• Title/Summary/Keyword: InAs 양자점

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Morphological and Photoluminescence Characteristics of Laterally Self-aligned InGaAs/GaAs Quantum-dot Structures (수평 자기정렬 InGaAs/GaAs 양자점의 형태 및 분광 특성 연구)

  • Kim J. O.;Choe J. W.;Lee S. J.;Noh S. K.
    • Journal of the Korean Vacuum Society
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    • v.15 no.1
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    • pp.81-88
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    • 2006

  • Laterally self-aligned InGaAs/GaAs quantum-dots (QDs) have been fabricated by using a multilayer stacking technique. For the growth optimization, we vary the number of stacks and the growth temperature in the ranges of 1-15 periods and $500-540^{\circ}C$. respectively, Atomic force microscope (AFM) images and photoluminescence (PL) spectra reveal that the lateral alignment of QDs is enhanced in extended length by an increased stack period, but severely degrades into film-like wires above a critical growth temperature. The morphological and the photoluminescence characteristics of laterally self-aligned InGaAs QDs have been analyzed through mutual comparisons among four samples with different parameters. An anisotropic arrangement develops with increasing number of stacks, and high-temperature capping allows isolated QDs to be spontaneously organized into a one-dimensionally aligned chain-like shape over a few ${\mu}m$, Moreover, the migration time allowed by growth interruption plays an additional important role in the chain arrangement of QDs. The QD chains capped at high temperature exhibit blue shifts in the emission energy, which may be attributed to a slight outdiffusion of In from the InGaAs QDs.

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Analysis of Human Serum Amyloid A-1 Concentrations Using a Lateral Flow Immunoassay with CdSe/ZnS Quantum Dots (Human Serum Amyloid A-1 단백질 농도 분석을 위한 CdSe/ZnS 양자점 기반의 Lateral Flow Immunoassay 방법 개발)

  • Fajri, Aidil;Goh, Eunseo;Lee, Sanghyuk;Lee, Hye Jin
    • Applied Chemistry for Engineering
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    • v.30 no.4
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    • pp.429-434
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    • 2019

  • A lateral flow immunoassay platform utilizing antibody functionalized water soluble CdSe/ZnS semiconductor quantum dots (QDs) was developed for the analysis of human serum amyloid A-1 (hSAA1) in a buffer solution. hSAA1 was chosen as a target protein because it is regarded as a potential biomarker associated with early diagnosis and prognosis in patients of lung cancer. The immunoassay strip on a nitrocellulose membrane was fabricated by spraying two lines composed of a test line with a monoclonal antibody against hSAA1 (10G1) (anti hSAA1) and a control line of anti-chicken IgY. While the CdSe/ZnS QDs synthesized in an organic phase were transferred to a water phase by ligand exchange using carboxylic acid modified alkane thiol. The QDs was then conjugated to monoclonal antibody against hSAA1 (14F8) [anti hSAA1 (14F8)] and used as a fluorescent detection probe. The sequential lateral flow of hSAA1 in different concentration and QDs-anti hSAA1 (14F8) complex allowed to form the surface sandwich complex of anti hSAA1 (10G1)/hSAA1/QD-anti hSAA1 (14F8), which was then analyzed using fluorescence microscope. A 100 nM concentration of hSAA1 protein can be detected by naked eyes under an optimized lateral flow buffer condition with a sensing time of 5 mins.

  • https://doi.org/10.14478/ace.2019.1044 인용 PDF KSCI HTML