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  • AIP Publishing  (8)
  • 1
    Online Resource
    Online Resource
    Radiation-induced direct bandgap transition in few-layer MoS2
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 13 ( 2017-09-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 13 ( 2017-09-25)
    Abstract: We report photoluminescence (PL) spectroscopy of air-suspended and substrate-supported molybdenum disulfide (MoS2) taken before and after exposure to proton radiation. For 2-, 3-, and 4-layer MoS2, the radiation causes a substantial ( & gt;10×) suppression of the indirect bandgap emission, likely due to a radiation-induced decoupling of the layers. For all samples measured (including the monolayer), we see the emergence of a defect-induced shoulder peak at around 1.7 eV, which is redshifted from the main direct bandgap emission at 1.85 eV. Here, defects induced by the radiation trap the excitons and cause them to be redshifted from the main direct band emission. After annealing, the defect-induced sideband disappears, but the indirect band emission remains suppressed, indicating a permanent transition into a direct bandgap material. While suspended 2-, 3-, and 4-layer MoS2 show no change in the intensity of the direct band emission after radiation exposure, substrate-supported MoS2 exhibits an approximately 2-fold increase in the direct bandgap emission after irradiation. Suspended monolayer MoS2 shows a 2–3× drop in PL intensity; however, substrate-supported monolayer MoS2 shows a 2-fold increase in the direct band emission.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5005121
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Temperature dependence of Auger recombination in highly injected crystalline silicon
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 112, No. 11 ( 2012-12-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 112, No. 11 ( 2012-12-01)
    Abstract: The Auger lifetime in crystalline silicon has been measured under high injection conditions using an injection- and temperature-dependent photoconductance apparatus, across a temperature range from 243 to 473 K (−30 to 200 °C). The corresponding ambipolar Auger coefficient was found to have a value of 1.6 × 10−30 cm6/s at 303 K (30 °C) at an injection level of 5 × 1016 cm−3. The Auger coefficient was found to decrease between 243 K and 303 K, and then remain approximately constant up to 473 K. An empirical parameterization of the measured ambipolar Auger coefficient is provided.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4768900
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Taguchi analysis of parameters for small-diameter single wall carbon nanotube growth
    AIP Publishing ; 2017
    In:  AIP Advances Vol. 7, No. 9 ( 2017-09-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 7, No. 9 ( 2017-09-01)
    Abstract: Small diameter single wall carbon nanotubes are desirable for various physical and electrical properties of carbon nanotubes. Here, we report the sensitivities of parameters and the optimal conditions for small diameter carbon nanotube growth by chemical vapor deposition (CVD). These results were obtained using the Taguchi method, which is commonly used to find the optimal parameters of various processes. The possible parameter ranges given by the experimental equipment and laboratory conditions, we attempted several times to determine the proper ranges, using photoluminescence (PL) imaging to determine the exact positions of suspended carbon nanotubes on the quartz substrates after synthesis. The diameters of the carbon nanotubes were then determined from the radial breathing modes (RBM) using Raman spectroscopy with a 785nm wavelength laser. Among the 4 major parameters listed above, we concluded that the temperature was the most significant parameter in determining carbon nanotube diameter, hydrogen flow rate was the second most significant, the ethanol and argon gas flow rate was the third, and finally time was the least significant factor.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5000702
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2583909-3
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  • 4
    Online Resource
    Online Resource
    ZnO:H indium-free transparent conductive electrodes for active-matrix display applications
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 22 ( 2014-12-01)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 22 ( 2014-12-01)
    Abstract: Transparent conductive electrodes based on hydrogen (H)-doped zinc oxide (ZnO) have been proposed for active-matrix (AM) display applications. When fabricated with optimal H plasma power and optimal plasma treatment time, the resulting ZnO:H films exhibit low sheet resistance of 200 Ω/◻ and high average transmission of 85% at a film thickness of 150 nm. The demonstrated transparent conductive ZnO:H films can potentially replace indium-tin-oxide and serve as pixel electrodes for organic light-emitting diodes as well as source/drain electrodes for ZnO-based thin-film transistors. Use of the proposed ZnO:H electrodes means that two photomask stages can be removed from the fabrication process flow for ZnO-based AM backplanes.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4903499
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Enhanced photoluminescence in air-suspended carbon nanotubes by oxygen doping
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 15 ( 2016-10-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 15 ( 2016-10-10)
    Abstract: We report photoluminescence (PL) imaging and spectroscopy of air-suspended carbon nanotubes (CNTs) before and after exposure to a brief (20 s) UV/ozone treatment. These spectra show enhanced PL intensities in 10 out of 11 nanotubes that were measured, by as much as 5-fold. This enhancement in the luminescence efficiency is caused by oxygen defects which trap excitons. We also observe an average 3-fold increase in the D-band Raman intensity further indicating the creation of defects. Previous demonstrations of oxygen doping have been carried out on surfactant-coated carbon nanotubes dissolved in solution, thus requiring substantial longer ozone/UV exposure times (∼15 h). Here, the ozone treatment is more efficient because of the surface exposure of the air-suspended CNTs. In addition to enhanced PL intensities, we observe narrowing of the emission linewidth by 3–10 nm. This ability to control and engineer defects in CNTs is important for realizing several optoelectronic applications such as light-emitting diodes and single photon sources.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4964461
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Erratum: “Enhanced photoluminescence in air-suspended carbon nanotubes by oxygen doping” [Appl. Phys. Lett. 109 , 153109 (2016)]
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 1 ( 2017-01-02)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 1 ( 2017-01-02)
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4973289
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Atmospheric pressure plasma jet impinging on fiber arrays: Penetration pattern determined by fiber spacing
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 8 ( 2023-02-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 8 ( 2023-02-20)
    Abstract: Atmospheric pressure cold plasmas have great potential for surface functionalization, and the interaction between the plasmas and fibers is essential to understand the underlying physics. In this Letter, the penetration pattern and mechanism of an atmospheric pressure plasma jet (APPJ) interacting with different spacing fiber scaffolds were studied by both experiment and modeling. The intensified charge coupled device images showed that APPJ induced a radial surface streamer on the windward side of the scaffold and another axial forward streamer on the opposite side. Propagation distance of both the radial and axial streamers diminished as the spacing decreased. Similar trends were predicted by a 2D fluid model. The simulation results indicated that the high electrical field carried by the streamer head in APPJ was allowed to pass through the gap for large spacing scaffold, while it was blocked by high intensity charges at small spacing. Instead, one axial streamer was generated in the latter case. The physical insight on the penetration mechanism of plasma jet interacting with fiber array in this Letter may contribute to improve treatment uniformity of plasma technology.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0139361
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Gelatin-modified 3D printed PGS elastic hierarchical porous scaffold for cartilage regeneration
    AIP Publishing ; 2023
    In:  APL Bioengineering Vol. 7, No. 3 ( 2023-09-01)
    Details
    In: APL Bioengineering, AIP Publishing, Vol. 7, No. 3 ( 2023-09-01)
    Abstract: Regenerative cartilage replacements are increasingly required in clinical settings for various defect repairs, including bronchial cartilage deficiency, articular cartilage injury, and microtia reconstruction. Poly (glycerol sebacate) (PGS) is a widely used bioelastomer that has been developed for various regenerative medicine applications because of its excellent elasticity, biodegradability, and biocompatibility. However, because of inadequate active groups, strong hydrophobicity, and limited ink extrusion accuracy, 3D printed PGS scaffolds may cause insufficient bioactivity, inefficient cell inoculation, and inconsistent cellular composition, which seriously hinders its further cartilage regenerative application. Here, we combined 3D printed PGS frameworks with an encapsulated gelatin hydrogel to fabricate a PGS@Gel composite scaffold. PGS@Gel scaffolds have a controllable porous microstructure, with suitable pore sizes and enhanced hydrophilia, which could significantly promote the cells' penetration and adhesion for efficient chondrocyte inoculation. Furthermore, the outstanding elasticity and fatigue durability of the PGS framework enabled the regenerated cartilage built by the PGS@Gel scaffolds to resist the dynamic in vivo environment and maintain its original morphology. Importantly, PGS@Gel scaffolds increased the rate of cartilage regeneration concurrent with scaffold degradation. The scaffold was gradually degraded and integrated to form uniform, dense, and mature regenerated cartilage tissue with little scaffold residue.
    Type of Medium: Online Resource
    ISSN: 2473-2877
    URL: Article
    DOI: 10.1063/5.0152151
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2916708-5
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