, Bingfeng; Zhao, Weiren; Zhang, Xinhai

doi:10.1039/d2ma00442a

Cited by 6 publications

(2 citation statements)

References 37 publications

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“…Nanostructured materials are now among the most researched alternatives to further improve the performance of conventional MIPs. Because molecularly imprinted polymers nanoparticles (nano‐MIPs) have higher site accessibility for analytes and lower mass transfer resistance due to their high surface‐to‐volume ratio 11 . This improves the rebinding capacity and imparts faster rebinding kinetics for the target molecules, and so is an efficient strategy to overcome the limitations of bulk MIPs.…”

Section: Introductionmentioning

confidence: 99%

Self‐assembly imprinting fabrication of shell‐crosslinking fluorescent nanoparticles for the detection of sialic acid

Yan,

Liu,

2024

Journal of Polymer Science

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A new strategy for preparing sialic acid (SA)‐quenching fluorescent nanoparticles by macromolecular self‐assembly and molecular imprinting technique is suggested. An amphiphilic block copolymer polystyrene‐b‐poly(glycidyl methacrylate) (PS‐b‐PGMA) was designed and synthesized. After functionalization, PS‐b‐PGMA was co‐assembled with the template molecule SA to prepare SA‐imprinted fluorescent nanoparticles, named as nano‐FMIPs. In this process, the shell layers of nanoparticles were photo‐crosslinked upon 365 nm UV light to stabilize the recognition site. The size of the crosslinked shell was found to be increased to 420 ± 5 nm by TEM and DLS measurements. After extraction of SA, recognition cavities complementary in shape, size, and chemical function toward the template SA were left on the surface of nano‐FMIPs, which can selectively rebind the target SA in a mixture of structurally similar compounds. It is found that SA can significantly quench the fluorescence intensity of nano‐FMIPs linearly within a concentration range of 1 × 10−2 ~ 2 × 10−6 mol L−1 and a detection limit of 1.55 × 10−6 mol L−1. This strategy provides a new approach for preparing surface‐imprinted nano‐FMIPs for the quantitative detection of SA, and the nano‐FMIPs may have great potential for biomedical application.

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Section: Introductionmentioning

confidence: 99%

Self‐assembly imprinting fabrication of shell‐crosslinking fluorescent nanoparticles for the detection of sialic acid

Yan,

Liu,

2024

Journal of Polymer Science

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“…[ 28,29 ] Although common 1 µm solid‐state Q‐switched lasers based on InP QD SA have been reported. [ 30 ] To the best of our knowledge, there is no report of InP QDs as efficient SAs for fiber laser systems. In this work, we synthesized InP/ZnSeS/ZnS QDs and investigated their nonlinear absorption properties.…”

Section: Introductionmentioning

confidence: 99%

InP/ZnSeS/ZnS Core–Shell Quantum Dots as Novel Saturable Absorbers in Mode‐Locked Fiber Lasers

Lou

et al. 2022

Advanced Optical Materials

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In this study, red light emitting InP/ZnSeS/ZnS quantum dots (QDs) are prepared by thermal injection method. The results show that the InP/ZnSeS/ZnS QDs saturable absorbers (SA) have good nonlinear saturable absorption properties with modulation depth of 24.2% and saturation intensity of 0.08 KW cm−2. Then the QD SAs are applied to the erbium‐doped fiber laser (EDFL) ring cavity system, and a mode‐locked laser pulse with a pulse width of 635 fs is generated. In addition, the pulse width is determined by the carrier recovery time, which is closely related to the defect density in the material. A large number of defects are eliminated in the QDs by hydrogen fluoride (HF) treatment, and the pulse width is reduced from 635 to 450 fs. Results of time‐resolved photoluminescence and ultrafast transient absorption spectroscopy (TAS) show that HF treatment indeed reduces defects in InP/ZnSeS/ZnS QDs, indicated by the decrease of the carrier recovery time. This is different from the reported 2D SA materials, which usually reduce the carrier recovery time by increasing the defect density. This study will inspire new applications of QDs in ultrafast photonics and nonlinear optics.

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Emission-tunable inorganic metal halide perovskite nanocrystals for passive Q-switched fiber laser

Liu,

Lai,

Zhong

et al. 2024

J Mater Sci: Mater Electron

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Surface fluorination treated indium-based quantum dots as a nonlinear saturable absorber for a passive Q-switched 1.0 μm laser

Abstract: InP/ZnSe/ZnS QDs with surface fluorination treatment were fabricated and their nonlinear saturable absorption properties explored. Passive Q-switching of diode-pumped Nd:YVO4 near-infrared laser at 1064 nm (∼1.0 μm) using InP-HF QDs as saturable absorber (SA) is observed.

Cited by 6 publications

References 37 publications

Self‐assembly imprinting fabrication of shell‐crosslinking fluorescent nanoparticles for the detection of sialic acid

Self‐assembly imprinting fabrication of shell‐crosslinking fluorescent nanoparticles for the detection of sialic acid

InP/ZnSeS/ZnS Core–Shell Quantum Dots as Novel Saturable Absorbers in Mode‐Locked Fiber Lasers

Emission-tunable inorganic metal halide perovskite nanocrystals for passive Q-switched fiber laser

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