| 1. |
- Ali, Akbar, et al.
(författare)
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Silver-chitosan nanobiocomposite as urea biosensor
- 2014
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Ingår i: Optoelectronics and Advanced Materials Rapid Communications. - : NATL INST OPTOELECTRONICS. - 1842-6573 .- 2065-3824. ; 8:11-12, s. 1238-1242
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Tidskriftsartikel (refereegranskat)abstract
- Silver nanoparticles (Ag NPs) were synthesized by aqueous chemical growth technique. The above mentioned synthesized materials were characterized by applying scanning electron microscope (SEM) and X-ray diffraction for confirmation of morphological analysis, compositional purity, and crystalline property and emission characteristics as well. In order to fabricate the urea biosensor (potentiometric), a solution of deionized water and chitosan was prepared having Ag NPs. The said solution was dropped on the glass fiber filter having diameter of 2 cm. A wire of copper having thickness of approximately 500 pm was used for the voltage signal to pull out from the said working nanoparticles (NPs). To improve the strength, sensitivity and the quality of the potentiometric urea biosensor, a specific functional surface of Ag NPs was attained by electrostatic restrained of an enzyme (urease) onto the chitosan-Ag (a nanobiocomposite). The potentiometric reaction was measured via electrochemical detection technique. The potentiometric urea biosensor illustrates significant sensibility at room temperature with approximate to 42 mV as per span. Furthermore, the said biosensor showed an appropriate stable response within 7 sec.
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| 2. |
- Atif, M., et al.
(författare)
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The synthesis and optical characterization of well aligned ZnO nanorods using seed layer of Mn3O4 nanoparticles
- 2014
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Ingår i: Optoelectronics and Advanced Materials Rapid Communications. - : National Institute of Optoelectronics.. - 1842-6573 .- 2065-3824. ; 8:7-8, s. 643-646
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Tidskriftsartikel (refereegranskat)abstract
- In this study, vertically aligned ZnO nanorods were fabricated by hydrothermal growth method using manganese oxide Mn3O4 nanoparticles as a seed layer. X-ray diffraction and Raman studies have shown the nano meter size of Mn3O4 nanoparticles. ZnO nanorods were characterized by field emission scanning electron microscopy and X-ray diffraction techniques. The prepared ZnO nanorods are highly dense, uniform and verily aligned and possess good crystal quality. Photoluminescence analysis has demonstrated that the ZnO nanorods exhibit deep level emission in green region due to oxygen vacancy related emission and the orange/red region is resulted due to interstitial oxygen defects related emission. This method for the fabrication of well aligned ZnO nanorods can be adapted for the development of optoelectronic devices.
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| 3. |
- Xu, Tianhua, et al.
(författare)
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Dynamic physical layer equalization in optical communication networks
- 2018
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Ingår i: Optoelectronics and Advanced Materials Rapid Communications. - : NATL INST OPTOELECTRONICS. - 1842-6573 .- 2065-3824. ; 12:5-6, s. 292-298
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Tidskriftsartikel (refereegranskat)abstract
- In optical transport networks, signal lightpaths between two terminal nodes can be different due to current network conditions. Thus the transmission distance and accumulated dispersion in the lightpath cannot be predicted. Therefore, the adaptive compensation of dynamic dispersion is necessary in such networks to enable flexible routing and switching. In this paper, we present a detailed analysis on the adaptive dispersion compensation using the least-mean-square (LMS) algorithm in coherent optical communication networks. It is found that the variable-step-size LMS equalizer can achieve the same performance with a lower complexity, compared to the traditional LMS algorithm. © 2018, National Institute of Optoelectronics. All rights reserved.
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| 4. |
- Zheng, Zhijia, et al.
(författare)
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Photoluminescence properties of ZnO:Al films deposited on flexible PET substrate by RF reactive magnetron sputtering
- 2013
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Ingår i: Optoelectronics and Advanced Materials Rapid Communications. - 1842-6573 .- 2065-3824. ; 7:9-10, s. 676-679
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Tidskriftsartikel (refereegranskat)abstract
- Aluminium-doped ZnO (AZO) thin films have been deposited on flexible polyethylene terephthalate (PET) substrate by RF reactive magnetron sputtering process at low substrate temperature (room -100 degrees C), and their photoluminescence (PL) behavior at room temperature and the influence of O-2:Ar ratio, substrate temperature, and deposition time were investigated. The strong near band-edge UV emission and the weak blue emission were observed, while the defect-related deep-level green emission was nearly absent, indicating that high optical quality AZO films, grown on flexible PET substrate, were obtained using the RF reactive magnetron sputtering technique. The origin of the emissions is discussed.
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| 5. |
- Li, W., et al.
(författare)
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Symmetrical acceptor-donor-acceptor type benzodithiophene based organic semiconductors for solution processed bulk heterojunction solar cells: Optimization of open-circuit photovoltage with long alkyl group
- 2017
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Ingår i: Optoelectronics and Advanced Materials, Rapid Communications. - 1842-6573. ; 11:11-12, s. 659-664
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Tidskriftsartikel (refereegranskat)abstract
- Symmetrical acceptor-donor-acceptor type benzodithiophene cored organic semiconductor with cyclopentadithiophene as π bridge, rhodanine as end group was synthesized. Their optical, electrochemical properties and photovoltaic performance acting as donor material in solution processed bulk heterojunction (BHJ) organic solar cells were investigated systematically. Theory calculation study was performed using density functional (DFT) and TD-DFT. WS-53 exhibited an ideal absorption profile in chloroform, with a theory voltage of 1.17 V for WS-53/ PC71BM based BHJ solar cells. Under annealing treatment at 80ºC, an overall power conversion efficiency of 1.04% was obtained with photocurrent density of 4.25 mA cm-2 and voltage of 0.94 V. © 2017, National Institute of Optoelectronics. All rights reserved.
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