| 1. |
- Li, N., et al.
(författare)
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Tailoring Ordered Mesoporous Titania Films via Introducing Germanium Nanocrystals for Enhanced Electron Transfer Photoanodes for Photovoltaic Applications
- 2021
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Ingår i: Advanced Functional Materials. - : Wiley. - 1616-301X .- 1616-3028. ; 31:34
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Tidskriftsartikel (refereegranskat)abstract
- Based on a diblock-copolymer templated sol–gel synthesis, germanium nanocrystals (GeNCs) are introduced to tailor mesoporous titania (TiO2) films for obtaining more efficient anodes for photovoltaic applications. After thermal annealing in air, the hybrid films with different GeNC content are investigated and compared with films undergoing an argon atmosphere annealing. The surface and inner morphologies of the TiO2/GeOx nanocomposite films are probed via scanning electron microscopy and grazing-incidence small-angle X-ray scattering. The crystal phase, chemical composition, and optical properties of the nanocomposite films are examined with transmission electron microscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible spectroscopy. Special focus is set on the air-annealed nanocomposite films since they hold greater promise for photovoltaics. Specifically, the charge–carrier dynamics of these air-annealed nanocomposite films are studied, and it is found that, compared with pristine TiO2 photoanodes, the GeNC addition enhances the electron transfer, yielding an increase in the short-circuit photocurrent density of exemplary perovskite solar cells and thus, an enhanced device efficiency as well as a significantly reduced hysteresis.
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| 2. |
- Li, Yuanyuan, et al.
(författare)
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Luminescent Transparent Wood
- 2017
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Ingår i: Advanced Optical Materials. - : John Wiley & Sons. - 2195-1071. ; 5:1
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Tidskriftsartikel (refereegranskat)abstract
- Luminescent transparent wood is prepared by combining the complementary properties of naturally grown anisotropic porous wood and luminescent quantum dots. The wood structure introduces strong diffused luminescence and waveguiding, which can potentially be exploited for optoelectronic and photovoltaic applications, such as for planar illumination sources and luminescent buildings/furniture. Images below show the transparency, haze, and luminescence of quantum dot wood.
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| 3. |
- Marinins, Aleksandrs, et al.
(författare)
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All-optical intensity modulation in polymer waveguides doped with si quantum dots
- 2018
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Ingår i: Optics InfoBase Conference Papers. - : Optical Society of America. - 9781557528209
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Konferensbidrag (refereegranskat)abstract
- We demonstrate all-optical intensity modulation in integrated PMMA optical waveguides doped with silicon quantum dots. The 1550 nm probe signal is absorbed by free carriers excited in silicon quantum dots with 405 nm pump light.
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| 4. |
- Suuronen, Erik J., et al.
(författare)
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Tissue-engineered injectable collagen-based matrices for improved cell delivery and vascularization of ischemic tissue using CD133+progenitors expanded from the peripheral blood
- 2006
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Ingår i: Circulation. - : LIPPINCOTT WILLIAMS and WILKINS. - 0009-7322 .- 1524-4539. ; 114, s. I138-I144
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Tidskriftsartikel (refereegranskat)abstract
- Background-The use of stem and/or progenitor cells to achieve potent vasculogenesis in humans has been hindered by low cell numbers, implant capacity, and survival. This study investigated the expansion of CD133(+) cells and the use of an injectable collagen-based tissue engineered matrix to support cell delivery and implantation within target ischemic tissue. Methods and Results-Adult human CD133(+) progenitor cells from the peripheral blood were generated and expanded by successive removal and culture of CD133(-) cell fractions, and delivered within an injectable collagen-based matrix into the ischemic hindlimb of athymic rats. Controls received injections of phosphate-buffered saline, matrix, or CD133(+) cells alone. Immunohistochemistry of hindlimb muscle 2 weeks after treatment revealed that the number of CD133(+) cells retained within the target site was greater than 2-fold greater when delivered by matrix than when delivered alone (P less than 0.01). The transplanted CD133(+) cells incorporated into vascular structures, and the matrix itself also was vascularized. Rats that received matrix and CD133(+) cells demonstrated greater intramuscular arteriole and capillary density than other treatment groups (P less than 0.05 and P less than 0.01, respectively). Conclusions-Compared with other experimental approaches, treatment of ischemic muscle tissue with generated CD133(+) progenitor cells delivered in an injectable collagen-based matrix significantly improved the restoration of a vascular network. This work demonstrates a novel approach for the expansion and delivery of blood CD133(+) cells with resultant improvement of their implantation and vasculogenic capacity.
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| 5. |
- Sychugov, Ilya, et al.
(författare)
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Luminescent silicon nanocrystals as downconverters for photovoltaic and lighting applications
- 2016
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Ingår i: Asia Communications and Photonics Conference, ACP. - : OSA - The Optical Society.
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Konferensbidrag (refereegranskat)abstract
- Nanocrystals offer new functionalities for optoelectronics. Ensemble and single-dot measurements of chemically-synthesized silicon nanocrystals revealed high quantum yield, narrow homogeneous linewidth, and large Stokes shift, confirming application feasibility for these non-toxic and abundant material nanoparticles. Asia Communications and Photonics Conferene (ACP)
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